What is the proper method to re-initialize SD card interface to support removal/reinsertion of SD card?

[Tim Russell]

My SD card interface (using SDMMC1) stops working after the SD card has been removed/re-inserted.

I have tried un-mounting using f_mount(0, &SDPath, 0) and then re-mounting with no success.

As a test, I executed the following for each transaction:

f_mount(&SDFatFs, &SDPath, 0);

f_open(&SDFile,.....);

f_write(&SDFile, .....);

f_close(&SDFile);

f_mount(0, &SDPath, 0);

If I remove/re-insert the SD card after the 1st transaction, I get an FR_DISK_ERR error on the f_open() on the second transaction (following the reinsertion of the SD card). I have traced this error down into the HAL_SD_ReadBlocks_DMA() functions which gets a timeout on the call to SDMMC_CmdBlockLength(hsd->Instance, BLOCKSIZE).

Any suggestions?

[Tim Russell]

Lctasca,

My SD code is functioning properly now.

The code I am using is as follows,

FATFS_UnLinkDriver(SDPath);

FATFS_LinkDriver(&SD_Driver, SDPath);

f_mount(&SDFatFs, &SDPath, 0);

f_open(&SDFile,.....);

f_write(&SDFile, .....);

--- if write error, go back to top to re-init ---

f_sync(&SDFile);

[iw2lsi]

Thanks Tim...

I was stuck on the same problem and your solution works for me.

Best Regards,

Giampaolo

[dbgarasiya]

just make changes configuration of sd card , problem definately in configuration of sd card

best of luck

[TimeDigger]

Hi dbgarasiya,

I would like to try it.

Do you have any pinpoint suggestions to start from :)

[BB_it]

I see this topic is quite old, but no good solution provided yet and this is most related thread on my search. For me solution which is not causing memory leak is:

to add HAL_SD_Init(&hsd) just before f_mount(&SDFatFs, &SDPath, 1). Otherwise I was able to mount SD only first time after card insertion and on all subsequent reinsertions receiving timeouts.

[Lctasca]

The code that worked for me at that time was:

extern SD_HandleTypeDef hsd;
HAL_SD_Init(&hsd);
HAL_SD_InitCard(&hsd);
 
if(f_mount(&SDFatFS, SDPath, 1) == FR_OK)
{
	if(f_open(&SDFile, file_pah, (FA_WRITE | FA_READ | FA_CREATE_ALWAYS)) == FR_OK)
	{ 
		// DO SOMETHING WITH THE FILE
	
		f_close(&SDFile);
		f_mount(NULL, SDPath, 1);
		HAL_SD_DeInit(&hsd);
	}
}

Unfortunately, I don't have the hardware anymore to test if it still works in the newest versions of STM Cube IDE