Add license notice

This file was orignally added in v0.0.1, somehow messed up git history and it got deleted. This is a reupload

Core/Inc/main.h

@@ -45,8 +45,10 @@ extern "C" {
 
 /* Exported macro ------------------------------------------------------------*/
 /* USER CODE BEGIN EM */
-#define DEBUG
+//#define DEBUG_ITM
-#ifdef DEBUG
+//#define DEBUG_DUMMY_FRAME
+
+#ifdef DEBUG_ITM
 #include <stdio.h>
 #define DEBUG_PRINT(...) printf(__VA_ARGS__)
 #else

Core/Inc/stm32f4xx_it.h

@@ -52,6 +52,7 @@ void MemManage_Handler(void);
 void BusFault_Handler(void);
 void UsageFault_Handler(void);
 void DebugMon_Handler(void);
+void USART1_IRQHandler(void);
 void SDIO_IRQHandler(void);
 void TIM6_DAC_IRQHandler(void);
 void DMA2_Stream3_IRQHandler(void);

Core/Src/canlog.c

@@ -121,12 +121,14 @@ void vCANListener(void *argument)
 
   for (;;)
   {
-    if (osMessageQueueGet(queue, &message, NULL, osWaitForever) == osOK)
+    if (osMessageQueueGet(queue, &message, NULL, 1000) == osOK)
     {
           // J1939 decoding
 
       osMessageQueuePut(xUARTQueue, &message, 0U, 0U);
     }
+    else DEBUG_PRINT("No CAN yet!\r\n");
+
   }
 }
 /* END vCANListener */

Core/Src/cansend.c

@@ -104,24 +104,52 @@ void vUARTLogger(void *argument)
   CanMessage_t message;
   char tx_buffer[45];
 
+  #ifdef DEBUG_DUMMY_FRAME
+  CanMessage_t dummy_frame = {
+    .id = 0x0CF00400,       // J1939 EEC1 ID
+    .dlc = 8,               // 8 bytes of data
+    .isExtended = 1,        // 29-bit Extended ID
+    .source = 1,            // CAN1
+    .payload = {0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF, 0x11, 0x22}
+  };
+  #endif
+
   for (;;)
   {
     DEBUG_PRINT("Waiting for CAN traffic...\r\n");
-    if (osMessageQueueGet(xUARTQueue, &message, NULL, osWaitForever) == osOK)
-    {
-      osSemaphoreAcquire(xUARTDMASemaphore, osWaitForever);
-      int len = format_can_message(tx_buffer, message.source, &message);
 
-      if (HAL_UART_Transmit_DMA(&huart1, (uint8_t*)tx_buffer, len) == HAL_OK)
+    #ifdef DEBUG_DUMMY_FRAME
+    uint32_t queue_timeout = 1000U;
+    #else
+    uint32_t queue_timeout = osWaitForever;
+    #endif
+
+    #ifdef DEBUG_DUMMY_FRAME
+    osMessageQueuePut(xUARTQueue, &dummy_frame, 0U, 0U);
+    osDelay(1000);
+    #endif
+
+   	if (osMessageQueueGet(xUARTQueue, &message, NULL, queue_timeout) == osOK)
+	{
+      if (osSemaphoreAcquire(xUARTDMASemaphore, queue_timeout) == osOK)
       {
+        int len = format_can_message(tx_buffer, message.source, &message);
+
+        if (HAL_UART_Transmit_DMA(&huart1, (uint8_t*)tx_buffer, len) == HAL_OK)
+        {
           DEBUG_PRINT("CAN frame sent via UART\r\n");
+        }
+        else
+        {
+          osSemaphoreRelease(xUARTDMASemaphore);
+          DEBUG_PRINT("HAL error, CAN frame NOT sent!\r\n");
+        }
       }
       else
       {
-        osSemaphoreRelease(xUARTDMASemaphore);
+        DEBUG_PRINT("ERROR: Semaphore timeout! UART might be stuck in BUSY state.\r\n");
-        DEBUG_PRINT("HAL error, CAN frame NOT sent!\r\n");
       }
-    }
+	}
   }
 }
 /* END vUARTLoggerListen */

Core/Src/main.c

@@ -79,13 +79,7 @@ static void MX_USART1_UART_Init(void);
 /* USER CODE BEGIN PFP */
 int _write(int file, char *ptr, int len)
 {
-  if ((CoreDebug->DEMCR & CoreDebug_DEMCR_TRCENA_Msk) && (ITM->TCR & ITM_TCR_ITMENA_Msk))
+  for (int i = 0; i < len; i++) ITM_SendChar((*ptr++));
-  {
-    for (int i = 0; i < len; i++)
-    {
-      ITM_SendChar((*ptr++));
-    }
-  }
   return len;
 }
 /* USER CODE END PFP */
@@ -103,10 +97,14 @@ int main(void)
 {
 
   /* USER CODE BEGIN 1 */
-  CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
+  if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk)
-  ITM->LAR = 0xC5ACCE55;
+  {
-  ITM->TER = 1 << 0;
+    CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
-  ITM->TCR = ITM_TCR_ITMENA_Msk | ITM_TCR_SYNCENA_Msk | ITM_TCR_SWOENA_Msk;
+    ITM->LAR = 0xC5ACCE55;
+    ITM->TER = 1 << 0;
+    ITM->TCR = ITM_TCR_ITMENA_Msk | ITM_TCR_SYNCENA_Msk | ITM_TCR_SWOENA_Msk;
+  }
+
   DEBUG_PRINT("Booting system\r\n");
   /* USER CODE END 1 */
 

Core/Src/stm32f4xx_hal_msp.c

@@ -392,6 +392,9 @@ void HAL_UART_MspInit(UART_HandleTypeDef* huart)
 
     __HAL_LINKDMA(huart,hdmatx,hdma_usart1_tx);
 
+    /* USART1 interrupt Init */
+    HAL_NVIC_SetPriority(USART1_IRQn, 5, 0);
+    HAL_NVIC_EnableIRQ(USART1_IRQn);
     /* USER CODE BEGIN USART1_MspInit 1 */
 
     /* USER CODE END USART1_MspInit 1 */
@@ -424,6 +427,9 @@ void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
 
     /* USART1 DMA DeInit */
     HAL_DMA_DeInit(huart->hdmatx);
+
+    /* USART1 interrupt DeInit */
+    HAL_NVIC_DisableIRQ(USART1_IRQn);
     /* USER CODE BEGIN USART1_MspDeInit 1 */
 
     /* USER CODE END USART1_MspDeInit 1 */

Core/Src/stm32f4xx_it.c

@@ -59,6 +59,7 @@ extern DMA_HandleTypeDef hdma_sdio_rx;
 extern DMA_HandleTypeDef hdma_sdio_tx;
 extern SD_HandleTypeDef hsd;
 extern DMA_HandleTypeDef hdma_usart1_tx;
+extern UART_HandleTypeDef huart1;
 extern TIM_HandleTypeDef htim6;
 
 /* USER CODE BEGIN EV */
@@ -163,6 +164,20 @@ void DebugMon_Handler(void)
 /* please refer to the startup file (startup_stm32f4xx.s).                    */
 /******************************************************************************/
 
+/**
+  * @brief This function handles USART1 global interrupt.
+  */
+void USART1_IRQHandler(void)
+{
+  /* USER CODE BEGIN USART1_IRQn 0 */
+
+  /* USER CODE END USART1_IRQn 0 */
+  HAL_UART_IRQHandler(&huart1);
+  /* USER CODE BEGIN USART1_IRQn 1 */
+
+  /* USER CODE END USART1_IRQn 1 */
+}
+
 /**
   * @brief This function handles SDIO global interrupt.
   */

LICENSE.md

@@ -0,0 +1,38 @@
+GNU GENERAL PUBLIC LICENSE 
+Version 3, 29 June 2007
+
+Copyright (C) 2007 Free Software Foundation, Inc. https://fsf.org/ 
+Everyone is permitted to copy and distribute verbatim copies 
+of this license document, but changing it is not allowed.
+
+Preamble
+
+The GNU General Public License is a free, copyleft license for 
+software and other kinds of works.
+
+The licenses for most software and other practical works are designed 
+to take away your freedom to share and change the works. By contrast, 
+the GNU General Public License is intended to guarantee your freedom to 
+share and change all versions of a program--to make sure it remains free 
+software for all its users. We, the Free Software Foundation, use the 
+GNU General Public License for most of our software; it applies also to 
+any other work released this way by its authors. You can apply it to 
+your programs, too.
+
+When we speak of free software, we are referring to freedom, not 
+price. Our General Public Licenses are designed to make sure that you 
+have the freedom to distribute copies of free software (and charge for 
+them if you wish), that you receive source code or can get it if you 
+want it, that you can change the software or use pieces of it in new 
+free programs, and that you know you can do these things.
+
+To protect your rights, we need to prevent others from denying you 
+these rights or asking you to surrender the rights. Therefore, you have 
+certain responsibilities if you distribute copies of the software, or if 
+you modify it: responsibilities to respect the freedom of others.
+
+For example, if you distribute copies of such a program, whether 
+gratis or for a fee, you must pass on to the recipients the same 
+freedoms that you received. You must make sure that they, too, receive 
+or can get the source code. And you must show them these terms so they 
+know their rights.

NOTICE.md

@@ -0,0 +1,15 @@
+# Third-Party Notices
+
+This project is built with open source components and includes third-party software:
+
+## 1. Original Application Code
+- **Copyright (c) 2026 Erick Ahmed**
+- **License:** [GNU General Public License v3.0](https://git.erickahmed.com/erickahmed/j1939_logger/src/branch/main/LICENSE.md)
+
+## 2. STM32F4 HAL Drivers
+- **Copyright (c) 2016 STMicroelectronics**
+- **License:** [BSD 3-Clause License](https://git.erickahmed.com/erickahmed/j1939_logger/src/branch/main/Drivers/STM32F4xx_HAL_Driver/LICENSE.txt)
+
+## 3. STM32 CMSIS
+- **Copyright (c) 2017 STMicroelectronics**
+- **License:** [Apache License 2.0](https://git.erickahmed.com/erickahmed/j1939_logger/src/branch/main/Drivers/CMSIS/LICENSE.txt)

can_logger.ioc

@@ -124,6 +124,7 @@ NVIC.SysTick_IRQn=true\:15\:0\:false\:false\:false\:true\:false\:true\:false
 NVIC.TIM6_DAC_IRQn=true\:15\:0\:false\:false\:true\:false\:false\:true\:true
 NVIC.TimeBase=TIM6_DAC_IRQn
 NVIC.TimeBaseIP=TIM6
+NVIC.USART1_IRQn=true\:5\:0\:false\:false\:true\:true\:true\:true\:true
 NVIC.UsageFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false\:false
 PA10.Mode=Asynchronous
 PA10.Signal=USART1_RX