The problem that I am facing with the CAN communication using STM32F412G-DISCO is that the CAN transmission from the STM32F412G-DISCO devboard is working fine, but the mcu is not receiving any data on the CAN bus. I am using a CAN analyser to send the data. I can confirm the analyser is properly sending the data since another mcu is receiving the data sent from my CAN analyser properly.
I have attached the code snippets am using to run the CAN RX and TX for review if anyone could let me know whether there is an issue in the code/configuration, or is it a problem of the device itself?
I am using the CAN2 peripheral and the application is running RTOS. The Baud of the CAN is 500Kbps.
/* Private variables ---------------------------------------------------------*/
CAN_HandleTypeDef hcan2;
/* USER CODE BEGIN 0 */
CAN_TxHeaderTypeDef TxHeader;
CAN_RxHeaderTypeDef RxHeader;
uint8_t TxData[8];
uint32_t TxMailbox;
uint8_t RxData[8];
void HAL_CAN_RxFifo1MsgPendingCallback(CAN_HandleTypeDef *hcan) {
if (HAL_CAN_GetRxMessage(&hcan2, CAN_RX_FIFO1, &RxHeader, RxData)
!= HAL_OK) {
Error_Handler();
}
datacheck = 1;
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void) {
/*Existing Code …*/
MX_CAN2_Init();
CAN_FilterTypeDef canfilterconfig;
canfilterconfig.FilterActivation = CAN_FILTER_ENABLE;
canfilterconfig.FilterBank = 18; // which filter bank to use from the assigned ones
canfilterconfig.FilterFIFOAssignment = CAN_FILTER_FIFO0;
canfilterconfig.FilterIdHigh = 0x446 << 5;
canfilterconfig.FilterIdLow = 0;
canfilterconfig.FilterMaskIdHigh = 0x446 << 5;
canfilterconfig.FilterMaskIdLow = 0x0000;
canfilterconfig.FilterMode = CAN_FILTERMODE_IDMASK;
canfilterconfig.FilterScale = CAN_FILTERSCALE_32BIT;
canfilterconfig.SlaveStartFilterBank = 20; // how many filters to assign to the CAN1 (master can)
HAL_CAN_ConfigFilter(&hcan2, &canfilterconfig);
if (HAL_CAN_ActivateNotification(&hcan2, CAN_IT_RX_FIFO1_MSG_PENDING)
!= HAL_OK) {
Error_Handler();
}
HAL_CAN_Start(&hcan2);
}
/**
* @brief CAN2 Initialization Function
* @PAram None
* @retval None
*/
static void MX_CAN2_Init(void) {
/* USER CODE BEGIN CAN2_Init 0 */
/* USER CODE END CAN2_Init 0 */
/* USER CODE BEGIN CAN2_Init 1 */
/* USER CODE END CAN2_Init 1 */
hcan2.Instance = CAN2;
hcan2.Init.Prescaler = 18;
hcan2.Init.Mode = CAN_MODE_NORMAL;
hcan2.Init.SyncJumpWidth = CAN_SJW_1TQ;
hcan2.Init.TimeSeg1 = CAN_BS1_2TQ;
hcan2.Init.TimeSeg2 = CAN_BS2_1TQ;
hcan2.Init.TimeTriggeredMode = DISABLE;
hcan2.Init.AutoBusOff = DISABLE;
hcan2.Init.AutoWakeUp = DISABLE;
hcan2.Init.AutoRetransmission = DISABLE;
hcan2.Init.ReceiveFifoLocked = ENABLE;
hcan2.Init.TransmitFifoPriority = DISABLE;
if (HAL_CAN_Init(&hcan2) != HAL_OK) {
Error_Handler();
}
/* USER CODE BEGIN CAN2_Init 2 */
/* USER CODE END CAN2_Init 2 */
}
I was checking the ‘datacheck’ variable but it always stays at 0. I have also tried putting a breakpoint in the callback, the control never hits the breakpoint. Which I am suspecting the callback never gets fired. I have tried without keeping the filter config, still no data received.
