Question
CAN Bus Error: TX FIFO has no allocated RAM memory? Issue from CubeMX ?
Hi all,
I'm struggling for some time to get the CAN bus of my Evalboard (STM32H745I-DISCO) working. No matter how I configure the CAN bus in CubeMX, I always end up in the following error area and I don't know why:
/* Check that the Tx FIFO/Queue has an allocated area into the RAM */
if ((hfdcan->Instance->TXBC & FDCAN_TXBC_TFQS) == 0U)
{
/* Update error code */
hfdcan->ErrorCode |= HAL_FDCAN_ERROR_PARAM;
return HAL_ERROR;
}First, my FDCAN initialization looks like this:
static void MX_FDCAN1_Init(void)
{
hfdcan1.Instance = FDCAN1;
hfdcan1.Init.FrameFormat = FDCAN_FRAME_CLASSIC;
hfdcan1.Init.Mode = FDCAN_MODE_NORMAL;
hfdcan1.Init.AutoRetransmission = ENABLE;
hfdcan1.Init.TransmitPause = DISABLE;
hfdcan1.Init.ProtocolException = DISABLE;
hfdcan1.Init.NominalPrescaler = 12;
hfdcan1.Init.NominalSyncJumpWidth = 1;
hfdcan1.Init.NominalTimeSeg1 = 5;
hfdcan1.Init.NominalTimeSeg2 = 2;
hfdcan1.Init.DataPrescaler = 12;
hfdcan1.Init.DataSyncJumpWidth = 1;
hfdcan1.Init.DataTimeSeg1 = 5;
hfdcan1.Init.DataTimeSeg2 = 2;
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 = 16;
hfdcan1.Init.TxFifoQueueElmtsNbr = 16;
hfdcan1.Init.TxFifoQueueMode = FDCAN_TX_FIFO_OPERATION;
hfdcan1.Init.TxElmtSize = FDCAN_DATA_BYTES_8;
if (HAL_FDCAN_Init(&hfdcan1) != HAL_OK)
{
Error_Handler();
}Then I configure the RX filter, start the CAN bus and configure the TX settings:
/* Configure Rx filter */
sFilterConfig.IdType = FDCAN_STANDARD_ID;
sFilterConfig.FilterIndex = 0;
sFilterConfig.FilterType = FDCAN_FILTER_MASK;
sFilterConfig.FilterConfig = FDCAN_FILTER_TO_RXFIFO0;
sFilterConfig.FilterID1 = 0x321;
sFilterConfig.FilterID2 = 0x7FF;
if (HAL_FDCAN_ConfigFilter(&hfdcan1, &sFilterConfig) != HAL_OK)
{
Error_Handler();
}
/* Start FDCAN bus */
if (HAL_FDCAN_Start(&hfdcan1) != HAL_OK)
{
Error_Handler();
}
/* Configure Tx Settings */
TxHeader.Identifier = 0x321;
TxHeader.IdType = FDCAN_STANDARD_ID;
TxHeader.TxFrameType = FDCAN_DATA_FRAME;
TxHeader.DataLength = FDCAN_DLC_BYTES_2;
TxHeader.ErrorStateIndicator = FDCAN_ESI_ACTIVE;
TxHeader.BitRateSwitch = FDCAN_BRS_OFF;
TxHeader.FDFormat = FDCAN_CLASSIC_CAN;
TxHeader.TxEventFifoControl = FDCAN_NO_TX_EVENTS;
TxHeader.MessageMarker = 0;Only after these mentioned settings are done I try to send a simple message but that always ends in the above mentioned error area:
FDCAN_HandleTypeDef hfdcan1;
FDCAN_FilterTypeDef sFilterConfig;
FDCAN_TxHeaderTypeDef TxHeader;
uint8_t TxData[8]={0xCC,0xDD};
int main(void)
{
...
MX_GPIO_Init();
MX_FDCAN1_Init();
while (1)
{
if (HAL_FDCAN_AddMessageToTxFifoQ(&hfdcan1, &TxHeader, TxData) != HAL_OK)
{
Error_Handler();
}
HAL_Delay(1000);
}
}Why do I always end up in this error area? The TXBC register is also constantly zero, but I have set TX Buffer via CubeMX. What am I doing wrong?
I would be pleased about answers.