Acquire DMA semaphore before transmitting UART

Core/Src/canlog.c

@@ -129,6 +129,7 @@ void vCANListener(void *argument)
 
       osMessageQueuePut(xUARTQueue, &message, 0U, 0U);
     }
+    else DEBUG_PRINT("LALALLALA CIAOOOOOO c:\r\n");
   }
 }
 /* END vCANListener */

Core/Src/main.c

@@ -91,13 +91,18 @@ int _write(int file, char *ptr, int len)
 #include <stdio.h>
 #include <stdarg.h>
 
+extern osSemaphoreId_t xUARTDMASemaphore;
 extern osMutexId_t debugPrintMutex;
 
 void uart_debug_print(const char *fmt, ...)
 {
   if (huart1.gState == HAL_UART_STATE_RESET) return;
 
-  if (osKernelGetState() == osKernelRunning) osMutexAcquire(debugPrintMutex, osWaitForever);
+  if (osKernelGetState() == osKernelRunning)
+  {
+    osMutexAcquire(debugPrintMutex, osWaitForever);
+    osSemaphoreAcquire(xUARTDMASemaphore, osWaitForever);
+  }
 
   char buf[128];
   va_list args;
@@ -106,13 +111,13 @@ void uart_debug_print(const char *fmt, ...)
   int len = vsnprintf(buf, sizeof(buf), fmt, args);
   va_end(args);
 
-  if (len > 0)
+  if (len > 0) HAL_UART_Transmit(&huart1, (uint8_t*)buf, len, 100);
-  {
-    while (huart1.gState != HAL_UART_STATE_READY);
-    HAL_UART_Transmit(&huart1, (uint8_t*)buf, len, 100);
-  }
 
-  if (osKernelGetState() == osKernelRunning) osMutexRelease(debugPrintMutex);
+  if (osKernelGetState() == osKernelRunning)
+  {
+    osSemaphoreRelease(xUARTDMASemaphore);
+    osMutexRelease(debugPrintMutex);
+  }
 }
 #endif
 /* USER CODE END PF */