SD Card

[nechi]

Posted on March 30, 2017 at 18:49

Hi, 

I'm using the cubeF4 to work on FATFS application and i'm searching for a function in FATFS library that can return the content of the SD Card: number of files and their names.  

Thank you.

[Tesla DeLorean]

Posted on March 30, 2017 at 19:12

You'll have to write such code, the FATFS library provides functions like f_opendir, f_readdir, you'd use these to process and count files in the current directory, and you'd need recurse and descend into the directories you encounter at each level.

[Imen.D]

Posted on March 30, 2017 at 19:21

Hi,

There is FatFs_uSD example on STM32CubeF4 firmware package that can help you to use most of the features offered by FatFs and to configure a microSD drive.

You can get help from the User manual UM1721'Developing Applications on STM32Cube with FatFs'

Imen

[nechi]

Posted on March 31, 2017 at 10:11

Thank you, i'll understand more FATFS functions 

[nechi]

Posted on March 31, 2017 at 10:13

Thank you Imen, i'm already working with the 

FatFs_uSD example, i'll see this manual.

[john doe]

Posted on April 01, 2017 at 03:15

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

the code example doesn't print the count, but it does walk the directory tree and print the contents

[nechi · Accepted solution]

Posted on April 03, 2017 at 15:25

Thank you all, all your suggestions were helpful 

I saved files in a directory created in the SD Card and i just used the function '

f_readdir' 

into a loop to count files in my directory

f_opendir (&dir,'mydirectory');

while (1)

{    res_dir = f_readdir(&dir, &fno);    if((res_dir==FR_OK)&&(fno.fname[0]!= 0))    {       nb_file_dir++;    }

}

[Tesla DeLorean]

Posted on April 03, 2017 at 16:31

That will also count sub-directories, you should also check the attributes.

[nechi]

Posted on April 11, 2017 at 18:02

My SDcard is 8GB with one directory where i save files from the F4 discovery and it works well. Now i faced some problems, i added an other directory (2.6Gbyte) in the sd card and it's not related to the first one. when i save new files in the first directory i notice that the old ones are overwritten with 'UUUUUU...'. Did you know this issue please? I can't understand why they are modified even though i didn't opened any of them with the stm32 i just count the number of the existing files in the directory and then i create new ones  

[FPicc.1]

Hi @nechi 

I did pretty much the same thing, but I want to create a file with the name of how much files there are in the directory, for that reason I didn't put the code in the while. Here's the code:

//Count the files in SD and create a new one

  res = f_opendir(&dir, "/");

  if(res==FR_OK)

  {

  res_dir = f_readdir(&dir, &filinfo);

  if((res_dir==FR_OK)&&(filinfo.fname[0]!= 0))

  {

  file_number++;

  }

  }

  sprintf(file_name, "file%d.csv", file_number);

//Open file to read / create it if it doesn't exist

  fresult = f_open(&fil, file_name, FA_OPEN_ALWAYS | FA_WRITE);

file_number only goes up to 1 and doesn't count the rest, it only updates 'file1'. Do you have any ideia of what can I do?