Hello,
I am trying to set up the CAN protocol and receiving "Check that the selected buffer has an allocated area into the RAM" when using HAL_FDCAN_AddMessageToTxBuffer.
This is where the error is thrown, inside stm32h7xx_hal_fdcan.c
/* Check that the selected buffer has an allocated area into the RAM */
if (POSITION_VAL(BufferIndex) >= ((hfdcan->Instance->TXBC & FDCAN_TXBC_NDTB) >> FDCAN_TXBC_NDTB_Pos))
{
/* Update error code */
hfdcan->ErrorCode |= HAL_FDCAN_ERROR_PARAM;
return HAL_ERROR;
}
Here is CAN Initialization
void CAN1_Init(void)
{
CAN1.Instance = FDCAN1;
CAN1.Init.FrameFormat = FDCAN_FRAME_CLASSIC;
CAN1.Init.Mode = FDCAN_MODE_EXTERNAL_LOOPBACK; // EXTERNAL Means FDCAN treats its own transmitted messages as received
// messages
CAN1.Init.AutoRetransmission = ENABLE;
CAN1.Init.NominalPrescaler = 3; // Setting values for 500k bps
CAN1.Init.NominalSyncJumpWidth = 1;
CAN1.Init.NominalTimeSeg1 = 2;
CAN1.Init.NominalTimeSeg2 = 2;
CAN1.Init.TxBuffersNbr = 64;
CAN1.Init.TxEventsNbr = 32;
CAN1.Init.TxFifoQueueElmtsNbr = 32;
CAN1.Init.TxFifoQueueMode = FDCAN_TX_FIFO_OPERATION;
CAN1.Init.TxElmtSize = FDCAN_DATA_BYTES_16;
CAN1.Init.MessageRAMOffset = 0;
CAN1.Init.RxBuffersNbr = 64;
CAN1.Init.RxFifo0ElmtsNbr = 64;
CAN1.Init.RxFifo0ElmtSize = FDCAN_DATA_BYTES_16;
if (HAL_FDCAN_Init(&CAN1) != HAL_OK)
{
Error_Handler();
}
}
And Transmit function:
void CAN1_TX(void)
{
FDCAN_TxHeaderTypeDef TX_Header;
uint8_t CAN_Msg_Ptr[5] = {'H', 'E', 'L', 'L', 'O'};
TX_Header.DataLength = 1;
TX_Header.Identifier = 0x7DF;
TX_Header.IdType = FDCAN_STANDARD_ID;
TX_Header.TxFrameType = FDCAN_DATA_FRAME;
TX_Header.ErrorStateIndicator = FDCAN_ESI_ACTIVE;
TX_Header.BitRateSwitch = FDCAN_BRS_OFF;
TX_Header.FDFormat = FDCAN_CLASSIC_CAN;
TX_Header.TxEventFifoControl = FDCAN_STORE_TX_EVENTS;
TX_Header.MessageMarker = 0x00;
if (HAL_FDCAN_AddMessageToTxBuffer(&CAN1, &TX_Header, CAN_Msg_Ptr, FDCAN_TX_BUFFER0) != HAL_OK)
{
Error_Handler();
}
}
