SDIO Gets stuck

[drJonesy]

hi 

I am trying to get an sd card to work with my custom board, uses STM32F412RET6.

when i try to mount or do anything other than init in 1 bit mode the code gets stuck at this point. I have been able to read block size and number from the SD card but that is it.

 while(!__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXOVERR | SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DTIMEOUT))
  {
    if(__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXDAVL))
    {
      *(tempscr + index) = SDIO_ReadFIFO(hsd->Instance);
      index++;
    }
    else if(!__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXACT))
    {
      break;
    }

    if((HAL_GetTick() - tickstart) >=  SDMMC_SWDATATIMEOUT)
    {
      return HAL_SD_ERROR_TIMEOUT;
    }
  }

 

[TDK]

The SDIO peripheral has race conditions where data needs read out quickly enough otherwise it overflows. Use a higher clock prescaler to see if that solves the problem. If it does, the solution would be to use DMA or rewrite code to be faster. Using Release mode can be a bandaid.

[drJonesy]

DMA is enabled and prescaler is set to 250