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My team has been working on a project that contains a SD card based on Standard Library. Recently we've decided to migrate to HAL and it started.

Fortunately, All part of our project were changed as well as possible to HAL and they're working great but we don't know why SD card doesn't work well.

We have not changed peripheral's configuration clocks, but we had to change "clock frequency of the SDMMC controller" to 1.5MHz in HAL while it was 24MHz in STDLibrary. Because, it didn't work at all.

In addition, our customers are using a wide range of SD card types and all of them are OK but not great. I mean, FR_DISK_ERR is returned a lot in during of working but our device tries to get FR_OK.

Unfortunately, we always receive FR_DISK_ERR in some SD cards while, it worked all the time in our STDLibrary version.

Furthermore, we've found if "f_mount" function was called once and after that you take away the SD card and put it again, it will never work until you reset your microcontroller.

My microcontroller is STM32F427VI and SDIO configured as same as this:

 hsd.Instance = SDIO;

 hsd.Init.ClockEdge = SDIO_CLOCK_EDGE_RISING;

 hsd.Init.ClockBypass = SDIO_CLOCK_BYPASS_DISABLE;

 hsd.Init.ClockPowerSave = SDIO_CLOCK_POWER_SAVE_DISABLE;

 hsd.Init.BusWide = SDIO_BUS_WIDE_1B;

 hsd.Init.HardwareFlowControl = SDIO_HARDWARE_FLOW_CONTROL_DISABLE;

 hsd.Init.ClockDiv = 14;

and it's working with 4bits wide bus.

Also, my device's clock is 96MHz and "APB2 Peripheral Clock" is 48MHz.

Edited:

As for re-inserting the card - I did initial again by recalling f_mount when FR_DISK_ERR was returned by f_open. I did it until giving FR_OK but it's never returned FR_OK in this case.

I realized f_mount doesn't initial SDIO for second time as dear Jacek Ślimok said.

Because there's a flag that doesn't let 'SD_initialize' be recall again (SD_initialize function includes BSP_SD_Init).

Here is the diskio.c's code:

DSTATUS disk_initialize (
    BYTE pdrv /* Physical drive nmuber to identify the drive */
)

{

 DSTATUS stat = RES_OK;

 if(disk.is_initialized[pdrv] == 0)

 {

     disk.is_initialized[pdrv] = 1;

     stat = disk.drv[pdrv]->disk_initialize(disk.lun[pdrv]);

 }

 return stat;

}

Now I used SD_PowerON and SD_InitCard before recalling f_mount and it worked correctly now. It's a bug, isn't it?

But other problems have still remained. It doesn't work with 24MHz clock at all and FR_DISK_ERR is still returned by some SD cards.

Edited (2020/02/24):

Finally, it worked when I updated my HAL Library to STM32Cube_FW_F4_V1.24.2. But HAL still doesn't work as well as Standard Peripheral. For example, I can't set 'ClockDiv' to '0' (24MHz) yet. It doesn't work at all. Now I set 'ClockDiv' to '1' (16MHz) that's not good enough for my project but I have to. Or if you take SDCard away and insert it again when program is working you can not init FATFS with f_mount. It's not going to work at all. You have to init SDIO Peripheral again by yourself. Unfortunately, now I can't put any time for getting more detail about what's going on in my schedule. Maybe in future.

Ali Esmailpor
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  • As for re-inserting the card - that's because it needs to be initialized again, then `f_mount`-ed. By initialization I don't mean GPIO / DMA initialization (which you can probably omit and get away with it) but the SD commands that need to be sent to the card again after it's inserted but before filesystem gets mounted. In particular - see `HAL_SD_InitCard` and the functions inside that send SD commands - mainly `SD_PowerON` and `SD_InitCard`. – J_S Jan 10 '20 at 11:53
  • Related: https://community.st.com/s/question/0D50X0000BEZwxPSQT/setting-up-sdio-for-the-stm32f103zc-fatfs-frdiskerr-error – EsmaeelE Jan 12 '20 at 09:43
  • In st communtiy they said this method works to solve similar problem: https://community.st.com/s/question/0D50X00009XkWceSAF/stm32f411re-stm32cube-fatfs-sdio-sdcard-always-returns-frdiskerr – EsmaeelE Jan 12 '20 at 10:12
  • Thank you, but I've done everything that they said. – Ali Esmailpor Jan 12 '20 at 12:36
  • @AliEsmailpor, see these links may related. https://stackoverflow.com/questions/51100378/f-mount-returns-fa-disk-err?rq=1 https://stackoverflow.com/questions/33681083/fatfs-cant-initialize-the-sd-card?rq=1 – EsmaeelE Jan 20 '20 at 08:10
  • https://stackoverflow.com/questions/43835115/cannot-mount-sd-using-fatfs-on-stm32 – EsmaeelE Jan 20 '20 at 08:25
  • @AliEsmailpor Instead of wasting more than a month experimenting with this bloatware HAL you would write your own register level driver in one week (if you do not have experience) or in one day (if you bin the HAL and gain experience). An additional bonus: you know what is going on. – 0___________ Jun 15 '21 at 01:11

1 Answers1

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disk.is_initialized[0] =0; // force reinit

Before mounting. That's the easy way to support hot plugged sd card.

Hans Lepoeter
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