STM32H743 Nucleo144 seems unable to transmit via FDCAN2?

[BSpri.1]

I am trrying to send messages via the second fdcan in classic can format. I am watching the bus with CANoe, but only FDCAN1 (classic master) seems to be able to transmit. If I try to transmit with FDCAN2 (classic slave) my buffer fills up but nothing is send.

I know it's not a hardware problem because I switched the board and my cables.

Here is my code:

The Init-Functions:

FDCAN_HandleTypeDef hfdcan1;
FDCAN_HandleTypeDef hfdcan2;
 
/* FDCAN1 init function */
void MX_FDCAN1_Init(void)
{
 
  hfdcan1.Instance = FDCAN1;
  hfdcan1.Init.FrameFormat = FDCAN_FRAME_CLASSIC;
  hfdcan1.Init.Mode = FDCAN_MODE_NORMAL;
  hfdcan1.Init.AutoRetransmission = DISABLE;
  hfdcan1.Init.TransmitPause = DISABLE;
  hfdcan1.Init.NominalPrescaler = 5;
  hfdcan1.Init.NominalSyncJumpWidth = 1;
  hfdcan1.Init.NominalTimeSeg1 = 11;
  hfdcan1.Init.NominalTimeSeg2 = 4;
  hfdcan1.Init.DataPrescaler = 1;
  hfdcan1.Init.DataSyncJumpWidth = 1;
  hfdcan1.Init.DataTimeSeg1 = 1;
  hfdcan1.Init.DataTimeSeg2 = 1;
  hfdcan1.Init.MessageRAMOffset = 0;
  hfdcan1.Init.StdFiltersNbr = 0;
  hfdcan1.Init.ExtFiltersNbr = 0;
  hfdcan1.Init.RxFifo0ElmtsNbr = 8;
  hfdcan1.Init.RxFifo0ElmtSize = FDCAN_DATA_BYTES_8;
  hfdcan1.Init.RxFifo1ElmtsNbr = 0;
  hfdcan1.Init.RxFifo1ElmtSize = FDCAN_DATA_BYTES_8;
  hfdcan1.Init.RxBuffersNbr = 0;
  hfdcan1.Init.RxBufferSize = FDCAN_DATA_BYTES_8;
  hfdcan1.Init.TxEventsNbr = 0;
  hfdcan1.Init.TxBuffersNbr = 0;
  hfdcan1.Init.TxFifoQueueElmtsNbr = 8;
  hfdcan1.Init.TxFifoQueueMode = FDCAN_TX_FIFO_OPERATION;
  hfdcan1.Init.TxElmtSize = FDCAN_DATA_BYTES_8;
  hfdcan1.msgRam.StandardFilterSA = 0;
  hfdcan1.msgRam.ExtendedFilterSA = 0;
  hfdcan1.msgRam.RxFIFO0SA = 0;
  hfdcan1.msgRam.RxFIFO1SA = 0;
  hfdcan1.msgRam.RxBufferSA = 0;
  hfdcan1.msgRam.TxEventFIFOSA = 0;
  hfdcan1.msgRam.TxBufferSA = 0;
  hfdcan1.msgRam.TxFIFOQSA = 0;
  hfdcan1.msgRam.TTMemorySA = 0;
  hfdcan1.msgRam.EndAddress = 0;
  hfdcan1.ErrorCode = 0;
  if (HAL_FDCAN_Init(&hfdcan1) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
}
/* FDCAN2 init function */
void MX_FDCAN2_Init(void)
{
 
  hfdcan2.Instance = FDCAN2;
  hfdcan2.Init.FrameFormat = FDCAN_FRAME_CLASSIC;
  hfdcan2.Init.Mode = FDCAN_MODE_NORMAL;
  hfdcan2.Init.AutoRetransmission = DISABLE;
  hfdcan2.Init.TransmitPause = DISABLE;
  hfdcan2.Init.NominalPrescaler = 5;
  hfdcan2.Init.NominalSyncJumpWidth = 1;
  hfdcan2.Init.NominalTimeSeg1 = 11;
  hfdcan2.Init.NominalTimeSeg2 = 4;
  hfdcan2.Init.DataPrescaler = 1;
  hfdcan2.Init.DataSyncJumpWidth = 1;
  hfdcan2.Init.DataTimeSeg1 = 1;
  hfdcan2.Init.DataTimeSeg2 = 1;
  hfdcan2.Init.MessageRAMOffset = 0;
  hfdcan2.Init.StdFiltersNbr = 0;
  hfdcan2.Init.ExtFiltersNbr = 0;
  hfdcan2.Init.RxFifo0ElmtsNbr = 8;
  hfdcan2.Init.RxFifo0ElmtSize = FDCAN_DATA_BYTES_8;
  hfdcan2.Init.RxFifo1ElmtsNbr = 0;
  hfdcan2.Init.RxFifo1ElmtSize = FDCAN_DATA_BYTES_8;
  hfdcan2.Init.RxBuffersNbr = 0;
  hfdcan2.Init.RxBufferSize = FDCAN_DATA_BYTES_8;
  hfdcan2.Init.TxEventsNbr = 0;
  hfdcan2.Init.TxBuffersNbr = 0;
  hfdcan2.Init.TxFifoQueueElmtsNbr = 16;
  hfdcan2.Init.TxFifoQueueMode = FDCAN_TX_FIFO_OPERATION;
  hfdcan2.Init.TxElmtSize = FDCAN_DATA_BYTES_8;
  hfdcan2.msgRam.StandardFilterSA = 0;
  hfdcan2.msgRam.ExtendedFilterSA = 0;
  hfdcan2.msgRam.RxFIFO0SA = 0;
  hfdcan2.msgRam.RxFIFO1SA = 0;
  hfdcan2.msgRam.RxBufferSA = 0;
  hfdcan2.msgRam.TxEventFIFOSA = 0;
  hfdcan2.msgRam.TxBufferSA = 0;
  hfdcan2.msgRam.TxFIFOQSA = 0;
  hfdcan2.msgRam.TTMemorySA = 0;
  hfdcan2.msgRam.EndAddress = 0;
  hfdcan2.ErrorCode = 0;
  if (HAL_FDCAN_Init(&hfdcan2) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
}

In main.c:

uint8_t TxData[8] = {0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA};
 
uint8_t TxData2[8] = {0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAB};
uint32_t msgerror=0;
uint32_t msgerror1=0;
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_NVIC_Init(void);
 
/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/
 
/* USER CODE END PFP */
 
/* USER CODE BEGIN 0 */
  
	
/* USER CODE END 0 */
 
/**
  * @brief  The application entry point.
  *
  * @retval None
  */
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();
 
  /* USER CODE BEGIN Init */
 
  /* USER CODE END Init */
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_FDCAN1_Init();
  MX_FDCAN2_Init();
 
  /* Initialize interrupts */
  MX_NVIC_Init();
  /* USER CODE BEGIN 2 */
	
	TxHeader.Identifier = 0x120;
  TxHeader.IdType = FDCAN_STANDARD_ID;
  TxHeader.TxFrameType = FDCAN_DATA_FRAME;
  TxHeader.DataLength = FDCAN_DLC_BYTES_8;
  TxHeader.ErrorStateIndicator = FDCAN_ESI_ACTIVE;
  TxHeader.BitRateSwitch = FDCAN_BRS_OFF;
  TxHeader.FDFormat = FDCAN_CLASSIC_CAN;
  TxHeader.TxEventFifoControl = FDCAN_NO_TX_EVENTS;
  TxHeader.MessageMarker = 0;
	
	HAL_FDCAN_Start(&hfdcan1);
	HAL_FDCAN_Start(&hfdcan2);
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
		
		 if (HAL_FDCAN_AddMessageToTxFifoQ(&hfdcan2, &TxHeader, TxData) != HAL_OK)
			{
				/* Transmission request Error */
				msgerror++;
			}
			if (HAL_FDCAN_AddMessageToTxFifoQ(&hfdcan1, &TxHeader, TxData2) != HAL_OK)
			{
				/* Transmission request Error */
				msgerror1++;
			}
 
		HAL_Delay(100);
    /* Retreive Rx messages from RX FIFO0 */
 
  
  /* USER CODE END WHILE */
 
  /* USER CODE BEGIN 3 */
 
  }

Is there something obvious I am missing?