I am using stm32h743zi with my custom board. I configured fd can 1 as classic can as in cubemx example. I configured the baudrate as 125 kbit/s.
But after sending couple of packets, it stops sending due to fifo full error. How can i clear the fifo?
My clock speed is 400 mhz. FDCAN kernel clock is 36 mhz.
This is the rest of the configuration :
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.ProtocolException = ENABLE;
hfdcan1.Init.NominalPrescaler = 16;
hfdcan1.Init.NominalSyncJumpWidth = 1;
hfdcan1.Init.NominalTimeSeg1 = 12;
hfdcan1.Init.NominalTimeSeg2 = 5;
hfdcan1.Init.DataPrescaler = 16;
hfdcan1.Init.DataSyncJumpWidth = 1;
hfdcan1.Init.DataTimeSeg1 = 12;
hfdcan1.Init.DataTimeSeg2 = 5;
hfdcan1.Init.MessageRAMOffset = 0;
hfdcan1.Init.StdFiltersNbr = 1;
hfdcan1.Init.ExtFiltersNbr = 0;
hfdcan1.Init.RxFifo0ElmtsNbr = 1;
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 = 32;
hfdcan1.Init.TxFifoQueueMode = FDCAN_TX_FIFO_OPERATION;
hfdcan1.Init.TxElmtSize = FDCAN_DATA_BYTES_8;
FDCAN_TxHeaderTypeDef TxHeader;
uint8_t TxData[8] = { 0, 1, 2, 3, 4, 5, 6, 7 };
TxHeader.Identifier = 0x321;
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;
if (HAL_FDCAN_Start(&hfdcan1) != HAL_OK)
Error_Handler();
while (1)
{
uint32_t rr = HAL_FDCAN_GetTxFifoFreeLevel(&hfdcan1);
if(rr != 0)
{
HAL_StatusTypeDef tt = HAL_FDCAN_AddMessageToTxFifoQ(&hfdcan1, &TxHeader, TxData);
if (tt != HAL_OK)
{
printf("bb");
}
}
else
{
printf("aa");
}
HAL_Delay(100);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
What could be the problem?
