added missing mutex for shared scratch buffer

comm/msg_bulkread.c

@@ -11,7 +11,7 @@
 #include "utils/payload_builder.h"
 
 /** Buffer for preparing bulk chunks */
-static uint8_t bulkread_buffer[BULKREAD_MAX_CHUNK];
+static uint8_t bulkread_buffer[BULK_READ_BUF_LEN];
 
 /**
  * TF listener for the bulk read transaction
@@ -36,7 +36,7 @@ static TF_Result bulkread_lst(TinyFrame *tf, TF_Msg *msg)
         uint32_t chunk = pp_u32(&pp);
 
         chunk = MIN(chunk, bulk->len - bulk->offset);
-        chunk = MIN(chunk, BULKREAD_MAX_CHUNK);
+        chunk = MIN(chunk, BULK_READ_BUF_LEN);
 
         // load data into the buffer
         bulk->read(bulk, chunk, bulkread_buffer);
@@ -81,7 +81,7 @@ void bulkread_start(TinyFrame *tf, BulkRead *bulk)
         uint8_t buf[8];
         PayloadBuilder pb = pb_start(buf, 4, NULL);
         pb_u32(&pb, bulk->len);
-        pb_u32(&pb, BULKREAD_MAX_CHUNK);
+        pb_u32(&pb, BULK_READ_BUF_LEN);
 
         // We use userdata1 to hold a reference to the bulk transfer
         TF_Msg msg = {

framework/settings.c

@@ -223,6 +223,8 @@ static void ini_preamble(IniWriter *iw, const char *filename)
     iw_comment(iw, "Close the LOCK jumper to save them to Flash.");
 }
 
+extern osMutexId mutScratchBufferHandle;
+
 /**
  * Write system settings to INI (without section)
  */
@@ -230,8 +232,12 @@ void settings_build_units_ini(IniWriter *iw)
 {
     ini_preamble(iw, "UNITS.INI");
 
+    assert_param(osOK == osMutexWait(mutScratchBufferHandle, 5000));
+    {
         ureg_build_ini(iw);
     }
+    assert_param(osOK == osMutexRelease(mutScratchBufferHandle));
+}
 
 /**
  * Write system settings to INI (without section)

framework/unit.c

@@ -6,7 +6,7 @@
 #include "unit.h"
 #include "resources.h"
 
-char unit_tmp512[512];
+char unit_tmp512[UNIT_TMP_LEN];
 
 // Abort partly inited unit
 void clean_failed_unit(Unit *unit)

framework/unit.h

@@ -16,7 +16,7 @@
         return E_BAD_UNIT_TYPE; \
 } while (0)
 
-extern char unit_tmp512[512]; // temporary static buffer - not expected to be accessed asynchronously
+extern char unit_tmp512[UNIT_TMP_LEN]; // temporary static buffer - not expected to be accessed asynchronously
 // TODO add mutex?
 
 typedef struct unit Unit;

framework/unit_registry.c

@@ -431,8 +431,13 @@ uint32_t ureg_get_num_units(void)
     return (uint32_t) unit_count;
 }
 
+extern osMutexId mutScratchBufferHandle;
+
 /** Deliver message to it's destination unit */
 void ureg_deliver_unit_request(TF_Msg *msg)
+{
+    // we must claim the scratch buffer because it's used by many units internally
+    assert_param(osOK == osMutexWait(mutScratchBufferHandle, 5000));
     {
         PayloadParser pp = pp_start(msg->data, msg->len, NULL);
         uint8_t callsign = pp_u8(&pp);
@@ -444,7 +449,7 @@ void ureg_deliver_unit_request(TF_Msg *msg)
 
         if (callsign == 0 || !pp.ok) {
             com_respond_error(msg->frame_id, E_MALFORMED_COMMAND);
-        return;
+            goto quit;
         }
 
         UlistEntry *li = ulist_head;
@@ -457,10 +462,11 @@ void ureg_deliver_unit_request(TF_Msg *msg)
                 // error is expected to have already been reported.
                 if (rv == E_SUCCESS) {
                     if (confirmed) com_respond_ok(msg->frame_id);
-            } else {
+                }
+                else {
                     com_respond_error(msg->frame_id, rv);
                 }
-            return;
+                goto quit;
             }
             li = li->next;
         }
@@ -468,6 +474,9 @@ void ureg_deliver_unit_request(TF_Msg *msg)
         // Not found
         com_respond_error(msg->frame_id, E_NO_SUCH_UNIT);
     }
+    quit:
+    assert_param(osOK == osMutexRelease(mutScratchBufferHandle));
+}
 
 /** Send a response for a unit-list request */
 void ureg_report_active_units(TF_ID frame_id)

freertos.c

@@ -84,6 +84,9 @@ osStaticMutexDef_t mutTinyFrameTxControlBlock;
 osSemaphoreId semVcomTxReadyHandle;
 osStaticSemaphoreDef_t semVcomTxReadyControlBlock;
 
+osMutexId mutScratchBufferHandle;
+osStaticMutexDef_t mutScratchBufferControlBlock;
+
 /* USER CODE BEGIN Variables */
 
 /* USER CODE END Variables */
@@ -142,6 +145,9 @@ void MX_FREERTOS_Init(void) {
   osMutexStaticDef(mutTinyFrameTx, &mutTinyFrameTxControlBlock);
   mutTinyFrameTxHandle = osMutexCreate(osMutex(mutTinyFrameTx));
 
+  osMutexStaticDef(mutScratchBuffer, &mutScratchBufferControlBlock);
+  mutScratchBufferHandle = osMutexCreate(osMutex(mutScratchBuffer));
+
   /* USER CODE BEGIN RTOS_MUTEX */
   /* add mutexes, ... */
   /* USER CODE END RTOS_MUTEX */

platform/plat_compat.h

@@ -9,10 +9,11 @@
 
 // -------- Static buffers ---------
 #define TSK_STACK_MAIN      220 // USB / VFS task stack size
-#define TSK_STACK_MSG       200 // TF message handler task stack size
+#define TSK_STACK_MSG       220 // TF message handler task stack size
 #define TSK_STACK_JOBRUNNER 80 // Job runner task stack size
 
-#define BULKREAD_MAX_CHUNK  256 // Bulk read buffer
+#define BULK_READ_BUF_LEN 256   // Buffer for TF bulk reads
+#define UNIT_TMP_LEN      512   // Buffer for bulk read and varions internal unit operations
 
 #define FLASH_SAVE_BUF_LEN  256 // Static buffer for saving to flash
 

tasks/task_msg.c

@@ -26,6 +26,7 @@ void TaskMessaging(const void * argument)
         xQueueReceive(queRxDataHandle, &slot, osWaitForever);
         assert_param(slot.len>0 && slot.len<=64); // check the len is within bounds
 
+        // We need thr scratch buffer for many unit command handlers
         TF_Accept(comm, slot.data, slot.len);
 
 #if USE_STACK_MONITOR

units/digital_in/unit_din.c

@@ -210,7 +210,7 @@ static error_t DI_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, Pay
         case CMD_READ:;
             TRY(UU_DI_Read(unit, &packed));
 
-            PayloadBuilder pb = pb_start((uint8_t*)unit_tmp512, 64, NULL);
+            PayloadBuilder pb = pb_start((uint8_t*)unit_tmp512, UNIT_TMP_LEN, NULL);
             pb_u16(&pb, packed);
             com_respond_buf(frame_id, MSG_SUCCESS, (uint8_t *) unit_tmp512, pb_length(&pb));
             return E_SUCCESS;

units/i2c/unit_i2c.c

@@ -380,7 +380,7 @@ error_t UU_I2C_WriteReg(Unit *unit, uint16_t addr, uint8_t regnum, const uint8_t
     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, 512, NULL);
+    PayloadBuilder pb = pb_start((uint8_t*)unit_tmp512, UNIT_TMP_LEN, NULL);
     pb_u8(&pb, regnum);
     pb_buf(&pb, bytes, width);