STM32F439 SDMMC Command Timeout

[YHass.14]

Hello all,

I access SDMMC directly through the APIs: HAL_MMC_WriteBlocks() and HAL_MMC_ReadBlocks().

Sometimes the access to SDMMC does not does not succeed with Timeout error.

Can you please advise me?

Thanks in advance.

Yacob.

[TDK]

One possibility out of many is that noise on the signal lines is causing the message to be discarded. Slow your clock down and try again.

[YHass.14]

I added more disable interrupts, especially in SDMMC_CmdWriteSingleBlock and SDMMC_CmdReadSingleBlock and it seems it solved the problem.

I changed the above functions as the following:

  __set_PRIMASK(1); // disable interrupts (I added)
  
  SDIO_SendCommand(SDIOx, &sdmmc_cmdinit);
  
  /* Check for error conditions */
  errorstate = SDMMC_GetCmdResp1(SDIOx, SDMMC_CMD_READ_SINGLE_BLOCK, SDIO_CMDTIMEOUT);
 
 __set_PRIMASK(0); // enable interrupts (I added)

Thanks anyway.

Yacob.

[YHass.14]

Hello all,

Unfortunately the disable interrupts does not help always.

Sometimes the SDMMC stuck and I receive timeout error.

I use FreeRTOS and access to SDMMC from number of tasks.

The access to SDMMC is protected by semaphore.

Can any one advise?

Yacob.