Hi,
I am working on CAN on STM32F103C8T6.
I am using a Callback Function of (HAL_CAN_RxFifo0MsgPendingCallback) but soon after receiving message code hangs in Callback Function even though no data sent afterwards it.
I am not getting the reason. Because this function works fine on CORTEX-M4 pocessor.
However, Transmit_Interrupt is working fine. But receive interrupt is hanging.
Here, is the code Snippet.
Code is getting stuck in the receiver callback function (HAL_CAN_RxFifo0MsgPendingCallback).
/* INTERRUPT HANG IN RECEIVER ISR FUNCTION */
void HAL_CAN_RxFifo0MsgPendingCallback (CAN_HandleTypeDef *hcan) {
CAN_RxHeaderTypeDef RxHeader;
uint8_t rcvd_msg[5];
char msg[50];
if(HAL_CAN_GetRxMessage((CAN_HandleTypeDef*)&hcan,CAN_RX_FIFO0,&RxHeader,rcvd_msg) != HAL_OK)
{
Error_Handler();
}
sprintf(msg,"Message Received : %s\n",rcvd_msg);
HAL_UART_Transmit(&huart1,(uint8_t*)msg,strlen(msg),10);
}
Guys, please help.
Thanks,
Alankrit
There are 2 interesting things happening :
#1 : Without enabling CAN_Transmit_IT , HAL_CAN_TxMailbox0CompleteCallback() function gets called.
#2 : And then, code gets stuck in the (HAL_CAN_RxFifo0MsgPendingCallback) function even if I am not transmitting in callback function and clearing the buffer.
I am pretty sure, it is not a programming bug. There may be 2 areas of bug :
- Wrong CAN_settings.
- May be some issue with library.
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_CAN_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
CAN_Filter_Config();
if(HAL_CAN_ActivateNotification(&hcan,CAN_IT_TX_MAILBOX_EMPTY | CAN_IT_RX_FIFO0_MSG_PENDING |CAN_IT_BUSOFF) != HAL_OK)
{
Error_Handler();
}
if (HAL_CAN_Start(&hcan) != HAL_OK) {
Error_Handler();
}
CAN_TX();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
if (rx_flag > 0) {
rx_flag = 0;
HAL_UART_Transmit(&huart1,(uint8_t*)msg,strlen(msg),10);
HAL_UART_Transmit(&huart1,(uint8_t*)msg,sprintf(msg,"HI\n"),10);
/* NOT WORKING*/
}
}
======================================================================
/* USER CODE BEGIN 4 */
void HAL_CAN_TxMailbox0CompleteCallback(CAN_HandleTypeDef *hcan) {
HAL_UART_Transmit(&huart1,(uint8_t*)buffer,sprintf(buffer,"MESSAGE SENT : MAILBOX_0...\n"),10);
}
void HAL_CAN_TxMailbox1CompleteCallback(CAN_HandleTypeDef *hcan) {
HAL_UART_Transmit(&huart1,(uint8_t*)buffer,sprintf(buffer,"MESSAGE SENT : MAILBOX_1...\n"),10);
}
void HAL_CAN_TxMailbox2CompleteCallback(CAN_HandleTypeDef *hcan) {
HAL_UART_Transmit(&huart1,(uint8_t*)buffer,sprintf(buffer,"MESSAGE SENT : MAILBOX_2...\n"),10);
}
/* INTERRUPT HANG IN RECEIVER ISR FUNCTION */
void HAL_CAN_RxFifo0MsgPendingCallback (CAN_HandleTypeDef *hcan) {
CAN_RxHeaderTypeDef RxHeader;
uint8_t rcvd_msg[10];
/* INTERRUPT HANGING */
// if (HAL_CAN_GetRxMessage((CAN_HandleTypeDef*)&hcan,CAN_RX_FIFO0,&RxHeader,rcvd_msg) != HAL_OK) {
// Error_Handler();
// }
HAL_CAN_GetRxMessage((CAN_HandleTypeDef*)&hcan,CAN_RX_FIFO0,&RxHeader,rcvd_msg);
sprintf(msg, "FUNCTION_RETURN_VALUE : %s\n", rcvd_msg);
memset(rcvd_msg, 0, sizeof(rcvd_msg));
rx_flag = 1; /* Raise the flag */
/* Control never gets into the while loop as there is incessant CAN_Receive_Interrupts */
}
/* USER CODE END 4 */
I am attaching my source code in attachment. Please go through it.
Please give your valuable feedback.
Regards,
Alankrit
