Posted on December 22, 2015 at 10:47Hello!
I have already coded for CAN Loopback mode and it works.
However, when I changed the mode to CAN Normal Mode, I am unable to hit Receive Handler, but I can hit transmit Handler.
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();
/* Configure the system clock */
SystemClock_Config();
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_CAN_Init();
CanTxMsgTypeDef TxMsg = {
.StdId = 0x321,
.ExtId = 0x01,
.IDE = CAN_ID_STD,
.RTR = CAN_RTR_DATA,
.DLC = 1,
};
CanRxMsgTypeDef RxMsg;
hcan.pTxMsg = &TxMsg;
hcan.pRxMsg = &RxMsg;
CAN_FilterConfTypeDef CAN_FilterConfig = {
.BankNumber = 0,
.FilterActivation = ENABLE,
.FilterScale = CAN_FILTERSCALE_16BIT,
.FilterMode = CAN_FILTERMODE_IDMASK,
.FilterNumber = 0,
.FilterFIFOAssignment = 0,
.FilterMaskIdLow = (0x7FF << 5),
.FilterMaskIdHigh = (0x400 << 5),
.FilterIdLow = (CAN_ID << 5),
.FilterIdHigh = (2047 << 5),
};
HAL_CAN_ConfigFilter(&hcan, &CAN_FilterConfig);
HAL_CAN_Receive_IT(&hcan, CAN_FIFO0);
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_9, GPIO_PIN_RESET); //CAN initialisation over
hcan.pTxMsg->Data[0]++;
HAL_CAN_Transmit_IT(&hcan); //transmit interrupt hits after this
HAL_Delay(10);
uint32_t i = 0;
while((i < 0xFFF))
{
i++;
}
while (1)
{
}
}
void USB_LP_CAN_RX0_IRQHandler(void)
{
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_9, GPIO_PIN_RESET);
HAL_CAN_IRQHandler(&hcan);
}
void USB_HP_CAN_TX_IRQHandler(void)
{
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_9, GPIO_PIN_RESET);
HAL_CAN_IRQHandler(&hcan);
}
void HAL_CAN_TxCpltCallback(CAN_HandleTypeDef* hcan)
{
uint32_t timeout = 500;
HAL_StatusTypeDef status;
status = HAL_CAN_Receive_IT(hcan, CAN_FIFO0);
if(HAL_OK != status){
while(1);
}
}
I have also put the following in HAL_CAN_MspInit function:
HAL_NVIC_SetPriority(USB_LP_CAN_RX0_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(USB_LP_CAN_RX0_IRQn);
HAL_NVIC_SetPriority(USB_HP_CAN_TX_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(USB_HP_CAN_TX_IRQn);
Is it a sequencing issue? I am not sure why receive handler is not getting it (i.e. USB_LP_CAN_RX0_IRQHandler cannot be hit). Please help! Any help is appreciated! Thank you!
#can #stmf303 #can-normal-mode
