Problem with file creating on SD card with FatFs lib

[jean_prieur]

Posted on April 16, 2014 at 12:36

Hello,

I use a STM32F427 running with FreeRTOS. I try to create a file on my SD card, through SDIO, thestm32f4_discovery_sdio_sd.c (DMA mode). I also use the librairyFatFs R0.09, ported by Clive I think :)

This is my code to write a file:

FRESULT res;
FILINFO fno;
FIL fil;
DIR dir;
FATFS fs32;
UINT bw; /* File write count */
char* path;
char *fn; /* This function is assuming non-Unicode cfg. */

#if _USE_LFN
static char lfn[_MAX_LFN + 1];
fno.lfname = lfn;
fno.lfsize = sizeof lfn;
#endif
void
testsdcard(
void
)
{
// SDCard mount
memset(&fs32, 0, 
sizeof
(FATFS));
res = f_mount(0, &fs32);
memset(&fil, 0, sizeof(FIL));
res = f_open(&fil, 
''NEW.TXT''
, FA_CREATE_ALWAYS | FA_WRITE);
res = f_write(&fil, 
''hello YOU''
, 
sizeof
(
''hello YOU''
) , &bw);
f_close(&fil);

}

Of course before I configured the NVIC:

int
init_NVIC_sdio(
void
)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
// SDIO Interrupt ENABLE
NVIC_InitStructure.NVIC_IRQChannel = SDIO_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 6;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}

The behavior seems random. - sometimes it works, all of the ''res'' returns are OK and the file is created on the SD card - sometimesf_open returns ''FR_NOT_READY'' andf_write returns ''FR_INVALID_OBJECT'' Do you have any idea ? It's hard to debug because of the random behavior... Thanks !!

[jean_prieur]

Posted on May 07, 2014 at 15:46

Thanks. I'm not sure to understand this _LFN_UNICODE and _USE_LFN.

In my code:

_LFN_UNICODE = 0 (

0

=

ANSI/OEM

 and 

1

=

Unicode

)

_USE_LFN = 0 (

0

=

Disable LFN feature. _MAX_LFN and _LFN_UNICODE have no effect.

 1= Enable LFN)

Is it the same for you ?

Thanks a lot !

[jean_prieur]

Posted on May 07, 2014 at 15:53

If I configure_USE_LFN to =1 I need ff_convert() and ff_wtoupper() functions:

// The LFN working buffer occupies (_MAX_LFN + 1) * 2 bytes. To enable LFN,
// Unicode handling functions ff_convert() and ff_wtoupper() must be added
// to the project. When enable to use heap, memory control functions
// ff_memalloc() and ff_memfree() must be added to the project. */

But I'm unable to find these functions in my project. What I have to do ?

[francescatodiego]

Posted on May 07, 2014 at 16:15

I'm sorry jean but

I have

alzheimer

....

I totally forgot

You must include

the file

in the directory

option

according to the

chosen

code page

(Which

is always located

in the file

ffconf.h

) My project work with

_CODE_PAGE 1252

and include ccsbcs.c from option directory

Sorry again

I hope

I've given you

all the details

I have added my ffconf.h see attachment

________________

Attachments :

ffconf.h : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I14B&d=%2Fa%2F0X0000000bhh%2F7EY_H7YLydopDRRIZamrBZP0iLJBg0WY8pC0RTkP9_o&asPdf=false

[chen]

Posted on May 07, 2014 at 16:20

Hi

LFN = Long File Names.

''If I configure _USE_LFN to =1 I need  ff_convert() and ff_wtoupper() functions:''

See :

http://elm-chan.org/fsw/ff/en/appnote.html

So the convert function does some of the convertion functions from wchar.h

http://www.cplusplus.com/reference/cwchar/

[jean_prieur]

Posted on May 07, 2014 at 17:04

Hi Francescato,

Thanks for this comment. I try to put the ccsbcs.c file in my project, but it seems i also need to import 

pgmspace.h and maybe others...

This is a lot of functions and new libs just to write in lowercase and >8 characters isn't it ?

Do you think there is a proper way ? thanks !

[francescatodiego]

Posted on May 08, 2014 at 07:56

Jean

I'm not sure

that

is the right way

I

just

described

what

I did to

use long names

I'm not

a

FATFS

expert

but I'm sure

 , as the

comment

in

ffconf.h

,

_USE_LFN

must be

!

=

0 to enable

long file name

I do not know

the file

pgmspace.h

I tried

google

and

I have found only

references to

Arduino/Atmel AVR

.

What

compiler

do you use?

I work with

IAR

and the file

is not part

of my project

.

[jean_prieur]

Posted on May 08, 2014 at 12:12

I use Coocox, 

pgmspace.h is also not a part of my project.

I understand that I need 

_USE_LFN

 > 0 to enable long file name and lowercase, and thus I need ff_convert() and ff_wtoupper() functions which are not included in my project.

Do you use these two functions ?

Thanks a lot !

[chen]

Posted on May 08, 2014 at 12:28

Chan's app note :

http://elm-chan.org/fsw/ff/en/appnote.html

''To enable LFN feature, set _USE_LFN to 1, 2 or 3, and add a Unicode code conversion function ff_convert() and ff_wtoupper() to the project.''

I doubt any environment provides ff_convert() and ff_wtoupper() - these are specific to FatFS BUT they can be just wrappers around other functions that may already exist!

[francescatodiego]

Posted on May 08, 2014 at 13:31

In my project

I've also included

the

ccsbcs.c

file

(attached)

It contains some

code tables

and

the definition of

WCHAR

ff_convert

(/ *

Convert

character

, it returns

zero

in case of error

*

/

WCHAR

chr

, / *

Character code

to be converted

*

/

UINT

dir /

*

0:

Unicode

OEMCP

, 1:

OEMCP

to Unicode

*

/

)

WCHAR

ff_wtoupper

(/ *

High

converting the

character

*

/

WCHAR

chr

/ *

character

input

*

/

)

ccsbcs.c

is part of

FATFS

.

zip

(directory

src.option

) downloaded from FATFS site

The directory src.option

contains several files

where

the functions

ff_convert

and

ff_wtoupper

are defined.

I think

the file you

choose

must be consistent

with the selection of

_CODE_PAGE

in

file

ffconf.h

________________

Attachments :

ccsbcs.c : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I146&d=%2Fa%2F0X0000000bhg%2FDAgD8FtdQt9M7u9Y4lnaOShhzBC0qIsbAKLnfat6Jd0&asPdf=false

[jean_prieur]

Posted on May 08, 2014 at 15:36

Thanks everybody, my problem is solved !

In fact, I didn't use the right ccsbcs.c file

Now I use the one from FatFs site and everything seems working, I can write in lowercase !