How to send data via CANFD from stm32H753AI to PC?

[PHumm.1]

Hello,

i am pretty new to this topic. I want to send simple data via CANFD from the stm32H/53AI to a PC. For that i have the CANFD-USB adapter from PEAK and to display the data i am using PCAN-View. I discovered the function and i put in the addresses to the fdcan and header initialization and the data i want to send: HAL_FDCAN_AddMessageT oTxFifoQ(&hfdcan1, &TxHeader, TxData)

  hfdcan1.Instance = FDCAN1;
  hfdcan1.Init.FrameFormat = FDCAN_FRAME_FD_BRS;
  hfdcan1.Init.Mode = FDCAN_MODE_NORMAL;
  hfdcan1.Init.AutoRetransmission = ENABLE;
  hfdcan1.Init.TransmitPause = DISABLE;
  hfdcan1.Init.ProtocolException = DISABLE;
  hfdcan1.Init.NominalPrescaler = 0x1;
  hfdcan1.Init.NominalSyncJumpWidth = 0x10;
  hfdcan1.Init.NominalTimeSeg1 = 0x3F;
  hfdcan1.Init.NominalTimeSeg2 = 0x10;
  hfdcan1.Init.DataPrescaler = 0x1;
  hfdcan1.Init.DataSyncJumpWidth = 0x04;
  hfdcan1.Init.DataTimeSeg1 = 0xF;
  hfdcan1.Init.DataTimeSeg2 = 0x4;
  hfdcan1.Init.MessageRAMOffset = 0;
  hfdcan1.Init.StdFiltersNbr = 1;
  hfdcan1.Init.ExtFiltersNbr = 0;
  hfdcan1.Init.RxFifo0ElmtsNbr = 0;
  hfdcan1.Init.RxFifo0ElmtSize = FDCAN_DATA_BYTES_12;
  hfdcan1.Init.RxFifo1ElmtsNbr = 0;
  hfdcan1.Init.RxFifo1ElmtSize = FDCAN_DATA_BYTES_12;
  hfdcan1.Init.RxBuffersNbr = 0;
  hfdcan1.Init.RxBufferSize = FDCAN_DATA_BYTES_12;
  hfdcan1.Init.TxEventsNbr = 32;
  hfdcan1.Init.TxBuffersNbr = 32;
  hfdcan1.Init.TxFifoQueueElmtsNbr = 32;
  hfdcan1.Init.TxFifoQueueMode = FDCAN_TX_FIFO_OPERATION;
  hfdcan1.Init.TxElmtSize = FDCAN_DATA_BYTES_64;

static void HEADER_Init(void){
  TxHeader.Identifier = 0x111;
  TxHeader.IdType = FDCAN_STANDARD_ID;
  TxHeader.TxFrameType = FDCAN_DATA_FRAME;
  TxHeader.DataLength = FDCAN_DLC_BYTES_12;
  TxHeader.ErrorStateIndicator = FDCAN_ESI_ACTIVE;
  TxHeader.BitRateSwitch = FDCAN_BRS_ON;
  TxHeader.FDFormat = FDCAN_FD_CAN;
  TxHeader.TxEventFifoControl = FDCAN_NO_TX_EVENTS;
  TxHeader.MessageMarker = 0;
}

That's the config in the PCAN-View:

 

But when i start the program PCAN-View doesn't receive the message/data . Does anyone has a clue what i am doing wrong?

There is less information about this on the internet therefore i am asking this here...

Thanks!

[SofLit]

Hello,

First, you have to check your bitrate config: Nominal & data:

 

STM32

[TOlli]

Hi @Community member​ 

Try changing these two lines:

hfdcan1.Init.TxEventsNbr = 32;

hfdcan1.Init.TxBuffersNbr = 32;

to

hfdcan1.Init.TxEventsNbr = 0;

hfdcan1.Init.TxBuffersNbr = 0;

You might be crashing your tx because you allocate too many elements of different kinds. And you get rid of these since you are using FIFO.

Other than that, if you have retransmission on, it might be good to have transmit pause on as well.

If the above is not correct, please give more input on your clocks so your prescales and bit timing can be reviewed.

Best regards,

Tero