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Shane Gingell
Shane Gingell
Associate II
July 12, 2018
Question

f_mount always returning FR_NO_FILESYSTEM

  • July 12, 2018
  • 6 replies
  • 2846 views
Posted on July 12, 2018 at 11:39

I am using system workbench (eclipse) as IDE and cubemx to provide setup code for both SDIO(1 bit mode) and FATFS middleware. I am using a STMF407VE and have double checked the SD adapter has correct pin-out.

FATFS myfats;

if(f_mount(&myfats, SDPath, 1)== FR_OK){

returns false

and

FATFS myfats;

if(f_mount(&myfats, SDPath, 1)== FR_NO_FILESYSTEM){

always returns true

    This topic has been closed for replies.

    6 replies

    Doug Kehn
    Doug Kehn
    Associate II
    July 12, 2018
    Posted on July 12, 2018 at 14:43

    FR_NO_FILESYSTEM is an indication that the media needs to be formatted with f_mkfs().

    Tesla DeLorean
    Tesla DeLorean
    Guru
    July 12, 2018
    Posted on July 12, 2018 at 14:50

    It might also indicate that you're reading junk from the media, or the block addresses are being shifted.

    How large is the card in question? Is it EXFAT formatted? Have you enabled support for EXFAT?

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    Shane Gingell
    Shane GingellAuthor
    Associate II
    July 13, 2018
    Posted on July 13, 2018 at 10:06

    I tried a fresh reformat using FAT32 and also tried a couple of different cards. Size of card is 16GB

    Shane Gingell
    Shane GingellAuthor
    Associate II
    July 13, 2018
    Posted on July 13, 2018 at 10:04

    I have tried using an older version of cubemx as there is a number of posts about problems with latest version of cubemx generation of SD code. I have now gone to cubemx version 4.21.

    Using this version of cubemx and system work bench as IDE on a STM32F$107VE I now have got it to mount and open but it won't write or close.

    both

    if(f_mount(&myfats, SD_Path, 1)== FR_OK)

    and

    if(f_open(&my__file, f_name, FA_WRITE | FA_CREATE_ALWAYS)== FR_OK)

    return true

    but both

    if(f_write(&my__file, my_data, sizeof(my_data), &num_written) == FR_OK)

    and

    if(f_close(&my__file) == FR_OK)

    return false.

    Even if I just try to open then close a file without writing the close will return false.

    Tesla DeLorean
    Tesla DeLorean
    Guru
    July 13, 2018
    Posted on July 13, 2018 at 12:56

    This is all rather top-level stuff. The failure is occurring at the DISKIO layer, I don't use CubeMX, but there are an abundance over issues reported over the SDIO/SDMMC and FatFS code it outputs. Missing call-backs, and using polled mode are problems I've seen reported.

    The current version of CubeMX is V4.26.0, the F4 library V1.21.0

    The examples in the HAL code tree work a lot better

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    Shane Gingell
    Shane GingellAuthor
    Associate II
    July 13, 2018
    Posted on July 13, 2018 at 10:14

    STM32F407VE is MCU use sorry for the typo

    :)

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