now it's possible to read and write SYSTEM.INI using bulk

comm/interfaces.c

@@ -18,7 +18,7 @@ enum ComportSelection gActiveComport = COMPORT_USB; // start with USB so the han
 static uint32_t last_switch_time = 0; // started with USB
 static bool xfer_verify_done = false;
 
-static void configure_interface(enum ComportSelection iface);
+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)
@@ -30,8 +30,8 @@ void com_switch_transfer_if_needed(void)
 
     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.
+            // 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
 
@@ -39,19 +39,30 @@ void com_switch_transfer_if_needed(void)
             if (0 == uadr) {
                 dbg("Not enumerated, assuming USB is dead");
 
-                // Fallback to bare USART
-                if (SystemSettings.use_comm_uart) {
-                    configure_interface(COMPORT_USART);
-                }
-                else if (SystemSettings.use_comm_nordic) {
-                    configure_interface(COMPORT_NORDIC); // this fallbacks to LoRa if LoRa enabled
-                }
-                else if (SystemSettings.use_comm_lora) {
-                    configure_interface(COMPORT_LORA);
-                }
-                else {
-                    dbg("No alternate com interface configured, leaving USB enabled.");
-                }
+                // Fallback to radio or bare USART
+                do {
+                    if (SystemSettings.use_comm_nordic) {
+                        if (configure_interface(COMPORT_NORDIC)) {
+                            break;
+                        }
+                    }
+
+                    if (SystemSettings.use_comm_lora) {
+                        if (configure_interface(COMPORT_LORA)) {
+                            break;
+                        }
+                    }
+
+                    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 0x%02x - OK", (int)uadr);
             }
@@ -131,7 +142,7 @@ void com_iface_flush_buffer(void)
     }
 }
 
-static void configure_interface(enum ComportSelection iface)
+static bool configure_interface(enum ComportSelection iface)
 {
     // Teardown
     if (gActiveComport == COMPORT_USB) {
@@ -146,11 +157,17 @@ static void configure_interface(enum ComportSelection iface)
         __HAL_RCC_USART2_CLK_DISABLE();
         irqd_detach(USART2, com_UsartIrqHandler);
     }
-    gActiveComport = COMPORT_NONE;
+    else if (gActiveComport == COMPORT_NORDIC) {
+        // TODO
+    }
+
+
+    gActiveComport = iface;
 
     // Init
     if (iface == COMPORT_USB) {
         trap("illegal"); // this never happens
+        return false;
     }
     else if (iface == COMPORT_USART) {
         dbg("Setting up UART transfer");
@@ -171,37 +188,28 @@ static void configure_interface(enum ComportSelection iface)
         LL_USART_SetTransferDirection(USART2, LL_USART_DIRECTION_TX_RX);
 
         LL_USART_Enable(USART2);
-    }
-    else {
-        if (iface == COMPORT_NORDIC) {
-            // Try to configure nordic
-            dbg("Setting up nRF transfer");
-
-            // TODO set up and check nRF transport
 
-            // On failure, try setting up LoRa
-            dbg("nRF failed to init");
-            if (SystemSettings.use_comm_lora) {
-                iface = COMPORT_LORA;
-            } else {
-                iface = COMPORT_NONE; // fail
-            }
-        }
+        return true; // always OK (TODO check voltage on Rx if it's 3V3 when idle?)
+    }
+    else if (iface == COMPORT_NORDIC) {
+        // Try to configure nordic
+        dbg("Setting up nRF transfer");
 
-        if (iface == COMPORT_LORA) {
-            // Try to configure nordic
-            dbg("Setting up LoRa transfer");
+        // TODO set up and check nRF transport
 
-            // TODO set up and check LoRa transport
 
-            dbg("LoRa failed to init");
-            iface = COMPORT_NONE; // fail
-        }
+        // On failure, try setting up LoRa
+        dbg("nRF failed to init");
+        return false;
     }
-
-    if (iface == COMPORT_NONE) {
-        dbg("NO COM PORT AVAILABLE!");
+    else if (iface == COMPORT_LORA) {
+        // Try to configure nordic
+        dbg("Setting up LoRa transfer");
+        // TODO set up and check LoRa transport
+        dbg("LoRa failed to init");
+        return false;
+    }
+    else {
+        trap("Bad iface %d", iface);
     }
-
-    gActiveComport = iface;
 }

comm/messages.c

@@ -58,26 +58,33 @@ 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;
-    settings_build_units_ini(&iw);
+    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)
 {
@@ -86,14 +93,29 @@ static TF_Result lst_ini_export(TinyFrame *tf, TF_Msg *msg)
     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->len = iw_measure_total(settings_build_units_ini, 1);
-    bulk->read = settings_bulkread_cb;
-    bulk->userdata = NULL;
+    bulk->read = ini_bulkread_cb;
+    bulk->userdata = (void *) (int)filenum;
+
+    if (filenum == 0) {
+        bulk->len = iw_measure_total(settings_build_units_ini, 1);
+    }
+    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;
 }
 
@@ -142,7 +164,7 @@ 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 +173,8 @@ 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;
 }

framework/system_settings.c

@@ -2,8 +2,6 @@
 // Created by MightyPork on 2017/12/02.
 //
 
-#include <platform/debug_uart.h>
-#include <comm/interfaces.h>
 #include "platform.h"
 #include "system_settings.h"
 #include "utils/str_utils.h"
@@ -11,6 +9,8 @@
 #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);
@@ -171,18 +171,34 @@ void systemsettings_build_ini(IniWriter *iw)
     iw_entry_d(iw, "mco-prediv", (1<<SystemSettings.mco_prediv));
 
     iw_cmt_newline(iw);
-    iw_comment(iw, "Allowed fallback communication ports");
+    iw_comment(iw, "--- Allowed fallback communication ports ---");
 
-    iw_comment(iw, "UART Tx:PA2, Rx:PA2");
+    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);
 
+    iw_cmt_newline(iw);
+    iw_comment(iw, "nRF24L01+ radio");
+    iw_entry_s(iw, "com-nrf", str_yn(SystemSettings.use_comm_nordic));
+
+    iw_comment(iw, "nRF channel");
+    iw_entry_d(iw, "nrf-channel", SystemSettings.nrf_channel);
+
+    iw_comment(iw, "nRF network ID (hex, 4 bytes, little-endian)");
+    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, "nRF node address (hex, 1 byte, > 0)");
+    iw_entry(iw, "nrf-address", "%02X",
+             SystemSettings.nrf_address);
+
     // those aren't implement yet, don't tease the user
     // TODO show pin-out, extra settings if applicable
 #if 0
-    iw_comment(iw, "nRF24L01+");
-    iw_entry_s(iw, "com-nordic", str_yn(SystemSettings.use_comm_nrf24l01p));
-
     iw_comment(iw, "LoRa/GFSK sx127x");
     iw_entry_s(iw, "com-lora", str_yn(SystemSettings.use_comm_sx127x));
 #endif
@@ -241,12 +257,24 @@ bool systemsettings_load_ini(const char *restrict key, const char *restrict valu
         if (suc) SystemSettings.comm_uart_baud = baud;
     }
 
-#if 0
-    if (streq(key, "com-nordic")) {
+    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")) {
+        cfg_hex_parse(&SystemSettings.nrf_address, 1, value, &suc);
+    }
+
+    if (streq(key, "nrf-network")) {
+        cfg_hex_parse(&SystemSettings.nrf_network[0], 4, value, &suc);
+    }
+
+#if 0
     if (streq(key, "com-lora")) {
         bool yn = cfg_bool_parse(value, &suc);
         if (suc) SystemSettings.use_comm_lora = yn;

framework/system_settings.h

@@ -27,6 +27,9 @@ struct system_settings {
     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

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 == ':') {
+            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;
+        }
+    }
+}

platform/cfg_utils.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"))