Dear ST community,
long story made short:
the workaround proposed here fixed the problem for me. Thank you!
Detailed description:
Am am using the STM32F4. I observed this problem as well, when I started to use FatFS on SDIO SD card with DMA templates (w/o DMA templates, this problem did NOT occur).
In my situation, the problem was relatively hard to trace - the system resettet randomly from time to time, something between once and up to five times per day. Reason for the reset itself was that the IWDG kicking in.
And the IWDG kicked in, because the controller got stuck in the function SDMMC_GetCmdResp1 in this loop:
do
{
if (count-- == 0U)
{
return SDMMC_ERROR_TIMEOUT;
}
}while(!__SDIO_GET_FLAG(SDIOx, SDIO_FLAG_CCRCFAIL | SDIO_FLAG_CMDREND | SDIO_FLAG_CTIMEOUT));
I applied the changes to the function SD_DMAReceiveCplt and modified it to use SDIO, so that my function now looks like this:
static void SD_DMAReceiveCplt(DMA_HandleTypeDef *hdma)
{
SD_HandleTypeDef* hsd = (SD_HandleTypeDef* )(hdma->Parent);
uint32_t errorstate = HAL_SD_ERROR_NONE;
/* Send stop command in multiblock write */
if(hsd->Context == (SD_CONTEXT_READ_MULTIPLE_BLOCK | SD_CONTEXT_DMA))
{
errorstate = SDMMC_CmdStopTransfer(hsd->Instance);
if(errorstate != HAL_SD_ERROR_NONE)
{
hsd->ErrorCode |= errorstate;
HAL_SD_ErrorCallback(hsd);
}
}
/* Disable the DMA transfer for transmit request by setting the DMAEN bit
in the SD DCTRL register */
hsd->Instance->DCTRL &= (uint32_t)~((uint32_t)SDIO_DCTRL_DMAEN);
/* CHANGED PART START*/
/* Check current state of Command Register and don't clear those flags */
if (hsd->Context == (SD_CONTEXT_READ_SINGLE_BLOCK | SD_CONTEXT_DMA))
{
if (__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_CMDREND))
{
/* Clear only selected flags */
__HAL_SD_CLEAR_FLAG(hsd, ((uint32_t)( SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DTIMEOUT |
SDIO_FLAG_TXUNDERR | SDIO_FLAG_RXOVERR |
SDIO_FLAG_CMDSENT | SDIO_FLAG_DATAEND | SDIO_FLAG_DBCKEND)));
}
else
{
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDMMC_STATIC_FLAGS);
}
}
else
{
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDMMC_STATIC_FLAGS);
}
/* CHANGED PART END*/
hsd->State = HAL_SD_STATE_READY;
HAL_SD_RxCpltCallback(hsd);
}
From my point of view, ST should seriously investigate this problem.
Thanks again, @Hockuba.Krzysztof and to all who have been working on this workaround!
Joachim
