f_utime

jdcowpland · ‎2014-01-31

Posted on January 31, 2014 at 09:31

Anyone got any experience using the f_utime function from chan's fatfs? I've got a function that uses it to put a timestamp on a file I create on an SD card, but it returns INVALID_NAME every time. Not quite sure why. Anybody have any ideas? (Btw, I'm using a STM32F415VG if that helps). My code looks like this:

FRESULT set_timestamp (char *obj)
{
FILINFO fno;
RTC_TimeTypeDef RTC_TimeStructure;
RTC_DateTypeDef RTC_DateStructure;
RTC_GetTime(RTC_Format_BIN,&RTC_TimeStructure);
RTC_GetDate(RTC_Format_BIN,&RTC_DateStructure);
int hour = RTC_TimeStructure.RTC_Hours;
int min = RTC_TimeStructure.RTC_Minutes;
int sec = RTC_TimeStructure.RTC_Seconds;
int month = RTC_DateStructure.RTC_Month;
int mday = RTC_DateStructure.RTC_Date;
int year = RTC_DateStructure.RTC_Year;
year+=2000;
fno.fdate = (WORD)(((year - 1980) << 9) | month << 5 | mday);
fno.ftime = (WORD)(hour <<11 | min <<5 | sec/2 );
return f_utime(obj, &fno);
}

#fatfs

jdcowpland · ‎2014-02-03

Posted on February 03, 2014 at 11:40

Ah yeah, thanks! turns out I was using the fatfs from 2011 so was getting a bit confused with the documentation! Any idea how to access a directory within a directory? i.e., say I wanted to open a folder in the path ''0:dir1/dir2''. I've tried using f_opendir and f_chdir, but each time it comes back saying no path. It's happy with ''0:dir1'' for opendir, or with ''/dir1'' for chdir, but can't seem to get it to go into the next directory.

Tesla DeLorean · ‎2014-02-03

Posted on February 03, 2014 at 15:44

Check the _FS_RPATH setting

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

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jdcowpland · ‎2014-02-26

Posted on February 26, 2014 at 13:48

From what I understand from that link, the following should work, but it doesn't:

res = f_chdir(''1:\dir1'');

res = f_chdir(''\dir2'');

It has no problem with the first line, but the second line says no file. Has anyone tried directories within directories with fatfs?

chen · ‎2014-02-26

Posted on February 26, 2014 at 15:15

Hi

It has been a while !

OK, I think the first one works because it explicitly has he drive. The path has to be complete - including the drive letter.

The latter does not work because FatFS does not know what the drive is.

It work on a PC because on a PC, there is a hidden variable that holds the current drive and gets filled in if it is not specified.

Incidentally, why is the drive label ''1'' ?

jdcowpland · ‎2014-02-26

Posted on February 26, 2014 at 15:52

I have

_FS_RPATH == 1 in my code, which according to the fatfs documentation means ''

When relative path feature is enabled (

_FS_RPATH == 1

), specified path is followed from the root directory if a heading separator is exist. If not, it is followed from the current directory set with

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

function.

'' Surely that means I don't need the drive number if I'm already in that drive? The reason I'm using drive 1 is that I have two drives(sd card and usb).

Tesla DeLorean · ‎2014-02-26

Posted on February 26, 2014 at 16:02

Is the structure \DIR1\DIR2? Or what exactly?

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jdcowpland · ‎2014-02-26

Posted on February 26, 2014 at 16:14

Yes, this is what it looks like from windows: E:\dir1\dir2

Tesla DeLorean · ‎2014-02-26

Posted on February 26, 2014 at 16:26

Wouldn't the expect syntax then be relative?

res = f_chdir(''1:/dir1'');

res = f_chdir(''dir2'');

or

res = f_chdir(''1:/dir1/dir2'');

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chen · ‎2014-02-26

Posted on February 26, 2014 at 16:28

''

I have

_FS_RPATH == 1 in my code, which according to the fatfs documentation means ''

When relative path feature is enabled (

_FS_RPATH == 1

), specified path is followed from the root directory if a heading separator is exist. If not, it is followed from the current directory set with

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

function.

'' Surely that means I don't need the drive number if I'm already in that drive?''

When you say ''

I have

_FS_RPATH == 1 in my code

'' - can the fatfs code see the define during compilation?

''i

f not, it is followed from the current directory set with

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

function.

'' Surely that means I don't need the drive number if I'm already in that drive?''

Has the f_chdir() been called before?

jdcowpland · ‎2014-02-26

Posted on February 26, 2014 at 16:37

Working! Thanks Clive. Looks like it was confusion over ''\'' or ''/''. Just used f_chdir(''1:/dir1/dir2'') and it worked 🙂