Jot Down: STM32H7 HAL_SPI_Transmit_DMA not working (return HAL

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.

Jot Down