CAN Rx interrupt not generating on STM32f103c8t6(STM32 BLUEPILL)

[Suryaprakash2002]

I have stm32 bluepilll on which I am able to transmit CAN messages but CAN Receive interrupt is not generating.

I found while configuring that CAN RX pin(GPIO mode) is getting configured as Input mode. How accurate is this?

I  think it should be Alternate function. I made PB8 as Alternate function still CAN Rx interrupt is not working.

Above statements are under stm32f1xx_hal_msp.c

I am using CAN RX1 interrupt, following are  my configurations

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 */

hcan.Instance = CAN1;

hcan.Init.Prescaler = 9;

hcan.Init.Mode = CAN_MODE_NORMAL;

hcan.Init.SyncJumpWidth = CAN_SJW_1TQ;

hcan.Init.TimeSeg1 = CAN_BS1_3TQ;

hcan.Init.TimeSeg2 = CAN_BS2_4TQ;

hcan.Init.TimeTriggeredMode = DISABLE;

hcan.Init.AutoBusOff = ENABLE;

hcan.Init.AutoWakeUp = DISABLE;

hcan.Init.AutoRetransmission = ENABLE;

hcan.Init.ReceiveFifoLocked = DISABLE;

hcan.Init.TransmitFifoPriority = DISABLE;

if (HAL_CAN_Init(&hcan) != HAL_OK)

{

Error_Handler();

}

/* USER CODE BEGIN CAN_Init 2 */

CAN_FilterTypeDef canfilterconfig;

canfilterconfig.FilterActivation = CAN_FILTER_ENABLE;

canfilterconfig.FilterBank = 18; // which filter bank to use from the assigned ones PA11

canfilterconfig.FilterFIFOAssignment = CAN_FILTER_FIFO1;

canfilterconfig.FilterIdHigh = 0x00000103<<5;

canfilterconfig.FilterIdLow = 0;

canfilterconfig.FilterMaskIdHigh = 0x00000103<<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(&hcan, &canfilterconfig);

if (HAL_CAN_Start(&hcan)!= HAL_OK)

{

Error_Handler();

}

HAL_CAN_ActivateNotification(&hcan,CAN_IT_RX_FIFO1_MSG_PENDING);

/* USER CODE END CAN_Init 2 */

}

void HAL_CAN_RxFifo1MsgPendingCallback(CAN_HandleTypeDef *hcan)

{

HAL_CAN_GetRxMessage(hcan, CAN_RX_FIFO1, &RxHeader, RxData);

if (RxHeader.StdId == 0x0000103)

{

rx=1;

}

}

[SRedd.5]

__weak void HAL_CAN_RxFifo0FullCallback(CAN_HandleTypeDef *hcan)
{
/* Prevent unused argument(s) compilation warning */
UNUSED(hcan);

/* NOTE : This function Should not be modified, when the callback is needed,
the HAL_CAN_RxFifo0FullCallback could be implemented in the user
file
*/
}

Why can't you use this function for receive message? I generated the project using your micro part number.

[Jannaros]

Hello, i have the same configuration Suryaprakash2002. CAN RX does not trigger also for me. I do not know what to do. CAN TX transmit well, CAN RX does not trigger. The scope shows the recieved CAN at the CAN_RX PA8 PIN. What i noticed is that after a can message received the CAN TX pin PA9 goes for some bits(2 or 3) low and then high again. 

Any ideas?

Best regards

[Jannaros]

CAN RX1 interrupt it does not work. You do not have to change the filters.

I found an alternative solution for not triggering the interrupt:

At CubeMX go at Connectivity->CAN->Configuration->NVIC->

 -USB low priority or CAN RX0 interrupt  (activate)

 -CAN RX1 interrupt  (deactivate)

Then the CAN communications works well.