CubeMX - FatFS - SDIO not working

Below is what I get when halting the CPU in the infinite while() :

Note that on my custom design, there is no pull-up on the board for D0-D3 and CMD lines. I use the STM32 internal pull-up instead.

Hi eigerMount,

Well!

1.8 MBps seems a bit on the sad side, the cheap 128MB SD card supplied with ST's EVAL boards should be able to do that, I'd expect a decent 16GB SDHC card to post >7MBps writing and >10MBps reading

One more benchmark:

Hi

I know this has been a while but I want to open this case up again as I am experiencing the same issue.

After performing the following:

/* StartDefaultTask function */
void StartDefaultTask(void const * argument)
{
for(;;) {
/*##-1- Link the micro SD disk I/O driver ##################################*/
if(FATFS_LinkDriver(&SD_Driver, (char *)SD_Path) == 0) { 
 /*##-2- Register the file system object to the FatFs module ##############*/
 if(f_mount((FATFS *)&SDFatFs, (TCHAR const*)SD_Path, 0) == FR_OK) {
 for(;;) {
 fr = WriteSDCard();
 osDelay(1000);
 if(fr) {
 f_mount(NULL,'',1);
 break;
 }
 }
 /*##-11- Unlink the micro SD disk I/O driver ###############################*/
 FATFS_UnLinkDriver((char *)SD_Path);
 }
}
}
}

FRESULT WriteSDCard() {
 char * filename = 'TEST.txt';
 char Buf[7] = {'H','e','l','l','o','
','
'};
 uint8_t BufLen = 7;
 FRESULT fr;
 
 fr=f_open((FIL *)&MyFile, (char *)filename, FA_OPEN_ALWAYS | FA_READ | FA_WRITE); 
 if(fr){
 return fr;
 } 
 
 fr = f_lseek((FIL *)&MyFile,MyFile.fsize); 
 if(fr){
 return fr;
 }
 
 fr= f_write((FIL *)&MyFile, (uint8_t *)Buf, BufLen, (void *)&BytesWritten);
 if(fr){ 
 return fr;
 }
 
 fr=f_close((FIL *)&MyFile); 
 if(fr){ 
 return fr;
 }
}
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If WriteSDCard returns anything but FR_OK then when it unlinks the driver/unmounts and tries to link/mount again i get stuck in this while loop forever looking for the start bit:

#ifdef SDIO_STA_STBITERR 
 while(!__HAL_SD_SDIO_GET_FLAG(hsd, SDIO_FLAG_RXOVERR | SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DTIMEOUT | SDIO_FLAG_DBCKEND | SDIO_FLAG_STBITERR))
#else /* SDIO_STA_STBITERR not defined */
 while(!__HAL_SD_SDIO_GET_FLAG(hsd, SDIO_FLAG_RXOVERR | SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DTIMEOUT | SDIO_FLAG_DBCKEND))
#endif /* SDIO_STA_STBITERR */
 {
 if(__HAL_SD_SDIO_GET_FLAG(hsd, SDIO_FLAG_RXDAVL))
 {
 *(tempscr + index) = SDIO_ReadFIFO(hsd->Instance);
 index++;
 }
 }�?�?�?�?�?�?�?�?�?�?�?�?

I am using CubeMx 4.0 STM32Cube V1.0, RTOS is also enabled.

Am I possibly seeing WriteSDCard return an error if the task has context switched during an f_*** operation?

Thanks

A new thread would have made more sense after 3 years.

I'm pretty sure that the SDIO and FATFS are not thread safe. I'd lean to having IO in a single thread, as you would need to serialize access to the peripheral / card.

I would generally try to avoid repetitively mounting and unmounting the card, f_sync or f_close should be sufficient to push all file system structures onto the media