SDIO DMA usage

Posted on July 08, 2016 at 16:09

I'm trying to get the SDIO system working with DMA. The system works in the configuration without DMA.

Now I set the read and write operations in the ''sd_diskio.c'' to DMA, by adding _DMA to the starting commands BSP_SD_WriteBlocks_DMA and BSP_SD_ReadBlocks_DMA.

Now all the interrupts for SDIO and DMA fire several times but the my system stops at

HAL_SD_CheckReadOperation in line:

  /* Wait until the Rx transfer is no longer active */

  while((__HAL_SD_SDIO_GET_FLAG(hsd, SDIO_FLAG_RXACT)) && (timeout > 0U))

  {

    timeout--;  

  }

from hsd->SdTransferErr I got SD_RX_OVERRUN

any idea, what is wrong?

Best regards

Marco

#sdio-dma-error