Using FatFs , i am unable to get long filenames, but i get the short filenames

[Javier1]

I am able to read the fixed length fname.

But the pointer to the long filename is always 0.

 

this is how im reading trough the list of files

FRESULT detect_binariesFolder(){
	fresult=f_opendir(&dir, "lu");
	fresult=f_readdir(&dir, &filinfo);
	fresult=f_findfirst(&dir, &filinfo, "lu", "*.bin");//http://elm-chan.org/fsw/ff/doc/findfirst.html
 
	   while (fresult == FR_OK && filinfo.fname[0]) {         /* Repeat while an item is found */
			fresult=f_findnext (&dir, &filinfo);
	   }
 
	fresult=f_closedir(&dir);
	return fresult;
}

I tried the three different cubeMx options for long filenames :

• static buffer on the BSS
• dynamic buffer on heap
• dynamic buffer on stack

None of them works.

 

My setup:

• stm32f105RBt6 custom board.
• SD Card trough SPI2, sandisk ultra 16GB.
• CubeMx version 6.4.0, STM32Cube_FW_F1_V1.8.4 package which uses FatFs version R0.10c, Nov 09, 2014.
• CubeIDE Version: 1.8.0

[Javier1 · Accepted solution]

Okay that wasnt so hard, i just needed to find up to date documentation.

(C:\Users\**your user**\STM32Cube\Repository\STM32Cube_FW_F1_V1.8.4\Middlewares\Third_Party\FatFs\doc)

 

Apparently the pointer needs to be initialiced by you first.

adding this three lines fixes the code:

FRESULT detect_binariesFolder(){
    char lfn[_MAX_LFN + 1];
    filinfo.lfname = lfn;
    filinfo.lfsize = sizeof lfn;
 
    	fresult=f_opendir(&dir, "lu");
    	fresult=f_readdir(&dir, &filinfo);
    	fresult=f_findfirst(&dir, &filinfo, "lu", "*.bin");//http://elm-chan.org/fsw/ff/doc/findfirst.html
     
    	   while (fresult == FR_OK && filinfo.fname[0]) {         /* Repeat while an item is found */
    			fresult=f_findnext (&dir, &filinfo);
    	   }
     
    	fresult=f_closedir(&dir);
    	return fresult;
    }