STM32H7 HAL_SPI_Transmit_DMA not working (return HAL_ERROR)

Configure the TX DMA only:

    /* Configure the DMA handler for Transmission process */

    hdma_tx.Instance                 = SPIx_TX_DMA_STREAM;

    hdma_tx.Init.FIFOMode            = DMA_FIFOMODE_DISABLE;

    hdma_tx.Init.FIFOThreshold       = DMA_FIFO_THRESHOLD_FULL;

    hdma_tx.Init.MemBurst            = DMA_MBURST_INC4;

    hdma_tx.Init.PeriphBurst         = DMA_PBURST_INC4;

    hdma_tx.Init.Request             = SPIx_TX_DMA_REQUEST;

    hdma_tx.Init.Direction           = DMA_MEMORY_TO_PERIPH;

    hdma_tx.Init.PeriphInc           = DMA_PINC_DISABLE;

    hdma_tx.Init.MemInc              = DMA_MINC_ENABLE;

    hdma_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;

    hdma_tx.Init.MemDataAlignment    = DMA_MDATAALIGN_BYTE;

    hdma_tx.Init.Mode                = DMA_NORMAL;

    hdma_tx.Init.Priority            = DMA_PRIORITY_LOW;

    HAL_DMA_Init(&hdma_tx);

    /* Associate the initialized DMA handle to the the SPI handle */

    __HAL_LINKDMA(hspi, hdmatx, hdma_tx);

But, in HAL_SPI_Transmit_DMA.c check with the RX DMA:

  /* Packing mode management is enabled by the DMA settings */

  if (((hspi->Init.DataSize > SPI_DATASIZE_16BIT) && (hspi->hdmarx->Init.MemDataAlignment != DMA_MDATAALIGN_WORD))    || \

      ((hspi->Init.DataSize > SPI_DATASIZE_8BIT) && ((hspi->hdmarx->Init.MemDataAlignment != DMA_MDATAALIGN_HALFWORD) && \

                                                         (hspi->hdmarx->Init.MemDataAlignment != DMA_MDATAALIGN_WORD))))

  {

    /* Restriction the DMA data received is not allowed in this mode */

    errorcode = HAL_ERROR;

    __HAL_UNLOCK(hspi);

    return errorcode;

  }

After STM32H7xx_HAL_Driver V1.4.0 / 30-November-2018:

HAL SPI:

Update HAL_SPI_Transmit_DMA : checking hmdtx instead of hdmrx.