Please advise on handling FDCAN Rxfifo.

[taeun]

I am trying to receive CAN FD and save the data to the SD card, but I am having a problem .

Create and deliver an event structure in HAL_FDCAN_RXFifo0Callback, Receive the structure from the application area and call HAL_FDCAN_GetRxmessage. In this case , RxFIFOFULL accur .

IF HAL_FDCAN_GetRxmessage is called from callback, RXFIFOFULL does not occur. 

However i want to keep the callback statement as short as possible , Also idon't understand why tihs is a problem in the first case.

The place where HAL_FDCAN_GetRxMessage is called is cantoQueue(). 

There is no problem if place this function in  callback rather than app()

.

[SofLit]

Hello,

Sorry I didn't understand the case. 

Do you mean if you call HAL_FDCAN_GetRxmessage() inside the HAL_FDCAN_RXFifo0Callback() callback the calback doesn't fiire while if you remove HAL_FDCAN_GetRxmessage() call the callback is called?

[taeun]

When HAL_FDCAN_GetRxmessage is called in app(), RXfifoFULL occurs and CAN messages can no longer be received or the messages are lost.

[SofLit]

RXfifoFULL when HAL_FDCAN_GetRxmessage() called?? are you sure it's called?

I think better to forget about SD card function for now and try with a simple CAN receiving project. 

[Karl Yamashita]

Skip using memcpy and just have HAL do all the work for you and save the data directly to your queue. When you get return status HAL_OK, then increment your queue pointer so the next CAN message is save in the next queue.

if (HAL_FDCAN_GetRxMessage(&hfdcan1, FDCAN_RX_FIFO0, &rxHeader, rxQueue[rxQueueHead]) == HAL_OK)