I made a simple connection like in the figure. The processor's Tx pin is connected to the Rx pin. When I look through the oscilloscope, I can see the data flowing.
When I debug code :
It goes to the error code in the picture during tx.
Code:
CAN_FilterTypeDef sFilterConfig;
CAN_TxHeaderTypeDef TxHeader;
CAN_RxHeaderTypeDef RxHeader;
uint8_t TxData[8];
uint8_t RxData[8];
uint32_t TxMailbox;
void HAL_CAN_TxMailbox0CompleteCallback(CAN_HandleTypeDef *hcan)
{
__nop();
__nop();
__nop();
__nop();
__nop();
}
void HAL_CAN_RxFifo0MsgPendingCallback(CAN_HandleTypeDef *hcan)
{
HAL_CAN_GetRxMessage(&hcan1, CAN_RX_FIFO0, &RxHeader, RxData);
__nop();
__nop();
__nop();
__nop();
__nop();
}
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_CAN_Init();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
/* Configure Transmission process */
sFilterConfig.FilterBank = 0;
sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
sFilterConfig.FilterIdHigh = 0x0000;
sFilterConfig.FilterIdLow = 0x0000;
sFilterConfig.FilterMaskIdHigh = 0x0000;
sFilterConfig.FilterMaskIdLow = 0x0000;
sFilterConfig.FilterFIFOAssignment = CAN_RX_FIFO0;
sFilterConfig.FilterActivation = ENABLE;
sFilterConfig.SlaveStartFilterBank = 14;
if (HAL_CAN_ConfigFilter(&hcan1, &sFilterConfig) != HAL_OK)
{
/* Filter configuration Error */
Error_Handler();
}
if (HAL_CAN_Start(&hcan1) != HAL_OK)
{
/* Start Error */
Error_Handler();
}
if (HAL_CAN_ActivateNotification(&hcan1, CAN_IT_RX_FIFO0_FULL) != HAL_OK)
{
/* Notification Error */
Error_Handler();
}
TxHeader.StdId = 0x01;
TxHeader.ExtId = 0x01;
TxHeader.RTR = CAN_RTR_DATA;
TxHeader.IDE = CAN_ID_STD;
TxHeader.DLC = 8;
TxHeader.TransmitGlobalTime = DISABLE;
TxData[0] = 1;
TxData[1] = 2;
TxData[2] = 3;
TxData[3] = 4;
TxData[4] = 5;
TxData[5] = 6;
TxData[6] = 7;
TxData[7] = 8;
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_CAN_AddTxMessage(&hcan1, &TxHeader, TxData, &TxMailbox);
HAL_Delay(500);
TxData[7] = TxData[7] + 1;
}
/* USER CODE END 3 */
}
static void MX_CAN_Init(void)
{
/* USER CODE BEGIN CAN_Init 0 */
/* USER CODE END CAN_Init 0 */
/* USER CODE BEGIN CAN_Init 1 */
/* USER CODE END CAN_Init 1 */
hcan1.Instance = CAN1;
hcan1.Init.Prescaler = 12;
hcan1.Init.Mode = CAN_MODE_NORMAL;
hcan1.Init.SyncJumpWidth = CAN_SJW_1TQ;
hcan1.Init.TimeSeg1 = CAN_BS1_13TQ;
hcan1.Init.TimeSeg2 = CAN_BS2_2TQ;
hcan1.Init.TimeTriggeredMode = DISABLE;
hcan1.Init.AutoBusOff = DISABLE;
hcan1.Init.AutoWakeUp = DISABLE;
hcan1.Init.AutoRetransmission = DISABLE;
hcan1.Init.ReceiveFifoLocked = DISABLE;
hcan1.Init.TransmitFifoPriority = DISABLE;
if (HAL_CAN_Init(&hcan1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN CAN_Init 2 */
/* USER CODE END CAN_Init 2 */
}
The code does not go to the functions "USB_LP_CAN1_RX0_IRQHandler" and "HAL_CAN_RxFifo0MsgPendingCallback". Where am I making a mistake?
