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Aditya Tiwari
Aditya Tiwari
Associate II
February 22, 2018
Solved

How to use LFN Feature in FatFs to change default 8.3 file Format

  • February 22, 2018
  • 3 replies
  • 3768 views
Posted on February 22, 2018 at 13:42

Hello there,

I am working on MSD Bootloader which I successfully Implemented  in STM32F207VETx. However while working I found that t

he default build expect 8.3 format file names, and not Long File Names (LFN).

I tried using LFN by making following changes in ffconf.h

&sharpdefine _CODE_PAGE 437

&sharpdefine _USE_LFN 1    /* 0 to 3 */ / When enable the LFN feature, Unicode handling functions (option/unicode.c) must

/ be added to the project.

&sharpdefine _MAX_LFN 40    /* Maximum LFN length to handle (12 to 255) */

&sharpdefine _LFN_UNICODE 0 /* 0:ANSI/OEM or 1:Unicode */

&sharpdefine _STRF_ENCODE 0

and getting the following error undefined reference to `ff_convert' 

which I think is a function in unicode.c 

So My question is where can I Find Unicode handling functions as i want to give a long name for my file

#tilen-majerle #clive-one
This topic has been closed for replies.
Best answer by Tesla DeLorean
Posted on February 22, 2018 at 14:23

You might want to migrant to a more current version of FatFS, sounds like you are at 0.09 or something.

You would need to add the CCSBCS.C file to your project to get ff_convert(), ff_wtoupper(), etc

There should be an equivalent in the F2 SPL trees too

\STM32F4xx_DSP_StdPeriph_Lib_V1.8.0\Utilities\Third_Party\fat_fs\src\option\ccsbcs.c

3 replies

Andrew Neil
Andrew Neil
Super User
February 22, 2018
Posted on February 22, 2018 at 13:56

Note that FatFs is a 3rd-party product - entirely unrelated to ST.

FatFs documentation is here: 

http://elm-chan.org/fsw/ff/00index_e.html

 

FatFs User Forum: 

http://elm-chan.org/fsw/ff/bd/

 
A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
Tesla DeLorean
Tesla DeLoreanBest answer
Guru
February 22, 2018
Posted on February 22, 2018 at 14:23

You might want to migrant to a more current version of FatFS, sounds like you are at 0.09 or something.

You would need to add the CCSBCS.C file to your project to get ff_convert(), ff_wtoupper(), etc

There should be an equivalent in the F2 SPL trees too

\STM32F4xx_DSP_StdPeriph_Lib_V1.8.0\Utilities\Third_Party\fat_fs\src\option\ccsbcs.c

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    Aditya Tiwari
    Aditya TiwariAuthor
    Associate II
    February 23, 2018
    Posted on February 23, 2018 at 11:10

    Thanks Andrew and Clive1 for your support.

    Your Answers were really helpful and I successfully changed the default 

    8.3 format file names to Long File Name(LFN).

    I migrated the code from 

    CCSBCS.C file to my project to get ff_convert(), ff_wtoupper(), and changed the format to my desired length.

    However,

    I have another question for you, Is it possible that I can download a file in .DFU format using MSD Bootloader  as by default it supports .BIN file. If YES then how?

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