FDCAN2 Rx callback doesn't work STM32H753

[julred]

Dear all,

I'm struggeling to get FDCAN2 working on my board. I also use FDCAN1 - which is working pretty good.
For FDCAN1 I selected the RxFifo0 and for FDCAN2 I selected RxFifo1.

But for some reasons, I dont get the callback for HAL_FDCAN_RxFifo1Callback().

Thats part of my own code, where I used the _weak function HAL_FDCAN_RxFifo1Callback(

// CAN 2 receive interrupt callback
void HAL_FDCAN_RxFifo1Callback(FDCAN_HandleTypeDef *hfdcan, uint32_t RxFifo1ITs)
{

//....

// the incoming message will be used for further scenarios

//...

}

I can also see that the interrupt function will not be called for FDCAN2 if I put a breakpoint into this section (FDCAN1 is working as mentioned)

void FDCAN2_IT1_IRQHandler(void)
{
  /* USER CODE BEGIN FDCAN2_IT1_IRQn 0 */

  /* USER CODE END FDCAN2_IT1_IRQn 0 */
  HAL_FDCAN_IRQHandler(&hfdcan2);
  /* USER CODE BEGIN FDCAN2_IT1_IRQn 1 */

  /* USER CODE END FDCAN2_IT1_IRQn 1 */
}

I also added my .ioc file - much appreciate if you can have a look into this, due I'm running out of ideas how to go ahead.

[SofLit]

Hello,

It could be many reasons: interrupt not enabled, Filter not configured correctly, not the correct Rx pin used.. etc ..

I invite you to inspire from this example: https://github.com/STMicroelectronics/STM32CubeH7/tree/master/Projects/STM32H743I-EVAL/Examples/FDCAN/FDCAN_Com_IT

But first, try loopback mode: https://github.com/STMicroelectronics/STM32CubeH7/tree/master/Projects/STM32H743I-EVAL/Examples/FDCAN/FDCAN_Loopback

Hope it helps.

[julred]

If I configure FDCAN on RxFifo0, then everything is working. So pinsetting etc. is fine.

I will check-out your posted links. Do you have time to investigate into attached ioc file?

[SofLit]

According to your ioc file, I noticed that you didn't set any of Std/Ext filter numbers. I think you need to set at least one filter for each if you are receiving both types of frames:

  hfdcan.Init.StdFiltersNbr = 1;
  hfdcan.Init.ExtFiltersNbr = 1;

[Jacob WOODRUFF]

Hi All,

This post has been escalated to the ST Online Support Team for additional assistance. We'll contact you directly.

Regards,
Jake

ST Support

[julred]

Any updates so far?

[SofLit]

Did you check my last comment?

[julred]

The provided solution will not fix my problem.

To get a little bit more clarity:

My desired configuration:

CAN1 -> RxFifo0

CAN2 -> RxFiFo1

But in this config I will not get any messages for CAN2 in HAL_FDCAN_RxFifo1Callback.

But I will get messages for CAN1 in HAL_FDCAN_RxFifo0Callback

In this config I got IRQ on FDCAN1_IT0_IRQHandler, but no on FDCAN2_IT0_IRQHandler

I tested for both CAN busses the std and ext. filter configuration, which was not working.

I exchanged the configuration:

CAN1-> RxFifo1

CAN2->RxFifo0

I just got messages in RxFifo0. That means from HW side everything looks good, but this issue seems to be a software related one, since RxFifo1 is without any function.

Also in this config I got IRQ on FDCAN2_IT0_IRQHandler, but no on FDCAN1_IT0_IRQHandler

Since I'm running my code on a custom board with STMH753XI - I'm not able to test in an easy way the loopback or other provided examples. Any recommondation, hints are welcome.

[julred · Accepted solution]

I just got the message from ST - Support.

It is now working after implementing the following function call:

HAL_FDCAN_ConfigGlobalFilter(&hfdcan2, FDCAN_ACCEPT_IN_RX_FIFO1, FDCAN_ACCEPT_IN_RX_FIFO1, FDCAN_FILTER_REMOTE, FDCAN_FILTER_REMOTE); 

[SofLit]

But, previously, you said "If I configure FDCAN on RxFifo0, then everything is working"

Did you enable that line for FIFO0?