updated readme

clean up for porting - move platform specific stuff into outer project
makefile correction
156 changed files with 3112 additions and 11067 deletions
--- a/FreeRTOSConfig.h
+++ b/FreeRTOSConfig.h
@ -90,6 +90,7 @@
 #if defined(__ICCARM__) || defined(__CC_ARM) || defined(__GNUC__)
    #include <stdint.h>
    #include "main.h"
+    #include "plat_config.h"
    #include "plat_compat.h"
 extern uint32_t SystemCoreClock;
 #endif
@ -109,7 +110,6 @@ extern uint32_t SystemCoreClock;
 #define configQUEUE_REGISTRY_SIZE                0
 #define configCHECK_FOR_STACK_OVERFLOW           2
 #define configENABLE_BACKWARD_COMPATIBILITY      0
-#define configUSE_COUNTING_SEMAPHORES            1

 #define configUSE_TIMERS                         0
 #define configTIMER_TASK_PRIORITY                TSK_TIMERS_PRIO // above normal
@ -135,34 +135,11 @@ to exclude the API function. */

 ///* Cortex-M specific definitions. */

-#if defined(GEX_PLAT_F103_BLUEPILL) || defined(GEX_PLAT_F303_DISCOVERY) \
-    || defined(GEX_PLAT_F407_DISCOVERY)
-    // This is for F103+
-
-    /* The lowest interrupt priority that can be used in a call to a "set priority"
-    function. */
-    #define configLIBRARY_LOWEST_INTERRUPT_PRIORITY   15
-
-    #define configPRIO_BITS         4
-
-    /* The highest interrupt priority that can be used by any interrupt service
-    routine that makes calls to interrupt safe FreeRTOS API functions.  DO NOT CALL
-    INTERRUPT SAFE FREERTOS API FUNCTIONS FROM ANY INTERRUPT THAT HAS A HIGHER
-    PRIORITY THAN THIS! (higher priorities are lower numeric values. */
-    #define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 5
-
-    #define configUSE_PORT_OPTIMISED_TASK_SELECTION 1
-#elif defined(GEX_PLAT_F072_DISCOVERY)
-    // This is for F072
-    #define configLIBRARY_LOWEST_INTERRUPT_PRIORITY   3
-    #define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 1
-
-    #define configPRIO_BITS         2
-
-    #define configUSE_PORT_OPTIMISED_TASK_SELECTION 0
-#else
-    #error "BAD PLATFORM!!"
-#endif
+// These are defined in plat_compat.h:
+#define configLIBRARY_LOWEST_INTERRUPT_PRIORITY  PLAT_FREERTOS_LOWEST_INTERRUPT_PRIORITY
+#define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY  PLAT_FREERTOS_MAX_SYSCALL_INTERRUPT_PRIORITY
+#define configPRIO_BITS  PLAT_FREERTOS_PRIO_BITS
+#define configUSE_PORT_OPTIMISED_TASK_SELECTION  PLAT_FREERTOS_USE_PORT_OPTIMISED_TASK_SELECTION

 /* Interrupt priorities used by the kernel port layer itself.  These are generic
 to all Cortex-M ports, and do not rely on any particular library functions. */
--- a/LICENSE.txt
+++ b/LICENSE.txt
@ -0,0 +1,373 @@
+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+    means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+    means
+
+    (a) that the initial Contributor has attached the notice described
+        in Exhibit B to the Covered Software; or
+
+    (b) that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the
+        terms of a Secondary License.
+
+1.6. "Executable Form"
+    means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in
+    a separate file or files, that is not Covered Software.
+
+1.8. "License"
+    means this document.
+
+1.9. "Licensable"
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+1.10. "Modifications"
+    means any of the following:
+
+    (a) any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered
+        Software; or
+
+    (b) any new file in Source Code Form that contains any Covered
+        Software.
+
+1.11. "Patent Claims" of a Contributor
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+1.12. "Secondary License"
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+1.13. "Source Code Form"
+    means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, "You" includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, "control" means (a) the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or (b) ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+    or
+
+(b) for infringements caused by: (i) Your and any other third party's
+    modifications of Covered Software, or (ii) the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+*                                                                      *
+*  6. Disclaimer of Warranty                                           *
+*  -------------------------                                           *
+*                                                                      *
+*  Covered Software is provided under this License on an "as is"       *
+*  basis, without warranty of any kind, either expressed, implied, or  *
+*  statutory, including, without limitation, warranties that the       *
+*  Covered Software is free of defects, merchantable, fit for a        *
+*  particular purpose or non-infringing. The entire risk as to the     *
+*  quality and performance of the Covered Software is with You.        *
+*  Should any Covered Software prove defective in any respect, You     *
+*  (not any Contributor) assume the cost of any necessary servicing,   *
+*  repair, or correction. This disclaimer of warranty constitutes an   *
+*  essential part of this License. No use of any Covered Software is   *
+*  authorized under this License except under this disclaimer.         *
+*                                                                      *
+************************************************************************
+
+************************************************************************
+*                                                                      *
+*  7. Limitation of Liability                                          *
+*  --------------------------                                          *
+*                                                                      *
+*  Under no circumstances and under no legal theory, whether tort      *
+*  (including negligence), contract, or otherwise, shall any           *
+*  Contributor, or anyone who distributes Covered Software as          *
+*  permitted above, be liable to You for any direct, indirect,         *
+*  special, incidental, or consequential damages of any character      *
+*  including, without limitation, damages for lost profits, loss of    *
+*  goodwill, work stoppage, computer failure or malfunction, or any    *
+*  and all other commercial damages or losses, even if such party      *
+*  shall have been informed of the possibility of such damages. This   *
+*  limitation of liability shall not apply to liability for death or   *
+*  personal injury resulting from such party's negligence to the       *
+*  extent applicable law prohibits such limitation. Some               *
+*  jurisdictions do not allow the exclusion or limitation of           *
+*  incidental or consequential damages, so this exclusion and          *
+*  limitation may not apply to You.                                    *
+*                                                                      *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+  This Source Code Form is "Incompatible With Secondary Licenses", as
+  defined by the Mozilla Public License, v. 2.0.
--- a/README.md
+++ b/README.md
@ -0,0 +1,13 @@
+GEX core
+========
+
+This is the (mostly) independent core of the GEX platform. To port GEX to a new STM32 microcontroller,
+add this as a submodule and implement platform specific configuration by following the example of another 
+existing port. Some examples are in the template folder.
+
+License
+-------
+
+- Original GEX source code is provided under the Mozilla Public License v2.0.
+- The VFS driver is adapted from the DAPLink project and remains licensed under the Apache license v2.0.
+- STM32 device drivers etc. provided by ST Microelectronics are licensed under the 3-clause BSD license.
--- a/TinyFrame/TF_Integration.c
+++ b/TinyFrame/TF_Integration.c
@ -4,11 +4,17 @@
 // TinyFrame integration
 //

-#include <USB/usb_device.h>
 #include "platform.h"
 #include "task_main.h"
+#include "comm/messages.h"
+#include "comm/interfaces.h"
+#include "comm/iface_uart.h"
+#include "comm/iface_nordic.h"
+#include "comm/iface_usb.h"
+#include "framework/system_settings.h"

 #include "USB/usbd_cdc_if.h"
+#include "USB/usb_device.h"
 #include "TinyFrame.h"

 extern osSemaphoreId semVcomTxReadyHandle;
@ -16,28 +22,20 @@ extern osMutexId mutTinyFrameTxHandle;

 void TF_WriteImpl(TinyFrame *tf, const uint8_t *buff, uint32_t len)
 {
-    (void) tf;
-#define CHUNK 64 // same as TF_SENDBUF_LEN, so we should always have only one run of the loop
-    int32_t total = (int32_t) len;
-    while (total > 0) {
-        const int32_t mxStatus = osSemaphoreWait(semVcomTxReadyHandle, 100);
-        if (mxStatus != osOK) {
-            TF_Error("Tx stalled");
-            return;
+    if (gActiveComport == COMPORT_USB) {
+        iface_usb_transmit(buff, len);
    }
-
-        const uint16_t chunksize = (uint16_t) MIN(total, CHUNK);
-
-        // this is an attempt to speed it up a little by removing a couple levels of indirection
-        assert_param(HAL_OK == HAL_PCD_EP_Transmit(hUsbDeviceFS.pData, CDC_IN_EP, (uint8_t *) buff, chunksize));
-
-        HAL_PCD_EP_Transmit(hUsbDeviceFS.pData, CDC_IN_EP, (uint8_t *) "AAAAHELLODOLLY123", 17);
-
-//        USBD_LL_Transmit(&hUsbDeviceFS, CDC_IN_EP, (uint8_t *) buff, chunksize);
-//        assert_param(USBD_OK == CDC_Transmit_FS((uint8_t *) buff, chunksize));
-
-        buff += chunksize;
-        total -= chunksize;
+    else if (gActiveComport == COMPORT_USART) {
+        iface_uart_transmit(buff, len);
+    }
+#if SUPPORT_NRF
+    else if (gActiveComport == COMPORT_NORDIC) {
+        iface_nordic_transmit(buff, len);
+    }
+#endif // SUPPORT_NRF
+    else {
+        // TODO other transports
+        trap("not implemented.");
    }
 }

@ -45,10 +43,20 @@ void TF_WriteImpl(TinyFrame *tf, const uint8_t *buff, uint32_t len)
 bool TF_ClaimTx(TinyFrame *tf)
 {
    (void) tf;
-//    assert_param(osThreadGetId() != tskMainHandle);
    assert_param(!inIRQ());

-    assert_param(osOK == osMutexWait(mutTinyFrameTxHandle, 5000));
+    assert_param(pdTRUE == xSemaphoreTake(mutTinyFrameTxHandle, 5000)); // trips the wd
+
+    // The last chunk from some previous frame may still be being transmitted,
+    // wait for it to finish (the semaphore is given in the CDC tx done handler)
+    if (pdTRUE != xSemaphoreTake(semVcomTxReadyHandle, 200)) {
+        TF_Error("Tx stalled in Claim");
+
+        // release the guarding mutex again
+        assert_param(pdTRUE == xSemaphoreGive(mutTinyFrameTxHandle));
+        return false;
+    }
+
    return true;
 }

@ -56,5 +64,7 @@ bool TF_ClaimTx(TinyFrame *tf)
 void TF_ReleaseTx(TinyFrame *tf)
 {
    (void) tf;
-    assert_param(osOK == osMutexRelease(mutTinyFrameTxHandle));
+    assert_param(pdTRUE == xSemaphoreGive(mutTinyFrameTxHandle));
+
+    // the last payload is sent asynchronously
 }
--- a/TinyFrame/TinyFrame.c
+++ b/TinyFrame/TinyFrame.c
@ -870,7 +870,11 @@ static inline uint32_t _TF_FN TF_ComposeTail(uint8_t *outbuff, TF_CKSUM *cksum)
 */
 static bool _TF_FN TF_SendFrame_Begin(TinyFrame *tf, TF_Msg *msg, TF_Listener listener, TF_TICKS timeout)
 {
-    TF_TRY(TF_ClaimTx(tf));
+    bool suc = TF_ClaimTx(tf);
+    if (!suc) {
+        TF_Error("TF lock not free");
+        return false;
+    }

    tf->tx_pos = (uint32_t) TF_ComposeHead(tf, tf->sendbuf, msg); // frame ID is incremented here if it's not a response
    tf->tx_len = msg->len;
@ -1031,10 +1035,10 @@ bool _TF_FN TF_Query_Multipart(TinyFrame *tf, TF_Msg *msg, TF_Listener listener,
    return TF_Query(tf, msg, listener, timeout);
 }

-void _TF_FN TF_Respond_Multipart(TinyFrame *tf, TF_Msg *msg)
+bool _TF_FN TF_Respond_Multipart(TinyFrame *tf, TF_Msg *msg)
 {
    msg->data = NULL;
-    TF_Respond(tf, msg);
+    return TF_Respond(tf, msg);
 }

 void _TF_FN TF_Multipart_Payload(TinyFrame *tf, const uint8_t *buff, uint32_t length)
--- a/TinyFrame/TinyFrame.h
+++ b/TinyFrame/TinyFrame.h
@ -369,7 +369,7 @@ bool TF_Query_Multipart(TinyFrame *tf, TF_Msg *msg, TF_Listener listener, TF_TIC
 * TF_Respond() with multipart payload.
 * msg.data is ignored and set to NULL
 */
-void TF_Respond_Multipart(TinyFrame *tf, TF_Msg *msg);
+bool TF_Respond_Multipart(TinyFrame *tf, TF_Msg *msg);

 /**
 * Send the payload for a started multipart frame. This can be called multiple times
--- a/USB/README.TXT
+++ b/USB/README.TXT
@ -17,3 +17,15 @@ and processed by the message queue thread. This makes it possible to query hardw
 also makes it possible to wait on a binary semaphore when sending data back to host. The
 semaphore is set from the CDC TxComplete callback and taken by the TinyFrame write
 function, serving as a form of flow control.
+
+--------------------------------------------
+
+COMM API:
+
+GEX supports alternate command interfaces.
+
+The active interface is set in the global variable gActiveComport
+Due to special init procedures, the com_switch_transfer() function must be called to change it.
+
+The TX function is defined in TF_Integration.c and any RX'd data is sent through rxQuePostMsg()
+
--- a/USB/STM32_USB_Device_Library/Class/MSC_CDC/usbd_msc_cdc.c
+++ b/USB/STM32_USB_Device_Library/Class/MSC_CDC/usbd_msc_cdc.c
@ -25,8 +25,8 @@ __ALIGN_BEGIN uint8_t USBD_MSC_CDC_CfgFSDesc[USBD_MSC_CDC_CONFIG_DESC_SIZ]  __AL
        3,  /* bNumInterfaces - 1 MSC + 2 composite CDC ACM */
        0x01,   /* bConfigurationValue: */
        0,   /* iConfiguration: - string descriptor */
-        0xC0,   /* bmAttributes: - self powered */
-        150,   /* MaxPower 300 mA */
+        0x80,   /* bmAttributes: - bus powered */
+        250,   /* MaxPower 500 mA */

            /********************  Mass Storage interface ********************/
 /*9*/       0x09,   /* bLength: Interface Descriptor size */
@ -63,7 +63,7 @@ __ALIGN_BEGIN uint8_t USBD_MSC_CDC_CfgFSDesc[USBD_MSC_CDC_CONFIG_DESC_SIZ]  __AL
            0x02, /* bInterfaceCount */
            0x02, /* bFunctionClass */  // #36
            0x02, /* bFunctionSubClass (ACM) */
-            0x01, /* bFunctionProtocol (AT-COMMANDS) */
+            0x01, /* bFunctionProtocol (AT-COMMANDS - we don't implement this but it's a good default) */
            0x05, /* iFunction: string descriptor */

            /********************** ACM interface **********************/
@ -131,7 +131,7 @@ __ALIGN_BEGIN uint8_t USBD_MSC_CDC_CfgFSDesc[USBD_MSC_CDC_CONFIG_DESC_SIZ]  __AL
                USB_DESC_TYPE_ENDPOINT,      /* bDescriptorType: Endpoint */
                CDC_OUT_EP,                        /* bEndpointAddress */
                0x02,                              /* bmAttributes: Bulk */
-                LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),  /* wMaxPacketSize: TODO 8? */
+                LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),  /* wMaxPacketSize */
                HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),
                0x00,                              /* bInterval: ignore for Bulk transfer */

@ -140,7 +140,7 @@ __ALIGN_BEGIN uint8_t USBD_MSC_CDC_CfgFSDesc[USBD_MSC_CDC_CONFIG_DESC_SIZ]  __AL
                USB_DESC_TYPE_ENDPOINT,      /* bDescriptorType: Endpoint */
                CDC_IN_EP,                         /* bEndpointAddress */
                0x02,                              /* bmAttributes: Bulk */
-                LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),  /* wMaxPacketSize: TODO 16? */
+                LOBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),  /* wMaxPacketSize */
                HIBYTE(CDC_DATA_FS_MAX_PACKET_SIZE),
                0x00                               /* bInterval: ignore for Bulk transfer */
    };
--- a/USB/usbd_cdc_if.c
+++ b/USB/usbd_cdc_if.c
@ -313,10 +313,8 @@ void USBD_CDC_TransmitDone(USBD_HandleTypeDef *pdev)
  assert_param(semVcomTxReadyHandle != NULL);
  assert_param(inIRQ());

-//  if (uxSemaphoreGetCount(semVcomTxReadyHandle) == 2) return;
-
  portBASE_TYPE taskWoken = pdFALSE;
-  assert_param(xSemaphoreGiveFromISR(semVcomTxReadyHandle, &taskWoken) == pdTRUE);
+  assert_param(pdTRUE == xSemaphoreGiveFromISR(semVcomTxReadyHandle, &taskWoken));
  portYIELD_FROM_ISR(taskWoken);
 }
 /* USER CODE END PRIVATE_FUNCTIONS_IMPLEMENTATION */
--- a/USB/usbd_conf.c
+++ b/USB/usbd_conf.c
@ -47,13 +47,12 @@
  ******************************************************************************
 */
 /* Includes ------------------------------------------------------------------*/
-#include <platform/hw_utils.h>
+#include <utils/malloc_safe.h>
 #include "platform.h"
 #include "usbd_def.h"
 #include "usbd_core.h"
 #include "usbd_msc.h"
 #include "usbd_cdc.h"
-#include "utils/malloc_safe.h"
 /* Private typedef -----------------------------------------------------------*/
 /* Private define ------------------------------------------------------------*/
 /* Private macro -------------------------------------------------------------*/
@ -85,13 +84,14 @@ void HAL_PCD_MspInit(PCD_HandleTypeDef* pcdHandle)
    __HAL_RCC_USB_CLK_ENABLE();

    /* Peripheral interrupt init */
-#if defined(GEX_PLAT_F103_BLUEPILL)
+    // TODO convert this to feature flags if possible - avoid tying to particular platforms
+#if GEX_PLAT_F103
    HAL_NVIC_SetPriority(USB_LP_CAN1_RX0_IRQn, 5, 0);
    HAL_NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
-#elif defined(GEX_PLAT_F072_DISCOVERY)
+#elif GEX_PLAT_F072
    HAL_NVIC_SetPriority(USB_IRQn, 3, 0);
    HAL_NVIC_EnableIRQ(USB_IRQn);
-#elif defined(GEX_PLAT_F303_DISCOVERY)
+#elif GEX_PLAT_F303
    // Pins need to be configured here

    /**USB GPIO Configuration
@ -150,11 +150,11 @@ void HAL_PCD_MspDeInit(PCD_HandleTypeDef* pcdHandle)
    __HAL_RCC_USB_CLK_DISABLE();

    /* Peripheral interrupt Deinit*/
-#if defined(GEX_PLAT_F103_BLUEPILL)
+#if GEX_PLAT_F103
    HAL_NVIC_DisableIRQ(USB_LP_CAN1_RX0_IRQn);
-#elif defined(GEX_PLAT_F072_DISCOVERY)
+#elif GEX_PLAT_F072
    HAL_NVIC_DisableIRQ(USB_IRQn);
-#elif defined(GEX_PLAT_F303_DISCOVERY)
+#elif GEX_PLAT_F303
    HAL_NVIC_DisableIRQ(USB_LP_CAN_RX0_IRQn);
 #else
  #error "BAD PLATFORM"
@ -336,9 +336,6 @@ void HAL_PCD_DisconnectCallback(PCD_HandleTypeDef *hpcd)
  * @param  pdev: Device handle
  * @retval USBD Status
  */
-
-extern void PCD_WritePMA(USB_TypeDef  *USBx, uint8_t *pbUsrBuf, uint16_t wPMABufAddr, uint16_t wNBytes);
-
 USBD_StatusTypeDef  USBD_LL_Init (USBD_HandleTypeDef *pdev)
 {
 #if PLAT_USB_OTGFS
@ -401,27 +398,12 @@ USBD_StatusTypeDef  USBD_LL_Init (USBD_HandleTypeDef *pdev)
  HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , MSC_EPOUT_ADDR , PCD_SNG_BUF, ptr += 64); // 64

  // CDC endpoints, EP2 two-way and EP3 in-only
-    uint32_t buf1addr, buf2addr;
-
-    buf1addr = (ptr += 64);
-    buf2addr = (ptr += 64);
-
-    uint32_t addr_begin = buf1addr;
-  HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , CDC_IN_EP , PCD_DBL_BUF, buf1addr | (buf2addr << 16)); // 64
-
-    buf1addr = (ptr += 64);
-    buf2addr = (ptr += 64);
-  HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , CDC_OUT_EP , PCD_DBL_BUF, buf1addr | (buf2addr << 16)); // 64
-
+  HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , CDC_IN_EP , PCD_SNG_BUF, ptr += 64); // 64
+  HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , CDC_OUT_EP , PCD_SNG_BUF, ptr += 64); // 64
  HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , CDC_CMD_EP , PCD_SNG_BUF, ptr += 16); // 16
  (void)ptr;
 #endif

-    const uint8_t buf[256] = {};
-    PCD_WritePMA(((PCD_HandleTypeDef*)pdev->pData)->Instance, (uint8_t *) &buf[0],  (uint16_t) addr_begin, 256);
-
-  hw_configure_sparse_pins('B', 0b111, NULL, LL_GPIO_MODE_OUTPUT, LL_GPIO_OUTPUT_PUSHPULL);
-
  return USBD_OK;
 }

--- a/USB/usbd_conf.h
+++ b/USB/usbd_conf.h
@ -99,7 +99,7 @@

 #define CDC_CUSTOM_EPS
 #define CDC_IN_EP                    0x82  /* EP1 for data IN */
-#define CDC_OUT_EP                   0x04  /* EP1 for data OUT */
+#define CDC_OUT_EP                   0x02  /* EP1 for data OUT */
 #define CDC_CMD_EP                   0x83  /* EP2 for CDC commands */

 /** @defgroup USBD_Exported_Macros
--- a/USB/usbd_desc.c
+++ b/USB/usbd_desc.c
@ -72,11 +72,11 @@
 /** @defgroup USBD_DESC_Private_Defines
  * @{
  */ 
-#define USBD_VID              1155 // TODO choose a VID:PID (eg. via pid.codes - 0x1209)
-#define USBD_PID_FS          22314
+#define USBD_VID             0x1209
+#define USBD_PID_FS          0x4c60
 #define USBD_LANGID_NUM       1033
 #define USBD_MANUFACTURER_STRING     "MightyPork"
-#define USBD_PRODUCT_STRING_FS       "GEX"
+#define USBD_PRODUCT_STRING_FS       "GEX USB module"
 #define USBD_VERSION_NUM             0x0001 // 0xMMmp
 //#define USBD_SERIALNUMBER_STRING_FS  "00000000001A"
 //#define USBD_CONFIGURATION_STRING_FS "MSC Config"
--- a/USB/usbd_storage_if.c
+++ b/USB/usbd_storage_if.c
@ -186,7 +186,7 @@ USBD_StorageTypeDef USBD_Storage_Interface_fops_FS =
 int8_t STORAGE_Init_FS (uint8_t lun)
 {
  /* USER CODE BEGIN 2 */
-    dbg("Plug In");
+  dbg("MSC init request");
  vfs_mngr_fs_enable(1);
  return (USBD_OK);
  /* USER CODE END 2 */ 
--- a/comm/event_reports.h
+++ b/comm/event_reports.h
@ -2,8 +2,8 @@
 // Created by MightyPork on 2018/01/27.
 //

-#ifndef GEX_F072_EVENT_REPORTS_H
-#define GEX_F072_EVENT_REPORTS_H
+#ifndef GEX_CORE_EVENT_REPORTS_H
+#define GEX_CORE_EVENT_REPORTS_H

 #ifndef GEX_MESSAGES_H
 #error "Include messages.h instead!"
@ -31,4 +31,4 @@ void EventReport_Data(const uint8_t *buff, uint16_t len);
 void EventReport_PB(PayloadBuilder *pb);
 void EventReport_End(void);

-#endif //GEX_F072_EVENT_REPORTS_H
+#endif //GEX_CORE_EVENT_REPORTS_H
--- a/comm/iface_nordic.c
+++ b/comm/iface_nordic.c
@ -0,0 +1,192 @@
+//
+// Created by MightyPork on 2018/04/06.
+//
+
+#include "platform.h"
+#if SUPPORT_NRF
+
+#include "iface_nordic.h"
+#include "nrf_pins.h"
+#include "resources.h"
+#include "hw_utils.h"
+#include "nrf.h"
+#include "unit_base.h"
+#include "system_settings.h"
+#include "utils/hexdump.h"
+
+
+extern osSemaphoreId semVcomTxReadyHandle;
+
+#define RX_PIPE_NUM 0
+
+void iface_nordic_claim_resources(void)
+{
+    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, NRF_R_SPI));
+    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, NRF_R_CE));
+    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, NRF_R_NSS));
+    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, NRF_R_IRQ));
+    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, NRF_R_MISO));
+    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, NRF_R_MOSI));
+    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, NRF_R_SCK));
+
+    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, R_EXTI0+NRF_EXTI_LINENUM));
+}
+
+void iface_nordic_free_resources(void)
+{
+    rsc_free(&UNIT_SYSTEM, NRF_R_SPI);
+    rsc_free(&UNIT_SYSTEM, NRF_R_CE);
+    rsc_free(&UNIT_SYSTEM, NRF_R_NSS);
+    rsc_free(&UNIT_SYSTEM, NRF_R_IRQ);
+    rsc_free(&UNIT_SYSTEM, NRF_R_MISO);
+    rsc_free(&UNIT_SYSTEM, NRF_R_MOSI);
+    rsc_free(&UNIT_SYSTEM, NRF_R_SCK);
+
+    rsc_free(&UNIT_SYSTEM, R_EXTI0+NRF_EXTI_LINENUM);
+}
+
+static uint8_t rx_buffer[32];
+
+static void NrfIrqHandler(void *arg)
+{
+    LL_EXTI_ClearFlag_0_31(LL_EXTI_LINES[NRF_EXTI_LINENUM]);
+    dbg_nrf("[EXTI] ---");
+
+    while (NRF_IsRxPacket()) {
+        uint8_t pipenum;
+        uint8_t count = NRF_ReceivePacket(rx_buffer, &pipenum);
+        if (count > 0) {
+            dbg_nrf("NRF RX %d bytes", (int) count);
+            rxQuePostMsg(rx_buffer, count);
+        }
+        else {
+            dbg("IRQ but no Rx");
+        }
+    }
+
+    dbg_nrf("--- end [EXTI]");
+}
+
+bool iface_nordic_init(void)
+{
+    dbg("Setting up Nordic...");
+
+    hw_periph_clock_enable(NRF_SPI);
+
+    // SPI pins
+    assert_param(E_SUCCESS == hw_configure_gpiorsc_af(NRF_R_SCK, NRF_SCK_AF));
+    assert_param(E_SUCCESS == hw_configure_gpiorsc_af(NRF_R_MOSI, NRF_MOSI_AF));
+    assert_param(E_SUCCESS == hw_configure_gpiorsc_af(NRF_R_MISO, NRF_MISO_AF));
+
+    // Manual pins
+    LL_GPIO_SetPinMode(NRF_NSS_GPIO_Port, NRF_NSS_Pin, LL_GPIO_MODE_OUTPUT);
+    LL_GPIO_SetPinMode(NRF_CE_GPIO_Port, NRF_CE_Pin, LL_GPIO_MODE_OUTPUT);
+    LL_GPIO_SetPinMode(NRF_RST_GPIO_Port, NRF_RST_Pin, LL_GPIO_MODE_OUTPUT);
+    LL_GPIO_SetPinMode(NRF_IRQ_GPIO_Port, NRF_IRQ_Pin, LL_GPIO_MODE_INPUT);
+
+    // set up SPI
+    LL_SPI_Disable(NRF_SPI);
+    {
+        LL_SPI_SetBaudRatePrescaler(NRF_SPI, LL_SPI_BAUDRATEPRESCALER_DIV32);
+        //LL_SPI_BAUDRATEPRESCALER_DIV8
+
+        LL_SPI_SetClockPolarity(NRF_SPI,     LL_SPI_POLARITY_LOW);
+        LL_SPI_SetClockPhase(NRF_SPI,        LL_SPI_PHASE_1EDGE);
+        LL_SPI_SetTransferDirection(NRF_SPI, LL_SPI_FULL_DUPLEX);
+        LL_SPI_SetTransferBitOrder(NRF_SPI,  LL_SPI_MSB_FIRST);
+
+        LL_SPI_SetNSSMode(NRF_SPI, LL_SPI_NSS_SOFT);
+        LL_SPI_SetDataWidth(NRF_SPI, LL_SPI_DATAWIDTH_8BIT);
+        LL_SPI_SetRxFIFOThreshold(NRF_SPI, LL_SPI_RX_FIFO_TH_QUARTER); // trigger RXNE on 1 byte
+
+        LL_SPI_SetMode(NRF_SPI, LL_SPI_MODE_MASTER);
+    }
+    LL_SPI_Enable(NRF_SPI);
+
+    // reset the radio / enable its power supply
+    NRF_Reset(1);
+    LL_mDelay(5);
+    NRF_Reset(0);
+
+    dbg("configure nrf module");
+
+    // Now configure the radio
+    if (!NRF_Init(NRF_SPEED_2M)) {// TODO configurable speed - also maybe better to use slower
+        dbg("--- NRF not present!");
+        return false;
+    }
+
+    NRF_SetChannel(SystemSettings.nrf_channel);
+    NRF_SetBaseAddress(SystemSettings.nrf_network);
+    NRF_SetRxAddress(RX_PIPE_NUM, SystemSettings.nrf_address);
+    NRF_EnablePipe(RX_PIPE_NUM);
+    NRF_ModeRX();
+
+    dbg("enable exti");
+    // EXTI
+    LL_EXTI_EnableIT_0_31(LL_EXTI_LINES[NRF_EXTI_LINENUM]);
+    LL_EXTI_EnableFallingTrig_0_31(LL_EXTI_LINES[NRF_EXTI_LINENUM]);
+    LL_SYSCFG_SetEXTISource(NRF_SYSCFG_EXTI_PORT, LL_SYSCFG_EXTI_LINES[NRF_EXTI_LINENUM]);
+    irqd_attach(EXTIS[NRF_EXTI_LINENUM], NrfIrqHandler, NULL);
+    // TODO increase priority in NVIC?
+
+    dbg("nrf setup done");
+    return true;
+}
+
+void iface_nordic_deinit(void)
+{
+    LL_EXTI_DisableIT_0_31(LL_EXTI_LINES[NRF_EXTI_LINENUM]);
+    LL_EXTI_DisableFallingTrig_0_31(LL_EXTI_LINES[NRF_EXTI_LINENUM]);
+    irqd_detach(EXTIS[NRF_EXTI_LINENUM], NrfIrqHandler);
+    hw_periph_clock_disable(NRF_SPI);
+
+    hw_deinit_pin_rsc(NRF_R_SCK);
+    hw_deinit_pin_rsc(NRF_R_MOSI);
+    hw_deinit_pin_rsc(NRF_R_MISO);
+    hw_deinit_pin_rsc(NRF_R_NSS);
+    hw_deinit_pin_rsc(NRF_R_CE);
+    hw_deinit_pin_rsc(NRF_R_IRQ);
+    hw_deinit_pin_rsc(NRF_R_RST);
+}
+
+// FIXME
+#define MAX_RETRY 5
+
+void iface_nordic_transmit(const uint8_t *buff, uint32_t len)
+{
+    bool suc = false;
+    while (len > 0) {
+        uint8_t chunk = (uint8_t) MIN(32, len);
+
+        uint16_t delay = 1;
+        //hexDump("Tx chunk", buff, chunk);
+        for (int i = 0; i < MAX_RETRY; i++) {
+            suc = NRF_SendPacket(RX_PIPE_NUM, buff, chunk); // use the pipe to retrieve the address
+            if (!suc) {
+                vTaskDelay(delay);
+                delay *= 2; // longer delay next time
+            } else {
+                break;
+            }
+        }
+
+        if (!suc) {
+            break;
+        }
+
+        buff += chunk;
+        len -= chunk;
+    }
+
+    if (suc) {
+        dbg_nrf("+ NRF Tx OK!");
+    } else {
+        dbg("- NRF sending failed");
+    }
+
+    // give when it's done
+    xSemaphoreGive(semVcomTxReadyHandle); // similar to how it's done in USB - this is called in the Tx Done handler
+}
+
+#endif // SUPPORT_NRF
--- a/comm/iface_nordic.h
+++ b/comm/iface_nordic.h
@ -0,0 +1,23 @@
+//
+// Created by MightyPork on 2018/04/06.
+//
+
+#ifndef GEX_CORE_IFACE_NORDIC_H
+#define GEX_CORE_IFACE_NORDIC_H
+
+#include "platform.h"
+#if SUPPORT_NRF
+
+void iface_nordic_claim_resources(void);
+
+void iface_nordic_free_resources(void);
+
+void iface_nordic_deinit(void);
+
+bool iface_nordic_init(void);
+
+void iface_nordic_transmit(const uint8_t *buff, uint32_t len);
+
+#endif // SUPPORT_NRF
+
+#endif //GEX_CORE_IFACE_NORDIC_H
--- a/comm/iface_uart.c
+++ b/comm/iface_uart.c
@ -0,0 +1,105 @@
+//
+// Created by MightyPork on 2018/04/06.
+//
+
+#include "platform.h"
+#include "iface_uart.h"
+#include "resources.h"
+#include "hw_utils.h"
+#include "irq_dispatcher.h"
+#include "task_msg.h"
+#include "system_settings.h"
+
+extern osSemaphoreId semVcomTxReadyHandle;
+
+static uint32_t usart_rxi = 0;
+static uint8_t usart_rx_buffer[MSG_QUE_SLOT_SIZE];
+static uint32_t last_rx_time = 0;
+
+void iface_uart_claim_resources(void)
+{
+    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, R_USART2));
+    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, R_PA2));
+    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, R_PA3));
+}
+
+void iface_uart_free_resources(void)
+{
+    rsc_free(&UNIT_SYSTEM, R_USART2);
+    rsc_free(&UNIT_SYSTEM, R_PA2);
+    rsc_free(&UNIT_SYSTEM, R_PA3);
+}
+
+/** Handler for the USART transport */
+static void com_UsartIrqHandler(void *arg)
+{
+    (void)arg;
+    if (LL_USART_IsActiveFlag_RXNE(USART2)) {
+        vPortEnterCritical();
+        {
+            usart_rx_buffer[usart_rxi++] = LL_USART_ReceiveData8(USART2);
+            if (usart_rxi == MSG_QUE_SLOT_SIZE) {
+                rxQuePostMsg(usart_rx_buffer, MSG_QUE_SLOT_SIZE); // avoid it happening in the irq
+                usart_rxi = 0;
+            }
+            last_rx_time = HAL_GetTick();
+        }
+        vPortExitCritical();
+    }
+}
+
+/** this is called from the hal tick irq */
+void com_iface_flush_buffer(void)
+{
+    if (usart_rxi > 0 && (HAL_GetTick()-last_rx_time)>=2) {
+        vPortEnterCritical();
+        {
+            rxQuePostMsg(usart_rx_buffer, usart_rxi);
+            usart_rxi = 0;
+        }
+        vPortExitCritical();
+    }
+}
+
+bool iface_uart_init(void)
+{
+    dbg("Setting up UART transfer");
+    assert_param(E_SUCCESS == hw_configure_gpiorsc_af(R_PA2, LL_GPIO_AF_1));
+    assert_param(E_SUCCESS == hw_configure_gpiorsc_af(R_PA3, LL_GPIO_AF_1));
+
+    __HAL_RCC_USART2_CLK_ENABLE();
+    __HAL_RCC_USART2_FORCE_RESET();
+    __HAL_RCC_USART2_RELEASE_RESET();
+
+    LL_USART_Disable(USART2);
+
+    LL_USART_SetBaudRate(USART2, PLAT_APB1_HZ, LL_USART_OVERSAMPLING_16, SystemSettings.comm_uart_baud);
+    dbg("baud = %d", (int)SystemSettings.comm_uart_baud);
+
+    irqd_attach(USART2, com_UsartIrqHandler, NULL);
+    LL_USART_EnableIT_RXNE(USART2);
+    LL_USART_SetTransferDirection(USART2, LL_USART_DIRECTION_TX_RX);
+
+    LL_USART_Enable(USART2);
+
+    return true; // always OK (TODO check voltage on Rx if it's 3V3 when idle?)
+}
+
+void iface_uart_deinit(void)
+{
+    // this doesn't normally happen
+    hw_deinit_pin_rsc(R_PA2);
+    hw_deinit_pin_rsc(R_PA3);
+    __HAL_RCC_USART2_CLK_DISABLE();
+    irqd_detach(USART2, com_UsartIrqHandler);
+}
+
+void iface_uart_transmit(const uint8_t *buff, uint32_t len)
+{
+    // TODO rewrite this to use DMA, then wait for the DMA
+    for(uint32_t i=0;i<len;i++) {
+        while(!LL_USART_IsActiveFlag_TXE(USART2));
+        LL_USART_TransmitData8(USART2, buff[i]);
+    }
+    xSemaphoreGive(semVcomTxReadyHandle); // act as if we just finished it and this is perhaps the DMA irq
+}
--- a/comm/iface_uart.h
+++ b/comm/iface_uart.h
@ -0,0 +1,20 @@
+//
+// Created by MightyPork on 2018/04/06.
+//
+
+#ifndef GEX_CORE_IFACE_UART_H
+#define GEX_CORE_IFACE_UART_H
+
+#include "platform.h"
+
+void com_iface_flush_buffer(void);
+
+void iface_uart_deinit(void);
+bool iface_uart_init(void);
+
+void iface_uart_free_resources(void);
+void iface_uart_claim_resources(void);
+
+void iface_uart_transmit(const uint8_t *buff, uint32_t len);
+
+#endif //GEX_CORE_IFACE_UART_H
--- a/comm/iface_usb.c
+++ b/comm/iface_usb.c
@ -0,0 +1,73 @@
+//
+// Created by MightyPork on 2018/04/06.
+//
+
+#include "iface_usb.h"
+#include "TinyFrame.h"
+#include "system_settings.h"
+#include "USB/usb_device.h"
+
+extern osSemaphoreId semVcomTxReadyHandle;
+extern osMutexId mutTinyFrameTxHandle;
+
+bool iface_usb_ready(void)
+{
+    return 0 != (USB->DADDR & USB_DADDR_ADD);
+}
+
+/**
+ * USB transmit implementation
+ *
+ * @param buff - buffer to send (can be longer than the buffers)
+ * @param len - buffer size
+ */
+void iface_usb_transmit(const uint8_t *buff, uint32_t len)
+{
+#if 1
+    const uint32_t real_size = len;
+
+    // Padding to a multiple of 64 bytes - this is supposed to maximize the bulk transfer speed
+    if ((len&0x3F) && !SystemSettings.visible_vcom) { // this corrupts VCOM on Linux for some reason
+        uint32_t pad = (64 - (len&0x3F));
+        memset((void *) (buff + len), 0, pad);
+        len += pad; // padding to a multiple of 64 (size of the endpoint)
+    }
+
+    // We bypass the USBD driver library's overhead by using the HAL function directly
+    assert_param(HAL_OK == HAL_PCD_EP_Transmit(hUsbDeviceFS.pData, CDC_IN_EP, (uint8_t *) buff, len));
+
+    // The buffer is the TF transmit buffer, we can't leave it to work asynchronously because
+    // the next call could modify it before it's been transmitted (in the case of a chunked / multi-part frame)
+
+    // If this is not the last chunk (assuming all but the last use full 512 bytes of the TF buffer), wait now for completion
+    if (real_size == TF_SENDBUF_LEN) {
+        // TODO this seems wrong - investigate
+        if (pdTRUE != xSemaphoreTake(semVcomTxReadyHandle, 100)) {
+            TF_Error("Tx stalled in WriteImpl");
+            return;
+        }
+    }
+#else
+    (void) tf;
+#define CHUNK 64 // size of the USB packet
+    int32_t total = (int32_t) len;
+    while (total > 0) {
+        const int32_t mxStatus = osSemaphoreWait(semVcomTxReadyHandle, 100);
+        if (mxStatus != osOK) {
+            TF_Error("Tx stalled");
+            return;
+        }
+
+        const uint16_t chunksize = (uint16_t) MIN(total, CHUNK);
+
+        // this is an attempt to speed it up a little by removing a couple levels of indirection
+        assert_param(HAL_OK == HAL_PCD_EP_Transmit(hUsbDeviceFS.pData, CDC_IN_EP, (uint8_t *) buff, chunksize));
+
+//        USBD_LL_Transmit(&hUsbDeviceFS, CDC_IN_EP, (uint8_t *) buff, chunksize);
+//        assert_param(USBD_OK == CDC_Transmit_FS((uint8_t *) buff, chunksize));
+
+        buff += chunksize;
+        total -= chunksize;
+    }
+#endif
+}
--- a/comm/iface_usb.h
+++ b/comm/iface_usb.h
@ -0,0 +1,20 @@
+//
+// Created by MightyPork on 2018/04/06.
+//
+
+#ifndef GEX_CORE_IFACE_USB_H
+#define GEX_CORE_IFACE_USB_H
+
+#include "platform.h"
+
+bool iface_usb_ready(void);
+
+/**
+ * USB transmit implementation
+ *
+ * @param buff - buffer to send (can be longer than the buffers)
+ * @param len - buffer size
+ */
+void iface_usb_transmit(const uint8_t *buff, uint32_t len);
+
+#endif //GEX_CORE_IFACE_USB_H
--- a/comm/interfaces.c
+++ b/comm/interfaces.c
@ -0,0 +1,156 @@
+//
+// Created by MightyPork on 2018/03/23.
+//
+
+#include "platform.h"
+#include "usbd_core.h"
+#include "USB/usb_device.h"
+#include "interfaces.h"
+#include "framework/system_settings.h"
+#include "framework/unit.h"
+#include "framework/resources.h"
+#include "platform/hw_utils.h"
+#include "framework/unit_base.h"
+#include "nrf_pins.h"
+#include "iface_uart.h"
+#include "iface_usb.h"
+#include "iface_nordic.h"
+
+// those correspond to the ENUM values
+const char * COMPORT_NAMES[] = {
+    "NONE",
+    "USB",
+    "UART",
+    "NRF",
+    "LORA",
+};
+
+enum ComportSelection gActiveComport = COMPORT_USB; // start with USB so the handlers work correctly initially
+
+static uint32_t last_switch_time = 0; // started with USB
+static bool xfer_verify_done = false;
+
+static bool configure_interface(enum ComportSelection iface);
+
+/** Switch com transfer if the current one doesnt seem to work */
+void com_switch_transfer_if_needed(void)
+{
+    if (xfer_verify_done) return;
+
+    const uint32_t now = HAL_GetTick();
+    const uint32_t elapsed = now - last_switch_time;
+
+    if (gActiveComport == COMPORT_USB) {
+        if (elapsed > 1000) {
+            // USB may or may not work, depending on whether the module is plugged in
+            // or running from a battery/external supply remotely.
+
+            // Check if USB is enumerated
+
+            if (!iface_usb_ready()) {
+                dbg("Not enumerated, assuming USB is dead");
+
+                // Fallback to radio or bare USART
+                do {
+                    if (SystemSettings.use_comm_nordic) {
+                        if (configure_interface(COMPORT_NORDIC)) break;
+                    }
+
+#if 0
+                    if (SystemSettings.use_comm_lora) {
+                        if (configure_interface(COMPORT_LORA)) break;
+                    }
+#endif
+
+                    if (SystemSettings.use_comm_uart) {
+                        // after nordic/lora
+                        if (configure_interface(COMPORT_USART)) break;
+                    }
+
+                    dbg("No alternate com interface configured.");
+                    gActiveComport = COMPORT_NONE;
+                } while (0);
+            } else {
+                dbg("USB got address - OK");
+            }
+
+            xfer_verify_done = true;
+        }
+    }
+}
+
+/** Claim resources that may be needed for alternate transfers */
+void com_claim_resources_for_alt_transfers(void)
+{
+    if (SystemSettings.use_comm_uart) {
+        iface_uart_claim_resources();
+    }
+
+#if SUPPORT_NRF
+    if (SystemSettings.use_comm_nordic) {
+        iface_nordic_claim_resources();
+    }
+#endif // SUPPORT_NRF
+}
+
+/** Release resources allocated for alternate transfers */
+void com_release_resources_for_alt_transfers(void)
+{
+    if (SystemSettings.use_comm_uart) {
+        iface_uart_free_resources();
+    }
+
+#if SUPPORT_NRF
+    if (SystemSettings.use_comm_nordic) {
+        iface_nordic_free_resources();
+    }
+#endif // SUPPORT_NRF
+}
+
+
+static bool configure_interface(enum ComportSelection iface)
+{
+    // Teardown
+    if (gActiveComport == COMPORT_USB) {
+        // simplest USB disabling (XXX needs porting)
+        HAL_PCD_DeInit(&hpcd_USB_FS);
+        __HAL_RCC_USB_CLK_DISABLE();
+    }
+    else if (gActiveComport == COMPORT_USART) {
+        iface_uart_deinit();
+    }
+#if SUPPORT_NRF
+    else if (gActiveComport == COMPORT_NORDIC) {
+        iface_nordic_deinit();
+    }
+#endif // SUPPORT_NRF
+
+
+    gActiveComport = iface;
+
+    // Init
+    if (iface == COMPORT_USB) {
+        trap("illegal"); // this never happens
+        return false;
+    }
+    else if (iface == COMPORT_USART) {
+        return iface_uart_init();
+    }
+#if SUPPORT_NRF
+    else if (iface == COMPORT_NORDIC) {
+        return iface_nordic_init();
+    }
+#endif // SUPPORT_NRF
+#if 0
+    else if (iface == COMPORT_LORA) {
+        // Try to configure nordic
+        dbg("Setting up LoRa transfer");
+        // TODO set up and check LoRa transport
+        dbg("LoRa not impl!");
+        return false;
+    }
+#endif
+    else {
+        trap("Bad iface %d", iface);
+    }
+}
--- a/comm/interfaces.h
+++ b/comm/interfaces.h
@ -0,0 +1,37 @@
+//
+// Created by MightyPork on 2018/03/23.
+//
+
+#ifndef GEX_CORE_COM_INTERFACES_H
+#define GEX_CORE_COM_INTERFACES_H
+
+#include "platform.h"
+
+enum ComportSelection {
+    COMPORT_NONE = 0,
+    COMPORT_USB = 1,
+    COMPORT_USART = 2,
+    COMPORT_NORDIC = 3,
+    COMPORT_LORA = 4,
+};
+
+extern const char * COMPORT_NAMES[];
+
+/**
+ * The currently active communication port
+ */
+extern enum ComportSelection gActiveComport;
+
+/** Switch com transfer if the current one doesnt seem to work */
+void com_switch_transfer_if_needed(void);
+
+/** Claim resources that may be needed for alternate transfers */
+void com_claim_resources_for_alt_transfers(void);
+
+/** Release resources allocated for alternate transfers */
+void com_release_resources_for_alt_transfers(void);
+
+/** Flush the rx buffer */
+void com_iface_flush_buffer(void);
+
+#endif //GEX_CORE_COM_INTERFACES_H
--- a/comm/messages.c
+++ b/comm/messages.c
@ -2,7 +2,6 @@
 // Created by MightyPork on 2017/11/21.
 //

-#include <platform/status_led.h>
 #include "platform.h"
 #include "framework/settings.h"
 #include "utils/ini_parser.h"
@ -11,6 +10,8 @@
 #include "comm/messages.h"
 #include "framework/system_settings.h"
 #include "utils/malloc_safe.h"
+#include "platform/status_led.h"
+#include "interfaces.h"

 static TinyFrame tf_;
 TinyFrame *comm = &tf_;
@ -22,8 +23,9 @@ TinyFrame *comm = &tf_;
 */
 static TF_Result lst_ping(TinyFrame *tf, TF_Msg *msg)
 {
+    dbg("Ping!");
    com_respond_snprintf(msg->frame_id, MSG_SUCCESS,
-                         "GEX v%s on %s", GEX_VERSION, GEX_PLATFORM);
+                         "GEX v%s on %s (%s)", GEX_VERSION, GEX_PLATFORM, COMPORT_NAMES[gActiveComport]);
    return TF_STAY;
 }

@ -58,42 +60,64 @@ static TF_Result lst_list_units(TinyFrame *tf, TF_Msg *msg)

 // ---------------------------------------------------------------------------

-/** Callback for bulk read of the settings file */
-static void settings_bulkread_cb(BulkRead *bulk, uint32_t chunk, uint8_t *buffer)
+/** Callback for bulk read of a settings file */
+static void ini_bulkread_cb(BulkRead *bulk, uint32_t chunk, uint8_t *buffer)
 {
    // clean-up request
    if (buffer == NULL) {
        free_ck(bulk);
        iw_end();
-        dbg("INI read complete.");
        return;
    }

    if (bulk->offset == 0) iw_begin();

    IniWriter iw = iw_init((char *)buffer, bulk->offset, chunk);
-    iw.tag = 1;
+    iw.tag = 1; // indicates this is read via the API (affects some comments)
+
+    uint8_t filenum = (uint8_t) (int) bulk->userdata;
+    
+    if (filenum == 0) {
        settings_build_units_ini(&iw);
+    }
+    else if (filenum == 1) {
+        settings_build_system_ini(&iw);
+    }
 }

 /**
- * Listener: Export INI file via TF
+ * Listener: Export a file via TF
 */
 static TF_Result lst_ini_export(TinyFrame *tf, TF_Msg *msg)
 {
-    dbg("Bulk read INI file");
+//    dbg("Bulk read INI file");

    BulkRead *bulk = malloc_ck(sizeof(BulkRead));
    assert_param(bulk != NULL);

+    uint8_t filenum = 0;
+
+    // if any payload, the first byte defines the file to read
+    // 0 - units
+    // 1 - system
+    // (this is optional for backwards compatibility)
+    if (msg->len > 0) {
+        filenum = msg->data[0];
+    }
+
    bulk->frame_id = msg->frame_id;
+    bulk->read = ini_bulkread_cb;
+    bulk->userdata = (void *) (int)filenum;
+
+    if (filenum == 0) {
        bulk->len = iw_measure_total(settings_build_units_ini, 1);
-    bulk->read = settings_bulkread_cb;
-    bulk->userdata = NULL;
+    }
+    else if (filenum == 1) {
+        bulk->len = iw_measure_total(settings_build_system_ini, 1);
+    }

    bulkread_start(tf, bulk);
    Indicator_Effect(STATUS_DISK_BUSY_SHORT);
-
    return TF_STAY;
 }

@ -114,7 +138,7 @@ static void settings_bulkwrite_cb(BulkWrite *bulk, const uint8_t *chunk, uint32_

        if (bulk->offset > 0) {
            settings_load_ini_end();
-            dbg("INI write complete");
+//            dbg("INI write complete");
        } else {
            dbg("INI write failed");
        }
@ -131,7 +155,7 @@ static void settings_bulkwrite_cb(BulkWrite *bulk, const uint8_t *chunk, uint32_
 */
 static TF_Result lst_ini_import(TinyFrame *tf, TF_Msg *msg)
 {
-    dbg("Bulk write INI file");
+//    dbg("Bulk write INI file");

    BulkWrite *bulk = malloc_ck(sizeof(BulkWrite));
    assert_param(bulk);
@ -142,7 +166,7 @@ static TF_Result lst_ini_import(TinyFrame *tf, TF_Msg *msg)
    PayloadParser pp = pp_start(msg->data, msg->len, NULL);
    uint32_t len = pp_u32(&pp);
    if (!pp.ok) {
-        com_respond_error(msg->frame_id, E_PROTOCOL_BREACH);
+        com_respond_error(msg->frame_id, E_MALFORMED_COMMAND);
        goto done;
    }

@ -151,11 +175,8 @@ static TF_Result lst_ini_import(TinyFrame *tf, TF_Msg *msg)

    settings_load_ini_begin();
    ini_parse_begin(iniparser_cb, NULL);
-
    bulkwrite_start(tf, bulk);
-
    Indicator_Effect(STATUS_DISK_BUSY);
-
 done:
    return TF_STAY;
 }
--- a/comm/msg_bulkread.h
+++ b/comm/msg_bulkread.h
@ -4,8 +4,8 @@
 // Bulk read (providing data for bulk read by the PC)
 //

-#ifndef GEX_F072_MSG_BULKREAD_H
-#define GEX_F072_MSG_BULKREAD_H
+#ifndef GEX_CORE_MSG_BULKREAD_H
+#define GEX_CORE_MSG_BULKREAD_H

 #ifndef GEX_MESSAGES_H
 #error "Include messages.h instead!"
@ -45,4 +45,4 @@ struct bulk_read {
 void bulkread_start(TinyFrame *tf, BulkRead *bulk);


-#endif //GEX_F072_MSG_BULKREAD_H
+#endif //GEX_CORE_MSG_BULKREAD_H
--- a/comm/msg_bulkwrite.h
+++ b/comm/msg_bulkwrite.h
@ -4,8 +4,8 @@
 // Bulk write (receiving bulk write from the PC)
 //

-#ifndef GEX_F072_MSG_BULKWRITE_H
-#define GEX_F072_MSG_BULKWRITE_H
+#ifndef GEX_CORE_MSG_BULKWRITE_H
+#define GEX_CORE_MSG_BULKWRITE_H

 #ifndef GEX_MESSAGES_H
 #error "Include messages.h instead!"
@ -44,4 +44,4 @@ struct bulk_write {
 void bulkwrite_start(TinyFrame *tf, BulkWrite *bulk);


-#endif //GEX_F072_MSG_BULKWRITE_H
+#endif //GEX_CORE_MSG_BULKWRITE_H
--- a/comm/msg_responses.h
+++ b/comm/msg_responses.h
@ -4,8 +4,8 @@
 // Routines for sending TinyFrame responses.
 //

-#ifndef GEX_F072_MSG_RESPONSES_H
-#define GEX_F072_MSG_RESPONSES_H
+#ifndef GEX_CORE_MSG_RESPONSES_H
+#define GEX_CORE_MSG_RESPONSES_H

 #ifndef GEX_MESSAGES_H
 #error "Include messages.h instead!"
@ -109,4 +109,4 @@ void com_respond_u16(TF_ID frame_id, uint16_t d);
 */
 void com_respond_u32(TF_ID frame_id, uint32_t d);

-#endif //GEX_F072_MSG_RESPONSES_H
+#endif //GEX_CORE_MSG_RESPONSES_H
--- a/comm/nrf.c
+++ b/comm/nrf.c
@ -0,0 +1,551 @@
+//
+// Created by MightyPork on 2018/04/02.
+//
+
+#include "platform.h"
+#if SUPPORT_NRF
+
+#include "nrf.h"
+
+/**
+ * Read a register
+ *
+ * @param reg - register number (max 83)
+ * @return register value
+ */
+static uint8_t NRF_ReadRegister(uint8_t reg);
+
+/**
+ * Write a register
+ *
+ * @param reg - register number (max 83)
+ * @param value - register value
+ * @return status register value
+ */
+static uint8_t NRF_WriteRegister(uint8_t reg, uint8_t value);
+
+// Internal use
+static uint8_t NRF_WriteBuffer(uint8_t reg, const uint8_t *pBuf, uint8_t bytes);
+
+static uint8_t NRF_ReadBuffer(uint8_t reg, uint8_t *pBuf, uint8_t bytes);
+
+/**
+ * Set TX address for next frame
+ *
+ * @param SendTo - addr
+ */
+static void NRF_SetTxAddress(uint8_t ToAddr);
+
+//----------------------------------------------------------
+
+/** Tight asm loop */
+#define __asm_loop(cycles) \
+do { \
+    register uint32_t _count asm ("r4") = cycles; \
+    asm volatile( \
+        ".syntax unified\n" \
+        ".thumb\n" \
+        "0:" \
+            "subs %0, #1\n" \
+            "bne 0b\n" \
+        : "+r" (_count)); \
+} while(0)
+
+// 12 for 72 MHz
+#define _delay_us(n) __asm_loop((n)*8)
+
+static inline void CE(bool level) {
+    __asm_loop(1);
+    if (level) LL_GPIO_SetOutputPin(NRF_CE_GPIO_Port, NRF_CE_Pin);
+    else LL_GPIO_ResetOutputPin(NRF_CE_GPIO_Port, NRF_CE_Pin);
+    __asm_loop(1);
+}
+
+static inline void NSS(bool level) {
+    __asm_loop(1);
+    if (level) LL_GPIO_SetOutputPin(NRF_NSS_GPIO_Port, NRF_NSS_Pin);
+    else LL_GPIO_ResetOutputPin(NRF_NSS_GPIO_Port, NRF_NSS_Pin);
+    __asm_loop(1);
+}
+
+static uint8_t spi(uint8_t tx) {
+    while (! LL_SPI_IsActiveFlag_TXE(NRF_SPI));
+    LL_SPI_TransmitData8(NRF_SPI, tx);
+    while (! LL_SPI_IsActiveFlag_RXNE(NRF_SPI));
+    return LL_SPI_ReceiveData8(NRF_SPI);
+}
+
+void NRF_Reset(bool enable_reset)
+{
+    if (enable_reset) {
+        // go HIGH - this closes the PMOS
+        LL_GPIO_SetOutputPin(NRF_RST_GPIO_Port, NRF_RST_Pin);
+    } else {
+        // LOW - open PMOS, enable power
+        LL_GPIO_ResetOutputPin(NRF_RST_GPIO_Port, NRF_RST_Pin);
+    }
+}
+
+//-------
+
+/*
+ * from: http://barefootelectronics.com/NRF24L01.aspx
+ */
+
+#define CMD_READ_REG        0x00  // Read command to register
+#define CMD_WRITE_REG       0x20  // Write command to register
+#define CMD_RD_RX_PLD     0x61  // Read RX payload register address
+#define CMD_WR_TX_PLD     0xA0  // Write TX payload register address
+#define CMD_FLUSH_TX        0xE1  // Flush TX register command
+#define CMD_FLUSH_RX        0xE2  // Flush RX register command
+#define CMD_REUSE_TX_PL     0xE3  // Reuse TX payload register command
+#define CMD_RD_RX_PL_WIDTH    0x60  // Read RX Payload Width
+#define CMD_WR_ACK_PLD   0xA8  // Write ACK payload for Pipe (Add pipe number 0-6)
+#define CMD_WR_TX_PLD_NK  0xB0  // Write ACK payload for not ack
+#define CMD_NOP             0xFF  // No Operation, might be used to read status register
+
+// SPI(nRF24L01) registers(addresses)
+#define RG_CONFIG          0x00  // 'Config' register address
+#define RG_EN_AA           0x01  // 'Enable Auto Acknowledgment' register address
+#define RG_EN_RXADDR       0x02  // 'Enabled RX addresses' register address
+#define RG_SETUP_AW        0x03  // 'Setup address width' register address
+#define RG_SETUP_RETR      0x04  // 'Setup Auto. Retrans' register address
+#define RG_RF_CH           0x05  // 'RF channel' register address
+#define RG_RF_SETUP        0x06  // 'RF setup' register address
+#define RG_STATUS          0x07  // 'Status' register address
+#define RG_OBSERVE_TX      0x08  // 'Observe TX' register address
+#define RG_CD              0x09  // 'Carrier Detect' register address
+#define RG_RX_ADDR_P0      0x0A  // 'RX address pipe0' register address
+#define RG_RX_ADDR_P1      0x0B  // 'RX address pipe1' register address
+#define RG_RX_ADDR_P2      0x0C  // 'RX address pipe2' register address
+#define RG_RX_ADDR_P3      0x0D  // 'RX address pipe3' register address
+#define RG_RX_ADDR_P4      0x0E  // 'RX address pipe4' register address
+#define RG_RX_ADDR_P5      0x0F  // 'RX address pipe5' register address
+#define RG_TX_ADDR         0x10  // 'TX address' register address
+#define RG_RX_PW_P0        0x11  // 'RX payload width, pipe0' register address
+#define RG_RX_PW_P1        0x12  // 'RX payload width, pipe1' register address
+#define RG_RX_PW_P2        0x13  // 'RX payload width, pipe2' register address
+#define RG_RX_PW_P3        0x14  // 'RX payload width, pipe3' register address
+#define RG_RX_PW_P4        0x15  // 'RX payload width, pipe4' register address
+#define RG_RX_PW_P5        0x16  // 'RX payload width, pipe5' register address
+#define RG_FIFO_STATUS     0x17  // 'FIFO Status Register' register address
+#define RG_DYNPD           0x1C  // 'Enable dynamic payload length
+#define RG_FEATURE         0x1D  // 'Feature register
+
+#define RD_STATUS_TX_FULL 0x01 // tx queue full
+#define RD_STATUS_RX_PNO  0x0E // pipe number of the received payload
+#define RD_STATUS_MAX_RT  0x10 // max retransmissions
+#define RD_STATUS_TX_DS   0x20 // data sent
+#define RD_STATUS_RX_DR   0x40 // data ready
+
+#define RD_CONFIG_PRIM_RX 0x01 // is primary receiver
+#define RD_CONFIG_PWR_UP  0x02 // power up
+#define RD_CONFIG_CRCO    0x04 // 2-byte CRC
+#define RD_CONFIG_EN_CRC  0x08 // enable CRC
+#define RD_CONFIG_DISABLE_IRQ_MAX_RT 0x10
+#define RD_CONFIG_DISABLE_IRQ_TX_DS 0x20
+#define RD_CONFIG_DISABLE_IRQ_RX_DR 0x40
+
+#define RD_FIFO_STATUS_RX_EMPTY 0x01
+#define RD_FIFO_STATUS_RX_FULL 0x02
+#define RD_FIFO_STATUS_TX_EMPTY 0x10
+#define RD_FIFO_STATUS_TX_FULL 0x20
+#define RD_FIFO_STATUS_TX_REUSE 0x40
+
+// Config register bits (excluding the bottom two that are changed dynamically)
+// enable only Rx IRQ
+#define ModeBits (RD_CONFIG_DISABLE_IRQ_MAX_RT | \
+                  RD_CONFIG_DISABLE_IRQ_TX_DS | \
+                  RD_CONFIG_EN_CRC | \
+                  RD_CONFIG_CRCO)
+
+static inline uint8_t CS(uint8_t hl)
+{
+    if (hl == 1) {
+        NSS(0);
+    }
+    else {
+        NSS(1);
+    }
+    return hl;
+}
+
+#define CHIPSELECT for (uint8_t cs = CS(1); cs==1; cs = CS(0))
+
+// Base NRF address - byte 4 may be modified before writing to a pipe register,
+// the first 4 bytes are shared in the network. Master is always code 0.
+static uint8_t nrf_base_address[5];
+
+static uint8_t nrf_pipe_addr[6];
+static bool nrf_pipe_enabled[6];
+
+static uint8_t NRF_WriteRegister(uint8_t reg, uint8_t value)
+{
+    uint8_t status = 0;
+    CHIPSELECT {
+        status = spi(CMD_WRITE_REG | reg);
+        spi(value);
+    }
+    dbg_nrf("Wr[0x%02x] := 0x%02x", (int)reg, (int) value);
+
+
+    uint8_t reg_val = 0;
+    CHIPSELECT {
+        spi(CMD_READ_REG | reg);
+        reg_val = spi(0);
+    }
+    dbg_nrf("     verify 0x%02x", (int)reg_val);
+    if (reg_val != value)
+        dbg_nrf("                           !!!");
+    else
+        dbg_nrf("                           OK");
+
+
+    return status;
+}
+
+static uint8_t NRF_ReadRegister(uint8_t reg)
+{
+    uint8_t reg_val = 0;
+    CHIPSELECT {
+        spi(CMD_READ_REG | reg);
+        reg_val = spi(0);
+    }
+    dbg_nrf("Rd[0x%02x]  = 0x%02x", (int)reg, (int) reg_val);
+    return reg_val;
+}
+
+static uint8_t NRF_ReadStatus(void)
+{
+    uint8_t reg_val = 0;
+    CHIPSELECT {
+        reg_val = spi(CMD_NOP);
+    }
+    return reg_val;
+}
+
+static uint8_t NRF_WriteBuffer(uint8_t reg, const uint8_t *pBuf, uint8_t bytes)
+{
+    uint8_t status = 0, i = 0;
+    CHIPSELECT {
+        status = spi(CMD_WRITE_REG | reg);
+        for (i = 0; i < bytes; i++) {
+            spi(*pBuf++);
+        }
+    }
+    return status;
+}
+
+static uint8_t NRF_ReadBuffer(uint8_t reg, uint8_t *pBuf, uint8_t bytes)
+{
+    uint8_t status = 0, i;
+    CHIPSELECT {
+        status = spi(CMD_READ_REG | reg);
+        for (i = 0; i < bytes; i++) {
+            pBuf[i] = spi(0);
+        }
+    }
+    return status;
+}
+
+void NRF_SetBaseAddress(const uint8_t *Bytes4)
+{
+    memcpy(nrf_base_address, Bytes4, 4);
+    nrf_base_address[4] = 0;
+
+    // write it to the two full-width address registers
+    NRF_WriteBuffer(RG_RX_ADDR_P0, nrf_base_address, 5);
+    nrf_base_address[4] = 1;// to be different
+    NRF_WriteBuffer(RG_RX_ADDR_P1, nrf_base_address, 5);
+}
+
+void NRF_SetRxAddress(uint8_t pipenum, uint8_t AddrByte)
+{
+    if (pipenum > 5) {
+        dbg_nrf("!! bad pipe %d", pipenum);
+        return;
+    }
+
+    nrf_base_address[4] = AddrByte;
+
+    nrf_pipe_addr[pipenum] = AddrByte;
+
+    dbg_nrf("Set Rx addr (pipe %d) = 0x%02x", (int)pipenum, AddrByte);
+    if (pipenum == 0) {
+        dbg_nrf("W ADDR_PA0: %02X-%02X-%02X-%02X-%02X", nrf_base_address[0], nrf_base_address[1], nrf_base_address[2], nrf_base_address[3], nrf_base_address[4]);
+        NRF_WriteBuffer(RG_RX_ADDR_P0, nrf_base_address, 5);
+    }
+    else if (pipenum == 1) {
+        dbg_nrf("W ADDR_PA1: %02X-%02X-%02X-%02X-%02X", nrf_base_address[0], nrf_base_address[1], nrf_base_address[2], nrf_base_address[3], nrf_base_address[4]);
+        NRF_WriteBuffer(RG_RX_ADDR_P1, nrf_base_address, 5);
+    }
+    else {
+        NRF_WriteRegister(RG_RX_ADDR_P2 + (pipenum - 2), AddrByte);
+    }
+}
+
+bool NRF_AddPipe(uint8_t AddrByte, uint8_t *PipeNum)
+{
+    for (uint8_t i = 0; i < 6; i++) {
+        if(!nrf_pipe_enabled[i]) {
+            NRF_SetRxAddress(i, AddrByte);
+            *PipeNum = i;
+            NRF_EnablePipe(i);
+            return true;
+        }
+    }
+
+    return false;
+}
+
+uint8_t NRF_PipeNum2Addr(uint8_t pipe_num)
+{
+    if (pipe_num > 5) return 0; // fail
+    return nrf_pipe_addr[pipe_num];
+}
+
+uint8_t NRF_Addr2PipeNum(uint8_t addr)
+{
+    for (int i = 0; i < 6; i++) {
+        if (nrf_pipe_addr[i] == addr) return (uint8_t) i;
+    }
+    return 0xFF;
+}
+
+void NRF_EnablePipe(uint8_t pipenum)
+{
+    dbg_nrf("Enable pipe num %d", (int)pipenum);
+    uint8_t enabled = NRF_ReadRegister(RG_EN_RXADDR);
+    enabled |= 1 << pipenum;
+    NRF_WriteRegister(RG_EN_RXADDR, enabled);
+
+    nrf_pipe_enabled[pipenum] = 1;
+}
+
+void NRF_DisablePipe(uint8_t pipenum)
+{
+    uint8_t enabled = NRF_ReadRegister(RG_EN_RXADDR);
+    enabled &= ~(1 << pipenum);
+    NRF_WriteRegister(RG_EN_RXADDR, enabled);
+
+    nrf_pipe_enabled[pipenum] = 0;
+}
+
+static void NRF_SetTxAddress(uint8_t SendTo)
+{
+    nrf_base_address[4] = SendTo;
+
+    dbg_nrf("W Tx_ADDR + Rx0: %02X-%02X-%02X-%02X-%02X",
+        nrf_base_address[0], nrf_base_address[1], nrf_base_address[2], nrf_base_address[3], nrf_base_address[4]);
+
+    NRF_WriteBuffer(RG_TX_ADDR, nrf_base_address, 5);
+    NRF_WriteBuffer(RG_RX_ADDR_P0, nrf_base_address, 5); // the ACK will come to pipe 0
+}
+
+void NRF_PowerDown(void)
+{
+    dbg_nrf("PDn");
+    CE(0);
+    NRF_WriteRegister(RG_CONFIG, ModeBits);
+}
+
+void NRF_ModeTX(void)
+{
+    dbg_nrf("Tx Mode");
+
+    CE(0);
+    uint8_t m = NRF_ReadRegister(RG_CONFIG);
+    NRF_WriteRegister(RG_CONFIG, ModeBits | RD_CONFIG_PWR_UP);
+    if ((m & RD_CONFIG_PWR_UP) == 0) {
+        // switching on
+        LL_mDelay(5);
+    }
+}
+
+void NRF_ModeRX(void)
+{
+    dbg_nrf("Rx Mode");
+    NRF_WriteRegister(RG_CONFIG, ModeBits | RD_CONFIG_PWR_UP | RD_CONFIG_PRIM_RX);
+    NRF_SetRxAddress(0, nrf_pipe_addr[0]); // set the P0 address - it was changed during Rx for ACK reception
+    CE(1);
+
+    //if ((m&2)==0) LL_mDelay()(5); You don't need to wait. Just nothing will come for 5ms or more
+}
+
+uint8_t NRF_IsModePowerDown(void)
+{
+    uint8_t ret = 0;
+    if ((NRF_ReadRegister(RG_CONFIG) & RD_CONFIG_PWR_UP) == 0) ret = 1;
+    return ret;
+}
+
+uint8_t NRF_IsModeTX(void)
+{
+    uint8_t m = NRF_ReadRegister(RG_CONFIG);
+    if ((m & RD_CONFIG_PWR_UP) == 0) return 0; // OFF
+    if ((m & RD_CONFIG_PRIM_RX) == 0) return 1;
+    return 0;
+}
+
+uint8_t NRF_IsModeRx(void)
+{
+    uint8_t m = NRF_ReadRegister(RG_CONFIG);
+    if ((m & RD_CONFIG_PWR_UP) == 0) return 0; // OFF
+    if ((m & RD_CONFIG_PRIM_RX) == 0) return 0;
+    return 1;
+}
+
+void NRF_SetChannel(uint8_t Ch)
+{
+    NRF_WriteRegister(RG_RF_CH, Ch);
+}
+
+uint8_t NRF_ReceivePacket(uint8_t *Packet, uint8_t *PipeNum)
+{
+    uint8_t pw = 0, status;
+//    if (!NRF_IsRxPacket()) {
+//        dbg("rx queue empty");
+//        return 0;
+//    }
+
+//    const uint8_t orig_conf = NRF_ReadRegister(RG_CONFIG);
+//    CE(0); // quit Rx mode - go idle
+
+    CHIPSELECT {
+        status = spi(CMD_RD_RX_PL_WIDTH);
+        pw = spi(0);
+    }
+
+    if (pw == 0) {
+        dbg("empty pld");
+    }
+
+    if (pw > 32) {
+        CHIPSELECT {
+            spi(CMD_FLUSH_RX);
+        }
+        pw = 0;
+        dbg("over 32");
+    } else {
+        // Read the reception pipe number
+        *PipeNum = ((status & RD_STATUS_RX_PNO) >> 1);
+        CHIPSELECT {
+            spi(CMD_RD_RX_PLD);
+            for (uint8_t i = 0; i < pw; i++) Packet[i] = spi(0);
+        }
+    }
+    NRF_WriteRegister(RG_STATUS, RD_STATUS_RX_DR); // Clear the RX_DR interrupt
+
+//    if ((orig_conf & RD_CONFIG_PWR_UP) == 0) {
+//        dbg_nrf("going back PwrDn");
+//        NRF_PowerDown();
+//    }
+//    else if ((orig_conf & RD_CONFIG_PRIM_RX) == RD_CONFIG_PRIM_RX) {
+//        dbg_nrf("going back PwrUp+Rx");
+//        NRF_ModeRX();
+//    }
+//    CE(1); // back to rx
+    return pw;
+}
+
+bool NRF_IsRxPacket(void)
+{
+    return 0 == (NRF_ReadRegister(RG_FIFO_STATUS) & RD_FIFO_STATUS_RX_EMPTY);
+//    uint8_t ret = NRF_ReadRegister(RG_STATUS) & RD_STATUS_RX_DR;
+//    return 0 != ret;
+}
+
+bool NRF_SendPacket(uint8_t PipeNum, const uint8_t *Packet, uint8_t Length)
+{
+    if (!nrf_pipe_enabled[PipeNum]) {
+        dbg_nrf("!! Pipe %d not enabled", PipeNum);
+        return 0;
+    }
+
+    dbg_nrf("Will tx to addr %02x", nrf_pipe_addr[PipeNum]);
+
+    const uint8_t orig_conf = NRF_ReadRegister(RG_CONFIG);
+    CE(0);
+    NRF_ModeTX();        // Make sure in TX mode
+    NRF_SetTxAddress(nrf_pipe_addr[PipeNum]); // this sets the Tx addr and also pipe 0 addr for ACK
+
+    CHIPSELECT {
+        spi(CMD_FLUSH_TX);
+    };
+
+    CHIPSELECT {
+        spi(CMD_WR_TX_PLD);
+        for (uint8_t i = 0; i < Length; i++) spi(Packet[i]);
+    };
+
+    // CE pulse
+    CE(1);
+    _delay_us(20); // At least 10 us
+    CE(0);
+
+    uint8_t st = 0;
+    while ((st & (RD_STATUS_MAX_RT|RD_STATUS_TX_DS)) == 0) {
+        st = NRF_ReadStatus(); // Packet acked or timed out
+    }
+
+    dbg_nrf("Send status: 0x%02x - MAX_RT %d, SENT %d", (int)st,
+        (st&RD_STATUS_MAX_RT) != 0, (st&RD_STATUS_TX_DS) != 0);
+
+    NRF_WriteRegister(RG_STATUS, st & (RD_STATUS_MAX_RT|RD_STATUS_TX_DS)); // Clear the bit
+
+    if ((orig_conf & RD_CONFIG_PWR_UP) == 0) {
+        dbg_nrf("going back PwrDn");
+        NRF_PowerDown();
+    }
+    else if ((orig_conf & RD_CONFIG_PRIM_RX) == RD_CONFIG_PRIM_RX) {
+        dbg_nrf("going back PwrUp+Rx");
+        NRF_ModeRX();
+    }
+
+    return 0 != (st & RD_STATUS_TX_DS); // success
+}
+
+bool NRF_Init(uint8_t pSpeed)
+{
+    // Set the required output pins
+    NSS(1);
+    CE(0);
+
+    LL_mDelay(200);
+
+    for (int i = 0; i < 6; i++) {
+        nrf_pipe_addr[i] = 0;
+        nrf_pipe_enabled[i] = 0;
+    }
+
+    // this is a test if there's anything present
+    uint8_t awreg = NRF_ReadRegister(RG_SETUP_AW);
+    if (awreg == 0 || awreg > 3) return false;
+
+    // clear flags etc
+    NRF_PowerDown();
+    CHIPSELECT { spi(CMD_FLUSH_RX); }
+    CHIPSELECT { spi(CMD_FLUSH_TX); }
+    NRF_WriteRegister(RG_STATUS, 0x70);
+
+    NRF_WriteRegister(RG_CONFIG, ModeBits);
+    NRF_WriteRegister(RG_SETUP_AW, 0b11);             // 5 byte addresses
+
+    NRF_WriteRegister(RG_EN_RXADDR, 0x01); // disable all, enable pipe 0 - this is required for shockburst, despite not being specified in the DS
+
+    NRF_WriteRegister(RG_SETUP_RETR, 0x18);        // 8 retries
+    NRF_WriteRegister(RG_RF_CH, 2);                // channel 2 NO HIGHER THAN 83 in USA!
+
+    NRF_WriteRegister(RG_RF_SETUP, pSpeed);
+
+    NRF_WriteRegister(RG_DYNPD, 0b111111);         // Dynamic packet length
+    NRF_WriteRegister(RG_FEATURE, 0b100);          // Enable dynamic payload, and no payload in the ack.
+
+//    for (int i = 0; i < 6; i++) {
+//        NRF_WriteRegister(RG_RX_PW_P0+i, 32);      // Receive 32 byte packets - XXX this is probably not needed with dynamic length
+//    }
+
+    return true;
+}
+
+#endif
--- a/comm/nrf.h
+++ b/comm/nrf.h
@ -0,0 +1,163 @@
+//
+// Created by MightyPork on 2018/04/02.
+//
+
+#ifndef GEX_NRF_NRF_H
+#define GEX_NRF_NRF_H
+
+/*
+ * nordic.h
+ *
+ * Created:12/16/2013 3:36:04 PM
+ *  Author: Tom
+ *
+ *    NRF24L01+ Library II
+ *
+ */
+
+#include "platform.h"
+#if SUPPORT_NRF
+
+#include "resources.h"
+#include "nrf_pins.h"
+
+#define dbg_nrf(...) do{}while(0)
+//#define dbg_nrf dbg
+
+// Initialize SPI and the Nordic
+
+/**
+ * Initialize the NRF module
+ *
+ * @param pSpeed
+ * @return success (0 if device not detected)
+ */
+bool NRF_Init(uint8_t pSpeed);
+
+#define NRF_SPEED_500k 0b00100110
+#define NRF_SPEED_2M 0b00001110
+#define NRF_SPEED_1M 0b00000110
+
+/**
+ * Set the reset pin (this is a PMOS controlling its power)
+ *
+ * @param enable_reset 1 to go into reset, 0 to enter operational state (will need some time to become ready)
+ */
+void NRF_Reset(bool enable_reset);
+
+/**
+ * Set reception address
+ * @param pipenum - pipe to set
+ * @param AddrByte - byte 0
+ */
+void NRF_SetRxAddress(uint8_t pipenum, uint8_t AddrByte);
+
+/**
+ * Set communication channel
+ */
+void NRF_SetChannel(uint8_t Ch) ; // 0 through 83 only!
+
+/**
+ * Power down the transceiver
+ */
+void NRF_PowerDown(void);
+
+/**
+ * Selecr RX mode
+ */
+void NRF_ModeRX(void);
+
+/**
+ * Select TX mode
+ */
+void NRF_ModeTX(void);
+
+/**
+ * @return NRF is power down
+ */
+uint8_t NRF_IsModePowerDown(void);
+
+/**
+ * @return NRF in TX mode
+ */
+uint8_t NRF_IsModeTX(void);
+
+/**
+ * @return NRF in RX mode
+ */
+uint8_t NRF_IsModeRx(void);
+
+/**
+ * Add a pipe to the next free slot
+ *
+ * @param AddrByte - address byte of the peer
+ * @param[out] PipeNum - pipe number is written here
+ * @return success
+ */
+bool NRF_AddPipe(uint8_t AddrByte, uint8_t *PipeNum);
+
+/**
+ * Convert pipe number to address byte
+ *
+ * @param pipe_num - pipe number
+ * @return address byte
+ */
+uint8_t NRF_PipeNum2Addr(uint8_t pipe_num);
+
+/**
+ * Convert address to a pipe number
+ *
+ * @param addr
+ * @return
+ */
+uint8_t NRF_Addr2PipeNum(uint8_t addr);
+
+/**
+ * Send a packet (takes care of mode switching etc)
+ *
+ * @param PipeNum - pipe number
+ * @param Packet - packet bytes
+ * @param Length - packet length
+ * @return success (ACK'd)
+ */
+bool NRF_SendPacket(uint8_t PipeNum, const uint8_t *Packet, uint8_t Length);
+
+/**
+ * Receive a packet
+ *
+ * @param[out] Packet - the receiuved packet - buffer that is written
+ * @param[out] PipeNum - pipe number that was received from
+ * @return packet size, 0 on failure
+ */
+uint8_t NRF_ReceivePacket(uint8_t *Packet, uint8_t *PipeNum);
+
+/**
+ * Set base address
+ * @param Bytes4
+ */
+void NRF_SetBaseAddress(const uint8_t *Bytes4);
+
+/**
+ * Check if there's a packet to be read
+ *
+ * @return 1 if any to read
+ */
+bool NRF_IsRxPacket(void);
+
+/**
+ * Enable a pipe
+ *
+ * @param pipenum - pipe number 0-5
+ */
+void NRF_EnablePipe(uint8_t pipenum);
+
+/**
+ * Disable a pipe
+ *
+ * @param pipenum - pipe number 0-5
+ */
+void NRF_DisablePipe(uint8_t pipenum);
+
+#endif // SUPPORT_NRF
+
+#endif //GEX_NRF_NRF_H
--- a/framework/rsc_enum.h
+++ b/framework/rsc_enum.h
@ -4,15 +4,15 @@
 // Enum of all defined resources
 //

-#ifndef GEX_F072_RSC_ENUM_H
-#define GEX_F072_RSC_ENUM_H
+#ifndef GEX_CORE_RSC_ENUM_H
+#define GEX_CORE_RSC_ENUM_H

 // X macro: Resource name,
 #define XX_RESOURCES \
    X(SPI1) X(SPI2) X(SPI3) \
    X(I2C1) X(I2C2) X(I2C3) \
    X(ADC1) X(ADC2) X(ADC3) X(ADC4) \
-    X(DAC1) X(DAC2) \
+    X(DAC1) \
    X(TSC) \
    X(USART1) X(USART2) X(USART3) X(USART4) X(USART5) X(USART6) \
    X(TIM1) X(TIM2) X(TIM3) X(TIM4) X(TIM5) \
@ -132,4 +132,4 @@ static inline void rscmap_free(ResourceMap *rscmap, Resource rsc)
 #define RSC_CLAIM(rscmap, rsc)   rscmap_claim(&rscmap, (rsc))
 #define RSC_FREE(rscmap, rsc)    rscmap_free(&rscmap, (rsc))

-#endif //GEX_F072_RSC_ENUM_H
+#endif //GEX_CORE_RSC_ENUM_H
--- a/framework/settings.c
+++ b/framework/settings.c
@ -2,6 +2,7 @@
 // Created by MightyPork on 2017/11/26.
 //

+#include <comm/interfaces.h>
 #include "platform.h"
 #include "utils/hexdump.h"
 #include "settings.h"
@ -9,6 +10,7 @@
 #include "system_settings.h"
 #include "utils/str_utils.h"
 #include "unit_base.h"
+#include "platform/debug_uart.h"
 #include "utils/avrlibc.h"

 // pre-declarations
@ -108,7 +110,7 @@ void settings_save(void)
        erase.Banks = FLASH_BANK_1; // TODO ?????
 #endif

-#if defined(GEX_PLAT_F407_DISCOVERY)
+#if GEX_PLAT_F407
        // specialty for F4 with too much flash
        erase.NbSectors = 1;
        erase.Sector = SETTINGS_FLASH_SECTOR;
@ -120,6 +122,7 @@ void settings_save(void)
        erase.PageAddress = SETTINGS_FLASH_ADDR;
        erase.TypeErase = FLASH_TYPEERASE_PAGES;
 #endif
+
        uint32_t pgerror = 0;
        hst = HAL_FLASHEx_Erase(&erase, &pgerror);
        assert_param(pgerror == 0xFFFFFFFFU);
@ -300,7 +303,6 @@ void settings_load_ini_begin(void)
    SystemSettings.loading_inifile = 0;
 }

-
 void settings_load_ini_key(const char *restrict section, const char *restrict key, const char *restrict value)
 {
 //    dbg("[%s] %s = %s", section, key, value);
@ -312,6 +314,7 @@ void settings_load_ini_key(const char *restrict section, const char *restrict ke
    if (streq(section, "SYSTEM")) {
        if (SystemSettings.loading_inifile == 0) {
            SystemSettings.loading_inifile = 'S';
+            systemsettings_begin_load();
            systemsettings_loadDefaults();
        }

@ -356,4 +359,8 @@ void settings_load_ini_end(void)
        bool suc = ureg_finalize_all_init();
        if (!suc) dbg("Some units failed to init!!");
    }
+
+    if (SystemSettings.loading_inifile == 'S') {
+        systemsettings_finalize_load();
+    }
 }
--- a/framework/system_settings.c
+++ b/framework/system_settings.c
@ -7,6 +7,15 @@
 #include "utils/str_utils.h"
 #include "platform/lock_jumper.h"
 #include "cfg_utils.h"
+#include "resources.h"
+#include "unit_base.h"
+#include "platform/debug_uart.h"
+#include "comm/interfaces.h"
+
+static void systemsettings_mco_teardown(void);
+static void systemsettings_mco_init(void);
+/** Init/deinit debug uart */
+static void systemsettings_debug_uart_init_deinit(void);

 struct system_settings SystemSettings;

@ -15,6 +24,24 @@ void systemsettings_loadDefaults(void)
 {
    SystemSettings.visible_vcom = true;
    SystemSettings.ini_comments = true;
+    SystemSettings.enable_mco = false;
+    SystemSettings.mco_prediv = 7;
+
+    SystemSettings.use_comm_uart = false; // TODO configure those based on compile flags for a particular platform
+    SystemSettings.use_comm_lora = false;
+    SystemSettings.use_comm_nordic = false;
+    SystemSettings.comm_uart_baud = 115200; // TODO
+
+    // just a demo, user must change this
+    SystemSettings.nrf_network[0] = 0x12;
+    SystemSettings.nrf_network[2] = 0x09;
+    SystemSettings.nrf_network[3] = 0x4c;
+    SystemSettings.nrf_network[4] = 0x61;
+
+    SystemSettings.nrf_address = 1;
+    SystemSettings.nrf_channel = 76;
+
+    SystemSettings.enable_debug_uart = true;
 }

 /** Load defaults and init flags */
@ -31,18 +58,35 @@ void systemsettings_init(void)
 void systemsettings_save(PayloadBuilder *pb)
 {
    pb_char(pb, 'S');
-    pb_u8(pb, 0); // settings format version
+    pb_u8(pb, 3); // settings format version

    { // system settings
        pb_bool(pb, SystemSettings.visible_vcom);
        pb_bool(pb, SystemSettings.ini_comments);
+        // 1
+        pb_bool(pb, SystemSettings.enable_mco);
+        pb_u8(pb, SystemSettings.mco_prediv);
+        // 2
+        pb_bool(pb, SystemSettings.use_comm_uart);
+        pb_bool(pb, SystemSettings.use_comm_nordic);
+        pb_bool(pb, SystemSettings.use_comm_lora);
+        pb_u32(pb, SystemSettings.comm_uart_baud);
+        pb_bool(pb, SystemSettings.enable_debug_uart);
+        // 3
+        pb_u8(pb, SystemSettings.nrf_channel);
+        pb_u8(pb, SystemSettings.nrf_address);
+        pb_buf(pb, SystemSettings.nrf_network, 4);
    } // end system settings
 }

+
 // from binary
 bool systemsettings_load(PayloadParser *pp)
 {
    if (pp_char(pp) != 'S') return false;
+
+    systemsettings_begin_load();
+
    uint8_t version = pp_u8(pp);

    { // system settings
@ -50,13 +94,80 @@ bool systemsettings_load(PayloadParser *pp)
        SystemSettings.ini_comments = pp_bool(pp);

        // conditional fields based on version
-        (void) version;
+        if (version >= 1) {
+            SystemSettings.enable_mco = pp_bool(pp);
+            SystemSettings.mco_prediv = pp_u8(pp);
+        }
+        if (version >= 2) {
+            SystemSettings.use_comm_uart = pp_bool(pp);
+            SystemSettings.use_comm_nordic = pp_bool(pp);
+            SystemSettings.use_comm_lora = pp_bool(pp);
+            SystemSettings.comm_uart_baud = pp_u32(pp);
+            SystemSettings.enable_debug_uart = pp_bool(pp);
+        }
+        if (version >= 3) {
+            SystemSettings.nrf_channel = pp_u8(pp);
+            SystemSettings.nrf_address = pp_u8(pp);
+            pp_buf(pp, SystemSettings.nrf_network, 4);
+        }
    } // end system settings

+    systemsettings_finalize_load();
+
    return pp->ok;
 }


+void systemsettings_mco_teardown(void)
+{
+    if (SystemSettings.enable_mco) {
+        rsc_free(&UNIT_SYSTEM, R_PA8);
+        LL_RCC_ConfigMCO(LL_RCC_MCO1SOURCE_NOCLOCK, 0);
+    }
+}
+
+void systemsettings_mco_init(void)
+{
+    if (SystemSettings.enable_mco) {
+        assert_param(rsc_claim(&UNIT_SYSTEM, R_PA8) == E_SUCCESS);
+
+        assert_param(E_SUCCESS == hw_configure_gpiorsc_af(R_PA8, LL_GPIO_AF_0));
+        LL_RCC_ConfigMCO(LL_RCC_MCO1SOURCE_SYSCLK, SystemSettings.mco_prediv << RCC_CFGR_MCOPRE_Pos);
+    } else {
+        LL_RCC_ConfigMCO(LL_RCC_MCO1SOURCE_NOCLOCK, 0);
+    }
+}
+
+void systemsettings_debug_uart_init_deinit(void)
+{
+#if USE_DEBUG_UART
+    if (SystemSettings.enable_debug_uart) {
+        DebugUart_Init();
+    } else {
+        DebugUart_Teardown();
+    }
+#endif
+}
+
+/**
+ * Begin load of system settings, releasing resources etc
+ */
+void systemsettings_begin_load(void)
+{
+    systemsettings_mco_teardown();
+    com_release_resources_for_alt_transfers();
+}
+
+/**
+ * Claim resources and set up system components based on the loaded settings
+ */
+void systemsettings_finalize_load(void)
+{
+    systemsettings_mco_init();
+    systemsettings_debug_uart_init_deinit();
+    com_claim_resources_for_alt_transfers();
+}
+
 /**
 * Write system settings to INI (without section)
 */
@ -65,10 +176,53 @@ void systemsettings_build_ini(IniWriter *iw)
    iw_section(iw, "SYSTEM");

    iw_comment(iw, "Data link accessible as virtual comport (Y, N)");
-    iw_entry(iw, "expose_vcom", str_yn(SystemSettings.visible_vcom));
+    iw_entry_s(iw, "expose-vcom", str_yn(SystemSettings.visible_vcom));

    iw_comment(iw, "Show comments in INI files (Y, N)");
-    iw_entry(iw, "ini_comments", str_yn(SystemSettings.ini_comments));
+    iw_entry_s(iw, "ini-comments", str_yn(SystemSettings.ini_comments));
+
+    iw_comment(iw, "Enable debug UART-Tx on PA9 (Y, N)"); // TODO update if moved to a different pin
+    iw_entry_s(iw, "debug-uart", str_yn(SystemSettings.enable_debug_uart));
+
+    iw_cmt_newline(iw);
+    iw_comment(iw, "Output core clock on PA8 (Y, N)");
+    iw_entry_s(iw, "mco-enable", str_yn(SystemSettings.enable_mco));
+    iw_comment(iw, "Output clock prediv (1,2,...,128)");
+    iw_entry_d(iw, "mco-prediv", (1<<SystemSettings.mco_prediv));
+
+    iw_cmt_newline(iw);
+    iw_comment(iw, "--- Allowed fallback communication ports ---");
+
+    iw_cmt_newline(iw);
+    iw_comment(iw, "UART Tx:PA2, Rx:PA3");
+    iw_entry_s(iw, "com-uart", str_yn(SystemSettings.use_comm_uart));
+    iw_entry_d(iw, "com-uart-baud", SystemSettings.comm_uart_baud);
+
+#if SUPPORT_NRF
+    iw_cmt_newline(iw);
+    iw_comment(iw, "nRF24L01+ radio");
+    iw_entry_s(iw, "com-nrf", str_yn(SystemSettings.use_comm_nordic));
+
+    iw_comment(iw, "Radio channel (0-125)");
+    iw_entry_d(iw, "nrf-channel", SystemSettings.nrf_channel);
+
+    iw_comment(iw, "Network prefix (hex, 4 bytes)");
+    iw_entry(iw, "nrf-network", "%02X:%02X:%02X:%02X",
+             SystemSettings.nrf_network[0],
+             SystemSettings.nrf_network[1],
+             SystemSettings.nrf_network[2],
+             SystemSettings.nrf_network[3]);
+
+    iw_comment(iw, "Node address (1-255)");
+    iw_entry(iw, "nrf-address", "%d", (int)SystemSettings.nrf_address);
+#endif // SUPPORT_NRF
+
+    // those aren't implement yet, don't tease the user
+    // TODO show pin-out, extra settings if applicable
+#if 0
+    iw_comment(iw, "LoRa/GFSK sx127x");
+    iw_entry_s(iw, "com-lora", str_yn(SystemSettings.use_comm_sx127x));
+#endif
 }

 /**
@ -77,15 +231,78 @@ void systemsettings_build_ini(IniWriter *iw)
 bool systemsettings_load_ini(const char *restrict key, const char *restrict value)
 {
    bool suc = true;
-    if (streq(key, "expose_vcom")) {
+    if (streq(key, "expose-vcom")) {
        bool yn = cfg_bool_parse(value, &suc);
        if (suc) SystemSettings.visible_vcom = yn;
    }

-    if (streq(key, "ini_comments")) {
+    if (streq(key, "ini-comments")) {
        bool yn = cfg_bool_parse(value, &suc);
        if (suc) SystemSettings.ini_comments = yn;
    }

+    if (streq(key, "mco-enable")) {
+        bool yn = cfg_bool_parse(value, &suc);
+        if (suc) SystemSettings.enable_mco = yn;
+    }
+
+    if (streq(key, "mco-prediv")) {
+        int val = cfg_u8_parse(value, &suc);
+        if (suc) {
+            switch (val) {
+                case 1: SystemSettings.mco_prediv = 0; break;
+                case 2: SystemSettings.mco_prediv = 1; break;
+                case 4: SystemSettings.mco_prediv = 2; break;
+                case 8: SystemSettings.mco_prediv = 3; break;
+                case 16: SystemSettings.mco_prediv = 4; break;
+                case 32: SystemSettings.mco_prediv = 5; break;
+                case 64: SystemSettings.mco_prediv = 6; break;
+                default:
+                case 128: SystemSettings.mco_prediv = 7; break;
+            }
+        }
+    }
+
+    if (streq(key, "debug-uart")) {
+        bool yn = cfg_bool_parse(value, &suc);
+        if (suc) SystemSettings.enable_debug_uart = yn;
+    }
+
+    if (streq(key, "com-uart")) {
+        bool yn = cfg_bool_parse(value, &suc);
+        if (suc) SystemSettings.use_comm_uart = yn;
+    }
+
+    if (streq(key, "com-uart-baud")) {
+        uint32_t baud = cfg_u32_parse(value, &suc);
+        if (suc) SystemSettings.comm_uart_baud = baud;
+    }
+
+#if SUPPORT_NRF
+    if (streq(key, "com-nrf")) {
+        bool yn = cfg_bool_parse(value, &suc);
+        if (suc) SystemSettings.use_comm_nordic = yn;
+    }
+
+    if (streq(key, "nrf-channel")) {
+        SystemSettings.nrf_channel = cfg_u8_parse(value, &suc);
+    }
+
+    if (streq(key, "nrf-address")) {
+        SystemSettings.nrf_address = cfg_u8_parse(value, &suc);
+    }
+
+    if (streq(key, "nrf-network")) {
+        cfg_hex_parse(&SystemSettings.nrf_network[0], 4, value, &suc);
+    }
+#endif // SUPPORT_NRF
+
+#if 0
+    if (streq(key, "com-lora")) {
+        bool yn = cfg_bool_parse(value, &suc);
+        if (suc) SystemSettings.use_comm_lora = yn;
+    }
+#endif
+
    return suc;
 }
--- a/framework/system_settings.h
+++ b/framework/system_settings.h
@ -18,6 +18,18 @@
 struct system_settings {
    bool visible_vcom;
    bool ini_comments;
+    bool enable_mco;
+    uint8_t mco_prediv;
+    bool enable_debug_uart;
+
+    // enable alternate communication ports if USB doesn't enumerate (e.g. running from battery / solar cell remotely)
+    bool use_comm_uart;
+    uint32_t comm_uart_baud; // baud rate for the uart transport
+    bool use_comm_lora;   // SX1276/8
+    bool use_comm_nordic; // nRF24L01+
+    uint8_t nrf_channel;
+    uint8_t nrf_network[4];
+    uint8_t nrf_address;

    // Support flags put here for scoping, but not atcually part of the persistent settings
    volatile bool editable; //!< True if we booted with the LOCK jumper removed
@ -60,4 +72,9 @@ void systemsettings_build_ini(IniWriter *iw);
 */
 bool systemsettings_load_ini(const char *restrict key, const char *restrict value);

+/** Release system resources before system settings init */
+void systemsettings_begin_load(void);
+/** Claim system resources and apply system settings */
+void systemsettings_finalize_load(void);
+
 #endif //GEX_SYSTEM_SETTINGS_H
--- a/framework/unit_registry.c
+++ b/framework/unit_registry.c
@ -276,7 +276,7 @@ bool ureg_instantiate_by_ini(const char *restrict driver_name, const char *restr
                char *name = NULL;
                if (delim != NULL) {
                    // not last
-                    name = strndup_ck(p, delim - p);
+                    name = strndup_ck(p, delim - p + 1);
                    p = delim + 1;
                } else {
                    // last name
@ -334,6 +334,7 @@ bool ureg_finalize_all_init(void)
    uint8_t callsign = 1;
    while (li != NULL) {
        Unit *const pUnit = &li->unit;
+        dbg("+ %s \"%s\"", pUnit->driver->name, pUnit->name);

        if (pUnit->status == E_SUCCESS) {
            dbg("! Unit seems already loaded, skipping");
--- a/freertos.c
+++ b/freertos.c
@ -169,7 +169,7 @@ void MX_FREERTOS_Init(void) {

  /* USER CODE BEGIN RTOS_SEMAPHORES */
  /* add semaphores, ... */
-  assert_param(pdTRUE == xSemaphoreGive(semVcomTxReadyHandle));
+  xSemaphoreGive(semVcomTxReadyHandle);
  /* USER CODE END RTOS_SEMAPHORES */

  /* USER CODE BEGIN RTOS_TIMERS */
--- a/gex.mk
+++ b/gex.mk
@ -1,60 +1,28 @@
-GEX_SRC_DIR = \
-    User \
-    User/utils \
-    User/comm \
-    User/framework \
-    User/platform \
-    User/units \
-    User/units/neopixel \
-    User/units/test \
-    User/units/digital_out \
-    User/units/digital_in \
-    User/units/usart \
-    User/units/1wire \
-    User/units/i2c \
-    User/units/spi \
-    User/units/adc \
-    User/units/sipo \
-    User/units/fcap \
-    User/units/touch \
-    User/units/simple_pwm \
-    User/TinyFrame \
-    User/CWPack \
-    User/tasks
-
-GEX_SOURCES = \
-    User/USB/usb_device.c \
-    User/USB/usbd_cdc_if.c \
-    User/USB/usbd_conf.c \
-    User/USB/usbd_desc.c \
-    User/USB/STM32_USB_Device_Library/Class/CDC/Src/usbd_cdc.c \
-    User/USB/STM32_USB_Device_Library/Class/MSC_CDC/usbd_msc_cdc.c \
-    User/USB/STM32_USB_Device_Library/Core/Src/usbd_core.c \
-    User/USB/STM32_USB_Device_Library/Core/Src/usbd_ctlreq.c \
-    User/USB/STM32_USB_Device_Library/Core/Src/usbd_ioreq.c
-
-GEX_INCLUDES = \
-    -IUser \
-    -IUser/USB \
-    -IUser/USB/MSC_CDC \
-    -IUser/TinyFrame \
-    -IUser/vfs \
-    -IUser/utils \
-    -IUser/units \
-    -IUser/framework \
-    -IUser/platform \
-    -IUser/tasks \
-    -IUser/USB/STM32_USB_Device_Library/Core/Inc \
-    -IUser/USB/STM32_USB_Device_Library/Class/AUDIO/Inc \
-    -IUser/USB/STM32_USB_Device_Library/Class/CDC/Inc \
-    -IUser/USB/STM32_USB_Device_Library/Class/CustomHID/Inc \
-    -IUser/USB/STM32_USB_Device_Library/Class/DFU/Inc \
-    -IUser/USB/STM32_USB_Device_Library/Class/HID/Inc \
-    -IUser/USB/STM32_USB_Device_Library/Class/MSC/Inc \
-    -IUser/USB/STM32_USB_Device_Library/Class/MSC_CDC
-
-GEX_CFLAGS = \
-    -D__weak="__attribute__((weak))" -D__packed="__attribute__((__packed__))"  \
+#####################################################
+# Platform-independent, not directly related to GEX
+#####################################################
+
+# C
+COMMON_C_DIRS = \
+    Drivers \
+    Drivers/CMSIS \
+    Middlewares \
+    Middlewares/FreeRTOS
+
+COMMON_C_FILES =  \
+    Middlewares/Third_Party/FreeRTOS/Source/CMSIS_RTOS/cmsis_os.c \
+    Middlewares/Third_Party/FreeRTOS/Source/croutine.c \
+    Middlewares/Third_Party/FreeRTOS/Source/event_groups.c \
+    Middlewares/Third_Party/FreeRTOS/Source/list.c \
+    Middlewares/Third_Party/FreeRTOS/Source/queue.c \
+    Middlewares/Third_Party/FreeRTOS/Source/tasks.c \
+    Middlewares/Third_Party/FreeRTOS/Source/timers.c \
+    Middlewares/Third_Party/FreeRTOS/Source/portable/MemMang/heap_4.c \
+    Src/main.c
+
+COMMON_C_FLAGS = \
+    -DUSE_HAL_DRIVER \
+    -DUSE_FULL_LL_DRIVER \
    -std=gnu99 -Wfatal-errors \
    -Wall -Wextra -Wshadow \
    -Wwrite-strings -Wold-style-definition -Winline -Wstrict-prototypes -Wreturn-type \
@ -66,16 +34,88 @@ GEX_CFLAGS = \
    -fno-exceptions -finline-small-functions -findirect-inlining -Wno-strict-aliasing -Wno-float-equal \
    -Wno-discarded-qualifiers -fstack-usage
    
-GEX_CDEFS_BASE =  \
-    -D__weak="__attribute__((weak))" \
-    -D__packed="__attribute__((__packed__))" \
-    -DUSE_FULL_LL_DRIVER \
+ifeq ($(DEBUG), 1)
+COMMON_C_FLAGS += -ggdb -g -gdwarf-2
+endif

+COMMON_C_INCLUDES = \
+    -IInc \
+    -IMiddlewares/Third_Party/FreeRTOS/Source/include \
+    -IMiddlewares/Third_Party/FreeRTOS/Source/CMSIS_RTOS \
+    -IDrivers/CMSIS/Include

+# ASM
+COMMON_AS_DIRS = \

-ifeq '$(DISABLE_DEBUG)' '1'
+COMMON_AS_FILES = \
+
+COMMON_AS_FLAGS = \
+    -Wall -fdata-sections -ffunction-sections
+
+COMMON_AS_INCLUDES = \
+    -IInc
+
+#####################################################
+# Platform-independent, GEX specific
+#####################################################
+
+GEX_UNIT_DIRS := $(foreach x,$(GEX_UNITS), GexUnits/$(x))
+GEX_UNIT_DEFS := $(foreach x,$(GEX_UNITS), -DENABLE_UNIT_$(shell echo $(x) | tr a-z A-Z)=1) \
+                -DUNITS_REGISTER_CMD="$(foreach x,$(GEX_UNITS),ureg_add_type(&UNIT_$(shell echo $(x) | tr a-z A-Z));)"
+
+GEX_C_DIRS = \
+    GexCore \
+    GexCore/utils \
+    GexCore/comm \
+    GexCore/framework \
+    GexCore/platform \
+    GexCore/units \
+    GexCore/TinyFrame \
+    GexCore/tasks \
+    $(GEX_UNIT_DIRS)
+
+GEX_C_FILES = \
+    GexCore/USB/usb_device.c \
+    GexCore/USB/usbd_cdc_if.c \
+    GexCore/USB/usbd_conf.c \
+    GexCore/USB/usbd_desc.c \
+    GexCore/USB/STM32_USB_Device_Library/Class/CDC/Src/usbd_cdc.c \
+    GexCore/USB/STM32_USB_Device_Library/Class/MSC_CDC/usbd_msc_cdc.c \
+    GexCore/USB/STM32_USB_Device_Library/Core/Src/usbd_core.c \
+    GexCore/USB/STM32_USB_Device_Library/Core/Src/usbd_ctlreq.c \
+    GexCore/USB/STM32_USB_Device_Library/Core/Src/usbd_ioreq.c \
+    Src/platform_resources.c

-GEX_CDEFS = $(GEX_CDEFS_BASE) \
+GEX_C_INCLUDES = \
+    -IGexUnits \
+    -IGexCore \
+    -IGexCore/USB \
+    -IGexCore/USB/MSC_CDC \
+    -IGexCore/TinyFrame \
+    -IGexCore/vfs \
+    -IGexCore/utils \
+    -IGexCore/units \
+    -IGexCore/framework \
+    -IGexCore/platform \
+    -IGexCore/tasks \
+    -IGexCore/USB/STM32_USB_Device_Library/Core/Inc \
+    -IGexCore/USB/STM32_USB_Device_Library/Class/AUDIO/Inc \
+    -IGexCore/USB/STM32_USB_Device_Library/Class/CDC/Inc \
+    -IGexCore/USB/STM32_USB_Device_Library/Class/CustomHID/Inc \
+    -IGexCore/USB/STM32_USB_Device_Library/Class/DFU/Inc \
+    -IGexCore/USB/STM32_USB_Device_Library/Class/HID/Inc \
+    -IGexCore/USB/STM32_USB_Device_Library/Class/MSC/Inc \
+    -IGexCore/USB/STM32_USB_Device_Library/Class/MSC_CDC
+
+GEX_C_FLAGS := \
+    -DGEX_PLAT_$(GEX_PLAT) \
+    -D__weak="__attribute__((weak))" \
+    -D__packed="__attribute__((__packed__))" \
+    $(GEX_UNIT_DEFS)
+
+# Option to disable debug
+ifeq '$(DISABLE_DEBUG)' '1'
+GEX_C_FLAGS += \
    -DUSE_FULL_ASSERT=0 \
    -DASSERT_FILENAMES=0 \
    -DDEBUG_VFS=0 \
@ -85,45 +125,177 @@ GEX_CDEFS = $(GEX_CDEFS_BASE) \
    -DUSE_DEBUG_UART=0 \
    -DDEBUG_MALLOC=0 \
    -DDEBUG_RSC=0
-
 else
-
-GEX_CDEFS = $(GEX_CDEFS_BASE) \
+GEX_C_FLAGS += \
    -DUSE_FULL_ASSERT=1 \
    -DASSERT_FILENAMES=1 \
    -DDEBUG_VFS=0 \
    -DDEBUG_FLASH_WRITE=0 \
    -DVERBOSE_HARDFAULT=1 \
-    -DUSE_STACK_MONITOR=1 \
+    -DUSE_STACK_MONITOR=0 \
    -DUSE_DEBUG_UART=1 \
    -DDEBUG_MALLOC=0 \
    -DDEBUG_RSC=0
-
 endif


+# Option to disable mass storage
 ifeq '$(DISABLE_MSC)' '1'
+GEX_C_FLAGS += -DDISABLE_MSC
+else
+GEX_C_FILES += \
+    GexCore/USB/usbd_storage_if.c \
+    GexCore/USB/STM32_USB_Device_Library/Class/MSC/Src/usbd_msc.c \
+    GexCore/USB/STM32_USB_Device_Library/Class/MSC/Src/usbd_msc_bot.c \
+    GexCore/USB/STM32_USB_Device_Library/Class/MSC/Src/usbd_msc_data.c \
+    GexCore/USB/STM32_USB_Device_Library/Class/MSC/Src/usbd_msc_scsi.c
+GEX_C_DIRS += \
+    GexCore/vfs
+endif

-GEX_CDEFS += -DDISABLE_MSC

-else
+# Option to enable CDC loopback (testing USB)
+ifeq '$(CDC_LOOPBACK_TEST)' '1'
+GEX_C_FLAGS += -DCDC_LOOPBACK_TEST=1
+endif

-GEX_SOURCES += \
-    User/USB/usbd_storage_if.c \
-    User/USB/STM32_USB_Device_Library/Class/MSC/Src/usbd_msc.c \
-    User/USB/STM32_USB_Device_Library/Class/MSC/Src/usbd_msc_bot.c \
-    User/USB/STM32_USB_Device_Library/Class/MSC/Src/usbd_msc_data.c \
-    User/USB/STM32_USB_Device_Library/Class/MSC/Src/usbd_msc_scsi.c

-GEX_SRC_DIR += \
-    User/vfs
+#####################################################
+# Common build infrastructure
+#####################################################

-endif
+# Build path
+BUILD_DIR = build
+# target
+TARGET = firmware
+# Specs (determines which stdlib version is included)
+SPECS = nano.specs

-ifeq '$(DISABLE_TEST_UNIT)' '1'
-GEX_CDEFS += -DDISABLE_TEST_UNIT=1
-endif
+C_SOURCES := \
+    $(COMMON_C_FILES) $(PLAT_C_FILES) $(GEX_C_FILES) \
+    $(foreach x,$(COMMON_C_DIRS),$(wildcard $(x)/*.c)) \
+    $(foreach x,$(PLAT_C_DIRS),$(wildcard $(x)/*.c)) \
+    $(foreach x,$(GEX_C_DIRS),$(wildcard $(x)/*.c)) \

-ifeq '$(CDC_LOOPBACK_TEST)' '1'
-GEX_CDEFS += -DCDC_LOOPBACK_TEST=1
+AS_SOURCES := \
+    $(COMMON_AS_FILES) $(PLAT_AS_FILES) $(GEX_AS_FILES) 
+    $(foreach x,$(COMMON_AS_DIRS),$(wildcard $(x)/*.s)) \
+    $(foreach x,$(PLAT_AS_DIRS),$(wildcard $(x)/*.s)) \
+    $(foreach x,$(GEX_AS_DIRS),$(wildcard $(x)/*.s))
+
+# mcu
+MCU := $(PLAT_CPU) -mthumb $(PLAT_FPU) $(PLAT_FLOAT-ABI)
+
+#######################################
+# binaries
+#######################################
+BINPATH = /usr/bin
+PREFIX = arm-none-eabi-
+CC := $(BINPATH)/$(PREFIX)gcc
+AS := $(BINPATH)/$(PREFIX)gcc -x assembler-with-cpp
+CP := $(BINPATH)/$(PREFIX)objcopy
+AR := $(BINPATH)/$(PREFIX)ar
+SZ := $(BINPATH)/$(PREFIX)size
+HEX := $(CP) -O ihex
+BIN := $(CP) -O binary -S
+
+
+LIBS = -lc -lm -lnosys
+LDFLAGS := \
+    $(MCU) -specs=$(SPECS) -T$(PLAT_LDSCRIPT) $(LIBS) \
+    -Wl,-Map=$(BUILD_DIR)/$(TARGET).map,--cref \
+    -Wl,--gc-sections
+
+# optimization (possible to set in build.mk)
+ifeq ($(OPT),)
+OPT = -Os
 endif
+
+C_FLAGS := \
+    $(MCU) $(OPT) \
+    $(GEX_C_INCLUDES) $(PLAT_C_INCLUDES) $(COMMON_C_INCLUDES) \
+    $(GEX_C_FLAGS) $(PLAT_C_FLAGS) $(COMMON_C_FLAGS)
+
+AS_FLAGS := \
+    $(MCU) $(OPT) \
+    $(GEX_AS_INCLUDES) $(PLAT_AS_INCLUDES) $(COMMON_AS_INCLUDES) \
+    $(GEX_AS_FLAGS) $(PLAT_AS_FLAGS) $(COMMON_AS_FLAGS)
+
+
+# Generate dependency information
+DEPENDENCY_TRACKER = -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@:%.o=%.d)"
+
+
+#######################################
+# Targets
+#######################################
+
+# # list of objects
+# OBJECTS = $(addprefix $(BUILD_DIR)/,$(notdir $(C_SOURCES:.c=.o)))
+# vpath %.c $(sort $(dir $(C_SOURCES)))
+# # list of ASM program objects
+# OBJECTS += $(addprefix $(BUILD_DIR)/,$(notdir $(AS_SOURCES:.s=.o)))
+# vpath %.s $(sort $(dir $(AS_SOURCES)))
+
+# list of objects
+OBJECTS := $(addprefix $(BUILD_DIR)/,$(C_SOURCES:.c=.o)) \
+           $(addprefix $(BUILD_DIR)/,$(AS_SOURCES:.s=.o))
+
+vpath %.c $(sort $(dir $(C_SOURCES)))
+vpath %.s $(sort $(dir $(AS_SOURCES)))
+
+MAKEFILES = Makefile GexCore/gex.mk build.mk
+
+# default action: build all
+all: $(BUILD_DIR)/$(TARGET).elf $(BUILD_DIR)/$(TARGET).hex $(BUILD_DIR)/$(TARGET).bin
+
+$(BUILD_DIR)/%.o: %.c $(MAKEFILES) | $(BUILD_DIR)
+	@echo -e "\x1b[32mCC\x1b[m $<\n  \x1b[90m-> $@\x1b[m"
+	@mkdir -p `dirname "$(BUILD_DIR)/$(<)"`
+	@$(CC) -c $(C_FLAGS) $(DEPENDENCY_TRACKER) -Wa,-a,-ad,-alms=$(BUILD_DIR)/$(<:.c=.lst) $< -o $@
+
+$(BUILD_DIR)/%.o: %.s $(MAKEFILES) | $(BUILD_DIR)
+	@$(AS) -c $(C_FLAGS) $(DEPENDENCY_TRACKER) $< -o $@
+
+$(BUILD_DIR)/$(TARGET).elf: $(OBJECTS) $(MAKEFILES)
+	@printf "LD $< -> $@\n"
+	$(CC) $(OBJECTS) $(LDFLAGS) -o $@
+	@$(SZ) $@
+
+$(BUILD_DIR)/%.hex: $(BUILD_DIR)/%.elf $(MAKEFILES) | $(BUILD_DIR)
+	@printf "OBJDUMP $< -> $(BUILD_DIR)/$(TARGET).hex \n"
+	@$(HEX) $< $@
+
+$(BUILD_DIR)/%.bin: $(BUILD_DIR)/%.elf $(MAKEFILES) | $(BUILD_DIR)
+	@printf "OBJDUMP $< -> $(BUILD_DIR)/$(TARGET).bin \n"
+	@$(BIN) $< $@
+
+flash: $(BUILD_DIR)/$(TARGET).bin $(MAKEFILES)
+	@printf "FLASH  $<\n"
+	@st-flash write $< 0x8000000
+
+$(BUILD_DIR)/$(TARGET).dfu: $(BUILD_DIR)/$(TARGET).hex $(MAKEFILES)
+	@printf "DFU GEN  $<\n"
+	dfu-convert -i $< $@
+
+dfu: $(BUILD_DIR)/$(TARGET).dfu $(MAKEFILES)
+	@printf "DFU UPLOAD  $<\n"
+	dfu-util -a 0 -D $<
+
+dis: $(BUILD_DIR)/$(TARGET).elf $(MAKEFILES)
+	@printf "DIS $<\n"
+	@arm-none-eabi-objdump -Sslrtd build/$(TARGET).elf > disassembly.lst
+
+$(BUILD_DIR):
+	@mkdir -p $@
+
+#######################################
+# clean up
+#######################################
+clean:
+	-rm -fR .dep $(BUILD_DIR)
+
+#######################################
+# dependencies
+#######################################
+-include $(shell mkdir .dep 2>/dev/null) $(wildcard .dep/*)
--- a/gex_hooks.c
+++ b/gex_hooks.c
@ -10,12 +10,18 @@
 #include "platform/debug_uart.h"
 #include "gex_hooks.h"
 #include "unit_registry.h"
+#include "comm/interfaces.h"
+#include "system_settings.h"

 /**
 * This is a systick callback for GEX application logic
 */
 void GEX_MsTick(void)
 {
+    if (gActiveComport == COMPORT_USART) {
+        com_iface_flush_buffer();
+    }
+
    TF_Tick(comm);
    Indicator_Tick();
    ureg_tick_units();
@ -26,6 +32,11 @@ void GEX_MsTick(void)
 */
 void GEX_PreInit(void)
 {
+    // this is a hack to make logging of the initial messages work
+    // it's problematic because we shouldn't even enable the debug uart if it's disabled in the system settings
+    // TODO move system settings load earlier and check the uart flag in advance
+    SystemSettings.enable_debug_uart = true;
+
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();
    __HAL_RCC_GPIOC_CLK_ENABLE();
--- a/platform/cfg_utils.c
+++ b/platform/cfg_utils.c
@ -297,3 +297,46 @@ uint32_t cfg_enum4_parse(const char *value,
    *suc = false;
    return na;
 }
+
+void cfg_hex_parse(uint8_t *dest, uint32_t count, const char *value, bool *suc)
+{
+    // discard possible leading 0x
+    if (value[0] == '0' && value[1] == 'x') {
+        value += 2;
+    }
+
+    uint8_t bytebuf = 0;
+    for (uint32_t digit = 0; digit < count * 2;) {
+        char v = *value;
+        if (v != 0) value++;
+
+        uint8_t nibble = 0;
+        if (v == ' ' || v == '.' || v == ',' || v == '-' || v == ':') {
+            continue; // junk
+        }
+        else if (v >= '0' && v <= '9') {
+            nibble = (uint8_t) (v - '0');
+        }
+        else if (v >= 'a' && v <= 'f') {
+            nibble = (uint8_t) (10 + (v - 'a'));
+        }
+        else if (v >= 'A' && v <= 'F') {
+            nibble = (uint8_t) (10 + (v - 'A'));
+        }
+        else if (v == 0) {
+            nibble = 0; // pad with zeros
+        }
+        else {
+            *suc = false;
+            return;
+        }
+
+        digit++;
+        bytebuf <<= 4;
+        bytebuf |= nibble;
+        if ((digit % 2 == 0) && digit > 0) { // whole byte
+            *dest++ = bytebuf;
+            bytebuf = 0;
+        }
+    }
+}
--- a/platform/cfg_utils.h
+++ b/platform/cfg_utils.h
@ -2,8 +2,8 @@
 // Created by MightyPork on 2018/02/23.
 //

-#ifndef GEX_F072_CFG_UTILS_H
-#define GEX_F072_CFG_UTILS_H
+#ifndef GEX_CORE_CFG_UTILS_H
+#define GEX_CORE_CFG_UTILS_H

 #include "platform.h"
 #include "rsc_enum.h"
@ -116,6 +116,18 @@ uint32_t cfg_enum4_parse(const char *tpl,
                         const char *d, uint32_t nd,
                         bool *suc);

+/**
+ * Parse a hexa string to a byte array.
+ * Skips 0x prefix, '.', '-', ':', ' '.
+ *
+ * @param[out] dest - storage array
+ * @param[in] count - expected number of bytes
+ * @param[in] value - parsed string
+ * @param[out] suc - success flag
+ */
+void cfg_hex_parse(uint8_t *dest, uint32_t count,
+                   const char *value, bool *suc);
+
 /** Convert bool to a Y or N constant string */
 #define str_yn(cond) ((cond) ? ("Y") : ("N"))

@ -150,4 +162,4 @@ static inline int32_t cfg_i32_parse(const char *value, bool *suc)
    return (int32_t) avr_atoi(value);
 }

-#endif //GEX_F072_CFG_UTILS_H
+#endif //GEX_CORE_CFG_UTILS_H
--- a/platform/debug_uart.c
+++ b/platform/debug_uart.c
@ -5,65 +5,31 @@
 #include "platform.h"
 #include "framework/resources.h"
 #include "debug_uart.h"
-#include "plat_compat.h"
 #include "hw_utils.h"
+#include "framework/system_settings.h"

 #if USE_DEBUG_UART

-#define DEBUG_USART_BAUD 115200
-
-#if GEX_PLAT_F072_DISCOVERY
-
-    #define DEBUG_USART USART1
-    #define DEBUG_USART_RSC R_USART1
-    #define DEBUG_USART_PORT 'A'
-    #define DEBUG_USART_PIN  9
-    #define DEBUG_USART_AF  1
-    #define DEBUG_USART_PCLK PLAT_APB1_HZ
-
-#elif GEX_PLAT_F103_BLUEPILL
-
-    #define DEBUG_USART USART2
-    #define DEBUG_USART_RSC R_USART2
-    #define DEBUG_USART_PORT 'A'
-    #define DEBUG_USART_PIN  2
-    #define DEBUG_USART_PCLK PLAT_APB1_HZ
-
-#elif GEX_PLAT_F303_DISCOVERY
-
-    #define DEBUG_USART USART3
-    #define DEBUG_USART_RSC R_USART3
-    #define DEBUG_USART_PORT 'D'
-    #define DEBUG_USART_PIN  8
-    #define DEBUG_USART_AF  7
-    #define DEBUG_USART_PCLK PLAT_APB1_HZ
-
-#elif GEX_PLAT_F407_DISCOVERY
-
-    #define DEBUG_USART USART2
-    #define DEBUG_USART_RSC R_USART2
-    #define DEBUG_USART_PORT 'A'
-    #define DEBUG_USART_PIN  2
-    #define DEBUG_USART_AF  7
-    #define DEBUG_USART_PCLK PLAT_APB1_HZ
-
-#else
-    #error "BAD PLATFORM!"
-#endif
-
-
+static bool debug_uart_inited = false;
+static bool debug_uart_preinited = false;

 /** Init the submodule. */
 void DebugUart_Init(void)
 {
+    if (debug_uart_inited) return;
+    if (!debug_uart_preinited) DebugUart_PreInit();
    // Debug UART
    assert_param(E_SUCCESS == rsc_claim(&UNIT_SYSTEM, DEBUG_USART_RSC));
    assert_param(E_SUCCESS == rsc_claim_pin(&UNIT_SYSTEM, DEBUG_USART_PORT, DEBUG_USART_PIN));
+
+    debug_uart_inited = true;
 }

 /** Init the hardware peripheral - this is called early in the boot process */
 void DebugUart_PreInit(void)
 {
+    debug_uart_preinited = true;
+
    // configure AF only if platform uses AF numbers
 #if !PLAT_NO_AFNUM
 #pragma GCC diagnostic push
@ -89,8 +55,35 @@ void DebugUart_PreInit(void)
    LL_USART_Enable(DEBUG_USART);
 }

+void DebugUart_Teardown(void)
+{
+    if (!debug_uart_inited) return;
+
+    dbg("Disabling debug UART!");
+
+    // TODO wait for Tx (after debug print DMA is implemented)
+
+    LL_USART_Disable(DEBUG_USART);
+    rsc_free(&UNIT_SYSTEM, DEBUG_USART_RSC);
+    hw_periph_clock_disable(DEBUG_USART);
+
+    bool suc = true;
+    Resource r = rsc_portpin2rsc(DEBUG_USART_PORT, DEBUG_USART_PIN, &suc);
+    rsc_free(&UNIT_SYSTEM, r);
+    hw_deinit_pin_rsc(r);
+
+    debug_uart_preinited = false;
+    debug_uart_inited = false;
+
+    assert_param(suc);
+}
+
 void debug_write(const char *buf, uint16_t len)
 {
+    if (!SystemSettings.enable_debug_uart) return;
+
+    // TODO wait for DMA complete
+    // TODO use DMA
    for (uint16_t i = 0; i < len; i++) {
        while (!LL_USART_IsActiveFlag_TC(DEBUG_USART));
        LL_USART_TransmitData8(DEBUG_USART, (uint8_t) *buf++);
--- a/platform/debug_uart.h
+++ b/platform/debug_uart.h
@ -8,6 +8,8 @@
 #ifndef GEX_DEBUG_UART_H
 #define GEX_DEBUG_UART_H

+#include "platform.h"
+
 /**
 * Pre-init the debug uart
 *
@ -17,7 +19,13 @@
 void DebugUart_PreInit(void);

 /**
- * Finalize the init (claim resources)
+ * Release the peripheral and deinit pin
+ */
+void DebugUart_Teardown(void);
+
+/**
+ * Finalize the init (claim resources).
+ * If not pre-inited (i.e. Teardown was called before), also pre-init.
 */
 void DebugUart_Init(void);

--- a/platform/hw_utils.c
+++ b/platform/hw_utils.c
@ -99,12 +99,17 @@ void hw_deinit_unit_pins(Unit *unit)
 {
    for (uint32_t rsc = R_PA0; rsc <= R_PF15; rsc++) {
        if (RSC_IS_HELD(unit->resources, (Resource)rsc)) {
+            hw_deinit_pin_rsc((Resource)rsc);
+        }
+    }
+}
+
+void hw_deinit_pin_rsc(Resource rsc)
+{
    rsc_dbg("Freeing pin %s", rsc_get_name((Resource)rsc));
    GPIO_TypeDef *port = GPIO_PERIPHS[(rsc-R_PA0) / 16];
    uint32_t ll_pin = LL_GPIO_PINS[(rsc-R_PA0)%16];
    LL_GPIO_SetPinMode(port, ll_pin, LL_GPIO_MODE_ANALOG);
-        }
-    }
 }

 /** Configure a pin to alternate function */
@ -263,7 +268,7 @@ void hw_periph_clock_enable(void *periph)
    else if (periph == TIM5) __HAL_RCC_TIM5_CLK_ENABLE();
 #endif
 #ifdef TIM6
-    else if (periph == TIM6) __HAL_RCC_TIM7_CLK_ENABLE();
+    else if (periph == TIM6) __HAL_RCC_TIM6_CLK_ENABLE();
 #endif
 #ifdef TIM7
    else if (periph == TIM7) __HAL_RCC_TIM7_CLK_ENABLE();
@ -374,7 +379,7 @@ void hw_periph_clock_disable(void *periph)
    else if (periph == TIM5) __HAL_RCC_TIM5_CLK_DISABLE();
 #endif
 #ifdef TIM6
-    else if (periph == TIM6) __HAL_RCC_TIM7_CLK_DISABLE();
+    else if (periph == TIM6) __HAL_RCC_TIM6_CLK_DISABLE();
 #endif
 #ifdef TIM7
    else if (periph == TIM7) __HAL_RCC_TIM7_CLK_DISABLE();
--- a/platform/hw_utils.h
+++ b/platform/hw_utils.h
@ -40,6 +40,8 @@ GPIO_TypeDef *hw_port2periph(char port_name, bool *suc);
 */
 bool hw_pinrsc2ll(Resource rsc, GPIO_TypeDef **port, uint32_t *llpin) __attribute__((warn_unused_result));

+void hw_deinit_pin_rsc(Resource rsc);
+
 /**
 * Spread packed port pins using a mask
 *
--- a/platform/irq_dispatcher.c
+++ b/platform/irq_dispatcher.c
@ -113,7 +113,7 @@ void irqd_init(void)
 //    NVIC_EnableIRQ(TIM3_IRQn);                  /*!< TIM3 global Interrupt                                           */

    NVIC_EnableIRQ(TIM6_DAC_IRQn);              /*!< TIM6 global and DAC channel underrun error Interrupt            */
-    HAL_NVIC_SetPriority(TIM7_IRQn, 2, 0); // Used for DAC timing
+    HAL_NVIC_SetPriority(TIM6_DAC_IRQn, 2, 0); // Used for DAC timing

    NVIC_EnableIRQ(TIM7_IRQn);                  /*!< TIM7 global Interrupt                                           */
    HAL_NVIC_SetPriority(TIM7_IRQn, 2, 0);// this will be for dac (?)
@ -246,7 +246,12 @@ void* irqd_detach(void *periph, IrqCallback callback)

        return oldArg;
    } else {
+        // catch bugs, but ignore an attempt to unbind when not bound
+        if (slot->callback != NULL) {
            trap("Detach IRQ %p() from %p but %p() bound instead", callback, periph, slot->callback);
+        } else {
+            return NULL; // the arg - none
+        }
    }
 }

--- a/platform/irq_dispatcher.h
+++ b/platform/irq_dispatcher.h
@ -4,8 +4,8 @@
 // Provides a trampoline system for redirecting IRQ calls to assigned callbacks.
 //

-#ifndef GEX_F072_IRQ_DISPATCHER_H
-#define GEX_F072_IRQ_DISPATCHER_H
+#ifndef GEX_CORE_IRQ_DISPATCHER_H
+#define GEX_CORE_IRQ_DISPATCHER_H

 // Dummy peripherals for use with the
 extern void * const EXTIS[16];
@ -42,4 +42,4 @@ void irqd_attach(void *periph, IrqCallback callback, void *data);
 */
 void* irqd_detach(void *periph, IrqCallback callback);

-#endif //GEX_F072_IRQ_DISPATCHER_H
+#endif //GEX_CORE_IRQ_DISPATCHER_H
--- a/platform/ll_extension.h
+++ b/platform/ll_extension.h
@ -2,8 +2,8 @@
 // Created by MightyPork on 2018/02/04.
 //

-#ifndef GEX_F072_LL_EXTENSION_H
-#define GEX_F072_LL_EXTENSION_H
+#ifndef GEX_CORE_LL_EXTENSION_H
+#define GEX_CORE_LL_EXTENSION_H

 #include "platform.h"

@ -57,4 +57,4 @@ static inline void LL_DMA_ClearFlags(DMA_TypeDef *DMAx, uint8_t channel)
 }


-#endif //GEX_F072_LL_EXTENSION_H
+#endif //GEX_CORE_LL_EXTENSION_H
--- a/platform/lock_jumper.c
+++ b/platform/lock_jumper.c
@ -42,7 +42,11 @@ void LockJumper_Init(void)
        LL_GPIO_SetPinPull(lock_periph, lock_llpin, LL_GPIO_PULL_UP);
    #endif

-    SystemSettings.editable = (bool) LL_GPIO_IsInputPinSet(lock_periph, lock_llpin);
+#if PLAT_LOCK_BTN
+    SystemSettings.editable = false;
+#else
+    SystemSettings.editable = (PLAT_LOCK_1CLOSED != LL_GPIO_IsInputPinSet(lock_periph, lock_llpin));
+#endif
    dbg("Settings editable? %d", SystemSettings.editable);
 }

--- a/platform/lock_jumper.h
+++ b/platform/lock_jumper.h
@ -7,8 +7,6 @@
 #ifndef GEX_LOCK_JUMPER_H
 #define GEX_LOCK_JUMPER_H

-#include "plat_compat.h"
-
 /**
 * Init the lock jumper subsystem
 */
--- a/platform/plat_config.h
+++ b/platform/plat_config.h
@ -0,0 +1,64 @@
+//
+// Created by MightyPork on 2018/07/07.
+//
+
+#ifndef GEX_CORE_PLAT_CONFIG_H
+#define GEX_CORE_PLAT_CONFIG_H
+
+#define VFS_DRIVE_NAME "GEX"
+
+// -------- Priorities -------------
+#define TSK_MAIN_PRIO osPriorityNormal
+#define TSK_JOBS_PRIO osPriorityHigh
+#define TSK_TIMERS_PRIO 4 // this must be in the 0-7 range
+
+// -------- Static buffers ---------
+// USB / VFS task stack size
+#if DISABLE_MSC
+#define TSK_STACK_MAIN      100 // without MSC the stack usage is significantly lower
+#else
+#define TSK_STACK_MAIN      160
+#endif
+
+// 180 is normally enough if not doing extensive debug logging
+#define TSK_STACK_MSG       220 // TF message handler task stack size (all unit commands run on this thread)
+#define TSK_STACK_IDLE    64 //configMINIMAL_STACK_SIZE
+#define TSK_STACK_TIMERS  64 //configTIMER_TASK_STACK_DEPTH
+
+#define PLAT_HEAP_SIZE 4096
+
+
+
+#define BULK_READ_BUF_LEN 256   // Buffer for TF bulk reads
+#define UNIT_TMP_LEN      256   // Buffer for internal unit operations
+
+#define FLASH_SAVE_BUF_LEN  128 // Malloc'd buffer for saving to flash
+
+#define MSG_QUE_SLOT_SIZE 64 // FIXME this should be possible to lower, but there's some bug with bulk transfer / INI parser
+#define RX_QUE_CAPACITY    16 // TinyFrame rx queue size (64 bytes each)
+
+#define TF_MAX_PAYLOAD_RX 512 // TF max Rx payload
+#define TF_SENDBUF_LEN    512 // TF transmit buffer (can be less than a full frame)
+
+#define TF_MAX_ID_LST   4 // Frame ID listener count
+#define TF_MAX_TYPE_LST 6 // Frame Type listener count
+#define TF_MAX_GEN_LST  1 // Generic listener count
+
+#define USBD_MAX_STR_DESC_SIZ   64 // Descriptor conversion buffer (used for converting ASCII to UTF-16, must be 2x the size of the longest descriptor)
+#define MSC_MEDIA_PACKET       512 // Mass storage sector size (packet)
+
+#define INI_KEY_MAX    20 // Ini parser key buffer
+#define INI_VALUE_MAX  30 // Ini parser value buffer
+
+// -------- Stack buffers ----------
+#define DBG_BUF_LEN      100 // Size of the snprintf buffer for debug messages
+#define ERR_MSG_STR_LEN  64 // Error message buffer size
+#define IWBUFFER_LEN     80 // Ini writer buffer for sprintf
+
+// -------- Timeouts ------------
+#define TF_PARSER_TIMEOUT_TICKS 100 // Timeout for receiving & parsing a frame
+#define BULK_LST_TIMEOUT_MS     2000 // timeout for the bulk transaction to expire
+#define MSG_QUE_POST_TIMEOUT    200 // Time to post to the messages / jobs queue
+
+
+#endif //GEX_CORE_PLAT_CONFIG_H
--- a/platform/platform.c
+++ b/platform/platform.c
@ -7,242 +7,37 @@
 #include "USB/usb_device.h"
 #include "framework/resources.h"
 #include "framework/unit_registry.h"
-#include "units/digital_out/unit_dout.h"
-
-#include "units/digital_in/unit_din.h"
-#include "units/neopixel/unit_neopixel.h"
-#include "units/i2c/unit_i2c.h"
-#include "units/1wire/unit_1wire.h"
-#include "units/adc/unit_adc.h"
-#include "units/test/unit_test.h"
-#include "units/usart/unit_usart.h"
-#include "units/spi/unit_spi.h"
-#include "units/sipo/unit_sipo.h"
-#include "units/fcap/unit_fcap.h"
-#include "units/touch/unit_touch.h"
-#include "units/simple_pwm/unit_pwmdim.h"
+#include "comm/interfaces.h"
 #include "hw_utils.h"

+#include "units_manifest.h"
+
+extern uint32_t plat_init_resources2(void);
+
+// TODO split this and the plat_compat files to per-platform ones stored in the platform project
+
 void plat_init_resources(void)
 {
+    // we use |= here, even though return values are not booleans - success is 0,
+    // thus any problem results in nonzero and the assert will trip.
    uint32_t rv = 0;

-    // enable clock for units we use
+    // periphs available everywhere - enable clock
    hw_periph_clock_enable(DMA1);
 #ifdef DMA2
    hw_periph_clock_enable(DMA2);
 #endif

-    // --- Common unit drivers ---
-
-    #if HAVE_TEST_UNIT
-        ureg_add_type(&UNIT_TEST);
-    #endif
+    // EXTI are always available
+    rsc_free_range(NULL, R_EXTI0, R_EXTI15);

    // --- platform specific resource releases and claims ---

-#if defined(GEX_PLAT_F103_BLUEPILL)
-    // Platform STM32F103C8T6 Bluepill ($4 board from eBay)
-
-    // Units supported by the platform (known to work correctly)
-
-    // free all present resources
-    {
-        rsc_free_range(NULL, R_ADC1, R_ADC2);
-        rsc_free_range(NULL, R_I2C1, R_I2C2);
-        rsc_free_range(NULL, R_SPI1, R_SPI2);
-        rsc_free_range(NULL, R_TIM1, R_TIM4);
-        rsc_free_range(NULL, R_USART1, R_USART3);
-        rsc_free_range(NULL, R_PA0, R_PA15);
-        rsc_free_range(NULL, R_PB0, R_PB15);
-        rsc_free_range(NULL, R_PC13, R_PC15);
-        rsc_free_range(NULL, R_PD0, R_PD1);
-    }
-
-    // Claim resources not available due to board layout or internal usage
-    {
-        // HAL timebase
-        rv |= rsc_claim(&UNIT_SYSTEM, R_TIM1);
-        // HSE crystal
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PD0);
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PD1);
-        // SWD
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA13);
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA14);
-        // USB
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA11);
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA12);
-        // BOOT pin(s)
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PB2); // BOOT1
-    }
-#elif defined(GEX_PLAT_F072_DISCOVERY)
-    // Platform STM32F073RBT
-
-    // Additional GPIO ports
-    __HAL_RCC_GPIOF_CLK_ENABLE();
-
-    // Units supported by the platform (known to work correctly)
-    ureg_add_type(&UNIT_DOUT);
-    ureg_add_type(&UNIT_DIN);
-    ureg_add_type(&UNIT_NEOPIXEL);
-    ureg_add_type(&UNIT_I2C);
-    ureg_add_type(&UNIT_SPI);
-    ureg_add_type(&UNIT_USART);
-    ureg_add_type(&UNIT_1WIRE);
-    ureg_add_type(&UNIT_ADC);
-    ureg_add_type(&UNIT_SIPO);
-    ureg_add_type(&UNIT_FCAP);
-    ureg_add_type(&UNIT_TOUCH);
-    ureg_add_type(&UNIT_PWMDIM);
-
-    // Free all present resources
-    {
-        rsc_free(NULL, R_ADC1);
-//        rsc_free(NULL, R_CAN1);
-//        rsc_free_range(NULL, R_COMP1, R_COMP2);
-        rsc_free(NULL, R_DAC1);
-//        rsc_free(NULL, R_HDMI_CEC);
-        rsc_free(NULL, R_TSC);
-        rsc_free_range(NULL, R_I2C1, R_I2C2);
-//        rsc_free_range(NULL, R_I2S1, R_I2S2);
-        rsc_free_range(NULL, R_SPI1, R_SPI2);
-        rsc_free_range(NULL, R_TIM1, R_TIM3);
-        rsc_free_range(NULL, R_TIM6, R_TIM7);
-        rsc_free_range(NULL, R_TIM14, R_TIM17);
-        rsc_free_range(NULL, R_USART1, R_USART4);
-        rsc_free_range(NULL, R_DMA1_1, R_DMA1_7);
-
-        rsc_free_range(NULL, R_PA0, R_PA15);
-        rsc_free_range(NULL, R_PB0, R_PB15);
-        rsc_free_range(NULL, R_PC0, R_PC15);
-        rsc_free(NULL, R_PD2);
-        rsc_free_range(NULL, R_PF0, R_PF1);
-    }
-
-    // Claim resources not available due to board layout or internal usage
-    {
-        // HAL timebase
-        rv |= rsc_claim(&UNIT_SYSTEM, R_TIM1);
-        // HSE crystal
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PF0);
-        //rv |= rsc_claim(&UNIT_SYSTEM, R_PF1); // - not used in BYPASS mode
-        // SWD
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA13);
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA14);
-        // USB
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA11);
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA12);
-        // BOOT pin(s)
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PB2); // BOOT1
-    }
-#elif defined(GEX_PLAT_F303_DISCOVERY)
-    // Platform STM32F303VCT
-
-    // Additional GPIO ports
-    __HAL_RCC_GPIOF_CLK_ENABLE();
-
    // Units supported by the platform (known to work correctly)
-    // ureg_add_type(&UNIT_XYZ);
-
-    // Free all present resources
-    {
-        rsc_free_range(NULL, R_ADC1, R_ADC4);
-//        rsc_free(NULL, R_CAN1);
-//        rsc_free_range(NULL, R_COMP1, R_COMP7);
-//        rsc_free(NULL, R_HDMI_CEC);
-        rsc_free(NULL, R_DAC1);
-        rsc_free_range(NULL, R_I2C1, R_I2C2);
-        rsc_free_range(NULL, R_I2S2, R_I2S3);
-//        rsc_free_range(NULL, R_OPAMP1, R_OPAMP4);
-        rsc_free_range(NULL, R_SPI1, R_SPI3);
-        rsc_free_range(NULL, R_TIM1, R_TIM4);
-        rsc_free_range(NULL, R_TIM6, R_TIM8);
-        rsc_free_range(NULL, R_TIM15, R_TIM17);
-        rsc_free(NULL, R_TSC);
-        rsc_free_range(NULL, R_USART1, R_USART5);
-
-        rsc_free_range(NULL, R_PA0, R_PA15);
-        rsc_free_range(NULL, R_PB0, R_PB15);
-        rsc_free_range(NULL, R_PC0, R_PC15);
-        rsc_free_range(NULL, R_PD0, R_PD15);
-        rsc_free_range(NULL, R_PE0, R_PE15);
-
-        rsc_free_range(NULL, R_PF0, R_PF2);
-        rsc_free(NULL, R_PF4);
-        rsc_free_range(NULL, R_PF9, R_PF10);
-    }
-
-    // Claim resources not available due to board layout or internal usage
-    {
-        // HAL timebase
-        rv |= rsc_claim(&UNIT_SYSTEM, R_TIM1);
-        // HSE crystal
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PF0);
-        //rv |= rsc_claim(&UNIT_SYSTEM, R_PF1); // - not used in BYPASS mode
-        // SWD
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA13);
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA14);
-        // USB
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA11);
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA12);
-        // BOOT pin(s)
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PB2); // BOOT1
-    }
-#elif defined(GEX_PLAT_F407_DISCOVERY)
-    // Platform STM32F407VGT
-
-    // Additional GPIO ports
-    __HAL_RCC_GPIOF_CLK_ENABLE();
-
-    // Units supported by the platform (known to work correctly)
-    // ureg_add_type(&UNIT_XYZ);
-
-    // Free all present resources
-    {
-        rsc_free_range(NULL, R_ADC1, R_ADC3);
-//        rsc_free_range(NULL, R_CAN1, R_CAN2);
-//        rsc_free_range(NULL, R_COMP1, R_COMP7);
-        rsc_free(NULL, R_DAC1);
-//        rsc_free(NULL, R_DCMI);
-//        rsc_free(NULL, R_ETH);
-//        rsc_free(NULL, R_FSMC);
-        rsc_free_range(NULL, R_I2C1, R_I2C3);
-        rsc_free_range(NULL, R_I2S2, R_I2S3);
-//        rsc_free(NULL, R_SDIO);
-        rsc_free_range(NULL, R_SPI1, R_SPI3);
-        rsc_free_range(NULL, R_TIM1, R_TIM14);
-        rsc_free_range(NULL, R_USART1, R_USART3);
-        rsc_free(NULL, R_USART6);
-
-        rsc_free_range(NULL, R_PA0, R_PA15);
-        rsc_free_range(NULL, R_PB0, R_PB15);
-        rsc_free_range(NULL, R_PC0, R_PC15);
-        rsc_free_range(NULL, R_PD0, R_PD15);
-        rsc_free_range(NULL, R_PE0, R_PE15);
-        // also has 2 PH pins
-
-        // F407 appears to have fewer GPIOs than F303?
-    }
-
-    // Claim resources not available due to board layout or internal usage
-    {
-        // HAL timebase
-        rv |= rsc_claim(&UNIT_SYSTEM, R_TIM1);
-        // HSE crystal
-        // H0 and H1
-        // SWD
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA13);
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA14);
-        // USB
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA11);
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PA12);
-        // BOOT pin(s)
-        rv |= rsc_claim(&UNIT_SYSTEM, R_PB2); // BOOT1
-    }
-#else
-    #error "BAD PLATFORM!"
-#endif
+    // - this is a macro created in the Makefile, registering all enabled units
+    UNITS_REGISTER_CMD;

+    rv = plat_init_resources2();
    assert_param(rv == 0);
 }

@ -254,13 +49,12 @@ void plat_init_resources(void)
 */
 void plat_usb_reconnect(void)
 {
-    // TODO add better reset methods available on different chips
+    if (gActiveComport != COMPORT_USB) return;

+    // TODO add other reset methods available on different chips (e.g. externam FET)
    USBD_LL_Reset(&hUsbDeviceFS);

-#if defined(GEX_PLAT_F103_BLUEPILL)
-    // F103 doesn't have pull-up control
-#else
+#if PLAT_USB_PU_CTL
    HAL_PCD_DevDisconnect(&hpcd_USB_FS);
    osDelay(100);
    HAL_PCD_DevConnect(&hpcd_USB_FS);
--- a/platform/platform.h
+++ b/platform/platform.h
@ -17,8 +17,15 @@

 // FreeRTOS includes
 #include <cmsis_os.h>
+// platform-independent GEX config
+#include "plat_config.h"
 // platform-specific stuff (includes stm32 driver headers)
 #include "plat_compat.h"
+
+#define PLAT_AHB_HZ (PLAT_AHB_MHZ*1000000)
+#define PLAT_APB1_HZ (PLAT_APB1_MHZ*1000000)
+#define PLAT_APB2_HZ (PLAT_APB2_MHZ*1000000)
+
 // assert_param, trap...
 #include "stm32_assert.h"
 // inIRQ etc
@ -34,7 +41,6 @@
 // GEX version string
 #include "version.h"

-
 // ---

 /**
--- a/platform/timebase.c
+++ b/platform/timebase.c
@ -7,8 +7,6 @@

 // ---------------------------- HAL TIMEBASE -----------------------------

-#define TIMEBASE_TIMER TIM17
-
 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
 {
    // EDIT - used 17 instead because 14 was needed for fcap
@ -102,21 +100,36 @@ uint64_t PTIM_GetMicrotime(void)
    return (uint64_t) uwMillis * 1000 + uwMicros;
 }

+
 /** microsecond delay */
-void PTIM_MicroDelay(uint16_t usec)
+void PTIM_MicroDelayAligned(uint32_t usec, register const uint32_t start)
 {
    assert_param(usec < 1000);

-    const uint16_t start = (uint16_t) TIMEBASE_TIMER->CNT;
-    const uint16_t remain = (uint16_t) (999 - start);
+    register const uint32_t remain = (1000 - start);

    if (remain > usec) {
        // timer still has enough space going forward to pass the required wait time
-        for (; TIMEBASE_TIMER->CNT < start + usec;);
+        register const uint32_t end = start + usec;
+        while (TIMEBASE_TIMER->CNT < end) {
+            __NOP();
+            __NOP();
+            __NOP();
+        }
+        return;
    }
    else {
        // timer is too close to the end
        usec -= remain;
-        for (; TIMEBASE_TIMER->CNT >= start || TIMEBASE_TIMER->CNT < usec;);
+        while (1) {
+            register const uint32_t t = TIMEBASE_TIMER->CNT;
+            if (t < start && t >= usec) return;
+        }
    }
 }
+
+/** microsecond delay */
+void PTIM_MicroDelay(const uint32_t usec)
+{
+    PTIM_MicroDelayAligned(usec, TIMEBASE_TIMER->CNT);
+}
--- a/platform/timebase.h
+++ b/platform/timebase.h
@ -8,11 +8,13 @@
 // and interrupts.
 //

-#ifndef GEX_F072_TIMEBASE_H
-#define GEX_F072_TIMEBASE_H
+#ifndef GEX_CORE_TIMEBASE_H
+#define GEX_CORE_TIMEBASE_H

 #include "platform.h"

+#define TIMEBASE_TIMER TIM17
+
 /**
 * Precision timer: get microtime as uint64_t
 * This timestamp should be monotonously increasing with a precision of ±0.5µs
@ -36,6 +38,24 @@ static inline uint32_t PTIM_GetTime(void)
 *
 * @param usec - max 998
 */
-void PTIM_MicroDelay(uint16_t usec);
+void PTIM_MicroDelay(uint32_t usec);
+
+/**
+ * Microsecond busy delay with alignment (reduced length jitter but possible up to 1 us delay)
+ *
+ * @param usec
+ */
+void PTIM_MicroDelayAligned(uint32_t usec, uint32_t start);
+
+/**
+ * Wait until the next micro timer tick
+ */
+static inline uint32_t PTIM_MicroDelayAlign(void)
+{
+    const uint32_t c = TIMEBASE_TIMER->CNT;
+    uint32_t res;
+    while ((res = TIMEBASE_TIMER->CNT) == c);
+    return res;
+}

-#endif //GEX_F072_TIMEBASE_H
+#endif //GEX_CORE_TIMEBASE_H
--- a/platform/watchdog.h
+++ b/platform/watchdog.h
@ -2,8 +2,8 @@
 // Created by MightyPork on 2018/02/27.
 //

-#ifndef GEX_F072_WATCHDOG_H
-#define GEX_F072_WATCHDOG_H
+#ifndef GEX_CORE_WATCHDOG_H
+#define GEX_CORE_WATCHDOG_H

 /**
 * Initialize the application watchdog
@ -29,4 +29,4 @@ void wd_resume(void);
 */
 void wd_restart(void);

-#endif //GEX_F072_WATCHDOG_H
+#endif //GEX_CORE_WATCHDOG_H
--- a/tasks/task_main.c
+++ b/tasks/task_main.c
@ -12,6 +12,7 @@
 #include "usb_device.h"
 #include "usbd_msc.h"
 #include "task_main.h"
+#include "comm/interfaces.h"

 /* TaskUsbEvent function */
 void TaskMain(void const * argument)
@ -25,14 +26,16 @@ void TaskMain(void const * argument)

    Indicator_Effect(STATUS_WELCOME);

-    uint32_t startTime = xTaskGetTickCount();
+    const uint32_t bootTime = HAL_GetTick();
+    uint32_t startTime = bootTime;
    uint32_t cnt = 1;
+    bool waiting_for_usb = true;
    while(1) {
        uint32_t msg;
        xTaskNotifyWait(0, UINT32_MAX, &msg, 100); // time out if nothing happened

        // periodic updates to the VFS driver
-        uint32_t now = xTaskGetTickCount();
+        uint32_t now = HAL_GetTick();
        uint32_t elapsed = now - startTime;
        if (elapsed >= 100) {
            // interval 100ms or more - slow periodic
@ -48,6 +51,9 @@ void TaskMain(void const * argument)
            Indicator_Heartbeat();

            wd_restart();
+
+            // If USB has no signal, set up alternate communication interface
+            com_switch_transfer_if_needed();
        }

        // if no message and it just timed out, go wait some more...
@ -61,6 +67,7 @@ void TaskMain(void const * argument)
            continue;
        }

+        if (gActiveComport == COMPORT_USB) {
            // Endpoint 0 - control messages for the different classes
            if (msg & USBEVT_FLAG_EP0_RX_RDY) {
                USBD_CDC_EP0_RxReady(&hUsbDeviceFS);
@ -85,11 +92,14 @@ void TaskMain(void const * argument)
 //          if (msg & (USBEVT_FLAG_EPx_IN(CDC_IN_EP))) {
 //              USBD_CDC_DataIn(&hUsbDeviceFS, CDC_IN_EP);
 //          }
+
            if (msg & (USBEVT_FLAG_EPx_IN(CDC_CMD_EP))) {
                USBD_CDC_DataIn(&hUsbDeviceFS, CDC_CMD_EP);
            }
+
            if (msg & (USBEVT_FLAG_EPx_OUT(CDC_OUT_EP))) {
                USBD_CDC_DataOut(&hUsbDeviceFS, CDC_OUT_EP);
            }
        }
+    }
 }
--- a/tasks/task_msg.h
+++ b/tasks/task_msg.h
@ -5,8 +5,8 @@
 // and TinyFrame message handling
 //

-#ifndef GEX_F072_TASK_MSG_H
-#define GEX_F072_TASK_MSG_H
+#ifndef GEX_CORE_TASK_MSG_H
+#define GEX_CORE_TASK_MSG_H

 #include "platform.h"
 #include "sched_queue.h"
@ -39,4 +39,4 @@ void rxQuePostMsg(uint8_t *buf, uint32_t len);
 extern volatile uint32_t msgQueHighWaterMark;
 #endif

-#endif //GEX_F072_TASK_MSG_H
+#endif //GEX_CORE_TASK_MSG_H
--- a/template/nrf_pins.h.txt
+++ b/template/nrf_pins.h.txt
@ -0,0 +1,41 @@
+//
+// Definition of nRF24L01+ pin mappings for the platform
+// This file may be omitted if SUPPORT_NRF is not set in plat_compat.h
+// See rsc_enum.h for the R_ resource constants
+//
+
+#ifndef GEX_NRF_PINS_H
+#define GEX_NRF_PINS_H
+
+#include "platform.h"
+#include "rsc_enum.h"
+
+#define NRF_SPI            SPI2
+#define NRF_R_SPI          R_SPI2
+
+#define NRF_IRQ_Pin        LL_GPIO_PIN_15
+#define NRF_IRQ_GPIO_Port  GPIOC
+#define NRF_R_IRQ          R_PC15
+#define NRF_EXTI_LINENUM   15
+#define NRF_SYSCFG_EXTI_PORT LL_SYSCFG_EXTI_PORTC
+
+#define NRF_NSS_Pin        LL_GPIO_PIN_13
+#define NRF_NSS_GPIO_Port  GPIOC
+#define NRF_R_NSS          R_PC13
+
+#define NRF_CE_Pin         LL_GPIO_PIN_14
+#define NRF_CE_GPIO_Port   GPIOC
+#define NRF_R_CE           R_PC14
+
+#define NRF_RST_Pin        LL_GPIO_PIN_12
+#define NRF_RST_GPIO_Port  GPIOC
+#define NRF_R_RST          R_PC12
+
+#define NRF_R_SCK          R_PB13
+#define NRF_SCK_AF         LL_GPIO_AF_0
+#define NRF_R_MISO         R_PC2
+#define NRF_MISO_AF        LL_GPIO_AF_1
+#define NRF_R_MOSI         R_PC3
+#define NRF_MOSI_AF        LL_GPIO_AF_1
+
+#endif //GEX_NRF_PINS_H
--- a/template/old/FreeRTOSConfig.plat.txt
+++ b/template/old/FreeRTOSConfig.plat.txt
@ -0,0 +1,28 @@
+#if defined(GEX_PLAT_F103_BLUEPILL) || defined(GEX_PLAT_F303_DISCOVERY) \
+    || defined(GEX_PLAT_F407_DISCOVERY)
+    // This is for F103+
+
+    /* The lowest interrupt priority that can be used in a call to a "set priority"
+    function. */
+    #define configLIBRARY_LOWEST_INTERRUPT_PRIORITY   15
+
+    #define configPRIO_BITS         4
+
+    /* The highest interrupt priority that can be used by any interrupt service
+    routine that makes calls to interrupt safe FreeRTOS API functions.  DO NOT CALL
+    INTERRUPT SAFE FREERTOS API FUNCTIONS FROM ANY INTERRUPT THAT HAS A HIGHER
+    PRIORITY THAN THIS! (higher priorities are lower numeric values. */
+    #define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 5
+
+    #define configUSE_PORT_OPTIMISED_TASK_SELECTION 1
+#elif defined(STM32F072xB)
+    // This is for F072
+    #define configLIBRARY_LOWEST_INTERRUPT_PRIORITY   3
+    #define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 1
+
+    #define configPRIO_BITS         2
+
+    #define configUSE_PORT_OPTIMISED_TASK_SELECTION 0
+#else
+    #error "BAD PLATFORM!!"
+#endif
--- a/template/old/debug_uart.h.txt
+++ b/template/old/debug_uart.h.txt
@ -0,0 +1,41 @@
+
+#define DEBUG_USART_BAUD 115200
+
+#if GEX_PLAT_F072
+
+    #define DEBUG_USART USART1
+    #define DEBUG_USART_RSC R_USART1
+    #define DEBUG_USART_PORT 'A'
+    #define DEBUG_USART_PIN  9
+    #define DEBUG_USART_AF  1
+    #define DEBUG_USART_PCLK PLAT_APB1_HZ
+
+#elif GEX_PLAT_F103
+
+    #define DEBUG_USART USART2
+    #define DEBUG_USART_RSC R_USART2
+    #define DEBUG_USART_PORT 'A'
+    #define DEBUG_USART_PIN  2
+    #define DEBUG_USART_PCLK PLAT_APB1_HZ
+
+#elif GEX_PLAT_F303
+
+    #define DEBUG_USART USART3
+    #define DEBUG_USART_RSC R_USART3
+    #define DEBUG_USART_PORT 'D'
+    #define DEBUG_USART_PIN  8
+    #define DEBUG_USART_AF  7
+    #define DEBUG_USART_PCLK PLAT_APB1_HZ
+
+#elif GEX_PLAT_F407
+
+    #define DEBUG_USART USART2
+    #define DEBUG_USART_RSC R_USART2
+    #define DEBUG_USART_PORT 'A'
+    #define DEBUG_USART_PIN  2
+    #define DEBUG_USART_AF  7
+    #define DEBUG_USART_PCLK PLAT_APB1_HZ
+
+#else
+    #error "BAD PLATFORM!"
+#endif
--- a/template/old/plat_compat.h.txt
+++ b/template/old/plat_compat.h.txt
@ -5,72 +5,6 @@
 #ifndef GEX_PLAT_COMPAT_H
 #define GEX_PLAT_COMPAT_H

-#define VFS_DRIVE_NAME "GEX"
-
-// -------- Priorities -------------
-#define TSK_MAIN_PRIO osPriorityNormal
-#define TSK_JOBS_PRIO osPriorityHigh
-#define TSK_TIMERS_PRIO 4 // this must be in the 0-7 range
-
-// -------- Static buffers ---------
-// USB / VFS task stack size
-#if DISABLE_MSC
- #define TSK_STACK_MAIN      100 // without MSC the stack usage is significantly lower
-#else
- #define TSK_STACK_MAIN      160
-#endif
-
-// 180 is normally enough if not doing extensive debug logging
-#define TSK_STACK_MSG       260 // TF message handler task stack size (all unit commands run on this thread)
-#define TSK_STACK_IDLE    64 //configMINIMAL_STACK_SIZE
-#define TSK_STACK_TIMERS  64 //configTIMER_TASK_STACK_DEPTH
-
-#define PLAT_HEAP_SIZE 4096
-
-
-
-#define BULK_READ_BUF_LEN 256   // Buffer for TF bulk reads
-#define UNIT_TMP_LEN      512   // Buffer for internal unit operations
-
-#define FLASH_SAVE_BUF_LEN  128 // Malloc'd buffer for saving to flash
-
-#define MSG_QUE_SLOT_SIZE 64 // FIXME this should be possible to lower, but there's some bug with bulk transfer / INI parser
-#define RX_QUE_CAPACITY    16 // TinyFrame rx queue size (64 bytes each)
-
-#define TF_MAX_PAYLOAD_RX 512 // TF max Rx payload
-#define TF_SENDBUF_LEN     64 // TF transmit buffer (can be less than a full frame)
-
-#define TF_MAX_ID_LST   4 // Frame ID listener count
-#define TF_MAX_TYPE_LST 6 // Frame Type listener count
-#define TF_MAX_GEN_LST  1 // Generic listener count
-
-#define USBD_MAX_STR_DESC_SIZ   64 // Descriptor conversion buffer (used for converting ASCII to UTF-16, must be 2x the size of the longest descriptor)
-#define MSC_MEDIA_PACKET       512 // Mass storage sector size (packet)
-
-#define INI_KEY_MAX    20 // Ini parser key buffer
-#define INI_VALUE_MAX  30 // Ini parser value buffer
-
-// -------- Stack buffers ----------
-#define DBG_BUF_LEN      100 // Size of the snprintf buffer for debug messages
-#define ERR_MSG_STR_LEN  64 // Error message buffer size
-#define IWBUFFER_LEN     80 // Ini writer buffer for sprintf
-
-// -------- Timeouts ------------
-#define TF_PARSER_TIMEOUT_TICKS 300 // Timeout for receiving & parsing a frame
-#define BULK_LST_TIMEOUT_MS     500 // timeout for the bulk transaction to expire
-#define MSG_QUE_POST_TIMEOUT    100 // Time to post to the messages / jobs queue
-
-// -------- Platform specific includes and defines ---------
-
-/// Feature flags:
-// PLAT_FLASHBANKS - has the Banks field on the Flash config struct
-// PLAT_NO_FLOATING_INPUTS - can't have digital inputs with no pull resistor
-// PLAT_USB_PHYCLOCK - requires special config of phy clock for USB
-// PLAT_USB_OTGFS - uses the USB OTG IP, needs different config code
-// PLAT_LOCK_BTN - use a lock button instead of a lock jumper (push to toggle)
-// PLAT_LOCK_1CLOSED - lock jumper is active (closed / button pressed) in logical 1
-// PLAT_NO_AFNUM - legacy platform without numbered AF alternatives
-
 #if defined(GEX_PLAT_F103_BLUEPILL)

    // platform name for the version string
@ -124,10 +58,8 @@
    #define STATUS_LED_PORT 'C'
    #define STATUS_LED_PIN  13

-#elif defined(GEX_PLAT_F072_DISCOVERY)
+#elif defined(STM32F072xB)

-    // platform name for the version string
-    #define GEX_PLATFORM "STM32F072-Discovery"
    #define PLAT_AHB_MHZ 48
    #define PLAT_APB1_MHZ 48

@ -162,6 +94,10 @@
    // Number of GPIO ports A,B,C...
    #define PORTS_COUNT 6

+    #if defined(GEX_PLAT_F072_DISCOVERY)
+        // platform name for the version string
+        #define GEX_PLATFORM "STM32F072-Discovery"
+
        // Lock jumper config
        #define LOCK_JUMPER_PORT 'A'
        #define LOCK_JUMPER_PIN  0
@ -171,6 +107,41 @@
        // Status LED config
        #define STATUS_LED_PORT 'C'
        #define STATUS_LED_PIN  6 // RED LED "UP"
+    #elif defined(GEX_PLAT_F072_HUB)
+        // platform name for the version string
+        #define GEX_PLATFORM "STM32F072-HUB"
+
+        #define PLAT_FULL_XTAL 1
+
+        // Lock jumper config
+        #define LOCK_JUMPER_PORT 'D'
+        #define LOCK_JUMPER_PIN  2
+        #define PLAT_LOCK_BTN 1 // toggle button instead of a jumper
+        #define PLAT_LOCK_1CLOSED 0 // toggle button active in log. 1
+
+        // Status LED config
+        #define STATUS_LED_PORT 'A'
+        #define STATUS_LED_PIN  15 // RED LED "UP"
+    #elif defined(GEX_PLAT_F072_ZERO)
+        // platform name for the version string
+        #define GEX_PLATFORM "STM32F072-ZERO"
+
+        #define PLAT_FULL_XTAL 1
+
+        // Lock jumper config
+        #define LOCK_JUMPER_PORT 'D'
+        #define LOCK_JUMPER_PIN  2
+        #define PLAT_LOCK_BTN 1 // toggle button instead of a jumper
+        #define PLAT_LOCK_1CLOSED 1 // toggle button active in log. 1
+
+        // Status LED config
+        #define STATUS_LED_PORT 'A'
+        #define STATUS_LED_PIN  15 // RED LED "UP"
+
+        #define SUPPORT_NRF 1
+    #else
+        #error Bad platform
+    #endif

 #elif defined(GEX_PLAT_F303_DISCOVERY)

--- a/template/old/plat_init.c.txt
+++ b/template/old/plat_init.c.txt
@ -0,0 +1,194 @@
+
+#if defined(GEX_PLAT_F103_BLUEPILL)
+    // Platform STM32F103C8T6 Bluepill ($4 board from eBay)
+
+    // Units supported by the platform (known to work correctly)
+
+    // free all present resources
+    {
+        rsc_free_range(NULL, R_ADC1, R_ADC2);
+        rsc_free_range(NULL, R_I2C1, R_I2C2);
+        rsc_free_range(NULL, R_SPI1, R_SPI2);
+        rsc_free_range(NULL, R_TIM1, R_TIM4);
+        rsc_free_range(NULL, R_USART1, R_USART3);
+        rsc_free_range(NULL, R_PA0, R_PA15);
+        rsc_free_range(NULL, R_PB0, R_PB15);
+        rsc_free_range(NULL, R_PC13, R_PC15);
+        rsc_free_range(NULL, R_PD0, R_PD1);
+    }
+
+    // Claim resources not available due to board layout or internal usage
+    {
+        // HAL timebase
+        rv |= rsc_claim(&UNIT_SYSTEM, R_TIM1);
+        // HSE crystal
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PD0);
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PD1);
+        // SWD
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA13);
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA14);
+        // USB
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA11);
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA12);
+        // BOOT pin(s)
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PB2); // BOOT1
+    }
+#elif defined(STM32F072xB)
+    // Platform STM32F073RBT
+
+
+    // Free all present resources
+    {
+        rsc_free(NULL, R_ADC1);
+//        rsc_free(NULL, R_CAN1);
+//        rsc_free_range(NULL, R_COMP1, R_COMP2);
+        rsc_free(NULL, R_DAC1);
+//        rsc_free(NULL, R_HDMI_CEC);
+        rsc_free(NULL, R_TSC);
+        rsc_free_range(NULL, R_I2C1, R_I2C2);
+//        rsc_free_range(NULL, R_I2S1, R_I2S2);
+        rsc_free_range(NULL, R_SPI1, R_SPI2);
+        rsc_free_range(NULL, R_TIM1, R_TIM3);
+        rsc_free_range(NULL, R_TIM6, R_TIM7);
+        rsc_free_range(NULL, R_TIM14, R_TIM17);
+        rsc_free_range(NULL, R_USART1, R_USART4);
+        rsc_free_range(NULL, R_DMA1_1, R_DMA1_7);
+
+        rsc_free_range(NULL, R_PA0, R_PA15);
+        rsc_free_range(NULL, R_PB0, R_PB15);
+        rsc_free_range(NULL, R_PC0, R_PC15);
+        rsc_free(NULL, R_PD2);
+        rsc_free_range(NULL, R_PF0, R_PF1);
+    }
+
+    // Claim resources not available due to board layout or internal usage
+    {
+        // HAL timebase
+        rv |= rsc_claim(&UNIT_SYSTEM, R_TIM17);
+        // HSE crystal
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PF0);
+
+        #if PLAT_FULL_XTAL
+            rv |= rsc_claim(&UNIT_SYSTEM, R_PF1); // - not used in BYPASS mode
+        #endif
+
+        // SWD
+//        rv |= rsc_claim(&UNIT_SYSTEM, R_PA13);
+//        rv |= rsc_claim(&UNIT_SYSTEM, R_PA14);
+        // USB
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA11);
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA12);
+
+        #if defined(GEX_PLAT_F072_ZERO)
+            // unconnected pins
+            rv |= rsc_claim_range(&UNIT_PLATFORM, R_PC0, R_PC1);
+            rv |= rsc_claim_range(&UNIT_PLATFORM, R_PC4, R_PC9);
+        #endif
+    }
+#elif defined(GEX_PLAT_F303_DISCOVERY)
+    // Platform STM32F303VCT
+
+    // Additional GPIO ports
+    __HAL_RCC_GPIOF_CLK_ENABLE();
+
+    // Units supported by the platform (known to work correctly)
+    // ureg_add_type(&UNIT_XYZ);
+
+    // Free all present resources
+    {
+        rsc_free_range(NULL, R_ADC1, R_ADC4);
+//        rsc_free(NULL, R_CAN1);
+//        rsc_free_range(NULL, R_COMP1, R_COMP7);
+//        rsc_free(NULL, R_HDMI_CEC);
+        rsc_free(NULL, R_DAC1);
+        rsc_free_range(NULL, R_I2C1, R_I2C2);
+        rsc_free_range(NULL, R_I2S2, R_I2S3);
+//        rsc_free_range(NULL, R_OPAMP1, R_OPAMP4);
+        rsc_free_range(NULL, R_SPI1, R_SPI3);
+        rsc_free_range(NULL, R_TIM1, R_TIM4);
+        rsc_free_range(NULL, R_TIM6, R_TIM8);
+        rsc_free_range(NULL, R_TIM15, R_TIM17);
+        rsc_free(NULL, R_TSC);
+        rsc_free_range(NULL, R_USART1, R_USART5);
+
+        rsc_free_range(NULL, R_PA0, R_PA15);
+        rsc_free_range(NULL, R_PB0, R_PB15);
+        rsc_free_range(NULL, R_PC0, R_PC15);
+        rsc_free_range(NULL, R_PD0, R_PD15);
+        rsc_free_range(NULL, R_PE0, R_PE15);
+
+        rsc_free_range(NULL, R_PF0, R_PF2);
+        rsc_free(NULL, R_PF4);
+        rsc_free_range(NULL, R_PF9, R_PF10);
+    }
+
+    // Claim resources not available due to board layout or internal usage
+    {
+        // HAL timebase
+        rv |= rsc_claim(&UNIT_SYSTEM, R_TIM1);
+        // HSE crystal
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PF0);
+        //rv |= rsc_claim(&UNIT_SYSTEM, R_PF1); // - not used in BYPASS mode
+        // SWD
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA13);
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA14);
+        // USB
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA11);
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA12);
+        // BOOT pin(s)
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PB2); // BOOT1
+    }
+#elif defined(GEX_PLAT_F407_DISCOVERY)
+    // Platform STM32F407VGT
+
+    // Additional GPIO ports
+    __HAL_RCC_GPIOF_CLK_ENABLE();
+
+    // Units supported by the platform (known to work correctly)
+    // ureg_add_type(&UNIT_XYZ);
+
+    // Free all present resources
+    {
+        rsc_free_range(NULL, R_ADC1, R_ADC3);
+//        rsc_free_range(NULL, R_CAN1, R_CAN2);
+//        rsc_free_range(NULL, R_COMP1, R_COMP7);
+        rsc_free(NULL, R_DAC1);
+//        rsc_free(NULL, R_DCMI);
+//        rsc_free(NULL, R_ETH);
+//        rsc_free(NULL, R_FSMC);
+        rsc_free_range(NULL, R_I2C1, R_I2C3);
+        rsc_free_range(NULL, R_I2S2, R_I2S3);
+//        rsc_free(NULL, R_SDIO);
+        rsc_free_range(NULL, R_SPI1, R_SPI3);
+        rsc_free_range(NULL, R_TIM1, R_TIM14);
+        rsc_free_range(NULL, R_USART1, R_USART3);
+        rsc_free(NULL, R_USART6);
+
+        rsc_free_range(NULL, R_PA0, R_PA15);
+        rsc_free_range(NULL, R_PB0, R_PB15);
+        rsc_free_range(NULL, R_PC0, R_PC15);
+        rsc_free_range(NULL, R_PD0, R_PD15);
+        rsc_free_range(NULL, R_PE0, R_PE15);
+        // also has 2 PH pins
+
+        // F407 appears to have fewer GPIOs than F303?
+    }
+
+    // Claim resources not available due to board layout or internal usage
+    {
+        // HAL timebase
+        rv |= rsc_claim(&UNIT_SYSTEM, R_TIM1);
+        // HSE crystal
+        // H0 and H1
+        // SWD
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA13);
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA14);
+        // USB
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA11);
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PA12);
+        // BOOT pin(s)
+        rv |= rsc_claim(&UNIT_SYSTEM, R_PB2); // BOOT1
+    }
+#else
+    #error "BAD PLATFORM!"
+#endif
--- a/template/plat_compat.h.txt
+++ b/template/plat_compat.h.txt
@ -0,0 +1,46 @@
+#ifndef GEX_PLAT_COMPAT_H
+#define GEX_PLAT_COMPAT_H
+
+// string identifying the GEX board
+#define GEX_PLATFORM "Discovery-XYZ"
+#define GEX_PLAT_XYZ 1 // only with the MCU name
+
+// GEX_PLAT_XYZ_BOARD is defined in build.mk to identify particular board layout
+
+#define PLAT_AHB_MHZ  72
+#define PLAT_APB1_MHZ 36
+
+#include ... // all useful from the peripheral library (HAL / LL)
+
+// in bytes
+#define FLASH_SIZE (128*1024)
+// in bytes
+#define SETTINGS_BLOCK_SIZE (2*1024)
+// address where the settings block starts
+#define SETTINGS_FLASH_ADDR (0x08000000 + FLASH_SIZE - SETTINGS_BLOCK_SIZE)
+
+#define PORTS_COUNT       5   // number of available GPIO ports A,B,C,D,E,F...
+#define LOCK_JUMPER_PORT 'A'
+#define LOCK_JUMPER_PIN   2
+
+#define STATUS_LED_PORT 'A'
+#define STATUS_LED_PIN  15
+
+// Feature flags:
+#define PLAT_FLASHBANKS   0        // has the Banks field on the Flash config struct
+#define PLAT_NO_FLOATING_INPUTS 0  // can't have digital inputs with no pull resistor
+#define PLAT_USB_PHYCLOCK 0        // requires special config of phy clock for USB
+#define PLAT_USB_OTGFS    0        // uses the USB OTG IP, needs different config code
+#define PLAT_LOCK_BTN     1        // use a lock button instead of a lock jumper (push to toggle)
+#define PLAT_LOCK_1CLOSED 1        // lock jumper is active (closed / button pressed) in logical 1
+#define PLAT_NO_AFNUM     0        // legacy platform without numbered AF alternatives
+#define PLAT_FULL_XTAL    1        // use two-wire xtal attachment
+#define PLAT_USB_PU_CTL   1        // platform has USB pullup control
+
+// FreeRTOS config
+#define PLAT_FREERTOS_LOWEST_INTERRUPT_PRIORITY          3
+#define PLAT_FREERTOS_MAX_SYSCALL_INTERRUPT_PRIORITY     1
+#define PLAT_FREERTOS_PRIO_BITS                          2
+#define PLAT_FREERTOS_USE_PORT_OPTIMISED_TASK_SELECTION  0
+
+#endif //GEX_PLAT_COMPAT_H
--- a/template/template_unit.zip
+++ b/template/template_unit.zip
--- a/units/1wire/_ow_api.c
+++ b/units/1wire/_ow_api.c
@ -1,129 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_1wire.h"
-
-// 1WIRE master
-#define OW_INTERNAL
-#include "_ow_internal.h"
-#include "_ow_commands.h"
-#include "_ow_low_level.h"
-
-/* Check presence of any devices on the bus */
-error_t UU_1WIRE_CheckPresence(Unit *unit, bool *presence)
-{
-    CHECK_TYPE(unit, &UNIT_1WIRE);
-    // reset
-    *presence = ow_reset(unit);
-    return E_SUCCESS;
-}
-
-/* Read address of a lone device on the bus */
-error_t UU_1WIRE_ReadAddress(Unit *unit, uint64_t *address)
-{
-    CHECK_TYPE(unit, &UNIT_1WIRE);
-    *address = 0;
-    if (!ow_reset(unit)) return E_HW_TIMEOUT;
-
-    // command
-    ow_write_u8(unit, OW_ROM_READ);
-
-    // read the ROM code
-    *address = ow_read_u64(unit);
-
-    const uint8_t *addr_as_bytes = (void*)address;
-    if (0 != ow_checksum(addr_as_bytes, 8)) {
-        *address = 0;
-        return E_CHECKSUM_MISMATCH; // checksum mismatch
-    }
-    return E_SUCCESS;
-}
-
-/* Write bytes to a device */
-error_t UU_1WIRE_Write(Unit *unit, uint64_t address, const uint8_t *buff, uint32_t len)
-{
-    CHECK_TYPE(unit, &UNIT_1WIRE);
-    if (!ow_reset(unit)) return E_HW_TIMEOUT;
-
-    // MATCH_ROM+addr, or SKIP_ROM
-    if (address != 0) {
-        ow_write_u8(unit, OW_ROM_MATCH);
-        ow_write_u64(unit, address);
-    } else {
-        ow_write_u8(unit, OW_ROM_SKIP);
-    }
-
-    // write the payload;
-    for (uint32_t i = 0; i < len; i++) {
-        ow_write_u8(unit, *buff++);
-    }
-    return E_SUCCESS;
-}
-
-/* Write a request to a device and read a response */
-error_t UU_1WIRE_Read(Unit *unit, uint64_t address,
-                      const uint8_t *request_buff, uint32_t request_len,
-                      uint8_t *response_buff, uint32_t response_len, bool check_crc)
-{
-    CHECK_TYPE(unit, &UNIT_1WIRE);
-    if (!ow_reset(unit)) return E_HW_TIMEOUT;
-
-    uint8_t *rb = response_buff;
-
-    // MATCH_ROM+addr, or SKIP_ROM
-    if (address != 0) {
-        ow_write_u8(unit, OW_ROM_MATCH);
-        ow_write_u64(unit, address);
-    } else {
-        ow_write_u8(unit, OW_ROM_SKIP);
-    }
-
-    // write the payload;
-    for (uint32_t i = 0; i < request_len; i++) {
-        ow_write_u8(unit, *request_buff++);
-    }
-
-    // read the requested number of bytes
-    for (uint32_t i = 0; i < response_len; i++) {
-        *rb++ = ow_read_u8(unit);
-    }
-
-    if (check_crc) {
-        if (0 != ow_checksum(response_buff, response_len)) {
-            return E_CHECKSUM_MISMATCH;
-        }
-    }
-    return E_SUCCESS;
-}
-
-/* Perform the search algorithm (start or continue) */
-error_t UU_1WIRE_Search(Unit *unit, bool with_alarm, bool restart,
-                        uint64_t *buffer, uint32_t capacity, uint32_t *real_count,
-                        bool *have_more)
-{
-    CHECK_TYPE(unit, &UNIT_1WIRE);
-    struct priv *priv = unit->data;
-
-    if (restart) {
-        uint8_t search_cmd = (uint8_t) (with_alarm ? OW_ROM_ALM_SEARCH : OW_ROM_SEARCH);
-        ow_search_init(unit, search_cmd, true);
-    }
-
-    *real_count = ow_search_run(unit, (ow_romcode_t *) buffer, capacity);
-
-    // resolve the code
-    switch (priv->searchState.status) {
-        case OW_SEARCH_MORE:
-            *have_more = priv->searchState.status == OW_SEARCH_MORE;
-
-        case OW_SEARCH_DONE:
-            return E_SUCCESS;
-
-        case OW_SEARCH_FAILED:
-            return priv->searchState.error;
-    }
-
-    return E_INTERNAL_ERROR;
-}
--- a/units/1wire/_ow_commands.h
+++ b/units/1wire/_ow_commands.h
@ -1,18 +0,0 @@
-//
-// Created by MightyPork on 2018/01/29.
-//
-
-#ifndef GEX_F072_OW_COMMANDS_H
-#define GEX_F072_OW_COMMANDS_H
-
-#ifndef OW_INTERNAL
-#error bad include!
-#endif
-
-#define OW_ROM_SEARCH     0xF0
-#define OW_ROM_READ       0x33
-#define OW_ROM_MATCH      0x55
-#define OW_ROM_SKIP       0xCC
-#define OW_ROM_ALM_SEARCH 0xEC
-
-#endif //GEX_F072_OW_COMMANDS_H
--- a/units/1wire/_ow_init.c
+++ b/units/1wire/_ow_init.c
@ -1,59 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-
-#define OW_INTERNAL
-#include "_ow_internal.h"
-
-/** Allocate data structure and set defaults */
-error_t OW_preInit(Unit *unit)
-{
-    struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
-    if (priv == NULL) return E_OUT_OF_MEM;
-
-    // some defaults
-    priv->pin_number = 0;
-    priv->port_name = 'A';
-    priv->parasitic = false;
-
-    return E_SUCCESS;
-}
-
-/** Finalize unit set-up */
-error_t OW_init(Unit *unit)
-{
-    bool suc = true;
-    struct priv *priv = unit->data;
-
-    // --- Parse config ---
-    priv->ll_pin = hw_pin2ll(priv->pin_number, &suc);
-    priv->port = hw_port2periph(priv->port_name, &suc);
-    Resource rsc = rsc_portpin2rsc(priv->port_name, priv->pin_number, &suc);
-    if (!suc) return E_BAD_CONFIG;
-
-    // --- Claim resources ---
-    TRY(rsc_claim(unit, rsc));
-
-    // --- Init hardware ---
-    LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_OUTPUT);
-    LL_GPIO_SetPinOutputType(priv->port, priv->ll_pin, LL_GPIO_OUTPUT_PUSHPULL);
-    LL_GPIO_SetPinSpeed(priv->port, priv->ll_pin, LL_GPIO_SPEED_FREQ_HIGH);
-    LL_GPIO_SetPinPull(priv->port, priv->ll_pin, LL_GPIO_PULL_UP); // pull-up for OD state
-
-    return E_SUCCESS;
-}
-
-/** Tear down the unit */
-void OW_deInit(Unit *unit)
-{
-    struct priv *priv = unit->data;
-
-    // Release all resources
-    rsc_teardown(unit);
-
-    // Free memory
-    free_ck(unit->data);
-}
--- a/units/1wire/_ow_internal.h
+++ b/units/1wire/_ow_internal.h
@ -1,60 +0,0 @@
-//
-// Created by MightyPork on 2018/01/29.
-//
-
-#ifndef GEX_F072_OW_INTERNAL_H
-#define GEX_F072_OW_INTERNAL_H
-
-#ifndef OW_INTERNAL
-#error bad include!
-#endif
-
-#include "_ow_search.h"
-
-/** Private data structure */
-struct priv {
-    char port_name;
-    uint8_t pin_number;
-    bool parasitic;
-
-    GPIO_TypeDef *port;
-    uint32_t ll_pin;
-
-    TimerHandle_t busyWaitTimer; // timer used to wait for ds1820 measurement completion
-    bool busy; // flag used when the timer is running
-    uint32_t busyStart;
-    TF_ID busyRequestId;
-    struct ow_search_state searchState;
-};
-
-/** Load from a binary buffer stored in Flash */
-void OW_loadBinary(Unit *unit, PayloadParser *pp);
-
-/** Write to a binary buffer for storing in Flash */
-void OW_writeBinary(Unit *unit, PayloadBuilder *pb);
-
-// ------------------------------------------------------------------------
-
-/** Parse a key-value pair from the INI file */
-error_t OW_loadIni(Unit *unit, const char *key, const char *value);
-
-/** Generate INI file section for the unit */
-void OW_writeIni(Unit *unit, IniWriter *iw);
-
-// ------------------------------------------------------------------------
-
-/** Allocate data structure and set defaults */
-error_t OW_preInit(Unit *unit);
-
-/** Finalize unit set-up */
-error_t OW_init(Unit *unit);
-
-/** Tear down the unit */
-void OW_deInit(Unit *unit);
-
-/** Callback for the FreeRTOS timer used to wait for device ready */
-void OW_TimerCb(TimerHandle_t xTimer);
-
-// ------------------------------------------------------------------------
-
-#endif //GEX_F072_OW_INTERNAL_H
--- a/units/1wire/_ow_low_level.c
+++ b/units/1wire/_ow_low_level.c
@ -1,223 +0,0 @@
-//
-// Created by MightyPork on 2018/01/29.
-//
-// 1-Wire unit low level functions
-//
-
-#include "platform.h"
-
-#define OW_INTERNAL
-#include "_ow_internal.h"
-#include "_ow_low_level.h"
-
-static inline uint8_t crc8_bits(uint8_t data)
-{
-    uint8_t crc = 0;
-    if(data & 1)     crc ^= 0x5e;
-    if(data & 2)     crc ^= 0xbc;
-    if(data & 4)     crc ^= 0x61;
-    if(data & 8)     crc ^= 0xc2;
-    if(data & 0x10)  crc ^= 0x9d;
-    if(data & 0x20)  crc ^= 0x23;
-    if(data & 0x40)  crc ^= 0x46;
-    if(data & 0x80)  crc ^= 0x8c;
-    return crc;
-}
-
-static uint8_t crc8_add(uint8_t cksum, uint8_t byte)
-{
-    return crc8_bits(byte ^ cksum);
-}
-
-uint8_t ow_checksum(const uint8_t *buff, uint32_t len)
-{
-    uint8_t cksum = 0;
-    for(uint32_t i = 0; i < len; i++) {
-        cksum = crc8_add(cksum, buff[i]);
-    }
-    return cksum;
-}
-
-// ----------------------------------------------
-
-static inline void ow_pull_high(Unit *unit)
-{
-    struct priv *priv = unit->data;
-    LL_GPIO_SetOutputPin(priv->port, priv->ll_pin);
-    LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_OUTPUT);
-}
-
-static inline void ow_pull_low(Unit *unit)
-{
-    struct priv *priv = unit->data;
-    LL_GPIO_ResetOutputPin(priv->port, priv->ll_pin);
-    LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_OUTPUT);
-}
-
-static inline void ow_release_line(Unit *unit)
-{
-    struct priv *priv = unit->data;
-    LL_GPIO_SetPinMode(priv->port, priv->ll_pin, LL_GPIO_MODE_INPUT);
-}
-
-static inline bool ow_sample_line(Unit *unit)
-{
-    struct priv *priv = unit->data;
-    return (bool) LL_GPIO_IsInputPinSet(priv->port, priv->ll_pin);
-}
-
-/**
- * Reset the 1-wire bus
- */
-bool ow_reset(Unit *unit)
-{
-    ow_pull_low(unit);
-    PTIM_MicroDelay(500);
-
-    bool presence;
-    vPortEnterCritical();
-    {
-        // Strong pull-up (for parasitive power)
-        ow_pull_high(unit);
-        PTIM_MicroDelay(2);
-
-        // switch to open-drain
-        ow_release_line(unit);
-        PTIM_MicroDelay(118);
-
-        presence = !ow_sample_line(unit);
-    }
-    vPortExitCritical();
-
-    PTIM_MicroDelay(130);
-    return presence;
-}
-
-/**
- * Write a bit to the 1-wire bus
- */
-void ow_write_bit(Unit *unit, bool bit)
-{
-    vPortEnterCritical();
-    {
-        // start mark
-        ow_pull_low(unit);
-        PTIM_MicroDelay(2);
-
-        if (bit) ow_pull_high(unit);
-        PTIM_MicroDelay(70);
-
-        // Strong pull-up (for parasitive power)
-        ow_pull_high(unit);
-    }
-    vPortExitCritical();
-
-    PTIM_MicroDelay(2);
-}
-
-/**
- * Read a bit from the 1-wire bus
- */
-bool ow_read_bit(Unit *unit)
-{
-    bool bit;
-
-    vPortEnterCritical();
-    {
-        // start mark
-        ow_pull_low(unit);
-        PTIM_MicroDelay(2);
-
-        ow_release_line(unit);
-        PTIM_MicroDelay(20);
-
-        bit = ow_sample_line(unit);
-    }
-    vPortExitCritical();
-
-    PTIM_MicroDelay(40);
-
-    return bit;
-}
-
-/**
- * Write a byte to the 1-wire bus
- */
-void ow_write_u8(Unit *unit, uint8_t byte)
-{
-    for (int i = 0; i < 8; i++) {
-        ow_write_bit(unit, 0 != (byte & (1 << i)));
-    }
-}
-
-/**
- * Write a halfword to the 1-wire bus
- */
-void ow_write_u16(Unit *unit, uint16_t halfword)
-{
-    ow_write_u8(unit, (uint8_t) (halfword & 0xFF));
-    ow_write_u8(unit, (uint8_t) ((halfword >> 8) & 0xFF));
-}
-
-/**
- * Write a word to the 1-wire bus
- */
-void ow_write_u32(Unit *unit, uint32_t word)
-{
-    ow_write_u16(unit, (uint16_t) (word));
-    ow_write_u16(unit, (uint16_t) (word >> 16));
-}
-
-/**
- * Write a doubleword to the 1-wire bus
- */
-void ow_write_u64(Unit *unit, uint64_t dword)
-{
-    ow_write_u32(unit, (uint32_t) (dword));
-    ow_write_u32(unit, (uint32_t) (dword >> 32));
-}
-
-/**
- * Read a byte form the 1-wire bus
- */
-uint8_t ow_read_u8(Unit *unit)
-{
-    uint8_t buf = 0;
-    for (int i = 0; i < 8; i++) {
-        buf |= (1 & ow_read_bit(unit)) << i;
-    }
-    return buf;
-}
-
-/**
- * Read a halfword form the 1-wire bus
- */
-uint16_t ow_read_u16(Unit *unit)
-{
-    uint16_t acu = 0;
-    acu |= ow_read_u8(unit);
-    acu |= ow_read_u8(unit) << 8;
-    return acu;
-}
-
-/**
- * Read a word form the 1-wire bus
- */
-uint32_t ow_read_u32(Unit *unit)
-{
-    uint32_t acu = 0;
-    acu |= ow_read_u16(unit);
-    acu |= (uint32_t)ow_read_u16(unit) << 16;
-    return acu;
-}
-
-/**
- * Read a doubleword form the 1-wire bus
- */
-uint64_t ow_read_u64(Unit *unit)
-{
-    uint64_t acu = 0;
-    acu |= ow_read_u32(unit);
-    acu |= (uint64_t)ow_read_u32(unit) << 32;
-    return acu;
-}
--- a/units/1wire/_ow_low_level.h
+++ b/units/1wire/_ow_low_level.h
@ -1,84 +0,0 @@
-//
-// Created by MightyPork on 2018/02/01.
-//
-
-#ifndef GEX_F072_OW_LOW_LEVEL_H
-#define GEX_F072_OW_LOW_LEVEL_H
-
-#ifndef OW_INTERNAL
-#error bad include!
-#endif
-
-#include "platform.h"
-#include "unit_base.h"
-#include "_ow_low_level.h"
-
-/**
- * Compute a 1-wire type checksum.
- * If the buffer includes the checksum, the result should be 0.
- *
- * (this function may be used externally, or you can delete the implementation
- * from the c file if another implementation is already available)
- *
- * @param[in] buf - buffer of bytes to verify
- * @param[in] len - buffer length
- * @return checksum
- */
-uint8_t ow_checksum(const uint8_t *buf, uint32_t len);
-
-/**
- * Reset the 1-wire bus
- */
-bool ow_reset(Unit *unit);
-
-/**
- * Write a bit to the 1-wire bus
- */
-void ow_write_bit(Unit *unit, bool bit);
-
-/**
- * Read a bit from the 1-wire bus
- */
-bool ow_read_bit(Unit *unit);
-
-/**
- * Write a byte to the 1-wire bus
- */
-void ow_write_u8(Unit *unit, uint8_t byte);
-
-/**
- * Write a halfword to the 1-wire bus
- */
-void ow_write_u16(Unit *unit, uint16_t halfword);
-
-/**
- * Write a word to the 1-wire bus
- */
-void ow_write_u32(Unit *unit, uint32_t word);
-
-/**
- * Write a doubleword to the 1-wire bus
- */
-void ow_write_u64(Unit *unit, uint64_t dword);
-
-/**
- * Read a byte form the 1-wire bus
- */
-uint8_t ow_read_u8(Unit *unit);
-
-/**
- * Read a halfword form the 1-wire bus
- */
-uint16_t ow_read_u16(Unit *unit);
-
-/**
- * Read a word form the 1-wire bus
- */
-uint32_t ow_read_u32(Unit *unit);
-
-/**
- * Read a doubleword form the 1-wire bus
- */
-uint64_t ow_read_u64(Unit *unit);
-
-#endif //GEX_F072_OW_LOW_LEVEL_H
--- a/units/1wire/_ow_search.c
+++ b/units/1wire/_ow_search.c
@ -1,129 +0,0 @@
-//
-// Created by MightyPork on 2018/02/01.
-//
-
-#include "platform.h"
-#include "unit_1wire.h"
-
-#define OW_INTERNAL
-#include "_ow_search.h"
-#include "_ow_internal.h"
-#include "_ow_low_level.h"
-#include "_ow_commands.h"
-
-void ow_search_init(Unit *unit, uint8_t command, bool test_checksums)
-{
-    if (unit->driver != &UNIT_1WIRE)
-        trap("Wrong unit type - %s", unit->driver->name);
-
-    assert_param(command == OW_ROM_SEARCH || command == OW_ROM_ALM_SEARCH);
-
-    struct priv *priv = unit->data;
-    struct ow_search_state *state = &priv->searchState;
-    
-    state->prev_last_fork = 64;
-    memset(state->prev_code, 0, 8);
-    state->status = OW_SEARCH_MORE;
-    state->error = E_SUCCESS;
-    state->command = command;
-    state->first = true;
-    state->test_checksums = test_checksums;
-}
-
-uint32_t ow_search_run(Unit *unit, ow_romcode_t *codes, uint32_t capacity)
-{
-    if (unit->driver != &UNIT_1WIRE)
-        trap("Wrong unit type - %s", unit->driver->name);
-
-    assert_param(codes);
-
-    struct priv *priv = unit->data;
-    struct ow_search_state *state = &priv->searchState;
-
-    if (state->status != OW_SEARCH_MORE) return 0;
-
-    uint32_t found_devices = 0;
-
-    while (found_devices < capacity) {
-        uint8_t index = 0;
-        ow_romcode_t code = {};
-        int8_t last_fork = -1;
-
-        // Start a new transaction. Devices respond to reset
-        if (!ow_reset(unit)) {
-            state->status = OW_SEARCH_FAILED;
-            state->error = E_HW_TIMEOUT;
-            goto done;
-        }
-        // Send the search command (SEARCH_ROM, SEARCH_ALARM)
-        ow_write_u8(unit, state->command);
-
-        uint8_t *code_byte = &code[0];
-
-        bool p, n;
-        while (index != 64) {
-            // Read a bit and its complement
-            p = ow_read_bit(unit);
-            n = ow_read_bit(unit);
-
-            if (!p && !n) {
-                // A fork: there are devices on the bus with different bit value
-                // (the bus is open-drain, in both cases one device pulls it low)
-                if ((found_devices > 0 || !state->first) && index < state->prev_last_fork) {
-                    // earlier than the last fork, take the same turn as before
-                    p = ow_code_getbit(state->prev_code, index);
-                    if (!p) last_fork = index; // remember for future runs, 1 not explored yet
-                }
-                else if (index == state->prev_last_fork) {
-                    p = 1; // both forks are now exhausted
-                }
-                else { // a new fork
-                    last_fork = index;
-                }
-            }
-            else if (p && n) {
-                // No devices left connected - this doesn't normally happen
-                state->status = OW_SEARCH_FAILED;
-                state->error = E_BUS_FAULT;
-                goto done;
-            }
-
-            // All devices have a matching bit here, or it was resolved in a fork
-            if (p) *code_byte |= (1 << (index & 7));
-            ow_write_bit(unit, p);
-
-            index++;
-            if((index & 7) == 0) {
-                code_byte++;
-            }
-        }
-
-        memcpy(state->prev_code, code, 8);
-
-        if (state->test_checksums) {
-            if (0 != ow_checksum(code, 8)) {
-                state->status = OW_SEARCH_FAILED;
-                state->error = E_CHECKSUM_MISMATCH;
-                goto done;
-            }
-        }
-
-        // Record a found address
-        memcpy(codes[found_devices], code, 8);
-        found_devices++;
-
-        // Stop condition
-        if (last_fork == -1) {
-            state->status = OW_SEARCH_DONE;
-            goto done;
-        }
-
-        state->prev_last_fork = last_fork;
-    }
-
-done:
-    state->first = false;
-    return found_devices;
-}
-
-
--- a/units/1wire/_ow_search.h
+++ b/units/1wire/_ow_search.h
@ -1,83 +0,0 @@
-//
-// Created by MightyPork on 2018/02/01.
-//
-
-#ifndef GEX_F072_OW_SEARCH_H
-#define GEX_F072_OW_SEARCH_H
-
-#ifndef OW_INTERNAL
-#error bad include!
-#endif
-
-#include <stdint.h>
-#include <stdbool.h>
-#include "unit_base.h"
-
-// --------------------------------------------------------------------------------------
-
-/**
- * Data type holding a romcode
- */
-typedef uint8_t ow_romcode_t[8];
-
-/**
- * Get a single bit from a romcode
- */
-#define ow_code_getbit(code, index) (bool)((code)[(index) >> 3] & (1 << ((index) & 7)))
-
-/**
- * Convert to unsigned 64-bit integer
- * (works only on little-endian systems - eg. OK on x86/x86_64, not on PowerPC)
- */
-#define ow_romcode_to_u64(code) (*((uint64_t *) (void *)(code)))
-
-/**
- * States of the search algorithm
- */
-enum ow_search_result {
-    OW_SEARCH_DONE = 0,
-    OW_SEARCH_MORE = 1,
-    OW_SEARCH_FAILED = 2,
-};
-
-/**
- * Internal state of the search algorithm.
- * Check status to see if more remain to be read or an error occurred.
- */
-struct ow_search_state {
-    int8_t prev_last_fork;
-    ow_romcode_t prev_code;
-    uint8_t command;
-    enum ow_search_result status;
-    bool first;
-    bool test_checksums;
-    error_t error;
-};
-
-/**
- * Init the search algorithm state structure
- *
- * @param[out] state - inited struct
- * @param[in] command - command to send for requesting the search (e.g. SEARCH_ROM)
- * @param[in] test_checksums - verify checksums of all read romcodes
- */
-void ow_search_init(Unit *unit, uint8_t command, bool test_checksums);
-
-/**
- * Perform a search of the 1-wire bus, with a state struct pre-inited
- * using ow_search_init().
- *
- * Romcodes are stored in the provided array in a numerically ascending order.
- *
- * This function may be called repeatedly to retrieve more addresses than could fit
- * in the address buffer.
- *
- * @param[in,out] state - search state, used for multiple calls with limited buffer size
- * @param[out] codes - buffer for found romcodes
- * @param[in] capacity - buffer capacity
- * @return number of romcodes found. Search status is stored in `state->status`,
- *         possible error code in `status->error`
- */
-uint32_t ow_search_run(Unit *unit, ow_romcode_t *codes, uint32_t capacity);
-
-#endif //GEX_F072_OW_SEARCH_H
--- a/units/1wire/_ow_settings.c
+++ b/units/1wire/_ow_settings.c
@ -1,68 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-
-#define OW_INTERNAL
-#include "_ow_internal.h"
-
-/** Load from a binary buffer stored in Flash */
-void OW_loadBinary(Unit *unit, PayloadParser *pp)
-{
-    struct priv *priv = unit->data;
-
-    uint8_t version = pp_u8(pp);
-    (void)version;
-
-    priv->port_name = pp_char(pp);
-    priv->pin_number = pp_u8(pp);
-    priv->parasitic = pp_bool(pp);
-}
-
-/** Write to a binary buffer for storing in Flash */
-void OW_writeBinary(Unit *unit, PayloadBuilder *pb)
-{
-    struct priv *priv = unit->data;
-
-    pb_u8(pb, 0); // version
-
-    pb_char(pb, priv->port_name);
-    pb_u8(pb, priv->pin_number);
-    pb_bool(pb, priv->parasitic);
-}
-
-// ------------------------------------------------------------------------
-
-/** Parse a key-value pair from the INI file */
-error_t OW_loadIni(Unit *unit, const char *key, const char *value)
-{
-    bool suc = true;
-    struct priv *priv = unit->data;
-
-    if (streq(key, "pin")) {
-        suc = cfg_portpin_parse(value, &priv->port_name, &priv->pin_number);
-    }
-    else if (streq(key, "parasitic")) {
-        priv->parasitic = cfg_bool_parse(value, &suc);
-    }
-    else {
-        return E_BAD_KEY;
-    }
-
-    if (!suc) return E_BAD_VALUE;
-    return E_SUCCESS;
-}
-
-/** Generate INI file section for the unit */
-void OW_writeIni(Unit *unit, IniWriter *iw)
-{
-    struct priv *priv = unit->data;
-
-    iw_comment(iw, "Data pin");
-    iw_entry(iw, "pin", "%c%d", priv->port_name,  priv->pin_number);
-
-    iw_comment(iw, "Parasitic (bus-powered) mode");
-    iw_entry_s(iw, "parasitic", str_yn(priv->parasitic));
-}
--- a/units/1wire/unit_1wire.c
+++ b/units/1wire/unit_1wire.c
@ -1,248 +0,0 @@
-//
-// Created by MightyPork on 2018/01/29.
-//
-
-#include "comm/messages.h"
-#include "unit_base.h"
-#include "unit_1wire.h"
-
-// 1WIRE master
-#define OW_INTERNAL
-#include "_ow_internal.h"
-#include "_ow_low_level.h"
-
-/** Callback for sending a poll_ready success / failure report */
-static void OW_TimerRespCb(Job *job)
-{
-    Unit *unit = job->unit;
-    assert_param(unit);
-    struct priv *priv = unit->data;
-
-    bool success = (bool) job->data1;
-
-    if (success) {
-        com_respond_ok(priv->busyRequestId);
-    } else {
-        com_respond_error(priv->busyRequestId, E_HW_TIMEOUT);
-    }
-    priv->busy = false;
-}
-
-/**
- * 1-Wire timer callback, used for the 'wait_ready' function.
- *
- * - In parasitic mode, this is a simple 750ms wait, after which a SUCCESS response is sent.
- * - In 3-wire mode, the callback is fired periodically and performs a Read operation on the bus.
- *   The unit responds with 0 while the operation is ongoing. On receiving 1 a SUCCESS response is sent.
- *   The polling is abandoned after a timeout, sending a TIMEOUT response.
- *
- * @param xTimer
- */
-void OW_tickHandler(Unit *unit)
-{
-    struct priv *priv = unit->data;
-    if(!priv->busy) {
-        dbg("ow tick should be disabled now!");
-        return;
-    }
-
-    if (priv->parasitic) {
-        // this is the end of the 750ms measurement time
-        goto halt_ok;
-    } else {
-        bool ready = ow_read_bit(unit);
-        if (ready) {
-            goto halt_ok;
-        }
-
-        uint32_t time = PTIM_GetTime();
-        if (time - priv->busyStart > 1000) {
-            unit->tick_interval = 0;
-            unit->_tick_cnt = 0;
-
-            Job j = {
-                .unit = unit,
-                .data1 = 0, // failure
-                .cb = OW_TimerRespCb,
-            };
-            scheduleJob(&j);
-        }
-    }
-
-    return;
-halt_ok:
-    unit->tick_interval = 0;
-    unit->_tick_cnt = 0;
-
-    Job j = {
-        .unit = unit,
-        .data1 = 1, // success
-        .cb = OW_TimerRespCb,
-    };
-    scheduleJob(&j);
-}
-
-enum PinCmd_ {
-    CMD_CHECK_PRESENCE = 0, // simply tests that any devices are attached
-    CMD_SEARCH_ADDR = 1,    // perform a scan of the bus, retrieving all found device ROMs
-    CMD_SEARCH_ALARM = 2,   // like normal scan, but retrieve only devices with alarm
-    CMD_SEARCH_CONTINUE = 3, // continue the previously started scan, retrieving more devices
-    CMD_READ_ADDR = 4,      // read the ROM code from a single device (for single-device bus)
-
-    CMD_WRITE = 10,    // write multiple bytes using the SKIP_ROM command
-    CMD_READ = 11,   // write multiple bytes using a ROM address
-
-    CMD_POLL_FOR_1 = 20,
-
-    CMD_TEST = 100,
-};
-
-
-/** Handle a request message */
-static error_t OW_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
-{
-    struct priv *priv = unit->data;
-
-    bool presence;
-    uint64_t addr;
-    uint32_t remain;
-    const uint8_t *tail;
-
-    if (priv->busy) return E_BUSY;
-
-    bool with_alarm = false;
-    bool search_reset = false;
-
-    switch (command) {
-        /**
-         * This is the delay function for DS1820 measurements.
-         *
-         * Parasitic: Returns success after the required 750ms
-         * Non-parasitic: Returns SUCCESS after device responds '1', HW_TIMEOUT after 1s
-         */
-        case CMD_POLL_FOR_1:
-            // This can't be exposed via the UU API, due to being async
-            unit->_tick_cnt = 0;
-            unit->tick_interval = 750;
-            if (priv->parasitic) {
-                unit->tick_interval = 750;
-            } else {
-                unit->tick_interval = 10;
-            }
-            priv->busy = true;
-            priv->busyStart = PTIM_GetTime();
-            priv->busyRequestId = frame_id;
-            return E_SUCCESS; // We will respond when the timer expires
-
-        /** Search devices with alarm. No payload, restarts the search. */
-        case CMD_SEARCH_ALARM:
-            with_alarm = true;
-            // fall-through
-        /** Search all devices. No payload, restarts the search. */
-        case CMD_SEARCH_ADDR:
-            search_reset = true;
-            // fall-through
-        /** Continue a previously begun search. */
-        case CMD_SEARCH_CONTINUE:;
-            uint32_t found_count = 0;
-            bool have_more = false;
-            if (!search_reset && priv->searchState.status != OW_SEARCH_MORE) {
-                dbg("Search not ongoing!");
-                return E_PROTOCOL_BREACH;
-            }
-
-            TRY(UU_1WIRE_Search(unit, with_alarm, search_reset,
-                                (void *) unit_tmp512, UNIT_TMP_LEN/8, &found_count,
-                                &have_more));
-
-            // use multipart to avoid allocating extra buffer
-            uint8_t status_code = (uint8_t) have_more;
-            TF_Msg msg = {
-                .frame_id = frame_id,
-                .type = MSG_SUCCESS,
-                .len = (TF_LEN) (found_count * 8 + 1),
-            };
-            TF_Respond_Multipart(comm, &msg);
-            TF_Multipart_Payload(comm, &status_code, 1);
-            // the codes are back-to-back stored inside the buffer, we send it directly
-            // (it's already little-endian, as if built by PayloadBuilder)
-            TF_Multipart_Payload(comm, (uint8_t *) unit_tmp512, found_count * 8);
-            TF_Multipart_Close(comm);
-            return E_SUCCESS;
-
-        /** Simply check presence of any devices on the bus. Responds with SUCCESS or HW_TIMEOUT */
-        case CMD_CHECK_PRESENCE:
-            TRY(UU_1WIRE_CheckPresence(unit, &presence));
-
-            com_respond_u8(frame_id, (uint8_t) presence);
-            return E_SUCCESS;
-
-        /** Read address of the single device on the bus - returns u64 */
-        case CMD_READ_ADDR:
-            TRY(UU_1WIRE_ReadAddress(unit, &addr));
-
-            // build response
-            PayloadBuilder pb = pb_start(unit_tmp512, UNIT_TMP_LEN, NULL);
-            pb_u64(&pb, addr);
-            com_respond_pb(frame_id, MSG_SUCCESS, &pb);
-            return E_SUCCESS;
-
-        /**
-         * Write payload to the bus, no confirmation (unless requested).
-         *
-         * Payload:
-         * addr:u64, rest:write_data
-         * if addr is 0, use SKIP_ROM
-         */
-        case CMD_WRITE:
-            addr = pp_u64(pp);
-            tail = pp_tail(pp, &remain);
-            TRY(UU_1WIRE_Write(unit, addr, tail, remain));
-            return E_SUCCESS;
-
-        /**
-         * Write and read.
-         *
-         * Payload:
-         * addr:u64, read_len:u16, rest:write_data
-         * if addr is 0, use SKIP_ROM
-         */
-        case CMD_READ:
-            addr = pp_u64(pp);
-            uint16_t rcount = pp_u16(pp);
-            bool test_crc = pp_bool(pp);
-            tail = pp_tail(pp, &remain);
-
-            TRY(UU_1WIRE_Read(unit, addr,
-                              tail, remain,
-                              (uint8_t *) unit_tmp512, rcount,
-                              test_crc));
-
-            // build response
-            com_respond_buf(frame_id, MSG_SUCCESS, (uint8_t *) unit_tmp512, rcount);
-            return E_SUCCESS;
-
-        default:
-            return E_UNKNOWN_COMMAND;
-    }
-}
-
-// ------------------------------------------------------------------------
-
-/** Unit template */
-const UnitDriver UNIT_1WIRE = {
-    .name = "1WIRE",
-    .description = "1-Wire master",
-    // Settings
-    .preInit = OW_preInit,
-    .cfgLoadBinary = OW_loadBinary,
-    .cfgWriteBinary = OW_writeBinary,
-    .cfgLoadIni = OW_loadIni,
-    .cfgWriteIni = OW_writeIni,
-    // Init
-    .init = OW_init,
-    .deInit = OW_deInit,
-    // Function
-    .handleRequest = OW_handleRequest,
-    .updateTick = OW_tickHandler,
-};
--- a/units/1wire/unit_1wire.h
+++ b/units/1wire/unit_1wire.h
@ -1,79 +0,0 @@
-//
-// Created by MightyPork on 2018/01/02.
-//
-// Dallas 1-Wire master unit
-//
-
-#ifndef GEX_F072_UNIT_1WIRE_H
-#define GEX_F072_UNIT_1WIRE_H
-
-#include "unit.h"
-
-extern const UnitDriver UNIT_1WIRE;
-
-/**
- * Check if there are any units present on the bus
- *
- * @param[in,out] unit
- * @param[out] presence - any devices present
- * @return success
- */
-error_t UU_1WIRE_CheckPresence(Unit *unit, bool *presence);
-
-/**
- * Read a device's address (use only with a single device attached)
- *
- * @param[in,out] unit
- * @param[out] address - the device's address, 0 on error or CRC mismatch
- * @return success
- */
-error_t UU_1WIRE_ReadAddress(Unit *unit, uint64_t *address);
-
-/**
- * Write bytes to a device / devices
- *
- * @param[in,out] unit
- * @param[in] address - device address, 0 to skip match (single device or broadcast)
- * @param[in] buff - bytes to write
- * @param[in] len - buffer length
- * @return success
- */
-error_t UU_1WIRE_Write(Unit *unit, uint64_t address, const uint8_t *buff, uint32_t len);
-
-/**
- * Read bytes from a device / devices, first writing a query
- *
- * @param[in,out] unit
- * @param[in] address - device address, 0 to skip match (single device ONLY!)
- * @param[in] request_buff - bytes to write before reading a response
- * @param[in] request_len - number of bytes to write
- * @param[out] response_buff - buffer for storing the read response
- * @param[in] response_len - number of bytes to read
- * @param[in] check_crc - verify CRC
- * @return success
- */
-error_t UU_1WIRE_Read(Unit *unit, uint64_t address,
-                      const uint8_t *request_buff, uint32_t request_len,
-                      uint8_t *response_buff, uint32_t response_len, bool check_crc);
-
-/**
- * Perform a ROM search operation.
- * The algorithm is on a depth-first search without backtracking,
- * taking advantage of the open-drain topology.
- *
- * This function either starts the search, or continues it.
- *
- * @param[in,out] unit
- * @param[in] with_alarm - true to match only devices in alarm state
- * @param[in] restart - true to restart the search (search from the lowest address)
- * @param[out] buffer - buffer for storing found addresses
- * @param[in] capacity - buffer capacity in address entries (8 bytes)
- * @param[out] real_count - real number of found addresses (for which the CRC matched)
- * @param[out] have_more - flag indicating there are more devices to be found
- * @return success
- */
-error_t UU_1WIRE_Search(Unit *unit, bool with_alarm, bool restart,
-                        uint64_t *buffer, uint32_t capacity, uint32_t *real_count,
-                        bool *have_more);
-
-#endif //GEX_F072_UNIT_1WIRE_H
--- a/units/adc/_adc_core.c
+++ b/units/adc/_adc_core.c
@ -1,653 +0,0 @@
-//
-// Created by MightyPork on 2018/02/04.
-//
-// The core functionality of the ADC unit is defined here.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-#include "unit_adc.h"
-
-#define ADC_INTERNAL
-#include "_adc_internal.h"
-
-#define DMA_POS(priv) ((priv)->buf_itemcount - (priv)->DMA_CHx->CNDTR)
-
-/**
- * Async job to send a chunk of the DMA buffer to PC.
- * This can't be done directly because the interrupt couldn't wait for the TinyFrame mutex.
- *
- * unit  - unit
- * data1 - start index
- * data2 - number of samples to send
- * data3 - bit flags: 0x80 if this is the last sample and we should close
- *                    0x01 if this was the TC interrupt (otherwise it's HT)
- */
-static void UADC_JobSendBlockChunk(Job *job)
-{
-    Unit *unit = job->unit;
-    struct priv *priv = unit->data;
-
-    const uint32_t start = job->data1;
-    const uint32_t count = job->data2;
-    const bool close = (bool) (job->data3 & 0x80);
-    const bool tc = (bool) (job->data3 & 0x01);
-
-    const TF_TYPE type = close ? EVT_CAPT_DONE : EVT_CAPT_MORE;
-
-    TF_Msg msg = {
-        .frame_id = priv->stream_frame_id,
-        .len = (TF_LEN) (1 /*seq*/ + count * sizeof(uint16_t)),
-        .type = type,
-    };
-    TF_Respond_Multipart(comm, &msg);
-    TF_Multipart_Payload(comm, &priv->stream_serial, 1);
-    TF_Multipart_Payload(comm, (uint8_t *) (priv->dma_buffer + start), count * sizeof(uint16_t));
-    TF_Multipart_Close(comm);
-
-    // Clear the "busy" flags - those are checked in the DMA ISR to detect overrun
-    if (tc) priv->tc_pending = false;
-    else priv->ht_pending = false;
-
-    priv->stream_serial++;
-}
-
-/**
- * Async job to send the trigger header.
- * The header includes info about the trigger + the pre-trigger buffer.
- *
- * data1 - index in the DMA buffer at which the captured data willl start
- * data2 - edge type - 1 rise, 2 fall, 3 forced
- * timestamp - event stamp
- * unit - unit
- */
-static void UADC_JobSendTriggerCaptureHeader(Job *job)
-{
-    Unit *unit = job->unit;
-    struct priv *priv = unit->data;
-
-    EventReport er = {
-        .unit = unit,
-        .type = EVT_CAPT_START,
-        .timestamp = job->timestamp,
-        .length = (priv->pretrig_len + 1) * // see below why +1
-                      priv->nb_channels *
-                      sizeof(uint16_t) +
-                  4 /*pretrig len*/ +
-                  1 /*edge*/ +
-                  1 /* seq */
-    };
-
-    uint32_t index_trigd = job->data1;
-    uint8_t edge = (uint8_t) job->data2;
-
-    EventReport_Start(&er);
-    priv->stream_frame_id = er.sent_msg_id;
-    {
-        // preamble
-        uint8_t buf[4];
-        PayloadBuilder pb = pb_start(buf, 4, NULL);
-        pb_u32(&pb, priv->pretrig_len);
-        pb_u8(&pb, edge);
-        pb_u8(&pb, priv->stream_serial++); // This is the serial counter for the first chunk
-                                           // (containing the pre-trigger, or empty if no pretrig configured)
-        EventReport_PB(&pb);
-
-        if (priv->pretrig_len > 0) {
-            // pretrig
-
-            // +1 because we want pretrig 0 to exactly start with the triggering sample
-            uint32_t pretrig_remain = (priv->pretrig_len + 1) * priv->nb_channels;
-
-            assert_param(index_trigd <= priv->buf_itemcount);
-
-            // this is one past the last entry of the triggering capture group
-            if (pretrig_remain > index_trigd) {
-                // used items in the wrap-around part of the buffer
-                uint32_t items_from_end = pretrig_remain - index_trigd;
-                assert_param(priv->buf_itemcount - items_from_end >= index_trigd);
-
-                EventReport_Data((uint8_t *) &priv->dma_buffer[priv->buf_itemcount - items_from_end],
-                                 items_from_end * sizeof(uint16_t));
-
-                assert_param(items_from_end <= pretrig_remain);
-                pretrig_remain -= items_from_end;
-            }
-
-            assert_param(pretrig_remain <= index_trigd);
-            EventReport_Data((uint8_t *) &priv->dma_buffer[index_trigd - pretrig_remain],
-                             pretrig_remain * sizeof(uint16_t));
-        }
-    }
-    EventReport_End();
-}
-
-/**
- * Async job to notify about end of stream
- */
-static void UADC_JobSendEndOfStreamMsg(Job *job)
-{
-    TF_Msg msg = {
-        .type = EVT_CAPT_DONE,
-        .frame_id = (TF_ID) job->data1
-    };
-    TF_Respond(comm, &msg);
-}
-
-/**
- * Schedule sending a event report to the PC that the current stream has ended.
- * The client library should handle this appropriately.
- */
-void UADC_ReportEndOfStream(Unit *unit)
-{
-    struct priv *priv = unit->data;
-
-    Job j = {
-        .unit = unit,
-        .data1 = priv->stream_frame_id, // copy the ID, it may be invalid by the time the cb gets executed
-        .cb = UADC_JobSendEndOfStreamMsg
-    };
-    scheduleJob(&j);
-}
-
-/**
- * This is a helper function for the ADC DMA interrupt for handing the different interrupt types (half / full transfer).
- * It sends the part of the buffer that was just captured via an async job, or aborts on overrun.
- *
- * It's split off here to allow calling it for the different flags without repeating code.
- *
- * @param unit
- * @param tc - true if this is the TC interrupt, else HT
- */
-static void handle_httc(Unit *unit, bool tc)
-{
-    struct priv *priv = unit->data;
-    uint32_t start = priv->stream_startpos;
-    uint32_t end;
-    const bool ht = !tc;
-
-    const bool m_trigd = priv->opmode == ADC_OPMODE_TRIGD;
-    const bool m_stream = priv->opmode == ADC_OPMODE_STREAM;
-    const bool m_fixcpt = priv->opmode == ADC_OPMODE_BLCAP;
-
-    if (ht) {
-        end = (priv->buf_itemcount / 2);
-    }
-    else {
-        end = priv->buf_itemcount;
-    }
-
-    if (start != end) { // this sometimes happened after a trigger, may be unnecessary now
-        if (end < start) {
-            // this was a trap for a bug with missed TC irq, it's hopefully fixed now
-            trap("end < start! %d < %d, tc %d", (int)end, (int)start, (int)tc);
-        }
-
-        uint32_t sgcount = (end - start) / priv->nb_channels;
-
-        if (m_trigd || m_fixcpt) {
-            sgcount = MIN(priv->trig_stream_remain, sgcount);
-            priv->trig_stream_remain -= sgcount;
-        }
-
-        // Check for the closing condition
-        const bool close = !m_stream && priv->trig_stream_remain == 0;
-
-        if ((tc && priv->tc_pending) || (ht && priv->ht_pending)) {
-            dbg("(!) ADC DMA not handled in time, abort capture");
-            UADC_SwitchMode(unit, ADC_OPMODE_EMERGENCY_SHUTDOWN);
-            return;
-        }
-
-        // Here we set the tc/ht pending flags for detecting overrun
-
-        Job j = {
-            .unit = unit,
-            .data1 = start,
-            .data2 = sgcount * priv->nb_channels,
-            .data3 = (uint32_t) (close*0x80) | (tc*1), // bitfields to indicate what's happening
-            .cb = UADC_JobSendBlockChunk
-        };
-
-        if (tc)
-            priv->tc_pending = true;
-        else
-            priv->ht_pending = true;
-
-        if (!scheduleJob(&j)) {
-            // Abort if we can't queue - the stream would tear and we'd hog the system with error messages
-            UADC_SwitchMode(unit, ADC_OPMODE_EMERGENCY_SHUTDOWN);
-            return;
-        }
-
-        if (close) {
-            // If auto-arm is enabled, we need to re-arm again.
-            // However, EOS irq is disabled during the capture so the trigger edge detection would
-            // work on stale data from before this trigger. We have to wait for the next full
-            // conversion (EOS) before arming.
-            UADC_SwitchMode(unit, (priv->auto_rearm && m_trigd) ? ADC_OPMODE_REARM_PENDING : ADC_OPMODE_IDLE);
-        }
-    }
-
-    // Advance the starting position
-    if (tc) {
-        priv->stream_startpos = 0;
-    }
-    else {
-        priv->stream_startpos = priv->buf_itemcount / 2;
-    }
-}
-
-/**
- * IRQ handler for the DMA flags.
- *
- * We handle flags:
- * TC - transfer complete
- * HT - half transfer
- * TE - transfer error (this should never happen unless there's a bug)
- *
- * The buffer works in a circular mode, so we always handle the previous half
- * or what of it should be sent (if capture started somewhere inside).
- *
- * @param arg - the unit, passed via the irq dispatcher
- */
-void UADC_DMA_Handler(void *arg)
-{
-    Unit *unit = arg;
-    struct priv *priv = unit->data;
-
-    // First thing, grab the flags. They may change during the function.
-    // Working on the live register might cause race conditions.
-    const uint32_t isrsnapshot = priv->DMAx->ISR;
-
-    if (priv->opmode == ADC_OPMODE_UNINIT) {
-        // the IRQ occured while switching mode, clear flags and do nothing else
-        LL_DMA_ClearFlag_HT(priv->DMAx, priv->dma_chnum);
-        LL_DMA_ClearFlag_TC(priv->DMAx, priv->dma_chnum);
-        LL_DMA_ClearFlag_TE(priv->DMAx, priv->dma_chnum);
-        return;
-    }
-
-    if (LL_DMA_IsActiveFlag_G(isrsnapshot, priv->dma_chnum)) {
-        // we have some flags set - check which
-        const bool tc = LL_DMA_IsActiveFlag_TC(isrsnapshot, priv->dma_chnum);
-        const bool ht = LL_DMA_IsActiveFlag_HT(isrsnapshot, priv->dma_chnum);
-        const bool te = LL_DMA_IsActiveFlag_TE(isrsnapshot, priv->dma_chnum);
-
-        if (ht) LL_DMA_ClearFlag_HT(priv->DMAx, priv->dma_chnum);
-        if (tc) LL_DMA_ClearFlag_TC(priv->DMAx, priv->dma_chnum);
-
-        if (te) {
-            // this shouldn't happen - error
-            adc_dbg("ADC DMA TE!");
-            LL_DMA_ClearFlag_TE(priv->DMAx, priv->dma_chnum);
-            return;
-        }
-
-        // check what mode we're in
-        const bool m_trigd = priv->opmode == ADC_OPMODE_TRIGD;
-        const bool m_stream = priv->opmode == ADC_OPMODE_STREAM;
-        const bool m_fixcpt = priv->opmode == ADC_OPMODE_BLCAP;
-        if (m_trigd || m_stream || m_fixcpt) {
-            const uint32_t half = (uint32_t) (priv->buf_itemcount / 2);
-            if (ht && tc) {
-                // dual event interrupt - may happen if we missed both and they were pending after
-                // interrupts became enabled again (this can happen due to the EOS or other higher prio irq's)
-
-                if (priv->stream_startpos > half) {
-                    handle_httc(unit, true); // TC
-                    handle_httc(unit, false); // HT
-                } else {
-                    handle_httc(unit, false); // HT
-                    handle_httc(unit, true); // TC
-                }
-            } else {
-                if (ht && priv->stream_startpos > half) {
-                    // We missed the TC interrupt while e.g. setting up the stream / interrupt. catch up!
-                    // This fixes a bug with "negative size" for report.
-                    handle_httc(unit, true); // TC
-                }
-
-                handle_httc(unit, tc);
-            }
-        } else {
-            // This shouldn't happen, the interrupt should be disabled in this opmode
-            dbg("(!) not streaming, ADC DMA IT should be disabled");
-        }
-    }
-}
-
-/**
- * End of measurement group interrupt handler.
- * This interrupt records the measured values and checks for trigger.
- *
- * @param arg - unit, passed b y irq dispatcher
- */
-void UADC_ADC_EOS_Handler(void *arg)
-{
-    Unit *unit = arg;
-    struct priv *priv = unit->data;
-
-    // Normally
-    uint64_t timestamp = 0;
-    if (priv->opmode == ADC_OPMODE_ARMED) timestamp = PTIM_GetMicrotime();
-
-    LL_ADC_ClearFlag_EOS(priv->ADCx);
-    if (priv->opmode == ADC_OPMODE_UNINIT) return;
-
-    // Wait for the DMA to complete copying the last sample
-    uint32_t dmapos;
-    hw_wait_while((dmapos = DMA_POS(priv)) % priv->nb_channels != 0, 100); // XXX this could be changed to reading it from the DR instead
-
-    uint32_t sample_pos;
-    if (dmapos == 0) {
-        sample_pos = (uint32_t) (priv->buf_itemcount);
-    } else {
-        sample_pos = dmapos;
-    }
-    sample_pos -= priv->nb_channels;
-
-    int cnt = 0; // index of the sample within the group
-
-    const bool can_average = priv->real_frequency_int < UADC_MAX_FREQ_FOR_AVERAGING;
-    const uint32_t channels_mask = priv->channels_mask;
-
-    for (uint8_t i = 0; i < 18; i++) {
-        if (channels_mask & (1 << i)) {
-            const uint16_t val = priv->dma_buffer[sample_pos+cnt];
-            cnt++;
-
-            if (can_average) {
-                priv->averaging_bins[i] =
-                    priv->averaging_bins[i] * (1.0f - priv->avg_factor_as_float) +
-                    ((float) val) * priv->avg_factor_as_float;
-            }
-
-            priv->last_samples[i] = val;
-        }
-    }
-
-    if (priv->opmode == ADC_OPMODE_ARMED) {
-        const uint16_t val =  priv->last_samples[priv->trigger_source];
-
-        if ((priv->trig_prev_level < priv->trig_level) && val >= priv->trig_level && (bool) (priv->trig_edge & 0b01)) {
-            // Rising edge
-            UADC_HandleTrigger(unit, 0b01, timestamp);
-        }
-        else if ((priv->trig_prev_level > priv->trig_level) && val <= priv->trig_level && (bool) (priv->trig_edge & 0b10)) {
-            // Falling edge
-            UADC_HandleTrigger(unit, 0b10, timestamp);
-        }
-        priv->trig_prev_level = val;
-    }
-
-    // auto-rearm was waiting for the next sample
-    if (priv->opmode == ADC_OPMODE_REARM_PENDING) {
-        if (!priv->auto_rearm) {
-            // It looks like the flag was cleared by DISARM before we got a new sample.
-            // Let's just switch to IDLE
-            UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
-        } else {
-            // Re-arming for a new trigger
-            UADC_SwitchMode(unit, ADC_OPMODE_ARMED);
-        }
-    }
-}
-
-/**
- * Handle a detected trigger - start capture if we're not in hold-off
- *
- * @param unit
- * @param edge_type - edge type, is included in the report
- * @param timestamp - event time
- */
-void UADC_HandleTrigger(Unit *unit, uint8_t edge_type, uint64_t timestamp)
-{
-    struct priv *priv = unit->data;
-    if (priv->opmode == ADC_OPMODE_UNINIT) return;
-
-    if (priv->trig_holdoff != 0 && priv->trig_holdoff_remain > 0) {
-        // Trig discarded due to holdoff
-        return;
-    }
-
-    if (priv->trig_holdoff > 0) {
-        priv->trig_holdoff_remain = priv->trig_holdoff;
-        // Start the tick
-        unit->tick_interval = 1;
-        unit->_tick_cnt = 1;
-    }
-
-    priv->stream_startpos = DMA_POS(priv);
-    priv->trig_stream_remain = priv->trig_len;
-    priv->stream_serial = 0;
-
-    // This func may be called from the EOS interrupt, so it's safer to send the header message asynchronously
-    Job j = {
-        .unit = unit,
-        .timestamp = timestamp,
-        .data1 = priv->stream_startpos,
-        .data2 = edge_type,
-        .cb = UADC_JobSendTriggerCaptureHeader
-    };
-    scheduleJob(&j);
-
-    UADC_SwitchMode(unit, ADC_OPMODE_TRIGD);
-}
-
-/**
- * Abort ongoing capture.
- */
-void UADC_AbortCapture(Unit *unit)
-{
-    struct priv *priv = unit->data;
-
-    const enum uadc_opmode old_opmode = priv->opmode;
-
-    priv->auto_rearm = false;
-
-    if (old_opmode == ADC_OPMODE_BLCAP ||
-        old_opmode == ADC_OPMODE_STREAM ||
-        old_opmode == ADC_OPMODE_TRIGD) {
-        UADC_ReportEndOfStream(unit);
-    }
-
-    UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
-}
-
-/**
- * Start a manual block capture.
- *
- * @param unit
- * @param len - number of samples (groups)
- * @param frame_id - TF session to re-use for the report (client has a listener set up)
- */
-void UADC_StartBlockCapture(Unit *unit, uint32_t len, TF_ID frame_id)
-{
-    struct priv *priv = unit->data;
-    if (priv->opmode == ADC_OPMODE_UNINIT) return;
-
-    priv->stream_frame_id = frame_id;
-    priv->stream_startpos = DMA_POS(priv);
-    priv->trig_stream_remain = len;
-    priv->stream_serial = 0;
-    UADC_SwitchMode(unit, ADC_OPMODE_BLCAP);
-}
-
-/**
- * Start a stream
- *
- * @param frame_id - TF session to re-use for the frames (client has a listener set up)
- */
-void UADC_StartStream(Unit *unit, TF_ID frame_id)
-{
-    struct priv *priv = unit->data;
-    if (priv->opmode == ADC_OPMODE_UNINIT) return;
-
-    priv->stream_frame_id = frame_id;
-    UADC_SwitchMode(unit, ADC_OPMODE_STREAM);
-}
-
-/**
- * End a stream by user request.
- */
-void UADC_StopStream(Unit *unit)
-{
-    struct priv *priv = unit->data;
-    if (priv->opmode == ADC_OPMODE_UNINIT) return;
-
-    UADC_ReportEndOfStream(unit);
-    UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
-}
-
-/**
- * Handle unit update tick - expire the trigger hold-off.
- * We also check for the emergency shutdown condition and clear it.
- */
-void UADC_updateTick(Unit *unit)
-{
-    struct priv *priv = unit->data;
-
-    // Recover from shutdown after a delay
-    if (priv->opmode == ADC_OPMODE_EMERGENCY_SHUTDOWN) {
-        adc_dbg("ADC recovering from emergency shutdown");
-
-        UADC_ReportEndOfStream(unit);
-        LL_TIM_EnableCounter(priv->TIMx);
-        UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
-        unit->tick_interval = 0;
-        return;
-    }
-
-    if (priv->trig_holdoff_remain > 0) {
-        priv->trig_holdoff_remain--;
-
-        if (priv->trig_holdoff_remain == 0) {
-            unit->tick_interval = 0;
-            unit->_tick_cnt = 0;
-        }
-    }
-}
-
-/**
- * Switch the ADC operational mode.
- *
- * @param unit
- * @param new_mode - mode to set
- */
-void UADC_SwitchMode(Unit *unit, enum uadc_opmode new_mode)
-{
-    struct priv *priv = unit->data;
-
-    const enum uadc_opmode old_mode = priv->opmode;
-    if (new_mode == old_mode) return; // nothing to do
-
-    // if un-itied, can go only to IDLE
-    assert_param((old_mode != ADC_OPMODE_UNINIT) || (new_mode == ADC_OPMODE_IDLE));
-
-    priv->opmode = ADC_OPMODE_UNINIT;
-
-    if (new_mode == ADC_OPMODE_UNINIT) {
-        adc_dbg("ADC switch -> UNINIT");
-        // Stop the DMA, timer and disable ADC - this is called before tearing down the unit
-        LL_TIM_DisableCounter(priv->TIMx);
-        LL_ADC_ClearFlag_EOS(priv->ADCx);
-        LL_ADC_DisableIT_EOS(priv->ADCx);
-
-        // Switch off the ADC
-        if (LL_ADC_IsEnabled(priv->ADCx)) {
-            // Cancel ongoing conversion
-            if (LL_ADC_REG_IsConversionOngoing(priv->ADCx)) {
-                LL_ADC_REG_StopConversion(priv->ADCx);
-                hw_wait_while(LL_ADC_REG_IsStopConversionOngoing(priv->ADCx), 100);
-            }
-
-            LL_ADC_Disable(priv->ADCx);
-            hw_wait_while(LL_ADC_IsDisableOngoing(priv->ADCx), 100);
-        }
-
-        LL_DMA_DisableChannel(priv->DMAx, priv->dma_chnum);
-        LL_DMA_DisableIT_HT(priv->DMAx, priv->dma_chnum);
-        LL_DMA_DisableIT_TC(priv->DMAx, priv->dma_chnum);
-        LL_DMA_ClearFlag_HT(priv->DMAx, priv->dma_chnum);
-        LL_DMA_ClearFlag_TC(priv->DMAx, priv->dma_chnum);
-    }
-    else if (new_mode == ADC_OPMODE_IDLE || new_mode == ADC_OPMODE_REARM_PENDING) {
-        // IDLE and ARMED are identical with the exception that the trigger condition is not checked
-        // ARMED can be only entered from IDLE, thus we do the init only here.
-
-        priv->tc_pending = false;
-        priv->ht_pending = false;
-
-        // In IDLE, we don't need the DMA interrupts
-        LL_DMA_ClearFlag_HT(priv->DMAx, priv->dma_chnum);
-        LL_DMA_ClearFlag_TC(priv->DMAx, priv->dma_chnum);
-        LL_DMA_DisableIT_HT(priv->DMAx, priv->dma_chnum);
-        LL_DMA_DisableIT_TC(priv->DMAx, priv->dma_chnum);
-
-        // Use End Of Sequence to recover results for averaging from the DMA buffer and DR
-        LL_ADC_ClearFlag_EOS(priv->ADCx);
-        LL_ADC_EnableIT_EOS(priv->ADCx);
-
-        if (old_mode == ADC_OPMODE_UNINIT) {
-            // Nothing is started yet - this is the only way to leave UNINIT
-            LL_ADC_Enable(priv->ADCx);
-            LL_DMA_EnableChannel(priv->DMAx, priv->dma_chnum);
-            LL_TIM_EnableCounter(priv->TIMx);
-
-            LL_ADC_REG_StartConversion(priv->ADCx);
-        }
-    }
-    else if (new_mode == ADC_OPMODE_EMERGENCY_SHUTDOWN) {
-        adc_dbg("ADC switch -> EMERGENCY_STOP");
-        // Emergency shutdown is used when the job queue overflows and the stream is torn
-        // This however doesn't help in the case when user sets such a high frequency
-        // that the whole app becomes unresponsive due to the completion ISR, need to verify the value manually.
-
-        LL_DMA_ClearFlag_HT(priv->DMAx, priv->dma_chnum);
-        LL_DMA_ClearFlag_TC(priv->DMAx, priv->dma_chnum);
-        LL_DMA_DisableIT_HT(priv->DMAx, priv->dma_chnum);
-        LL_DMA_DisableIT_TC(priv->DMAx, priv->dma_chnum);
-
-        LL_TIM_DisableCounter(priv->TIMx);
-        UADC_SetSampleRate(unit, 10000); // fallback to a known safe value
-
-        LL_ADC_ClearFlag_EOS(priv->ADCx);
-        LL_ADC_DisableIT_EOS(priv->ADCx);
-
-        unit->tick_interval = 0;
-        unit->_tick_cnt = 250; // 1-off
-    }
-    else if (new_mode == ADC_OPMODE_ARMED) {
-        adc_dbg("ADC switch -> ARMED");
-        assert_param(old_mode == ADC_OPMODE_IDLE || old_mode == ADC_OPMODE_REARM_PENDING);
-
-        // avoid firing immediately by the value jumping across the scale
-        priv->trig_prev_level = priv->last_samples[priv->trigger_source];
-    }
-    else if (new_mode == ADC_OPMODE_TRIGD || new_mode == ADC_OPMODE_STREAM || new_mode == ADC_OPMODE_BLCAP) {
-        adc_dbg("ADC switch -> CAPTURE");
-
-        assert_param(old_mode == ADC_OPMODE_ARMED || old_mode == ADC_OPMODE_IDLE);
-
-        // during the capture, we disallow direct readout and averaging to reduce overhead
-        LL_ADC_DisableIT_EOS(priv->ADCx);
-
-        // Enable the DMA buffer interrupts
-
-        // we must first clear the flags, otherwise it will cause WEIRD bugs in the handler
-        LL_DMA_ClearFlag_HT(priv->DMAx, priv->dma_chnum);
-        LL_DMA_ClearFlag_TC(priv->DMAx, priv->dma_chnum);
-
-        // those must be as close as possible to the enabling
-        // if not trig'd, we don't care for lost samples before (this could cause a DMA irq miss / ht/tc mismatch with the startpos)
-        if (new_mode != ADC_OPMODE_TRIGD) {
-            priv->stream_startpos = DMA_POS(priv);
-            priv->stream_serial = 0;
-        }
-        LL_DMA_EnableIT_HT(priv->DMAx, priv->dma_chnum);
-        LL_DMA_EnableIT_TC(priv->DMAx, priv->dma_chnum);
-    }
-
-    priv->opmode = new_mode;
-}
--- a/units/adc/_adc_init.c
+++ b/units/adc/_adc_init.c
@ -1,264 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-// ADC unit init and de-init functions
-//
-
-#include "platform.h"
-#include "unit_base.h"
-
-#define ADC_INTERNAL
-#include "_adc_internal.h"
-
-/** Allocate data structure and set defaults */
-error_t UADC_preInit(Unit *unit)
-{
-    struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
-    if (priv == NULL) return E_OUT_OF_MEM;
-
-    priv->cfg.channels = 1<<16; // Tsense by default - always available, easy testing
-    priv->cfg.sample_time = 0b010; // 13.5c - good enough and the default 0b00 value really is useless
-    priv->cfg.frequency = 1000;
-    priv->cfg.buffer_size = 256; // in half-words
-    priv->cfg.averaging_factor = 500; // 0.5
-
-    priv->opmode = ADC_OPMODE_UNINIT;
-
-    return E_SUCCESS;
-}
-
-
-/** Configure frequency */
-error_t UADC_SetSampleRate(Unit *unit, uint32_t hertz)
-{
-    struct priv *priv = unit->data;
-
-    uint16_t presc;
-    uint32_t count;
-    if (!hw_solve_timer(PLAT_APB1_HZ, hertz, true, &presc, &count, &priv->real_frequency)) {
-        dbg("Failed to resolve timer params.");
-        return E_BAD_VALUE;
-    }
-    adc_dbg("Frequency error %d ppm, presc %d, count %d",
-        (int) lrintf(1000000.0f *  ((priv->real_frequency - hertz) / (float) hertz)),
-        (int) presc, (int) count);
-
-    LL_TIM_SetPrescaler(priv->TIMx, (uint32_t) (presc - 1));
-    LL_TIM_SetAutoReload(priv->TIMx, count - 1);
-
-    priv->real_frequency_int = hertz;
-
-    return E_SUCCESS;
-}
-
-/**
- * Set up the ADC DMA.
- * This is split to its own function because it's also called when the user adjusts the
- * enabled channels and we need to re-configure it.
- *
- * @param unit
- */
-void UADC_SetupDMA(Unit *unit)
-{
-    struct priv *priv = unit->data;
-
-    adc_dbg("Setting up DMA");
-    {
-        uint32_t itemcount = priv->nb_channels * (priv->cfg.buffer_size / (priv->nb_channels));
-        if (itemcount % 2 == 1) itemcount -= priv->nb_channels; // ensure the count is even
-        priv->buf_itemcount = itemcount;
-
-        adc_dbg("DMA item count is %d (%d bytes), There are %d samples per group.",
-                (int)priv->buf_itemcount,
-                (int)(priv->buf_itemcount * sizeof(uint16_t)),
-                (int)priv->nb_channels);
-
-        {
-            LL_DMA_InitTypeDef init;
-            LL_DMA_StructInit(&init);
-            init.Direction = LL_DMA_DIRECTION_PERIPH_TO_MEMORY;
-
-            init.Mode = LL_DMA_MODE_CIRCULAR;
-            init.NbData = itemcount;
-
-            init.PeriphOrM2MSrcAddress = (uint32_t) &priv->ADCx->DR;
-            init.PeriphOrM2MSrcDataSize = LL_DMA_PDATAALIGN_HALFWORD;
-            init.PeriphOrM2MSrcIncMode = LL_DMA_PERIPH_NOINCREMENT;
-
-            init.MemoryOrM2MDstAddress = (uint32_t) priv->dma_buffer;
-            init.MemoryOrM2MDstDataSize = LL_DMA_MDATAALIGN_HALFWORD;
-            init.MemoryOrM2MDstIncMode = LL_DMA_MEMORY_INCREMENT;
-
-            assert_param(SUCCESS == LL_DMA_Init(priv->DMAx, priv->dma_chnum, &init));
-        }
-
-//        LL_DMA_EnableChannel(priv->DMAx, priv->dma_chnum); // this is done in the switch mode func now
-    }
-}
-
-/** Finalize unit set-up */
-error_t UADC_init(Unit *unit)
-{
-    bool suc = true;
-    struct priv *priv = unit->data;
-
-    // Written for F072 which has only one ADC
-
-    TRY(rsc_claim(unit, R_ADC1));
-    TRY(rsc_claim(unit, R_DMA1_1));
-    TRY(rsc_claim(unit, R_TIM15));
-
-    priv->DMAx = DMA1;
-    priv->DMA_CHx = DMA1_Channel1;
-    priv->dma_chnum = 1;
-    priv->ADCx = ADC1;
-    priv->ADCx_Common = ADC1_COMMON;
-    priv->TIMx = TIM15;
-
-    // ----------------------- CONFIGURE PINS --------------------------
-    {
-        // Claim and configure all analog pins
-        priv->nb_channels = 0;
-        for (uint8_t i = 0; i <= UADC_MAX_CHANNEL; i++) {
-            if (priv->cfg.channels & (1 << i)) {
-                priv->nb_channels++;
-
-                char c;
-                uint8_t num;
-                if (i <= 7) {
-                    c = 'A';
-                    num = i;
-                }
-                else if (i <= 9) {
-                    c = 'B';
-                    num = (uint8_t) (i - 8);
-                }
-                else if (i <= 15) {
-                    c = 'C';
-                    num = (uint8_t) (i - 10);
-                } else {
-                    break;
-                }
-
-                TRY(rsc_claim_pin(unit, c, num));
-                uint32_t ll_pin = hw_pin2ll(num, &suc);
-                GPIO_TypeDef *port = hw_port2periph(c, &suc);
-                assert_param(suc);
-
-                LL_GPIO_SetPinPull(port, ll_pin, LL_GPIO_PULL_NO);
-                LL_GPIO_SetPinMode(port, ll_pin, LL_GPIO_MODE_ANALOG);
-            }
-        }
-
-        if (priv->nb_channels == 0) {
-            dbg("Need at least 1 channel");
-            return E_BAD_CONFIG;
-        }
-
-        // ensure some minimal space is available
-        if (priv->cfg.buffer_size < priv->nb_channels * 2) {
-            dbg("Insufficient buf size");
-            return E_BAD_CONFIG;
-        }
-    }
-
-    // ---------------- Alloc the buffer ----------------------
-    adc_dbg("Allocating buffer of size %d half-words", (int)priv->cfg.buffer_size);
-    priv->dma_buffer = calloc_ck(priv->cfg.buffer_size, sizeof(uint16_t));
-    if (NULL == priv->dma_buffer) return E_OUT_OF_MEM;
-    assert_param(((uint32_t) priv->dma_buffer & 3) == 0); // must be aligned
-
-    // ------------------- ENABLE CLOCKS --------------------------
-    {
-        // enable peripherals clock
-        hw_periph_clock_enable(priv->ADCx);
-        hw_periph_clock_enable(priv->TIMx);
-        // DMA and GPIO clocks are enabled on startup automatically
-    }
-
-    // ------------------- CONFIGURE THE TIMER --------------------------
-    adc_dbg("Setting up TIMER");
-    {
-        TRY(UADC_SetSampleRate(unit, priv->cfg.frequency));
-
-        LL_TIM_EnableARRPreload(priv->TIMx);
-        LL_TIM_EnableUpdateEvent(priv->TIMx);
-        LL_TIM_SetTriggerOutput(priv->TIMx, LL_TIM_TRGO_UPDATE);
-        LL_TIM_GenerateEvent_UPDATE(priv->TIMx); // load the prescaller value
-    }
-
-    // --------------------- CONFIGURE THE ADC ---------------------------
-    adc_dbg("Setting up ADC");
-    {
-        // Calibrate the ADC
-        adc_dbg("Wait for calib");
-        LL_ADC_StartCalibration(priv->ADCx);
-        while (LL_ADC_IsCalibrationOnGoing(priv->ADCx)) {}
-        adc_dbg("ADC calibrated.");
-
-        // Let's just enable the internal channels always - makes toggling them on-line easier
-        LL_ADC_SetCommonPathInternalCh(priv->ADCx_Common, LL_ADC_PATH_INTERNAL_VREFINT | LL_ADC_PATH_INTERNAL_TEMPSENSOR);
-
-        LL_ADC_SetDataAlignment(priv->ADCx, LL_ADC_DATA_ALIGN_RIGHT);
-        LL_ADC_SetResolution(priv->ADCx, LL_ADC_RESOLUTION_12B);
-        LL_ADC_REG_SetDMATransfer(priv->ADCx, LL_ADC_REG_DMA_TRANSFER_UNLIMITED);
-
-        // configure channels
-        priv->channels_mask = priv->cfg.channels;
-
-        priv->ADCx->CHSELR = priv->channels_mask;
-
-        LL_ADC_REG_SetTriggerSource(priv->ADCx, LL_ADC_REG_TRIG_EXT_TIM15_TRGO);
-
-        LL_ADC_SetSamplingTimeCommonChannels(priv->ADCx, LL_ADC_SAMPLETIMES[priv->cfg.sample_time]);
-
-        // will be enabled when switching to INIT mode
-    }
-
-    // --------------------- CONFIGURE DMA -------------------------------
-    UADC_SetupDMA(unit);
-
-    // prepare the avg factor float for the ISR
-    if (priv->cfg.averaging_factor > 1000) priv->cfg.averaging_factor = 1000; // normalize
-    priv->avg_factor_as_float = priv->cfg.averaging_factor/1000.0f;
-
-    adc_dbg("ADC peripherals configured.");
-
-    irqd_attach(priv->DMA_CHx, UADC_DMA_Handler, unit);
-    irqd_attach(priv->ADCx, UADC_ADC_EOS_Handler, unit);
-    adc_dbg("irqs attached");
-
-    UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
-    adc_dbg("ADC done");
-
-    return E_SUCCESS;
-}
-
-/** Tear down the unit */
-void UADC_deInit(Unit *unit)
-{
-    struct priv *priv = unit->data;
-
-    // de-init peripherals
-    if (unit->status == E_SUCCESS ) {
-        UADC_SwitchMode(unit, ADC_OPMODE_UNINIT);
-
-        //LL_ADC_DeInit(priv->ADCx);
-        LL_ADC_CommonDeInit(priv->ADCx_Common);
-        LL_TIM_DeInit(priv->TIMx);
-
-        irqd_detach(priv->DMA_CHx, UADC_DMA_Handler);
-        irqd_detach(priv->ADCx, UADC_ADC_EOS_Handler);
-
-        LL_DMA_DeInit(priv->DMAx, priv->dma_chnum);
-    }
-
-    // free buffer if not NULL
-    free_ck(priv->dma_buffer);
-
-    // Release all resources, deinit pins
-    rsc_teardown(unit);
-
-    // Free memory
-    free_ck(unit->data);
-}
--- a/units/adc/_adc_internal.h
+++ b/units/adc/_adc_internal.h
@ -1,158 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-// Defines and prototypes used internally by the ADC unit.
-//
-
-#ifndef GEX_F072_ADC_INTERNAL_H
-#define GEX_F072_ADC_INTERNAL_H
-
-#ifndef ADC_INTERNAL
-#error bad include!
-#endif
-
-#include "unit_base.h"
-
-//#define adc_dbg dbg
-#define adc_dbg(...) do {} while(0)
-
-#define UADC_MAX_FREQ_FOR_AVERAGING 20000
-
-#define UADC_MAX_CHANNEL 17
-
-enum uadc_opmode {
-    ADC_OPMODE_UNINIT, //!< Not yet switched to any mode
-    ADC_OPMODE_IDLE,   //!< Idle. Allows immediate value readout and averaging.
-    ADC_OPMODE_REARM_PENDING, //!< Idle, waiting for the next sample to re-arm (auto trigger).
-    ADC_OPMODE_ARMED,  //!< Armed for a trigger. Direct access and averaging are disabled.
-    ADC_OPMODE_TRIGD,  //!< Triggered, sending pre-trigger and streaming captured data.
-    ADC_OPMODE_BLCAP,  //!< Capture of fixed length without a trigger
-    ADC_OPMODE_STREAM, //!< Unlimited capture
-    ADC_OPMODE_EMERGENCY_SHUTDOWN, //!< Used when the buffers overrun to safely transition to IDLE after a delay
-};
-
-enum uadc_event {
-    EVT_CAPT_START = 50,  //!< Capture start (used in event in the first frame when trigger is detected)
-    EVT_CAPT_MORE = 51,   //!< Capture data payload (used as TYPE for all capture types)
-    EVT_CAPT_DONE = 52,   //!< End of trig'd or block capture payload (last frame with data),
-                          //!<   or a farewell message after closing stream using abort(), in this case without data.
-};
-
-/** Private data structure */
-struct priv {
-    struct {
-        uint32_t channels;    //!< bit flags (will be recorded in order 0-15)
-        uint8_t sample_time;  //!< 0-7 (corresponds to 1.5-239.5 cycles) - time for the sampling capacitor to charge
-        uint32_t frequency;   //!< Timer frequency in Hz. Note: not all frequencies can be achieved accurately
-        uint32_t buffer_size; //!< Buffer size in bytes (count 2 bytes per channel per measurement) - faster sampling freq needs bigger buffer
-        uint16_t averaging_factor;  //!< Exponential averaging factor 0-1000
-    } cfg;
-
-    // Peripherals
-    ADC_TypeDef *ADCx; //!< The ADC peripheral used
-    ADC_Common_TypeDef *ADCx_Common; //!< The ADC common control block
-    TIM_TypeDef *TIMx; //!< ADC timing timer instance
-    DMA_TypeDef *DMAx; //!< DMA isnatnce used
-    uint8_t dma_chnum; //!< DMA channel number
-    DMA_Channel_TypeDef *DMA_CHx; //!< DMA channel instance
-
-    // Live config
-    float real_frequency;
-    uint32_t real_frequency_int;
-    uint32_t channels_mask; //!< channels bitfield including tsense and vref
-    float avg_factor_as_float;
-
-    uint16_t *dma_buffer; //!< malloc'd buffer for the samples
-    uint8_t nb_channels; //!< nbr of enabled adc channels
-    uint32_t buf_itemcount;  //!< real size of the buffer in samples (adjusted to fit 2x whole multiple of sample group)
-
-    // Trigger state
-    uint32_t trig_stream_remain;   //!< Counter of samples remaining to be sent in the post-trigger stream
-    uint16_t trig_holdoff_remain;  //!< Tmp counter for the currently active hold-off
-    uint16_t trig_prev_level;      //!< Value of the previous sample, used to detect trigger edge
-    uint32_t stream_startpos; //!< Byte offset in the DMA buffer where the next capture for a stream should start.
-                              //!<   Updated in TH/TC and on trigger (after the preceding data is sent as a pretrig buffer)
-
-    enum uadc_opmode opmode;  //!< OpMode (state machine state)
-    float averaging_bins[18]; //!< Averaging buffers, enough space to accommodate all channels (16 external + 2 internal)
-    uint16_t last_samples[18]; //!< If averaging is disabled, the last captured sample is stored here.
-
-    // Trigger config
-    uint8_t trigger_source;   //!< number of the pin selected as a trigger source
-    uint32_t pretrig_len;     //!< Pre-trigger length, nbr of historical samples to report when trigger occurs
-    uint32_t trig_len;        //!< Trigger length, nbr of samples to report AFTER a trigger occurs
-    uint16_t trig_level;      //!< Triggering level in LSB
-    uint8_t  trig_edge;       //!< Which edge we want to trigger on. 1-rising, 2-falling, 3-both
-    bool auto_rearm;          //!< Flag that the trigger should be re-armed after the stream finishes
-    uint16_t trig_holdoff;    //!< Trigger hold-off time, set when configuring the trigger
-    TF_ID stream_frame_id;    //!< Session ID for multi-part stream (response or report)
-    uint8_t stream_serial;    //!< Serial nr of a stream frame
-
-    bool tc_pending;
-    bool ht_pending;
-};
-
-/** Allocate data structure and set defaults */
-error_t UADC_preInit(Unit *unit);
-
-/** Load from a binary buffer stored in Flash */
-void UADC_loadBinary(Unit *unit, PayloadParser *pp);
-
-/** Write to a binary buffer for storing in Flash */
-void UADC_writeBinary(Unit *unit, PayloadBuilder *pb);
-
-// ------------------------------------------------------------------------
-
-/** Parse a key-value pair from the INI file */
-error_t UADC_loadIni(Unit *unit, const char *key, const char *value);
-
-/** Generate INI file section for the unit */
-void UADC_writeIni(Unit *unit, IniWriter *iw);
-
-// ------------------------------------------------------------------------
-
-/** Finalize unit set-up */
-error_t UADC_init(Unit *unit);
-
-/** Tear down the unit */
-void UADC_deInit(Unit *unit);
-
-/** Configure DMA (buffer count etc) */
-void UADC_SetupDMA(Unit *unit);
-
-// ------------------------------------------------------------------------
-
-/** DMA half/complete handler */
-void UADC_DMA_Handler(void *arg);
-
-/** ADC eod of sequence handler */
-void UADC_ADC_EOS_Handler(void *arg);
-
-/** Switch to a different opmode */
-void UADC_SwitchMode(Unit *unit, enum uadc_opmode new_mode);
-
-/** Handle trigger - process pre-trigger and start streaming the requested number of samples */
-void UADC_HandleTrigger(Unit *unit, uint8_t edge_type, uint64_t timestamp);
-
-/** Handle a periodic tick - expiring the hold-off */
-void UADC_updateTick(Unit *unit);
-
-/** Send a end-of-stream message to PC's stream listener so it can shut down. */
-void UADC_ReportEndOfStream(Unit *unit);
-
-/** Start a block capture */
-void UADC_StartBlockCapture(Unit *unit, uint32_t len, TF_ID frame_id);
-
-/** Start stream */
-void UADC_StartStream(Unit *unit, TF_ID frame_id);
-
-/** End stream */
-void UADC_StopStream(Unit *unit);
-
-/** Configure frequency */
-error_t UADC_SetSampleRate(Unit *unit, uint32_t hertz);
-
-/** Abort capture */
-void UADC_AbortCapture(Unit *unit);
-
-#endif //GEX_F072_ADC_INTERNAL_H
--- a/units/adc/_adc_settings.c
+++ b/units/adc/_adc_settings.c
@ -1,106 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-// ADC unit settings reading / parsing
-//
-
-#include "platform.h"
-#include "unit_base.h"
-
-#define ADC_INTERNAL
-#include "_adc_internal.h"
-
-/** Load from a binary buffer stored in Flash */
-void UADC_loadBinary(Unit *unit, PayloadParser *pp)
-{
-    struct priv *priv = unit->data;
-
-    uint8_t version = pp_u8(pp);
-    (void)version;
-
-    priv->cfg.channels = pp_u32(pp);
-    priv->cfg.sample_time = pp_u8(pp);
-    priv->cfg.frequency = pp_u32(pp);
-    priv->cfg.buffer_size = pp_u32(pp);
-    priv->cfg.averaging_factor = pp_u16(pp);
-}
-
-/** Write to a binary buffer for storing in Flash */
-void UADC_writeBinary(Unit *unit, PayloadBuilder *pb)
-{
-    struct priv *priv = unit->data;
-
-    pb_u8(pb, 0); // version
-
-    pb_u32(pb, priv->cfg.channels);
-    pb_u8(pb, priv->cfg.sample_time);
-    pb_u32(pb, priv->cfg.frequency);
-    pb_u32(pb, priv->cfg.buffer_size);
-    pb_u16(pb, priv->cfg.averaging_factor);
-}
-
-// ------------------------------------------------------------------------
-
-/** Parse a key-value pair from the INI file */
-error_t UADC_loadIni(Unit *unit, const char *key, const char *value)
-{
-    bool suc = true;
-    struct priv *priv = unit->data;
-
-    if (streq(key, "channels")) {
-        priv->cfg.channels = cfg_pinmask_parse_32(value, &suc);
-    }
-    else if (streq(key, "sample_time")) {
-        priv->cfg.sample_time = cfg_u8_parse(value, &suc);
-        if (priv->cfg.sample_time > 7) return E_BAD_VALUE;
-    }
-    else if (streq(key, "frequency")) {
-        priv->cfg.frequency = cfg_u32_parse(value, &suc);
-    }
-    else if (streq(key, "buffer_size")) {
-        priv->cfg.buffer_size = cfg_u32_parse(value, &suc);
-    }
-    else if (streq(key, "avg_factor")) {
-        priv->cfg.averaging_factor = cfg_u16_parse(value, &suc);
-        if (priv->cfg.averaging_factor > 1000) return E_BAD_VALUE;
-    }
-    else {
-        return E_BAD_KEY;
-    }
-
-    if (!suc) return E_BAD_VALUE;
-    return E_SUCCESS;
-}
-
-/** Generate INI file section for the unit */
-void UADC_writeIni(Unit *unit, IniWriter *iw)
-{
-    struct priv *priv = unit->data;
-
-    iw_comment(iw, "Enabled channels, comma separated");
-    iw_comment(iw, " 0  1  2  3  4  5  6  7    8  9   10 11 12 13 14 15   16    17");
-    iw_comment(iw, "A0 A1 A2 A3 A4 A5 A6 A7   B0 B1   C0 C1 C2 C3 C4 C5   Tsens Vref");
-    iw_entry_s(iw, "channels", cfg_pinmask_encode(priv->cfg.channels, unit_tmp512, true));
-
-    iw_cmt_newline(iw);
-    iw_comment(iw, "Sampling time (0-7)");
-    iw_entry_d(iw, "sample_time", priv->cfg.sample_time);
-
-    iw_comment(iw, "Sampling frequency (Hz)");
-    iw_entry_d(iw, "frequency", priv->cfg.frequency);
-
-    iw_cmt_newline(iw);
-    iw_comment(iw, "Sample buffer size");
-    iw_comment(iw, "- shared by all enabled channels");
-    iw_comment(iw, "- defines the maximum pre-trigger size (divide by # of channels)");
-    iw_comment(iw, "- captured data is sent in half-buffer chunks");
-    iw_comment(iw, "- buffer overrun aborts the data capture");
-    iw_entry_d(iw, "buffer_size", priv->cfg.buffer_size);
-
-    iw_cmt_newline(iw);
-    iw_comment(iw, "Exponential averaging coefficient (permil, range 0-1000 ~ 0.000-1.000)");
-    iw_comment(iw, "- used formula: y[t]=(1-k)*y[t-1]+k*u[t]");
-    iw_comment(iw, "- not available when a capture is running");
-    iw_entry_d(iw, "avg_factor", priv->cfg.averaging_factor);
-}
-
--- a/units/adc/unit_adc.c
+++ b/units/adc/unit_adc.c
@ -1,405 +0,0 @@
-//
-// Created by MightyPork on 2017/11/25.
-//
-
-#include "unit_base.h"
-#include "unit_adc.h"
-
-#define ADC_INTERNAL
-#include "_adc_internal.h"
-
-// ------------------------------------------------------------------------
-
-enum AdcCmd_ {
-    CMD_READ_RAW = 0,
-    CMD_READ_SMOOTHED = 1,
-
-    CMD_GET_ENABLED_CHANNELS = 10,
-    CMD_GET_SAMPLE_RATE = 11,
-
-    CMD_SETUP_TRIGGER = 20,
-    CMD_ARM = 21,
-    CMD_DISARM = 22,
-    CMD_ABORT = 23, // abort any ongoing capture or stream
-    CMD_FORCE_TRIGGER = 24,
-    CMD_BLOCK_CAPTURE = 25,
-    CMD_STREAM_START = 26,
-    CMD_STREAM_STOP = 27,
-    CMD_SET_SMOOTHING_FACTOR = 28,
-    CMD_SET_SAMPLE_RATE = 29,
-    CMD_ENABLE_CHANNELS = 30,
-    CMD_SET_SAMPLE_TIME = 31,
-};
-
-/** Handle a request message */
-static error_t UADC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
-{
-    struct priv *priv = unit->data;
-    PayloadBuilder pb = pb_start(unit_tmp512, UNIT_TMP_LEN, NULL);
-
-    switch (command) {
-        /**
-         * Get enabled channels.
-         * Response: bytes with indices of enabled channels, ascending order.
-         */
-        case CMD_GET_ENABLED_CHANNELS:
-            for (uint8_t i = 0; i < 18; i++) {
-                if (priv->channels_mask & (1 << i)) {
-                    pb_u8(&pb, i);
-                }
-            }
-            com_respond_pb(frame_id, MSG_SUCCESS, &pb);
-            return E_SUCCESS;
-
-        /**
-         * Set the sample rate in Hz
-         * plad: hz:u32
-         */
-        case CMD_SET_SAMPLE_RATE:
-            {
-                uint32_t freq = pp_u32(pp);
-                if (freq == 0) return E_BAD_VALUE;
-
-                TRY(UADC_SetSampleRate(unit, freq));
-            }
-            // Pass through - send back the obtained sample rate
-        /**
-         * Read the real used frequency, expressed as float.
-         * May differ from the configured or requested value due to prescaller limitations.
-         */
-        case CMD_GET_SAMPLE_RATE:
-            pb_u32(&pb, priv->real_frequency_int);
-            pb_float(&pb, priv->real_frequency);
-            com_respond_pb(frame_id, MSG_SUCCESS, &pb);
-            return E_SUCCESS;
-
-        /**
-         * Set smoothing factor 0-1000.
-         * pld: u16:factor
-         */
-        case CMD_SET_SMOOTHING_FACTOR:
-            {
-                uint16_t fac = pp_u16(pp);
-                if (fac > 1000) return E_BAD_VALUE;
-                priv->avg_factor_as_float = fac / 1000.0f;
-            }
-            return E_SUCCESS;
-
-        /**
-         * Set sample time
-         * pld: u8:0-7
-         */
-        case CMD_SET_SAMPLE_TIME:
-            {
-                uint8_t tim = pp_u8(pp);
-                if (tim > 7) return E_BAD_VALUE;
-                UADC_SwitchMode(unit, ADC_OPMODE_UNINIT);
-                {
-                    LL_ADC_SetSamplingTimeCommonChannels(priv->ADCx, LL_ADC_SAMPLETIMES[tim]);
-                }
-                UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
-            }
-            return E_SUCCESS;
-
-        /**
-         * Enable channels. The channels must've been configured in the settings (except ch 16 and 17 which are available always)
-         * pld: u32: bitmap of channels
-         */
-        case CMD_ENABLE_CHANNELS:
-            {
-                uint32_t new_channels = pp_u32(pp);
-
-                // this tears down the peripherals sufficiently so we can re-configure them. Going back to IDLE re-inits this
-                UADC_SwitchMode(unit, ADC_OPMODE_UNINIT);
-
-                uint32_t illegal_channels = new_channels & ~(priv->cfg.channels | (1<<16) | (1<<17)); // 16 and 17 may be enabled always
-                if (illegal_channels != 0) {
-                    com_respond_str(MSG_ERROR, frame_id, "Some requested channels not available");
-                    UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
-                    return E_FAILURE;
-                }
-
-                uint8_t nb_channels = 0;
-                // count the enabled channels
-                for(int i = 0; i < 32; i++) {
-                    if (new_channels & (1<<i)) {
-                        nb_channels++;
-                    }
-                }
-
-                if (nb_channels == 0) {
-                    com_respond_str(MSG_ERROR, frame_id, "Need at least 1 channel");
-                    UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
-                    return E_FAILURE;
-                }
-
-                if (priv->cfg.buffer_size < nb_channels * 2) {
-                    com_respond_str(MSG_ERROR, frame_id, "Insufficient buf size");
-                    UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
-                    return E_BAD_CONFIG;
-                }
-
-                priv->nb_channels = nb_channels;
-                priv->ADCx->CHSELR = new_channels; // apply it to the ADC
-                priv->channels_mask = new_channels;
-
-                UADC_SetupDMA(unit);
-                UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
-            }
-            return E_SUCCESS;
-
-        /**
-         * Read raw values from the last measurement.
-         * Response: interleaved (u8:channel, u16:value) for all channels
-         */
-        case CMD_READ_RAW:
-            if(priv->opmode != ADC_OPMODE_IDLE && priv->opmode != ADC_OPMODE_ARMED) {
-                return E_BUSY;
-            }
-
-            for (uint8_t i = 0; i < 18; i++) {
-                if (priv->channels_mask & (1 << i)) {
-                    pb_u16(&pb, priv->last_samples[i]);
-                }
-            }
-            com_respond_pb(frame_id, MSG_SUCCESS, &pb);
-            return E_SUCCESS;
-
-        /**
-         * Read smoothed values.
-         * Response: interleaved (u8:channel, f32:value) for all channels
-         */
-        case CMD_READ_SMOOTHED:
-            if(priv->opmode != ADC_OPMODE_IDLE && priv->opmode != ADC_OPMODE_ARMED) {
-                return E_BUSY;
-            }
-
-            if (priv->real_frequency_int > UADC_MAX_FREQ_FOR_AVERAGING) {
-                com_respond_str(MSG_ERROR, frame_id, "Too fast for smoothing");
-                return E_FAILURE;
-            }
-
-            for (uint8_t i = 0; i < 18; i++) {
-                if (priv->channels_mask & (1 << i)) {
-                    pb_float(&pb, priv->averaging_bins[i]);
-                }
-            }
-            com_respond_pb(frame_id, MSG_SUCCESS, &pb);
-            return E_SUCCESS;
-
-        /**
-         * Configure a trigger. This is legal only if the current state is IDLE or ARMED (will re-arm).
-         *
-         * Payload:
-         *   u8 - source channel
-         *   u16 - triggering level
-         *   u8 - edge to trigger on: 1-rising, 2-falling, 3-both
-         *   u16 - pre-trigger samples count
-         *   u32 - post-trigger samples count
-         *   u16 - trigger hold-off in ms (dead time after firing, before it cna fire again if armed)
-         *   u8(bool) - auto re-arm after firing and completing the capture
-         */
-        case CMD_SETUP_TRIGGER:
-            adc_dbg("> Setup trigger");
-            if (priv->opmode != ADC_OPMODE_IDLE &&
-                priv->opmode != ADC_OPMODE_ARMED &&
-                priv->opmode != ADC_OPMODE_REARM_PENDING) {
-                return E_BUSY;
-            }
-
-            {
-                const uint8_t source = pp_u8(pp);
-                const uint16_t level = pp_u16(pp);
-                const uint8_t edge = pp_u8(pp);
-                const uint32_t pretrig = pp_u32(pp);
-                const uint32_t count = pp_u32(pp);
-                const uint16_t holdoff = pp_u16(pp);
-                const bool auto_rearm = pp_bool(pp);
-
-                if (source > UADC_MAX_CHANNEL) {
-                    com_respond_str(MSG_ERROR, frame_id, "Invalid trig source");
-                    return E_FAILURE;
-                }
-
-                if (0 == (priv->channels_mask & (1 << source))) {
-                    com_respond_str(MSG_ERROR, frame_id, "Channel not enabled");
-                    return E_FAILURE;
-                }
-
-                if (level > 4095) {
-                    com_respond_str(MSG_ERROR, frame_id, "Level out of range (0-4095)");
-                    return E_FAILURE;
-                }
-
-                if (edge == 0 || edge > 3) {
-                    com_respond_str(MSG_ERROR, frame_id, "Bad edge");
-                    return E_FAILURE;
-                }
-
-                // XXX the max size may be too much
-                const uint32_t max_pretrig = (priv->buf_itemcount / priv->nb_channels);
-                if (pretrig > max_pretrig) {
-                    com_respond_snprintf(frame_id, MSG_ERROR,
-                                         "Pretrig too large (max %d)", (int) max_pretrig);
-                    return E_FAILURE;
-                }
-
-                priv->trigger_source = source;
-                priv->trig_level = level;
-                priv->trig_prev_level = priv->last_samples[source];
-                priv->trig_edge = edge;
-                priv->pretrig_len = pretrig;
-                priv->trig_len = count;
-                priv->trig_holdoff = holdoff;
-                priv->auto_rearm = auto_rearm;
-            }
-            return E_SUCCESS;
-
-        /**
-         * Arm (permissible only if idle and the trigger is configured)
-         */
-        case CMD_ARM:
-            adc_dbg("> Arm");
-            uint8_t sticky = pp_u8(pp);
-
-            if(priv->opmode == ADC_OPMODE_ARMED || priv->opmode == ADC_OPMODE_REARM_PENDING) {
-                // We are armed or will re-arm promptly, act like the call succeeded
-                // The auto flag is set regardless
-            } else {
-                if (priv->opmode != ADC_OPMODE_IDLE) {
-                    return E_BUSY; // capture in progress
-                }
-
-                if (priv->trig_len == 0) {
-                    com_respond_str(MSG_ERROR, frame_id, "Trigger not configured.");
-                    return E_FAILURE;
-                }
-
-                UADC_SwitchMode(unit, ADC_OPMODE_ARMED);
-            }
-
-            if (sticky != 255) {
-                priv->auto_rearm = (bool)sticky;
-            }
-
-            return E_SUCCESS;
-
-        /**
-         * Dis-arm. Permissible only when idle or armed.
-         * Switches to idle.
-         */
-        case CMD_DISARM:
-            adc_dbg("> Disarm");
-
-            priv->auto_rearm = false;
-
-            if(priv->opmode == ADC_OPMODE_IDLE) {
-                return E_SUCCESS; // already idle, success - no work to do
-            }
-
-            // capture in progress
-            if (priv->opmode != ADC_OPMODE_ARMED &&
-                priv->opmode != ADC_OPMODE_REARM_PENDING) {
-                // Capture in progress, we already cleared auto rearm, so we're done for now
-                // auto_rearm is checked in the EOS isr and if cleared, does not re-arm.
-                return E_SUCCESS;
-            }
-
-            UADC_SwitchMode(unit, ADC_OPMODE_IDLE);
-            return E_SUCCESS;
-
-        /**
-         * Abort any ongoing capture and dis-arm.
-         */
-        case CMD_ABORT:;
-            adc_dbg("> Abort capture");
-            UADC_AbortCapture(unit);
-            return E_SUCCESS;
-
-        /**
-         * Force a trigger (complete with pre-trigger capture and hold-off)
-         * The reported edge will be 0b11, here meaning "manual trigger"
-         */
-        case CMD_FORCE_TRIGGER:
-            adc_dbg("> Force trigger");
-            // This is similar to block capture, but includes the pre-trig buffer and has fixed size based on trigger config
-            // FORCE is useful for checking if the trigger is set up correctly
-            if (priv->opmode != ADC_OPMODE_ARMED &&
-                priv->opmode != ADC_OPMODE_IDLE &&
-                priv->opmode != ADC_OPMODE_REARM_PENDING) return E_BUSY;
-
-            if (priv->trig_len == 0) {
-                com_respond_str(MSG_ERROR, frame_id, "Trigger not configured.");
-                return E_FAILURE;
-            }
-
-            UADC_HandleTrigger(unit, 0b11, PTIM_GetMicrotime());
-            return E_SUCCESS;
-
-        /**
-         * Start a block capture (like manual trigger, but without pre-trigger and arming)
-         *
-         * Payload:
-         *   u32 - sample count (for each channel)
-         */
-        case CMD_BLOCK_CAPTURE:
-            adc_dbg("> Block cpt");
-            if (priv->opmode != ADC_OPMODE_ARMED &&
-                priv->opmode != ADC_OPMODE_REARM_PENDING &&
-                priv->opmode != ADC_OPMODE_IDLE) return E_BUSY;
-
-            uint32_t count = pp_u32(pp);
-
-            UADC_StartBlockCapture(unit, count, frame_id);
-            return E_SUCCESS;
-
-        /**
-         * Start streaming (like block capture, but unlimited)
-         * The stream can be terminated by the stop command.
-         */
-        case CMD_STREAM_START:
-            adc_dbg("> Stream ON");
-            if (priv->opmode != ADC_OPMODE_ARMED &&
-                priv->opmode != ADC_OPMODE_REARM_PENDING &&
-                priv->opmode != ADC_OPMODE_IDLE) return E_BUSY;
-
-            UADC_StartStream(unit, frame_id);
-            return E_SUCCESS;
-
-        /**
-         * Stop a stream.
-         */
-        case CMD_STREAM_STOP:
-            adc_dbg("> Stream OFF");
-            if (priv->opmode != ADC_OPMODE_STREAM) {
-                com_respond_str(MSG_ERROR, frame_id, "Not streaming");
-                return E_FAILURE;
-            }
-
-            UADC_StopStream(unit);
-            return E_SUCCESS;
-
-        default:
-            return E_UNKNOWN_COMMAND;
-    }
-}
-
-// ------------------------------------------------------------------------
-
-/** Unit template */
-const UnitDriver UNIT_ADC = {
-    .name = "ADC",
-    .description = "Analog/digital converter",
-    // Settings
-    .preInit = UADC_preInit,
-    .cfgLoadBinary = UADC_loadBinary,
-    .cfgWriteBinary = UADC_writeBinary,
-    .cfgLoadIni = UADC_loadIni,
-    .cfgWriteIni = UADC_writeIni,
-    // Init
-    .init = UADC_init,
-    .deInit = UADC_deInit,
-    // Function
-    .handleRequest = UADC_handleRequest,
-    .updateTick = UADC_updateTick,
-};
--- a/units/adc/unit_adc.h
+++ b/units/adc/unit_adc.h
@ -1,15 +0,0 @@
-//
-// Created by MightyPork on 2017/11/25.
-//
-// ADC unit with several DSO-like features, like triggering, pre-trigger, block capture,
-// streaming, smoothing...
-//
-
-#ifndef U_TPL_H
-#define U_TPL_H
-
-#include "unit.h"
-
-extern const UnitDriver UNIT_ADC;
-
-#endif //U_TPL_H
--- a/units/digital_in/_din_api.c
+++ b/units/digital_in/_din_api.c
@ -1,71 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-#include "unit_din.h"
-
-#define DIN_INTERNAL
-
-#include "_din_internal.h"
-
-/** Read request */
-error_t UU_DIn_Read(Unit *unit, uint16_t *packed)
-{
-    CHECK_TYPE(unit, &UNIT_DIN);
-    struct priv *priv = unit->data;
-    *packed = pinmask_pack((uint16_t) priv->port->IDR, priv->pins);
-    return E_SUCCESS;
-}
-
-/** Arm pins */
-error_t UU_DIn_Arm(Unit *unit, uint16_t arm_single_packed, uint16_t arm_auto_packed)
-{
-    CHECK_TYPE(unit, &UNIT_DIN);
-    struct priv *priv = unit->data;
-
-    uint16_t arm_single = pinmask_spread(arm_single_packed, priv->pins);
-    uint16_t arm_auto = pinmask_spread(arm_auto_packed, priv->pins);
-
-    // abort if user tries to arm pin that doesn't have a trigger configured
-    if (0 != ((arm_single | arm_auto) & ~(priv->trig_fall | priv->trig_rise))) {
-        return E_BAD_VALUE;
-    }
-
-    // arm and reset hold-offs
-    // we use critical section to avoid irq between the two steps
-    vPortEnterCritical();
-    {
-        priv->arm_auto |= arm_single;
-        priv->arm_single |= arm_auto;
-        const uint16_t combined = arm_single | arm_auto;
-        for (int i = 0; i < 16; i++) {
-            if (combined & (1 << i)) {
-                priv->holdoff_countdowns[i] = 0;
-            }
-        }
-    }
-    vPortExitCritical();
-
-    return E_SUCCESS;
-}
-
-/** DisArm pins */
-error_t UU_DIn_DisArm(Unit *unit, uint16_t disarm_packed)
-{
-    CHECK_TYPE(unit, &UNIT_DIN);
-    struct priv *priv = unit->data;
-
-    uint16_t disarm = pinmask_spread(disarm_packed, priv->pins);
-
-    // abort if user tries to disarm pin that doesn't have a trigger configured
-    if (0 != ((disarm) & ~(priv->trig_fall | priv->trig_rise))) {
-        return E_BAD_VALUE;
-    }
-
-    priv->arm_auto &= ~disarm;
-    priv->arm_single &= ~disarm;
-
-    return E_SUCCESS;
-}
--- a/units/digital_in/_din_exti.c
+++ b/units/digital_in/_din_exti.c
@ -1,80 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-
-#define DIN_INTERNAL
-
-#include "_din_internal.h"
-
-/**
- * Send a trigger event to master (called on the message queue thread).
- *
- * unit - unit
- * timestamp - timestamp
- * data1 - packed, triggering pin
- * data2 - snapshot
- */
-static void DIn_SendTriggerReportToMaster(Job *job)
-{
-    PayloadBuilder pb = pb_start(unit_tmp512, UNIT_TMP_LEN, NULL);
-    pb_u16(&pb, (uint16_t) job->data1); // packed, 1 on the triggering pin
-    pb_u16(&pb, (uint16_t) job->data2); // packed, snapshot
-    assert_param(pb.ok);
-
-    EventReport event = {
-        .unit = job->unit,
-        .timestamp = job->timestamp,
-        .data = pb.start,
-        .length = (uint16_t) pb_length(&pb),
-    };
-
-    EventReport_Send(&event);
-}
-
-/**
- * EXTI callback for pin change interrupts
- *
- * @param arg - the unit is passed here
- */
-void DIn_handleExti(void *arg)
-{
-    const uint64_t ts = PTIM_GetMicrotime();
-
-    Unit *unit = arg;
-    struct priv *priv = unit->data;
-    const uint16_t snapshot = (uint16_t) priv->port->IDR;
-
-    uint16_t trigger_map = 0;
-
-    uint16_t mask = 1;
-    const uint16_t armed_pins = priv->arm_single | priv->arm_auto;
-    for (int i = 0; i < 16; i++, mask <<= 1) {
-        if (!LL_EXTI_ReadFlag_0_31(LL_EXTI_LINES[i])) continue;
-        LL_EXTI_ClearFlag_0_31(LL_EXTI_LINES[i]);
-
-        // Armed and ready
-        if ((armed_pins & mask) && (priv->holdoff_countdowns[i] == 0)) {
-            // Mark as captured
-            trigger_map |= (1 << i);
-            // Start hold-off (no-op if zero hold-off)
-            priv->holdoff_countdowns[i] = priv->trig_holdoff;
-        }
-    }
-
-    // Disarm all possibly used single triggers
-    priv->arm_single &= ~trigger_map;
-
-    if (trigger_map != 0) {
-        Job j = {
-            .unit = unit,
-            .timestamp = ts,
-            .data1 = pinmask_pack(trigger_map, priv->pins),
-            .data2 = pinmask_pack(snapshot, priv->pins),
-            .cb = DIn_SendTriggerReportToMaster
-        };
-        scheduleJob(&j);
-    }
-}
--- a/units/digital_in/_din_init.c
+++ b/units/digital_in/_din_init.c
@ -1,127 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-
-#define DIN_INTERNAL
-#include "_din_internal.h"
-
-/** Allocate data structure and set defaults */
-error_t DIn_preInit(Unit *unit)
-{
-    struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
-    if (priv == NULL) return E_OUT_OF_MEM;
-
-    // some defaults
-    priv->port_name = 'A';
-    priv->pins = 0x0001;
-    priv->pulldown = 0x0000;
-    priv->pullup = 0x0000;
-
-    priv->trig_rise = 0x0000;
-    priv->trig_fall = 0x0000;
-    priv->trig_holdoff = 100;
-    priv->def_auto = 0x0000;
-
-    return E_SUCCESS;
-}
-
-/** Finalize unit set-up */
-error_t DIn_init(Unit *unit)
-{
-    bool suc = true;
-    struct priv *priv = unit->data;
-
-    priv->pulldown &= priv->pins;
-    priv->pullup &= priv->pins;
-    priv->trig_rise &= priv->pins;
-    priv->trig_fall &= priv->pins;
-    priv->def_auto &= (priv->trig_rise|priv->trig_fall);
-
-    // copy auto-arm defaults to the auto-arm register (the register may be manipulated by commands)
-    priv->arm_auto = priv->def_auto;
-    priv->arm_single = 0;
-
-    // clear countdowns
-    memset(priv->holdoff_countdowns, 0, sizeof(priv->holdoff_countdowns));
-
-    // --- Parse config ---
-    priv->port = hw_port2periph(priv->port_name, &suc);
-    if (!suc) return E_BAD_CONFIG;
-
-    // Claim all needed pins
-    TRY(rsc_claim_gpios(unit, priv->port_name, priv->pins));
-
-    uint16_t mask = 1;
-    for (int i = 0; i < 16; i++, mask <<= 1) {
-        if (priv->pins & mask) {
-            uint32_t ll_pin = hw_pin2ll((uint8_t) i, &suc);
-
-            // --- Init hardware ---
-            LL_GPIO_SetPinMode(priv->port, ll_pin, LL_GPIO_MODE_INPUT);
-
-            uint32_t pull = 0;
-
-#if PLAT_NO_FLOATING_INPUTS
-            pull = LL_GPIO_PULL_UP;
-#else
-            pull = LL_GPIO_PULL_NO;
-#endif
-
-            if (priv->pulldown & mask) pull = LL_GPIO_PULL_DOWN;
-            if (priv->pullup & mask) pull = LL_GPIO_PULL_UP;
-            LL_GPIO_SetPinPull(priv->port, ll_pin, pull);
-
-            if ((priv->trig_rise|priv->trig_fall) & mask) {
-                LL_EXTI_EnableIT_0_31(LL_EXTI_LINES[i]);
-
-                if (priv->trig_rise & mask) {
-                    LL_EXTI_EnableRisingTrig_0_31(LL_EXTI_LINES[i]);
-                }
-                if (priv->trig_fall & mask) {
-                    LL_EXTI_EnableFallingTrig_0_31(LL_EXTI_LINES[i]);
-                }
-
-                LL_SYSCFG_SetEXTISource(LL_SYSCFG_EXTI_PORTS[priv->port_name-'A'], LL_SYSCFG_EXTI_LINES[i]);
-
-                irqd_attach(EXTIS[i], DIn_handleExti, unit);
-            }
-        }
-    }
-
-    // request ticks if we have triggers and any hold-offs configured
-    if ((priv->trig_rise|priv->trig_fall) && priv->trig_holdoff > 0) {
-        unit->tick_interval = 1;
-    }
-
-    return E_SUCCESS;
-}
-
-
-/** Tear down the unit */
-void DIn_deInit(Unit *unit)
-{
-    struct priv *priv = unit->data;
-
-    // pins are de-inited during teardown
-
-    // Detach EXTI handlers and disable interrupts
-    const uint16_t triggs = priv->trig_rise | priv->trig_fall;
-    if (unit->status == E_SUCCESS && triggs) {
-        uint16_t mask = 1;
-        for (int i = 0; i < 16; i++, mask <<= 1) {
-            if (triggs & mask) {
-                LL_EXTI_DisableIT_0_31(LL_EXTI_LINES[i]);
-                irqd_detach(EXTIS[i], DIn_handleExti);
-            }
-        }
-    }
-
-    // Release all resources
-    rsc_teardown(unit);
-
-    // Free memory
-    free_ck(unit->data);
-}
--- a/units/digital_in/_din_internal.h
+++ b/units/digital_in/_din_internal.h
@ -1,65 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#ifndef GEX_F072_DIN_INTERNAL_H
-#define GEX_F072_DIN_INTERNAL_H
-
-#ifndef DIN_INTERNAL
-#error bad include!
-#endif
-
-#include "unit_base.h"
-
-/** Private data structure */
-struct priv {
-    char port_name;
-    uint16_t pins; // pin mask
-    uint16_t pulldown; // pull-downs (default is pull-up)
-    uint16_t pullup; // pull-ups
-    uint16_t trig_rise; // pins generating events on rising edge
-    uint16_t trig_fall; // pins generating events on falling edge
-    uint16_t trig_holdoff; // ms
-    uint16_t def_auto; // initial auto triggers
-
-    uint16_t arm_auto;   // pins armed for auto reporting
-    uint16_t arm_single; // pins armed for single event
-    uint16_t holdoff_countdowns[16]; // countdowns to arm for each pin in the bit map
-    GPIO_TypeDef *port;
-};
-
-/** Allocate data structure and set defaults */
-error_t DIn_preInit(Unit *unit);
-
-/** Load from a binary buffer stored in Flash */
-void DIn_loadBinary(Unit *unit, PayloadParser *pp);
-
-/** Write to a binary buffer for storing in Flash */
-void DIn_writeBinary(Unit *unit, PayloadBuilder *pb);
-
-// ------------------------------------------------------------------------
-
-/** Parse a key-value pair from the INI file */
-error_t DIn_loadIni(Unit *unit, const char *key, const char *value);
-
-/** Generate INI file section for the unit */
-void DIn_writeIni(Unit *unit, IniWriter *iw);
-
-// ------------------------------------------------------------------------
-
-/** Finalize unit set-up */
-error_t DIn_init(Unit *unit);
-
-/** Tear down the unit */
-void DIn_deInit(Unit *unit);
-
-// ------------------------------------------------------------------------
-
-/**
- * EXTI callback for pin change interrupts
- *
- * @param arg - the unit is passed here
- */
-void DIn_handleExti(void *arg);
-
-#endif //GEX_F072_DIN_INTERNAL_H
--- a/units/digital_in/_din_settings.c
+++ b/units/digital_in/_din_settings.c
@ -1,118 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-
-#define DIN_INTERNAL
-#include "_din_internal.h"
-
-/** Load from a binary buffer stored in Flash */
-void DIn_loadBinary(Unit *unit, PayloadParser *pp)
-{
-    struct priv *priv = unit->data;
-
-    uint8_t version = pp_u8(pp);
-    (void)version;
-
-    priv->port_name = pp_char(pp);
-    priv->pins = pp_u16(pp);
-    priv->pulldown = pp_u16(pp);
-    priv->pullup = pp_u16(pp);
-    priv->trig_rise = pp_u16(pp);
-    priv->trig_fall = pp_u16(pp);
-    priv->trig_holdoff = pp_u16(pp);
-    priv->def_auto = pp_u16(pp);
-}
-
-/** Write to a binary buffer for storing in Flash */
-void DIn_writeBinary(Unit *unit, PayloadBuilder *pb)
-{
-    struct priv *priv = unit->data;
-
-    pb_u8(pb, 0); // version
-
-    pb_char(pb, priv->port_name);
-    pb_u16(pb, priv->pins);
-    pb_u16(pb, priv->pulldown);
-    pb_u16(pb, priv->pullup);
-    pb_u16(pb, priv->trig_rise);
-    pb_u16(pb, priv->trig_fall);
-    pb_u16(pb, priv->trig_holdoff);
-    pb_u16(pb, priv->def_auto);
-}
-
-// ------------------------------------------------------------------------
-
-/** Parse a key-value pair from the INI file */
-error_t DIn_loadIni(Unit *unit, const char *key, const char *value)
-{
-    bool suc = true;
-    struct priv *priv = unit->data;
-
-    if (streq(key, "port")) {
-        suc = cfg_port_parse(value, &priv->port_name);
-    }
-    else if (streq(key, "pins")) {
-        priv->pins = cfg_pinmask_parse(value, &suc);
-    }
-    else if (streq(key, "pull-up")) {
-        priv->pullup = cfg_pinmask_parse(value, &suc);
-    }
-    else if (streq(key, "pull-down")) {
-        priv->pulldown = cfg_pinmask_parse(value, &suc);
-    }
-    else if (streq(key, "trig-rise")) {
-        priv->trig_rise = cfg_pinmask_parse(value, &suc);
-    }
-    else if (streq(key, "trig-fall")) {
-        priv->trig_fall = cfg_pinmask_parse(value, &suc);
-    }
-    else if (streq(key, "auto-trigger")) {
-        priv->def_auto = cfg_pinmask_parse(value, &suc);
-    }
-    else if (streq(key, "hold-off")) {
-        priv->trig_holdoff = cfg_u16_parse(value, &suc);
-    }
-    else {
-        return E_BAD_KEY;
-    }
-
-    if (!suc) return E_BAD_VALUE;
-    return E_SUCCESS;
-}
-
-/** Generate INI file section for the unit */
-void DIn_writeIni(Unit *unit, IniWriter *iw)
-{
-    struct priv *priv = unit->data;
-
-    iw_comment(iw, "Port name");
-    iw_entry(iw, "port", "%c", priv->port_name);
-
-    iw_comment(iw, "Pins (comma separated, supports ranges)");
-    iw_entry_s(iw, "pins", cfg_pinmask_encode(priv->pins, unit_tmp512, 0));
-
-    iw_comment(iw, "Pins with pull-up");
-    iw_entry_s(iw, "pull-up", cfg_pinmask_encode(priv->pullup, unit_tmp512, 0));
-
-    iw_comment(iw, "Pins with pull-down");
-    iw_entry_s(iw, "pull-down", cfg_pinmask_encode(priv->pulldown, unit_tmp512, 0));
-
-    iw_cmt_newline(iw);
-    iw_comment(iw, "Trigger pins activated by rising/falling edge");
-    iw_entry_s(iw, "trig-rise", cfg_pinmask_encode(priv->trig_rise, unit_tmp512, 0));
-    iw_entry_s(iw, "trig-fall", cfg_pinmask_encode(priv->trig_fall, unit_tmp512, 0));
-
-    iw_comment(iw, "Trigger pins auto-armed by default");
-    iw_entry_s(iw, "auto-trigger", cfg_pinmask_encode(priv->def_auto, unit_tmp512, 0));
-
-    iw_comment(iw, "Triggers hold-off time (ms)");
-    iw_entry_d(iw, "hold-off", priv->trig_holdoff);
-
-#if PLAT_NO_FLOATING_INPUTS
-    iw_comment(iw, "NOTE: Pins use pull-up by default.\r\n");
-#endif
-}
-
--- a/units/digital_in/unit_din.c
+++ b/units/digital_in/unit_din.c
@ -1,94 +0,0 @@
-//
-// Created by MightyPork on 2017/11/25.
-//
-
-#include "unit_base.h"
-#include "unit_din.h"
-
-#define DIN_INTERNAL
-#include "_din_internal.h"
-
-// ------------------------------------------------------------------------
-
-enum PinCmd_ {
-    CMD_READ = 0,
-    CMD_ARM_SINGLE = 1,
-    CMD_ARM_AUTO = 2,
-    CMD_DISARM = 3,
-};
-
-/** Handle a request message */
-static error_t DIn_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
-{
-    uint16_t pins = 0;
-
-    switch (command) {
-        case CMD_READ:;
-            TRY(UU_DIn_Read(unit, &pins));
-
-            PayloadBuilder pb = pb_start((uint8_t*)unit_tmp512, UNIT_TMP_LEN, NULL);
-            pb_u16(&pb, pins); // packed input pins
-            com_respond_buf(frame_id, MSG_SUCCESS, (uint8_t *) unit_tmp512, pb_length(&pb));
-            return E_SUCCESS;
-
-        case CMD_ARM_SINGLE:;
-            pins = pp_u16(pp);
-            if (!pp->ok) return E_MALFORMED_COMMAND;
-
-            TRY(UU_DIn_Arm(unit, pins, 0));
-            return E_SUCCESS;
-
-        case CMD_ARM_AUTO:;
-            pins = pp_u16(pp);
-            if (!pp->ok) return E_MALFORMED_COMMAND;
-
-            TRY(UU_DIn_Arm(unit, 0, pins));
-            return E_SUCCESS;
-
-        case CMD_DISARM:;
-            pins = pp_u16(pp);
-            if (!pp->ok) return E_MALFORMED_COMMAND;
-
-            TRY(UU_DIn_DisArm(unit, pins));
-            return E_SUCCESS;
-
-        default:
-            return E_UNKNOWN_COMMAND;
-    }
-}
-
-/**
- * Decrement all the hold-off timers on tick
- *
- * @param unit
- */
-static void DIn_updateTick(Unit *unit)
-{
-    struct priv *priv = unit->data;
-
-    for (int i = 0; i < 16; i++) {
-        if (priv->holdoff_countdowns[i] > 0) {
-            priv->holdoff_countdowns[i]--;
-        }
-    }
-}
-
-// ------------------------------------------------------------------------
-
-/** Unit template */
-const UnitDriver UNIT_DIN = {
-    .name = "DI",
-    .description = "Digital input with triggers",
-    // Settings
-    .preInit = DIn_preInit,
-    .cfgLoadBinary = DIn_loadBinary,
-    .cfgWriteBinary = DIn_writeBinary,
-    .cfgLoadIni = DIn_loadIni,
-    .cfgWriteIni = DIn_writeIni,
-    // Init
-    .init = DIn_init,
-    .deInit = DIn_deInit,
-    // Function
-    .handleRequest = DIn_handleRequest,
-    .updateTick = DIn_updateTick,
-};
--- a/units/digital_in/unit_din.h
+++ b/units/digital_in/unit_din.h
@ -1,42 +0,0 @@
-//
-// Created by MightyPork on 2017/11/25.
-//
-// Digital input unit; single or multiple pin read access on one port (A-F)
-//
-
-#ifndef U_DIN_H
-#define U_DIN_H
-
-#include "unit.h"
-
-extern const UnitDriver UNIT_DIN;
-
-/**
- * Read pins
- *
- * @param unit - unit instance
- * @param packed - output; the packed (right aligned) bits representing the pins, highest to lowest, are written here.
- * @return success
- */
-error_t UU_DIn_Read(Unit *unit, uint16_t *packed);
-
-/**
- * Arm pins for trigger generation
- *
- * @param unit - unit instance
- * @param arm_single_packed - packed bit map of pins to arm for single trigger
- * @param arm_auto_packed - packed bit map of pins to arm for auto trigger (repeated)
- * @return success
- */
-error_t UU_DIn_Arm(Unit *unit, uint16_t arm_single_packed, uint16_t arm_auto_packed);
-
-/**
- * Dis-arm pins to not generate events
- *
- * @param unit - unit instance
- * @param disarm_packed - packed bit map of pins to dis-arm
- * @return success
- */
-error_t UU_DIn_DisArm(Unit *unit, uint16_t disarm_packed);
-
-#endif //U_DIN_H
--- a/units/digital_out/_dout_api.c
+++ b/units/digital_out/_dout_api.c
@ -1,73 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-#include "unit_dout.h"
-
-#define DOUT_INTERNAL
-#include "_dout_internal.h"
-
-error_t UU_DOut_Write(Unit *unit, uint16_t packed)
-{
-    CHECK_TYPE(unit, &UNIT_DOUT);
-
-    struct priv *priv = unit->data;
-    uint16_t mask = priv->pins;
-    uint16_t spread = pinmask_spread(packed, mask);
-
-    uint16_t set = spread;
-    uint16_t reset = ((~spread) & mask);
-    priv->port->BSRR = set | (reset << 16);
-    return E_SUCCESS;
-}
-
-error_t UU_DOut_Set(Unit *unit, uint16_t packed)
-{
-    CHECK_TYPE(unit, &UNIT_DOUT);
-
-    struct priv *priv = unit->data;
-    uint16_t mask = priv->pins;
-    uint16_t spread = pinmask_spread(packed, mask);
-
-    priv->port->BSRR = spread;
-    return E_SUCCESS;
-}
-
-error_t UU_DOut_Clear(Unit *unit, uint16_t packed)
-{
-    CHECK_TYPE(unit, &UNIT_DOUT);
-
-    struct priv *priv = unit->data;
-    uint16_t mask = priv->pins;
-    uint16_t spread = pinmask_spread(packed, mask);
-
-    priv->port->BSRR = (spread<<16);
-    return E_SUCCESS;
-}
-
-error_t UU_DOut_Toggle(Unit *unit, uint16_t packed)
-{
-    CHECK_TYPE(unit, &UNIT_DOUT);
-
-    struct priv *priv = unit->data;
-    uint16_t mask = priv->pins;
-    uint16_t spread = pinmask_spread(packed, mask);
-
-    uint16_t flipped = (uint16_t) (~priv->port->ODR) & mask;
-    uint16_t set = flipped & spread;
-    uint16_t reset = ((~flipped) & mask) & spread;
-    priv->port->BSRR = set | (reset<<16);
-    return E_SUCCESS;
-}
-
-error_t UU_DOut_GetPinCount(Unit *unit, uint8_t *count)
-{
-    CHECK_TYPE(unit, &UNIT_DOUT);
-    struct priv *priv = unit->data;
-
-    uint32_t packed = pinmask_pack(0xFFFF, priv->pins);
-    *count = (uint8_t)(32 - __CLZ(packed));
-    return E_SUCCESS;
-}
--- a/units/digital_out/_dout_init.c
+++ b/units/digital_out/_dout_init.c
@ -1,71 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-
-#define DOUT_INTERNAL
-#include "_dout_internal.h"
-
-/** Allocate data structure and set defaults */
-error_t DOut_preInit(Unit *unit)
-{
-    struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
-    if (priv == NULL) return E_OUT_OF_MEM;
-
-    // some defaults
-    priv->port_name = 'A';
-    priv->pins = 0x0001;
-    priv->open_drain = 0x0000;
-    priv->initial = 0x0000;
-
-    return E_SUCCESS;
-}
-
-/** Finalize unit set-up */
-error_t DOut_init(Unit *unit)
-{
-    bool suc = true;
-    struct priv *priv = unit->data;
-
-    priv->initial &= priv->pins;
-    priv->open_drain &= priv->pins;
-
-    // --- Parse config ---
-    priv->port = hw_port2periph(priv->port_name, &suc);
-    if (!suc) return E_BAD_CONFIG;
-
-    // Claim all needed pins
-    TRY(rsc_claim_gpios(unit, priv->port_name, priv->pins));
-
-    for (int i = 0; i < 16; i++) {
-        if (priv->pins & (1 << i)) {
-            uint32_t ll_pin = hw_pin2ll((uint8_t) i, &suc);
-
-            // --- Init hardware ---
-            LL_GPIO_SetPinMode(priv->port, ll_pin, LL_GPIO_MODE_OUTPUT);
-            LL_GPIO_SetPinOutputType(priv->port, ll_pin,
-                                     (priv->open_drain & (1 << i)) ? LL_GPIO_OUTPUT_OPENDRAIN : LL_GPIO_OUTPUT_PUSHPULL);
-            LL_GPIO_SetPinSpeed(priv->port, ll_pin, LL_GPIO_SPEED_FREQ_HIGH);
-        }
-    }
-
-    // Set the initial state
-    priv->port->ODR &= ~priv->pins;
-    priv->port->ODR |= priv->initial;
-
-    return E_SUCCESS;
-}
-
-/** Tear down the unit */
-void DOut_deInit(Unit *unit)
-{
-    // pins are de-inited during teardown
-
-    // Release all resources
-    rsc_teardown(unit);
-
-    // Free memory
-    free_ck(unit->data);
-}
--- a/units/digital_out/_dout_internal.h
+++ b/units/digital_out/_dout_internal.h
@ -1,49 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#ifndef GEX_F072_DOUT_INTERNAL_H
-#define GEX_F072_DOUT_INTERNAL_H
-
-#ifndef DOUT_INTERNAL
-#error bad include!
-#endif
-
-#include "unit_base.h"
-
-/** Private data structure */
-struct priv {
-    char port_name;
-    uint16_t pins; // pin mask
-    uint16_t initial; // initial pin states
-    uint16_t open_drain; // open drain pins
-
-    GPIO_TypeDef *port;
-};
-
-/** Allocate data structure and set defaults */
-error_t DOut_preInit(Unit *unit);
-
-/** Load from a binary buffer stored in Flash */
-void DOut_loadBinary(Unit *unit, PayloadParser *pp);
-
-/** Write to a binary buffer for storing in Flash */
-void DOut_writeBinary(Unit *unit, PayloadBuilder *pb);
-
-// ------------------------------------------------------------------------
-
-/** Parse a key-value pair from the INI file */
-error_t DOut_loadIni(Unit *unit, const char *key, const char *value);
-
-/** Generate INI file section for the unit */
-void DOut_writeIni(Unit *unit, IniWriter *iw);
-
-// ------------------------------------------------------------------------
-
-/** Finalize unit set-up */
-error_t DOut_init(Unit *unit);
-
-/** Tear down the unit */
-void DOut_deInit(Unit *unit);
-
-#endif //GEX_F072_DOUT_INTERNAL_H
--- a/units/digital_out/_dout_settings.c
+++ b/units/digital_out/_dout_settings.c
@ -1,82 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-
-#define DOUT_INTERNAL
-#include "_dout_internal.h"
-
-/** Load from a binary buffer stored in Flash */
-void DOut_loadBinary(Unit *unit, PayloadParser *pp)
-{
-    struct priv *priv = unit->data;
-
-    uint8_t version = pp_u8(pp);
-    (void)version;
-
-    priv->port_name = pp_char(pp);
-    priv->pins = pp_u16(pp);
-    priv->initial = pp_u16(pp);
-    priv->open_drain = pp_u16(pp);
-}
-
-/** Write to a binary buffer for storing in Flash */
-void DOut_writeBinary(Unit *unit, PayloadBuilder *pb)
-{
-    struct priv *priv = unit->data;
-
-    pb_u8(pb, 0); // version
-
-    pb_char(pb, priv->port_name);
-    pb_u16(pb, priv->pins);
-    pb_u16(pb, priv->initial);
-    pb_u16(pb, priv->open_drain);
-}
-
-// ------------------------------------------------------------------------
-
-/** Parse a key-value pair from the INI file */
-error_t DOut_loadIni(Unit *unit, const char *key, const char *value)
-{
-    bool suc = true;
-    struct priv *priv = unit->data;
-
-    if (streq(key, "port")) {
-        suc = cfg_port_parse(value, &priv->port_name);
-    }
-    else if (streq(key, "pins")) {
-        priv->pins = cfg_pinmask_parse(value, &suc);
-    }
-    else if (streq(key, "initial")) {
-        priv->initial = cfg_pinmask_parse(value, &suc);
-    }
-    else if (streq(key, "open-drain")) {
-        priv->open_drain = cfg_pinmask_parse(value, &suc);
-    }
-    else {
-        return E_BAD_KEY;
-    }
-
-    if (!suc) return E_BAD_VALUE;
-    return E_SUCCESS;
-}
-
-/** Generate INI file section for the unit */
-void DOut_writeIni(Unit *unit, IniWriter *iw)
-{
-    struct priv *priv = unit->data;
-
-    iw_comment(iw, "Port name");
-    iw_entry(iw, "port", "%c", priv->port_name);
-
-    iw_comment(iw, "Pins (comma separated, supports ranges)");
-    iw_entry_s(iw, "pins", cfg_pinmask_encode(priv->pins, unit_tmp512, 0));
-
-    iw_comment(iw, "Initially high pins");
-    iw_entry_s(iw, "initial", cfg_pinmask_encode(priv->initial, unit_tmp512, 0));
-
-    iw_comment(iw, "Open-drain pins");
-    iw_entry_s(iw, "open-drain", cfg_pinmask_encode(priv->open_drain, unit_tmp512, 0));
-}
--- a/units/digital_out/unit_dout.c
+++ b/units/digital_out/unit_dout.c
@ -1,58 +0,0 @@
-//
-// Created by MightyPork on 2017/11/25.
-//
-
-#include "unit_base.h"
-#include "unit_dout.h"
-
-#define DOUT_INTERNAL
-#include "_dout_internal.h"
-
-enum PinCmd_ {
-    CMD_TEST = 0,
-    CMD_SET = 1,
-    CMD_CLEAR = 2,
-    CMD_TOGGLE = 3,
-};
-
-/** Handle a request message */
-static error_t DOut_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
-{
-    uint16_t packed = pp_u16(pp);
-
-    switch (command) {
-        case CMD_TEST:
-            return UU_DOut_Write(unit, packed);
-
-        case CMD_SET:
-            return UU_DOut_Set(unit, packed);
-
-        case CMD_CLEAR:
-            return UU_DOut_Clear(unit, packed);
-
-        case CMD_TOGGLE:
-            return UU_DOut_Toggle(unit, packed);
-
-        default:
-            return E_UNKNOWN_COMMAND;
-    }
-}
-
-// ------------------------------------------------------------------------
-
-/** Unit template */
-const UnitDriver UNIT_DOUT = {
-    .name = "DO",
-    .description = "Digital output",
-    // Settings
-    .preInit = DOut_preInit,
-    .cfgLoadBinary = DOut_loadBinary,
-    .cfgWriteBinary = DOut_writeBinary,
-    .cfgLoadIni = DOut_loadIni,
-    .cfgWriteIni = DOut_writeIni,
-    // Init
-    .init = DOut_init,
-    .deInit = DOut_deInit,
-    // Function
-    .handleRequest = DOut_handleRequest,
-};
--- a/units/digital_out/unit_dout.h
+++ b/units/digital_out/unit_dout.h
@ -1,59 +0,0 @@
-//
-// Created by MightyPork on 2017/11/25.
-//
-// Digital output unit; single or multiple pin write access on one port (A-F)
-//
-
-#ifndef U_DOUT_H
-#define U_DOUT_H
-
-#include "unit.h"
-
-extern const UnitDriver UNIT_DOUT;
-
-/**
- * Write pins (e.g. writing 0b10 if configured pins are PA5 and PA0 sets PA5=1,PA0=0)
- *
- * @param unit
- * @param packed - packed pin states (aligned to right)
- * @return success
- */
-error_t UU_DOut_Write(Unit *unit, uint16_t packed);
-
-/**
- * Set pins (clear none)
- *
- * @param unit
- * @param packed - packed pins, 1 if pin should be set
- * @return success
- */
-error_t UU_DOut_Set(Unit *unit, uint16_t packed);
-
-/**
- * Clear multiple pins
- *
- * @param unit
- * @param packed - packed pins, 1 if pin should be cleared
- * @return
- */
-error_t UU_DOut_Clear(Unit *unit, uint16_t packed);
-
-/**
- * Toggle pins
- *
- * @param unit
- * @param packed - packed pins, 1 if pin should be toggled
- * @return
- */
-error_t UU_DOut_Toggle(Unit *unit, uint16_t packed);
-
-/**
- * Get number of configured pins
- *
- * @param unit
- * @param count output, written with 0-16
- * @return success
- */
-error_t UU_DOut_GetPinCount(Unit *unit, uint8_t *count);
-
-#endif //U_DOUT_H
--- a/units/fcap/_fcap_api.c
+++ b/units/fcap/_fcap_api.c
@ -1,11 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-#include "unit_fcap.h"
-
-#define FCAP_INTERNAL
-#include "_fcap_internal.h"
-
--- a/units/fcap/_fcap_core.c
+++ b/units/fcap/_fcap_core.c
@ -1,462 +0,0 @@
-//
-// Created by MightyPork on 2018/02/20.
-//
-
-#include <stm32f072xb.h>
-#include "platform.h"
-
-#define FCAP_INTERNAL
-#include "_fcap_internal.h"
-
-static void UFCAP_StopMeasurement(Unit *unit);
-static void UFCAP_ConfigureForIndirectCapture(Unit *unit);
-static void UFCAP_ConfigureForDirectCapture(Unit *unit, uint16_t msec);
-static void UFCAP_ConfigureForFreeCapture(Unit *unit);
-
-uint32_t UFCAP_GetFreeCounterValue(Unit *unit)
-{
-    struct priv * const priv = unit->data;
-    TIM_TypeDef * const TIMx = priv->TIMx;
-    return TIMx->CNT;
-}
-
-uint32_t UFCAP_FreeCounterClear(Unit *unit)
-{
-    struct priv * const priv = unit->data;
-    TIM_TypeDef * const TIMx = priv->TIMx;
-
-    // this isn't perfect, we can miss one clock
-    // but it's probably the best we can do here ...
-    vPortEnterCritical();
-    uint32_t val = TIMx->CNT;
-    TIMx->CNT = 0;
-    vPortExitCritical();
-
-    return val;
-}
-
-static void UFCAP_IndirectBurstReportJob(Job *job)
-{
-    Unit *unit = job->unit;
-    struct priv * const priv = unit->data;
-
-    uint8_t buf[20];
-    PayloadBuilder pb = pb_start(buf, 20, NULL);
-
-    pb_u16(&pb, PLAT_AHB_MHZ);
-    pb_u16(&pb, priv->ind_burst.n_count);
-    pb_u64(&pb, priv->ind_burst.period_acu);
-    pb_u64(&pb, priv->ind_burst.ontime_acu);
-
-    assert_param(pb.ok);
-
-    com_respond_pb(priv->request_id, MSG_SUCCESS, &pb);
-
-    // timer is already stopped, now in OPMODE_BUSY
-    priv->opmode = OPMODE_IDLE;
-}
-
-static void UFCAP_SinglePulseReportJob(Job *job)
-{
-    Unit *unit = job->unit;
-    struct priv * const priv = unit->data;
-
-    uint8_t buf[6];
-    PayloadBuilder pb = pb_start(buf, 6, NULL);
-
-    pb_u16(&pb, PLAT_AHB_MHZ);
-    pb_u32(&pb, job->data1);
-    assert_param(pb.ok);
-
-    com_respond_pb(priv->request_id, MSG_SUCCESS, &pb);
-
-    // timer is already stopped, now in OPMODE_BUSY
-    priv->opmode = OPMODE_IDLE;
-}
-
-/**
- * Count is passed in data1
- * @param job
- */
-static void UFCAP_DirectBurstReportJob(Job *job)
-{
-    Unit *unit = job->unit;
-    struct priv * const priv = unit->data;
-
-    uint8_t buf[8];
-    PayloadBuilder pb = pb_start(buf, 8, NULL);
-
-    pb_u8(&pb, priv->direct_presc);
-    pb_u16(&pb, priv->dir_burst.msec);
-    pb_u32(&pb, job->data1);
-
-    assert_param(pb.ok);
-
-    com_respond_pb(priv->request_id, MSG_SUCCESS, &pb);
-
-    // timer is already stopped, now in OPMODE_BUSY
-    priv->opmode = OPMODE_IDLE;
-}
-
-void UFCAP_TIMxHandler(void *arg)
-{
-    Unit *unit = arg;
-    assert_param(unit);
-    struct priv * const priv = unit->data;
-    assert_param(priv);
-
-    TIM_TypeDef * const TIMx = priv->TIMx;
-
-    if (priv->opmode == OPMODE_INDIRECT_CONT) {
-        if (LL_TIM_IsActiveFlag_CC1(TIMx)) {
-            if (priv->n_skip > 0) {
-                priv->n_skip--;
-            } else {
-                priv->ind_cont.last_period = LL_TIM_IC_GetCaptureCH1(TIMx);
-                priv->ind_cont.last_ontime = priv->ind_cont.ontime;
-            }
-            LL_TIM_ClearFlag_CC1(TIMx);
-            LL_TIM_ClearFlag_CC1OVR(TIMx);
-        }
-
-        if (LL_TIM_IsActiveFlag_CC2(TIMx)) {
-            priv->ind_cont.ontime = LL_TIM_IC_GetCaptureCH2(TIMx);
-            LL_TIM_ClearFlag_CC2(TIMx);
-            LL_TIM_ClearFlag_CC2OVR(TIMx);
-        }
-    }
-    else if (priv->opmode == OPMODE_SINGLE_PULSE) {
-        if (LL_TIM_IsActiveFlag_CC2(TIMx)) {
-            // single pulse - does not wait for the second edge
-            uint32_t len = LL_TIM_IC_GetCaptureCH2(TIMx);
-
-            priv->opmode = OPMODE_BUSY;
-            UFCAP_StopMeasurement(unit);
-
-            Job j = {
-                .cb = UFCAP_SinglePulseReportJob,
-                .unit = unit,
-                .data1 = len,
-            };
-            scheduleJob(&j);
-        }
-    }
-    else if (priv->opmode == OPMODE_INDIRECT_BURST) {
-        if (LL_TIM_IsActiveFlag_CC1(TIMx)) {
-            const uint32_t period = LL_TIM_IC_GetCaptureCH1(TIMx);
-            const uint32_t ontime = priv->ind_burst.ontime;
-
-            if (priv->n_skip > 0) {
-                priv->n_skip--;
-            } else {
-                priv->ind_burst.ontime_acu += ontime;
-                priv->ind_burst.period_acu += period;
-                if (++priv->ind_burst.n_count == priv->ind_burst.n_target) {
-                    priv->opmode = OPMODE_BUSY;
-                    UFCAP_StopMeasurement(unit);
-
-                    Job j = {
-                        .cb = UFCAP_IndirectBurstReportJob,
-                        .unit = unit,
-                    };
-                    scheduleJob(&j);
-                }
-            }
-
-            LL_TIM_ClearFlag_CC1(TIMx);
-            LL_TIM_ClearFlag_CC1OVR(TIMx);
-        }
-
-        if (LL_TIM_IsActiveFlag_CC2(TIMx)) {
-            priv->ind_burst.ontime = LL_TIM_IC_GetCaptureCH2(TIMx);
-            LL_TIM_ClearFlag_CC2(TIMx);
-            LL_TIM_ClearFlag_CC2OVR(TIMx);
-        }
-    }
-    else if (priv->opmode == OPMODE_IDLE) {
-        // clear everything - in idle it would cycle in the handler forever
-        TIMx->SR = 0;
-    }
-    else {
-        trap("Unhandled fcap TIMx irq");
-    }
-}
-
-void UFCAP_TIMyHandler(void *arg)
-{
-    Unit *unit = arg;
-    assert_param(unit);
-    struct priv *const priv = unit->data;
-    assert_param(priv);
-
-    TIM_TypeDef * const TIMx = priv->TIMx;
-    TIM_TypeDef * const TIMy = priv->TIMy;
-    uint32_t cnt = TIMx->CNT; // TIMx should be stopped now
-
-//    dbg("> TIMy Handler, TIMx cntr is %d", cnt);
-    priv->dir_cont.last_count = cnt;
-
-    if (priv->opmode == OPMODE_DIRECT_CONT) {
-        LL_TIM_DisableCounter(TIMx);
-        LL_TIM_DisableCounter(TIMy);
-        LL_TIM_SetCounter(TIMx, 0);
-        LL_TIM_SetCounter(TIMy, 0);
-        LL_TIM_EnableCounter(TIMy); // next loop
-        LL_TIM_EnableCounter(TIMx);
-    }
-    else if (priv->opmode == OPMODE_DIRECT_BURST) {
-        priv->opmode = OPMODE_BUSY;
-        UFCAP_StopMeasurement(unit);
-
-        Job j = {
-            .cb = UFCAP_DirectBurstReportJob,
-            .unit = unit,
-            .data1 = cnt,
-        };
-        scheduleJob(&j);
-    }
-    else if (priv->opmode == OPMODE_IDLE) {
-        // clear everything - in idle it would cycle in the handler forever
-        TIMy->SR = 0;
-    }
-    else {
-        trap("Unhandled fcap TIMy irq");
-    }
-
-    LL_TIM_ClearFlag_UPDATE(TIMy);
-}
-
-static void UFCAP_ClearTimerConfig(Unit *unit)
-{
-    struct priv * const priv = unit->data;
-    TIM_TypeDef * const TIMx = priv->TIMx;
-
-    // CLEAR CURRENT STATE, STOP
-    UFCAP_StopMeasurement(unit);
-
-    // CONFIGURE TIMER BASIC PARAMS
-    LL_TIM_SetPrescaler(TIMx, 0);
-    LL_TIM_SetAutoReload(TIMx, 0xFFFFFFFF);
-    LL_TIM_EnableARRPreload(TIMx);
-    LL_TIM_GenerateEvent_UPDATE(TIMx);
-}
-
-/**
- * Reset all timer registers
- *
- * @param unit
- */
-static void UFCAP_StopMeasurement(Unit *unit)
-{
-    struct priv * const priv = unit->data;
-
-    LL_TIM_DeInit(priv->TIMx); // clear all flags and settings
-    LL_TIM_DeInit(priv->TIMy); // clear all flags and settings
-}
-
-/**
- * Switch the FCAP module opmode
- *
- * @param unit
- * @param opmode
- */
-void UFCAP_SwitchMode(Unit *unit, enum fcap_opmode opmode)
-{
-    struct priv * const priv = unit->data;
-
-    if (opmode == priv->opmode) return;
-
-    priv->opmode = opmode;
-
-    switch (opmode) {
-        case OPMODE_IDLE:
-            // XXX maybe we should report the abort to the PC-side listener
-            UFCAP_StopMeasurement(unit);
-            break;
-
-        case OPMODE_INDIRECT_CONT:
-            priv->ind_cont.last_ontime = 0;
-            priv->ind_cont.last_period = 0;
-            priv->ind_cont.ontime = 0;
-            priv->n_skip = 1; // discard the first cycle (will be incomplete)
-            UFCAP_ConfigureForIndirectCapture(unit); // is also stopped and restarted
-            break;
-
-        case OPMODE_INDIRECT_BURST:
-            priv->ind_burst.ontime = 0;
-            priv->ind_burst.n_count = 0;
-            priv->ind_burst.period_acu = 0;
-            priv->ind_burst.ontime_acu = 0;
-            priv->n_skip = 1; // discard the first cycle (will be incomplete)
-            UFCAP_ConfigureForIndirectCapture(unit); // is also stopped and restarted
-            break;
-
-        case OPMODE_SINGLE_PULSE:
-            priv->n_skip = 0;
-            UFCAP_ConfigureForIndirectCapture(unit); // is also stopped and restarted
-            break;
-
-        case OPMODE_DIRECT_CONT:
-            // msec is set by caller
-            priv->dir_cont.last_count = 0;
-            priv->n_skip = 1; // discard the first cycle (will be incomplete)
-            UFCAP_ConfigureForDirectCapture(unit, priv->direct_msec);
-            break;
-
-        case OPMODE_DIRECT_BURST:
-            // msec is set by caller
-            priv->n_skip = 0; // no skip here (if there was any)
-            UFCAP_ConfigureForDirectCapture(unit, (uint16_t) priv->dir_burst.msec);
-            break;
-
-        case OPMODE_FREE_COUNTER:
-            UFCAP_ConfigureForFreeCapture(unit);
-            break;
-
-        default:
-            trap("Unhandled opmode %d", (int)opmode);
-    }
-}
-
-/**
- * Configure peripherals for an indirect capture (PWM measurement) - continuous or burst
- * @param unit
- */
-static void UFCAP_ConfigureForIndirectCapture(Unit *unit)
-{
-    struct priv * const priv = unit->data;
-    TIM_TypeDef * const TIMx = priv->TIMx;
-    const uint32_t ll_ch_a = priv->ll_ch_a;
-    const uint32_t ll_ch_b = priv->ll_ch_b;
-
-    UFCAP_ClearTimerConfig(unit);
-
-    // Enable channels and select mapping to TIx signals
-
-    // A - will be used to measure period
-    // B - will be used to measure the duty cycle
-
-    //         _________                  ______
-    // _______|         |________________|
-    //        A         B                A
-    //        irq       irq,cap          irq
-    //        reset
-
-    // B irq may be used if we want to measure a pulse width
-
-    // Normally TI1 = CH1, TI2 = CH2.
-    // It's possible to select the other channel, which we use to connect both TIx to the shame CHx.
-    LL_TIM_IC_SetActiveInput(TIMx, ll_ch_a, priv->a_direct ? LL_TIM_ACTIVEINPUT_DIRECTTI   : LL_TIM_ACTIVEINPUT_INDIRECTTI);
-    LL_TIM_IC_SetActiveInput(TIMx, ll_ch_b, priv->a_direct ? LL_TIM_ACTIVEINPUT_INDIRECTTI : LL_TIM_ACTIVEINPUT_DIRECTTI);
-    LL_TIM_IC_SetPolarity(TIMx, ll_ch_a, priv->active_level ? LL_TIM_IC_POLARITY_RISING : LL_TIM_IC_POLARITY_FALLING);
-    LL_TIM_IC_SetPolarity(TIMx, ll_ch_b, priv->active_level ? LL_TIM_IC_POLARITY_FALLING : LL_TIM_IC_POLARITY_RISING);
-
-    if (priv->dfilter > 15) priv->dfilter = 15;
-    uint32_t filter = LL_TIM_IC_FILTERS[priv->dfilter];
-    LL_TIM_IC_SetFilter(TIMx, ll_ch_a, filter);
-    LL_TIM_IC_SetFilter(TIMx, ll_ch_b, filter);
-
-    LL_TIM_CC_EnableChannel(TIMx, ll_ch_a | ll_ch_b);
-
-    LL_TIM_SetSlaveMode(TIMx, LL_TIM_SLAVEMODE_RESET);
-    LL_TIM_SetTriggerInput(TIMx, LL_TIM_TS_TI1FP1); // Use Filtered Input 1 (TI1)
-
-    LL_TIM_EnableMasterSlaveMode(TIMx);
-
-    LL_TIM_ClearFlag_CC1(TIMx);
-    LL_TIM_ClearFlag_CC1OVR(TIMx);
-    LL_TIM_ClearFlag_CC2(TIMx);
-    LL_TIM_ClearFlag_CC2OVR(TIMx);
-
-    LL_TIM_EnableIT_CC1(TIMx);
-    LL_TIM_EnableIT_CC2(TIMx);
-    LL_TIM_EnableCounter(TIMx);
-}
-
-
-/**
- * Configure peripherals for an indirect capture (PWM measurement) - continuous or burst
- * @param unit
- */
-static void UFCAP_ConfigureForDirectCapture(Unit *unit, uint16_t msec)
-{
-    struct priv * const priv = unit->data;
-
-//    dbg("Configuring Direct capture...");
-
-    UFCAP_ClearTimerConfig(unit);
-
-    {
-        TIM_TypeDef *const TIMy = priv->TIMy;
-        assert_param(PLAT_AHB_MHZ<=65);
-        uint16_t presc = PLAT_AHB_MHZ*1000;
-        uint32_t count = msec+1; // it's one tick longer because we generate OCREF on the exact msec count - it must be at least 1 tick long
-
-        LL_TIM_SetPrescaler(TIMy, (uint32_t) (presc - 1));
-        LL_TIM_SetAutoReload(TIMy, count - 1);
-        LL_TIM_EnableARRPreload(TIMy);
-        LL_TIM_GenerateEvent_UPDATE(TIMy);
-        LL_TIM_SetOnePulseMode(TIMy, LL_TIM_ONEPULSEMODE_SINGLE);
-        LL_TIM_OC_EnableFast(TIMy, LL_TIM_CHANNEL_CH1);
-
-//        dbg("TIMy presc %d, count %d", (int) presc, (int) count);
-
-        LL_TIM_SetTriggerOutput(TIMy, LL_TIM_TRGO_OC1REF);
-        LL_TIM_OC_SetMode(TIMy, LL_TIM_CHANNEL_CH1, LL_TIM_OCMODE_PWM1); // 1 until CC, then 0
-        LL_TIM_OC_SetCompareCH1(TIMy, count-1);
-        LL_TIM_CC_EnableChannel(TIMy, LL_TIM_CHANNEL_CH1); // enable the output channel that produces a trigger
-
-        LL_TIM_ClearFlag_UPDATE(TIMy);
-        LL_TIM_EnableIT_UPDATE(TIMy);
-    }
-
-    {
-        // TIMx - the slave
-        TIM_TypeDef *const TIMx = priv->TIMx;
-        LL_TIM_SetSlaveMode(TIMx, LL_TIM_SLAVEMODE_GATED);
-        LL_TIM_SetTriggerInput(TIMx, LL_TIM_TS_ITR3); // ITR3 is TIM14 which we use as TIMy
-        LL_TIM_EnableMasterSlaveMode(TIMx);
-
-        uint32_t presc = LL_TIM_ETR_PRESCALER_DIV1;
-        switch (priv->direct_presc) {
-            case 1: presc = LL_TIM_ETR_PRESCALER_DIV1; break;
-            case 2: presc = LL_TIM_ETR_PRESCALER_DIV2; break;
-            case 4: presc = LL_TIM_ETR_PRESCALER_DIV4; break;
-            case 8: presc = LL_TIM_ETR_PRESCALER_DIV8; break;
-            default:
-                priv->direct_presc = 1; // will be sent with the response
-        }
-
-        if (priv->dfilter > 15) priv->dfilter = 15;
-        uint32_t filter = LL_TIM_ETR_FILTERS[priv->dfilter];
-
-        LL_TIM_ConfigETR(TIMx,
-                         priv->active_level ? LL_TIM_ETR_POLARITY_NONINVERTED : LL_TIM_ETR_POLARITY_INVERTED,
-                         presc,
-                         filter);
-
-        LL_TIM_EnableExternalClock(TIMx); // TODO must check and deny this mode if the pin is not on CH1 = external trigger input
-
-        LL_TIM_SetCounter(TIMx, 0);
-        LL_TIM_EnableCounter(TIMx);
-    }
-
-    LL_TIM_EnableCounter(priv->TIMy); // XXX this will start the first pulse (maybe)
-}
-
-
-/**
- * Freerunning capture (counting pulses - geiger)
- * @param unit
- */
-static void UFCAP_ConfigureForFreeCapture(Unit *unit)
-{
-    struct priv * const priv = unit->data;
-
-    UFCAP_ClearTimerConfig(unit);
-
-    TIM_TypeDef *const TIMx = priv->TIMx;
-    LL_TIM_EnableExternalClock(TIMx);
-    LL_TIM_SetCounter(TIMx, 0);
-    LL_TIM_EnableCounter(TIMx);
-}
--- a/units/fcap/_fcap_init.c
+++ b/units/fcap/_fcap_init.c
@ -1,147 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-
-#define FCAP_INTERNAL
-#include "_fcap_internal.h"
-
-/** Allocate data structure and set defaults */
-error_t UFCAP_preInit(Unit *unit)
-{
-    struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
-    if (priv == NULL) return E_OUT_OF_MEM;
-
-    priv->conf.signal_pname = 'A';
-    priv->conf.signal_pnum = 0;
-
-    priv->conf.active_level = 1;
-    priv->conf.direct_presc = 1;
-    priv->conf.dfilter = 0;
-    priv->conf.direct_msec = 1000;
-    priv->conf.startmode = OPMODE_IDLE;
-
-    return E_SUCCESS;
-}
-
-/** Finalize unit set-up */
-error_t UFCAP_init(Unit *unit)
-{
-    bool suc = true;
-    struct priv *priv = unit->data;
-
-    // ---- Resolve what to configure ----
-
-    TIM_TypeDef * const TIMx = TIM2;
-    Resource timRsc = R_TIM2;
-
-    TIM_TypeDef * const TIMy = TIM14;
-    Resource tim2Rsc = R_TIM14;
-
-    uint32_t ll_ch_a = 0;
-    uint32_t ll_ch_b = 0;
-
-    switch (priv->conf.signal_pname) {
-        case 'A':
-            switch (priv->conf.signal_pnum) {
-                case 5:
-                case 15:
-                case 0: ll_ch_a = LL_TIM_CHANNEL_CH1; break;
-                case 1: ll_ch_a = LL_TIM_CHANNEL_CH2; break;
-                default:
-                    dbg("Bad signal pin!");
-                    return E_BAD_CONFIG;
-            }
-            break;
-        case 'B':
-            switch (priv->conf.signal_pnum) {
-                case 3: ll_ch_a = LL_TIM_CHANNEL_CH2; break;
-                default:
-                    dbg("Bad signal pin!");
-                    return E_BAD_CONFIG;
-            }
-            break;
-
-        default:
-            dbg("Bad signal pin port!");
-            return E_BAD_CONFIG;
-    }
-    const uint32_t ll_timpin_af = LL_GPIO_AF_2;
-
-    bool a_direct = true;
-    switch (ll_ch_a) {
-        case LL_TIM_CHANNEL_CH1:
-            ll_ch_b = LL_TIM_CHANNEL_CH2;
-            break;
-
-        case LL_TIM_CHANNEL_CH2:
-            ll_ch_b = LL_TIM_CHANNEL_CH1;
-            a_direct = false;
-            break;
-    }
-
-    // ---- CLAIM ----
-
-    TRY(rsc_claim_pin(unit, priv->conf.signal_pname, priv->conf.signal_pnum));
-    TRY(rsc_claim(unit, timRsc));
-    TRY(rsc_claim(unit, tim2Rsc));
-
-    // ---- INIT ----
-    assert_param(ll_ch_a != ll_ch_b);
-
-    priv->TIMx = TIMx;
-    priv->TIMy = TIMy;
-    priv->ll_ch_a = ll_ch_a;
-    priv->ll_ch_b = ll_ch_b;
-    priv->a_direct = a_direct;
-
-    // Load defaults
-    priv->active_level = priv->conf.active_level;
-    priv->direct_presc = priv->conf.direct_presc;
-    priv->dfilter = priv->conf.dfilter;
-    priv->direct_msec = priv->conf.direct_msec;
-    priv->opmode = priv->conf.startmode;
-
-    TRY(hw_configure_gpio_af(priv->conf.signal_pname, priv->conf.signal_pnum, ll_timpin_af));
-
-    GPIO_TypeDef *gpio = hw_port2periph(priv->conf.signal_pname, &suc);
-    uint32_t ll_pin = hw_pin2ll(priv->conf.signal_pnum, &suc);
-    LL_GPIO_SetPinPull(gpio, ll_pin, LL_GPIO_PULL_DOWN); // XXX change to pull-up if the polarity is inverted
-
-    hw_periph_clock_enable(TIMx);
-    hw_periph_clock_enable(TIMy);
-    irqd_attach(TIMx, UFCAP_TIMxHandler, unit);
-    irqd_attach(TIMy, UFCAP_TIMyHandler, unit);
-
-    UFCAP_SwitchMode(unit, priv->opmode); // switch to the default opmode
-
-    return E_SUCCESS;
-}
-
-/** Tear down the unit */
-void UFCAP_deInit(Unit *unit)
-{
-    struct priv *priv = unit->data;
-
-    // de-init peripherals
-    if (unit->status == E_SUCCESS ) {
-        UFCAP_SwitchMode(unit, OPMODE_IDLE);
-
-        TIM_TypeDef *TIMx = priv->TIMx;
-        TIM_TypeDef *TIMy = priv->TIMy;
-        LL_TIM_DeInit(TIMx);
-        LL_TIM_DeInit(TIMy);
-        irqd_detach(TIMx, UFCAP_TIMxHandler);
-        irqd_detach(TIMy, UFCAP_TIMyHandler);
-        hw_periph_clock_disable(TIMx);
-        hw_periph_clock_disable(TIMy);
-    }
-
-    // Release all resources, deinit pins
-    rsc_teardown(unit);
-
-    // Free memory
-    free_ck(unit->data);
-}
--- a/units/fcap/_fcap_internal.h
+++ b/units/fcap/_fcap_internal.h
@ -1,117 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#ifndef GEX_F072_FCAP_INTERNAL_H
-#define GEX_F072_FCAP_INTERNAL_H
-
-#ifndef FCAP_INTERNAL
-#error bad include!
-#endif
-
-#include "unit_base.h"
-
-enum fcap_opmode {
-    OPMODE_IDLE = 0,
-    OPMODE_BUSY = 1, // used after capture is done, before it's reported
-    OPMODE_INDIRECT_CONT = 2,
-    OPMODE_INDIRECT_BURST = 3, // averaging
-    OPMODE_DIRECT_CONT = 4,
-    OPMODE_DIRECT_BURST = 5,
-    OPMODE_FREE_COUNTER = 6,
-    OPMODE_SINGLE_PULSE = 7,
-};
-
-/** Private data structure */
-struct priv {
-    // settings
-    struct {
-        char signal_pname;   // the input pin - one of TIM2 channels
-        uint8_t signal_pnum;
-
-        bool active_level;
-        uint8_t direct_presc;
-        uint8_t dfilter;
-        uint16_t direct_msec;
-
-        enum fcap_opmode startmode;
-    } conf;
-
-    // internal state
-    TIM_TypeDef *TIMx;
-    TIM_TypeDef *TIMy; // used as a timebase source for TIMx in direct mode
-    uint32_t ll_ch_b;
-    uint32_t ll_ch_a;
-    bool a_direct;
-
-    enum fcap_opmode opmode;
-
-    TF_ID request_id;
-    uint8_t n_skip; //!< Periods to skip before starting the real capture
-
-    bool active_level; // in PWM mode, the first part that is measured. (if 1, HHHLLL, else LLLHHH). In direct mode, clock polarity
-    uint8_t direct_presc;
-    uint16_t direct_msec;
-    uint8_t dfilter;
-
-    union {
-        struct {
-            uint32_t ontime; // length of the captured positive pulse in the current interval
-            uint32_t last_period; //!< length of the captured interval between two rising edges
-            uint32_t last_ontime; //!< length of the last captured ontime
-        } ind_cont;
-
-        struct {
-            uint32_t ontime; // length of the captured positive pulse in the current interval
-            uint64_t period_acu; //!< length of the captured interval between two rising edges, sum
-            uint64_t ontime_acu; //!< length of the last captured ontime, sum
-            uint16_t n_count; //!< Periods captured
-            uint16_t n_target; //!< Periods captured - requested count
-        } ind_burst;
-
-        struct {
-            uint32_t last_count; //!< Pulse count in the last capture window
-        } dir_cont;
-
-        struct {
-            uint16_t msec; // capture window length (used in the report callback) - different from the cont time, which is a semi-persistent config
-        } dir_burst;
-    };
-};
-
-/** Allocate data structure and set defaults */
-error_t UFCAP_preInit(Unit *unit);
-
-/** Load from a binary buffer stored in Flash */
-void UFCAP_loadBinary(Unit *unit, PayloadParser *pp);
-
-/** Write to a binary buffer for storing in Flash */
-void UFCAP_writeBinary(Unit *unit, PayloadBuilder *pb);
-
-// ------------------------------------------------------------------------
-
-/** Parse a key-value pair from the INI file */
-error_t UFCAP_loadIni(Unit *unit, const char *key, const char *value);
-
-/** Generate INI file section for the unit */
-void UFCAP_writeIni(Unit *unit, IniWriter *iw);
-
-// ------------------------------------------------------------------------
-
-/** Finalize unit set-up */
-error_t UFCAP_init(Unit *unit);
-
-/** Tear down the unit */
-void UFCAP_deInit(Unit *unit);
-
-// ------------------------------------------------------------------------
-
-void UFCAP_SwitchMode(Unit *unit, enum fcap_opmode opmode);
-
-void UFCAP_TIMxHandler(void *arg);
-void UFCAP_TIMyHandler(void *arg);
-
-uint32_t UFCAP_GetFreeCounterValue(Unit *unit);
-uint32_t UFCAP_FreeCounterClear(Unit *unit);
-
-#endif //GEX_F072_FCAP_INTERNAL_H
--- a/units/fcap/_fcap_settings.c
+++ b/units/fcap/_fcap_settings.c
@ -1,114 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-
-#define FCAP_INTERNAL
-#include "_fcap_internal.h"
-
-/** Load from a binary buffer stored in Flash */
-void UFCAP_loadBinary(Unit *unit, PayloadParser *pp)
-{
-    struct priv *priv = unit->data;
-
-    uint8_t version = pp_u8(pp);
-    (void)version;
-
-    priv->conf.signal_pname = pp_char(pp);
-    priv->conf.signal_pnum = pp_u8(pp);
-    priv->conf.active_level = pp_bool(pp);
-    priv->conf.dfilter = pp_u8(pp);
-    priv->conf.direct_presc = pp_u8(pp);
-    priv->conf.direct_msec = pp_u16(pp);
-    priv->conf.startmode = (enum fcap_opmode) pp_u8(pp);
-}
-
-/** Write to a binary buffer for storing in Flash */
-void UFCAP_writeBinary(Unit *unit, PayloadBuilder *pb)
-{
-    struct priv *priv = unit->data;
-
-    pb_u8(pb, 0); // version
-
-    pb_char(pb, priv->conf.signal_pname);
-    pb_u8(pb, priv->conf.signal_pnum);
-    pb_bool(pb, priv->conf.active_level);
-    pb_u8(pb, priv->conf.dfilter);
-    pb_u8(pb, priv->conf.direct_presc);
-    pb_u16(pb, priv->conf.direct_msec);
-    pb_u8(pb, priv->conf.startmode);
-}
-
-// ------------------------------------------------------------------------
-
-/** Parse a key-value pair from the INI file */
-error_t UFCAP_loadIni(Unit *unit, const char *key, const char *value)
-{
-    bool suc = true;
-    struct priv *priv = unit->data;
-
-    if (streq(key, "pin")) {
-        suc = cfg_portpin_parse(value, &priv->conf.signal_pname, &priv->conf.signal_pnum);
-    }
-    else if (streq(key, "active-level")) {
-        priv->conf.active_level = cfg_bool_parse(value, &suc);
-    }
-    else if (streq(key, "input-filter")) {
-        priv->conf.dfilter = cfg_u8_parse(value, &suc);
-    }
-    else if (streq(key, "direct-presc")) {
-        priv->conf.direct_presc = cfg_u8_parse(value, &suc);
-    }
-    else if (streq(key, "direct-time")) {
-        priv->conf.direct_msec = cfg_u16_parse(value, &suc);
-    }
-    else if (streq(key, "initial-mode")) {
-        priv->conf.startmode = (enum fcap_opmode) cfg_enum4_parse(value,
-                                                                  "N", OPMODE_IDLE,
-                                                                  "I", OPMODE_INDIRECT_CONT,
-                                                                  "D", OPMODE_DIRECT_CONT,
-                                                                  "F", OPMODE_FREE_COUNTER,
-                                                                  &suc);
-    }
-    else{
-        return E_BAD_KEY;
-    }
-
-    if (!suc) return E_BAD_VALUE;
-    return E_SUCCESS;
-}
-
-/** Generate INI file section for the unit */
-void UFCAP_writeIni(Unit *unit, IniWriter *iw)
-{
-    struct priv *priv = unit->data;
-
-    iw_comment(iw, "Signal input pin - one of:");
-    iw_comment(iw, " Full support:  A0, A5, A15");
-    iw_comment(iw, " Indirect only: A1, B3");
-    iw_entry(iw, "pin", "%c%d", priv->conf.signal_pname,  priv->conf.signal_pnum);
-    iw_cmt_newline(iw);
-
-    iw_comment(iw, "Active level or edge (0-low,falling; 1-high,rising)");
-    iw_entry_d(iw, "active-level", priv->conf.active_level);
-
-    iw_comment(iw, "Input filtering (0-15)");
-    iw_entry_d(iw, "input-filter", priv->conf.dfilter);
-
-    iw_comment(iw, "Pulse counter pre-divider (1,2,4,8)");
-    iw_entry_d(iw, "direct-presc", priv->conf.direct_presc);
-
-    iw_comment(iw, "Pulse counting interval (ms)");
-    iw_entry_d(iw, "direct-time", priv->conf.direct_msec);
-    iw_cmt_newline(iw);
-
-    iw_comment(iw, "Mode on startup: N-none, I-indirect, D-direct, F-free count");
-    iw_entry_s(iw, "initial-mode", cfg_enum4_encode(priv->conf.startmode,
-                                                  OPMODE_IDLE, "N",
-                                                  OPMODE_INDIRECT_CONT, "I",
-                                                  OPMODE_DIRECT_CONT, "D",
-                                                  OPMODE_FREE_COUNTER, "F"));
-}
-
--- a/units/fcap/unit_fcap.c
+++ b/units/fcap/unit_fcap.c
@ -1,322 +0,0 @@
-//
-// Created by MightyPork on 2017/11/25.
-//
-
-#include "unit_base.h"
-#include "unit_fcap.h"
-
-#define FCAP_INTERNAL
-#include "_fcap_internal.h"
-
-// ------------------------------------------------------------------------
-
-enum FcapCmd_ {
-    CMD_STOP = 0,
-
-    // Measuring a waveform
-    CMD_INDIRECT_CONT_START = 1,  // keep measuring, read on demand
-    CMD_INDIRECT_BURST_START = 2, // wait and reply
-
-    // Counting pulses
-    CMD_DIRECT_CONT_START = 3,  // keep measuring, read on demand
-    CMD_DIRECT_BURST_START = 4, // wait and reply
-    CMD_FREECOUNT_START = 5,    // keep counting pulses until stopped, read on reply
-
-    CMD_MEASURE_SINGLE_PULSE = 6, // measure the first incoming pulse of the right polarity. NOTE: can glitch if the signal starts in the active level
-    CMD_FREECOUNT_CLEAR = 7, // clear the free counter, return last value
-
-    // Results readout for continuous modes
-    CMD_INDIRECT_CONT_READ = 10,
-    CMD_DIRECT_CONT_READ = 11,
-    CMD_FREECOUNT_READ = 12,
-
-    // configs
-    CMD_SET_POLARITY = 20,
-    CMD_SET_DIR_PRESC = 21,
-    CMD_SET_INPUT_FILTER = 22,
-    CMD_SET_DIR_MSEC = 23,
-
-    // go back to the configured settings
-    CMD_RESTORE_DEFAULTS = 30,
-};
-
-/** Handle a request message */
-static error_t UFCAP_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, PayloadParser *pp)
-{
-    uint8_t presc;
-    uint16_t msec;
-
-    struct priv *priv = unit->data;
-    PayloadBuilder pb = pb_start(unit_tmp512, UNIT_TMP_LEN, NULL);
-    const char* msg_denied_on_pin = "Not available on the selected pin!";
-
-    switch (command) {
-        /**
-         * Stop any ongoing measurement and return to base state.
-         */
-        case CMD_STOP:
-            UFCAP_SwitchMode(unit, OPMODE_IDLE);
-            return E_SUCCESS;
-
-        // ----------------------- CONFIG --------------------------
-
-        /**
-         * Set the active polarity, or triggering edge (for direct)
-         *
-         * pld: pol:u8 (0,1)
-         */
-        case CMD_SET_POLARITY:
-            {
-                priv->active_level = pp_bool(pp);
-            }
-            return E_SUCCESS;
-
-        /**
-         * Set the direct measurement prescaller 1,2,4,8
-         *
-         * pld: presc:u8
-         */
-        case CMD_SET_DIR_PRESC:
-            {
-                presc = pp_u8(pp);
-                if (presc != 1 && presc != 2 && presc != 4 && presc != 8) return E_BAD_VALUE;
-                priv->direct_presc = presc;
-            }
-            return E_SUCCESS;
-
-        /**
-         * Set the input filter for all modes
-         *
-         * pld: filter:u8 (0-15)
-         */
-        case CMD_SET_INPUT_FILTER:
-            {
-                uint8_t input_filter = pp_u8(pp);
-                if (input_filter >= 16) return E_BAD_VALUE;
-                priv->dfilter = input_filter;
-            }
-            return E_SUCCESS;
-
-        /**
-         * Set the direct sampling time.
-         *
-         * pld: msec:u16
-         */
-        case CMD_SET_DIR_MSEC:
-            {
-                msec = pp_u16(pp);
-                priv->direct_msec = msec;
-            }
-            return E_SUCCESS;
-
-        /**
-         * Reset all SET* settings to their default values, stop any ongoing measure.
-         */
-        case CMD_RESTORE_DEFAULTS:
-            UFCAP_SwitchMode(unit, OPMODE_IDLE);
-
-            priv->active_level = priv->conf.active_level;
-            priv->direct_presc = priv->conf.direct_presc;
-            priv->direct_msec = priv->conf.direct_msec;
-            priv->dfilter = priv->conf.dfilter;
-            return E_SUCCESS;
-
-        // ------------------ COMMANDS ------------------------
-
-        /**
-         * Start indirect continuous measurement.
-         */
-        case CMD_INDIRECT_CONT_START:
-            if (priv->opmode == OPMODE_INDIRECT_CONT) return E_SUCCESS; // no-op
-            if (priv->opmode != OPMODE_IDLE) return E_BUSY;
-
-            UFCAP_SwitchMode(unit, OPMODE_INDIRECT_CONT);
-            return E_SUCCESS;
-
-        /**
-         * Start a continuous direct measurement (counting pulses in fixed time intervals)
-         *
-         * - meas_time_ms 0 = no change
-         * - prescaller 0 = no change
-         *
-         * pld: meas_time_ms:u16, prescaller:u8
-         * - prescaller is 1,2,4,8; 0 = no change
-         */
-        case CMD_DIRECT_CONT_START:
-            if (!priv->a_direct) {
-                // This works only if we use the ETR pin. TIM2 shares CH1 with ETR.
-                // If CH2 is selected as input, ETR is not available.
-                com_respond_str(MSG_ERROR, frame_id, msg_denied_on_pin);
-                return E_FAILURE;
-            }
-            if (priv->opmode == OPMODE_DIRECT_CONT) return E_SUCCESS; // no-op
-            if (priv->opmode != OPMODE_IDLE) return E_BUSY;
-
-            msec = pp_u16(pp);
-            presc = pp_u8(pp);
-            if (msec != 0) priv->direct_msec = msec;
-            if (presc != 0) priv->direct_presc = presc;
-
-            UFCAP_SwitchMode(unit, OPMODE_DIRECT_CONT);
-            return E_SUCCESS;
-
-        /**
-         * Start a burst of direct measurements with averaging.
-         * The measurement is performed on N consecutive pulses.
-         *
-         * pld: count:u16
-         *
-         * resp: core_mhz:u16, count:u16, period_sum:u64, ontime_sum:u64
-         */
-        case CMD_INDIRECT_BURST_START:
-            if (priv->opmode != OPMODE_IDLE) return E_BAD_MODE;
-
-            priv->ind_burst.n_target = pp_u16(pp);
-            priv->request_id = frame_id;
-            UFCAP_SwitchMode(unit, OPMODE_INDIRECT_BURST);
-            return E_SUCCESS;
-
-        /**
-         * Start a single direct measurement of the given length (pulses in time period)
-         * If 'prescaller' is not 0, it is changed via the param field.
-         *
-         * pld: meas_time_ms:u16, prescaller:u8
-         * - prescaller is 1,2,4,8; 0 = no change
-         *
-         * resp: prescaller:u8, meas_time_ms:u16, pulse_count:u32
-         */
-        case CMD_DIRECT_BURST_START:
-            if (priv->opmode != OPMODE_IDLE) return E_BAD_MODE;
-
-            priv->dir_burst.msec = pp_u16(pp);
-
-            presc = pp_u8(pp);
-            if (presc != 0) priv->direct_presc = presc;
-
-            priv->request_id = frame_id;
-            UFCAP_SwitchMode(unit, OPMODE_DIRECT_BURST);
-            return E_SUCCESS;
-
-        /**
-         * Measure a single pulse length of the given polarity.
-         * Measures time from a rising to a falling edge (or falling to rising, if polarity is 0)
-         *
-         * resp: core_mhz:u16, ontime:u32
-         */
-        case CMD_MEASURE_SINGLE_PULSE:
-            if (priv->opmode != OPMODE_IDLE) return E_BAD_MODE;
-            priv->request_id = frame_id;
-            UFCAP_SwitchMode(unit, OPMODE_SINGLE_PULSE);
-            return E_SUCCESS;
-
-        /**
-         * Start a free-running pulse counter.
-         *
-         * pld: prescaller:u8
-         * - prescaller is 1,2,4,8; 0 = no change
-         */
-        case CMD_FREECOUNT_START:
-            if (priv->opmode != OPMODE_IDLE) return E_BAD_MODE;
-
-            presc = pp_u8(pp);
-            if (presc != 0) priv->direct_presc = presc;
-
-            UFCAP_SwitchMode(unit, OPMODE_FREE_COUNTER);
-            return E_SUCCESS;
-
-        /**
-         * Reset the free-running pulse counter.
-         *
-         * resp: last_val:u32
-         */
-        case CMD_FREECOUNT_CLEAR:
-            if (priv->opmode != OPMODE_FREE_COUNTER) {
-                return E_BAD_MODE;
-            }
-
-            pb_u32(&pb, UFCAP_FreeCounterClear(unit));
-            com_respond_pb(frame_id, MSG_SUCCESS, &pb);
-            return E_SUCCESS;
-
-        // ------------------ READING ---------------------
-
-        /**
-         * Read the most recent pulse measurement during continuous indirect measure.
-         *
-         * resp: core_mhz:u16, period:u32, ontime:u32
-         */
-        case CMD_INDIRECT_CONT_READ:
-            if (priv->opmode != OPMODE_INDIRECT_CONT) {
-                return E_BAD_MODE;
-            }
-            if (priv->ind_cont.last_period == 0) {
-                return E_BUSY;
-            }
-
-            pb_u16(&pb, PLAT_AHB_MHZ);
-            pb_u32(&pb, priv->ind_cont.last_period);
-            pb_u32(&pb, priv->ind_cont.last_ontime);
-
-            com_respond_pb(frame_id, MSG_SUCCESS, &pb);
-            return E_SUCCESS;
-
-        /**
-         * Read the most recent result of a continuous direct measurement.
-         *
-         * resp: prescaller:u8, meas_time_ms:u16, pulse_count:u32
-         */
-        case CMD_DIRECT_CONT_READ:
-            if (!priv->a_direct) { // see above
-                com_respond_str(MSG_ERROR, frame_id, msg_denied_on_pin);
-                return E_FAILURE;
-            }
-            if (priv->opmode != OPMODE_DIRECT_CONT) return E_BAD_MODE;
-            if (priv->dir_cont.last_count == 0) return E_BUSY;
-
-            pb_u8(&pb, priv->direct_presc);
-            pb_u16(&pb, priv->direct_msec);
-            pb_u32(&pb, priv->dir_cont.last_count);
-
-            com_respond_pb(frame_id, MSG_SUCCESS, &pb);
-            return E_SUCCESS;
-
-        /**
-         * Read the current value of the free-running pulse counter.
-         *
-         * The timing may have a significant jitter, this function is practically useful only for
-         * slow pulse sources (like a geiger counter, item counting etc)
-         *
-         * resp: count:u32
-         */
-        case CMD_FREECOUNT_READ:
-            if (priv->opmode != OPMODE_FREE_COUNTER) {
-                return E_BAD_MODE;
-            }
-
-            pb_u32(&pb, UFCAP_GetFreeCounterValue(unit));
-            com_respond_pb(frame_id, MSG_SUCCESS, &pb);
-            return E_SUCCESS;
-
-        default:
-            return E_UNKNOWN_COMMAND;
-    }
-}
-
-// ------------------------------------------------------------------------
-
-/** Frequency capture */
-const UnitDriver UNIT_FCAP = {
-    .name = "FCAP",
-    .description = "Frequency and pulse measurement",
-    // Settings
-    .preInit = UFCAP_preInit,
-    .cfgLoadBinary = UFCAP_loadBinary,
-    .cfgWriteBinary = UFCAP_writeBinary,
-    .cfgLoadIni = UFCAP_loadIni,
-    .cfgWriteIni = UFCAP_writeIni,
-    // Init
-    .init = UFCAP_init,
-    .deInit = UFCAP_deInit,
-    // Function
-    .handleRequest = UFCAP_handleRequest,
-};
--- a/units/fcap/unit_fcap.h
+++ b/units/fcap/unit_fcap.h
@ -1,16 +0,0 @@
-//
-// Created by MightyPork on 2017/11/25.
-//
-// Digital input unit; single or multiple pin read access on one port (A-F)
-//
-
-#ifndef U_FCAP_H
-#define U_FCAP_H
-
-#include "unit.h"
-
-extern const UnitDriver UNIT_FCAP;
-
-// UU_ prototypes
-
-#endif //U_FCAP_H
--- a/units/i2c/_i2c_api.c
+++ b/units/i2c/_i2c_api.c
@ -1,123 +0,0 @@
-//
-// Created by MightyPork on 2018/02/03.
-//
-
-#include "platform.h"
-#include "unit_base.h"
-#include "unit_i2c.h"
-
-#define I2C_INTERNAL
-#include "_i2c_internal.h"
-
-static void i2c_reset(struct priv *priv)
-{
-    LL_I2C_Disable(priv->periph);
-    HAL_Delay(1);
-    LL_I2C_Enable(priv->periph);
-}
-
-static error_t i2c_wait_until_flag(struct priv *priv, uint32_t flag, bool stop_state)
-{
-    uint32_t t_start = HAL_GetTick();
-    while (((priv->periph->ISR & flag)!=0) != stop_state) {
-        if (HAL_GetTick() - t_start > 10) {
-            i2c_reset(priv);
-            return E_HW_TIMEOUT;
-        }
-    }
-    return E_SUCCESS;
-}
-
-error_t UU_I2C_Write(Unit *unit, uint16_t addr, const uint8_t *bytes, uint32_t bcount)
-{
-    CHECK_TYPE(unit, &UNIT_I2C);
-
-    struct priv *priv = unit->data;
-
-    uint8_t addrsize = (uint8_t) (((addr & 0x8000) == 0) ? 7 : 10);
-    addr &= 0x3FF;
-    uint32_t ll_addrsize = (addrsize == 7) ? LL_I2C_ADDRSLAVE_7BIT : LL_I2C_ADDRSLAVE_10BIT;
-    if (addrsize == 7) addr <<= 1; // 7-bit address must be shifted to left for LL to use it correctly
-
-    TRY(i2c_wait_until_flag(priv, I2C_ISR_BUSY, 0));
-
-    bool first = true;
-    while (bcount > 0) {
-        uint32_t len = bcount;
-        uint32_t chunk_remain = (uint8_t) ((len > 255) ? 255 : len); // if more than 255, first chunk is 255
-        LL_I2C_HandleTransfer(priv->periph, addr, ll_addrsize, chunk_remain,
-                              (len > 255) ? LL_I2C_MODE_RELOAD : LL_I2C_MODE_AUTOEND, // Autoend if this is the last chunk
-                              first ? LL_I2C_GENERATE_START_WRITE : LL_I2C_GENERATE_NOSTARTSTOP); // no start/stop condition if we're continuing
-        first = false;
-        bcount -= chunk_remain;
-
-        for (; chunk_remain > 0; chunk_remain--) {
-            TRY(i2c_wait_until_flag(priv, I2C_ISR_TXIS, 1));
-            uint8_t byte = *bytes++;
-            LL_I2C_TransmitData8(priv->periph, byte);
-        }
-    }
-
-    TRY(i2c_wait_until_flag(priv, I2C_ISR_STOPF, 1));
-    LL_I2C_ClearFlag_STOP(priv->periph);
-    return E_SUCCESS;
-}
-
-error_t UU_I2C_Read(Unit *unit, uint16_t addr, uint8_t *dest, uint32_t bcount)
-{
-    CHECK_TYPE(unit, &UNIT_I2C);
-
-    struct priv *priv = unit->data;
-
-    uint8_t addrsize = (uint8_t) (((addr & 0x8000) == 0) ? 7 : 10);
-    addr &= 0x3FF;
-    uint32_t ll_addrsize = (addrsize == 7) ? LL_I2C_ADDRSLAVE_7BIT : LL_I2C_ADDRSLAVE_10BIT;
-    if (addrsize == 7) addr <<= 1; // 7-bit address must be shifted to left for LL to use it correctly
-
-    TRY(i2c_wait_until_flag(priv, I2C_ISR_BUSY, 0));
-
-    bool first = true;
-    while (bcount > 0) {
-        if (!first) {
-            TRY(i2c_wait_until_flag(priv, I2C_ISR_TCR, 1));
-        }
-
-        uint8_t chunk_remain = (uint8_t) ((bcount > 255) ? 255 : bcount); // if more than 255, first chunk is 255
-        LL_I2C_HandleTransfer(priv->periph, addr, ll_addrsize, chunk_remain,
-                              (bcount > 255) ? LL_I2C_MODE_RELOAD : LL_I2C_MODE_AUTOEND, // Autoend if this is the last chunk
-                              first ? LL_I2C_GENERATE_START_READ : LL_I2C_GENERATE_NOSTARTSTOP); // no start/stop condition if we're continuing
-        first = false;
-        bcount -= chunk_remain;
-
-        for (; chunk_remain > 0; chunk_remain--) {
-            TRY(i2c_wait_until_flag(priv, I2C_ISR_RXNE, 1));
-
-            uint8_t byte = LL_I2C_ReceiveData8(priv->periph);
-            *dest++ = byte;
-        }
-    }
-
-    TRY(i2c_wait_until_flag(priv, I2C_ISR_STOPF, 1));
-    LL_I2C_ClearFlag_STOP(priv->periph);
-    return E_SUCCESS;
-}
-
-error_t UU_I2C_ReadReg(Unit *unit, uint16_t addr, uint8_t regnum, uint8_t *dest, uint32_t width)
-{
-    TRY(UU_I2C_Write(unit, addr, &regnum, 1));
-    TRY(UU_I2C_Read(unit, addr, dest, width));
-    return E_SUCCESS;
-}
-
-error_t UU_I2C_WriteReg(Unit *unit, uint16_t addr, uint8_t regnum, const uint8_t *bytes, uint32_t width)
-{
-    CHECK_TYPE(unit, &UNIT_I2C);
-
-    // we have to insert the address first - needs a buffer (XXX realistically the buffer needs 1-4 bytes + addr)
-    PayloadBuilder pb = pb_start((uint8_t*)unit_tmp512, UNIT_TMP_LEN, NULL);
-    pb_u8(&pb, regnum);
-    pb_buf(&pb, bytes, width);
-
-    TRY(UU_I2C_Write(unit, addr, (uint8_t *) unit_tmp512, pb_length(&pb)));
-    return E_SUCCESS;
-}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Ondřej Hruška	3d3d74f381	updated readme	6 years ago
Ondřej Hruška	20639b77a6	clean up for porting - move platform specific stuff into outer project	6 years ago
Ondřej Hruška	b8909fca06	makefile correction	6 years ago
Ondřej Hruška	54b72a4bf1	makefile improvements for a faster build	6 years ago
Ondřej Hruška	afee9ab6a3	fix build if debug uart is disabled	6 years ago
Ondřej Hruška	a1e9cf2a57	Modularization, stage 1 (core side) - units moved to F072	6 years ago
Ondřej Hruška	482a67c5d2	bump version to 1.0.0	7 years ago
Ondřej Hruška	9703408307	implemented makefile hack for optional unit inclusion (needs integration in platform.c)	7 years ago
Ondřej Hruška	b40825a75f	renumbered neopixel to make more sense in decadic	7 years ago
Ondřej Hruška	6bfa40ce9f	better neopixel commands for sparse writing	7 years ago
Ondřej Hruška	315da1fc82	Merge branch 'zero-port'	7 years ago
Ondřej Hruška	0bce53403f	gex zero support, also nrf remapping based on platform and optional disable	7 years ago
Ondřej Hruška	30d1762710	version	7 years ago
Ondřej Hruška	49c291dade	fix adc triggers frame format broken	7 years ago
Ondřej Hruška	02b0ceb139	adc EOS IRQ speedup with a lookup array, achievable up to 100kHz with short capture window	7 years ago
Ondřej Hruška	c0846f0bb7	Fix incorrect ADC channel counting with 16,17. Also make averaging toggleable. This bug caused wrong measurements, DAC distortion and instability with 16+17 and at least 1 other channel.	7 years ago
Ondřej Hruška	396501564a	Fixed DAC not correctly deinited causing INI crashes	7 years ago
Ondřej Hruška	041e4f5b70	version increment	7 years ago
Ondřej Hruška	4ede660471	Merge branch 'nordic'	7 years ago
Ondřej Hruška	73e134d0b6	cleaned up nordic config	7 years ago
Ondřej Hruška	dc78c4da41	add default settings for nordic	7 years ago
Ondřej Hruška	2bad5d69e6	possibly improved the rx routine	7 years ago
Ondřej Hruška	e4ae8e23fc	working nordic comm, tested. May need cleaning	7 years ago
Ondřej Hruška	2f4101a6e0	nordic fixes, still not working	7 years ago
Ondřej Hruška	5eec46c041	nordic implemented, need testing and fixes	7 years ago
Ondřej Hruška	9182c666ea	now it's possible to read and write SYSTEM.INI using bulk	7 years ago
Ondřej Hruška	a66c453820	support for reading ADC calibration values	7 years ago
Ondřej Hruška	de75f2d91c	use new GEX vid pid	7 years ago
Ondřej Hruška	e667a2dd3a	fixed some wrongly named enum constants	7 years ago
Ondřej Hruška	9b1d084308	Merge branch 'uart-comm'	7 years ago
Ondřej Hruška	102d5f5a4c	implemented fallback to physical usart and basis for wireless support in the future	7 years ago
Ondřej Hruška	1797f179b4	version 0.1, added readme and license	7 years ago
Ondřej Hruška	218d26fb7b	fix a spi bulk read bug	7 years ago
Ondřej Hruška	b9f82c8077	fix pb2 claimed on f072 as boot1 when boot1 is only a register flag on this chip	7 years ago
Ondřej Hruška	d1f8804a93	fixes in lock button	7 years ago
Ondřej Hruška	2e2dab9244	fix unit registry wrongly parsing comma separated list	7 years ago
Ondřej Hruška	e046be30b2	added MCO function for oscillator debugging	7 years ago
Ondřej Hruška	f9200fcc7d	some fixes for cfg button	7 years ago
Ondřej Hruška	ffec192a27	Merge branch 'dac'	7 years ago
Ondřej Hruška	9f40c6e4dd	DAC advanced features	7 years ago
Ondřej Hruška	b2066a9010	basic static DAC	7 years ago
Ondřej Hruška	590d550a09	pulse generation for digital out	7 years ago
Ondřej Hruška	274f2be6e0	compat with 072hub	7 years ago
Ondřej Hruška	76d1cd3a24	Merge branch 'faster'	7 years ago
Ondřej Hruška	3654bf2206	various speed-ups in TF_WriteImpl and elsewhere	7 years ago
Ondřej Hruška	5687196bdd	small speed up using larger buffer and multipart Tx	7 years ago