SDIO and SD fat access example?

[natblist]

Posted on February 09, 2012 at 01:06

Hi Chaps,

Going slowly mad trying to get Chan Fat working with the sdio libs on a stm32f4.

I'm using the most recent (1.0.0) library for the F4, and the low level access demo within that library builds and (at least appears to ) work OK. 

I've spent many, many hours attempting to patch in 0.9 version of fatfs from chan (thks chan, you're a hero) - but I can't get it to work.

If possible, I'd really really appreciate a demo project/source (or direction to - though I've scoured the web and can't find anything that works!)

I'll post separately about the current problems I'm having with the my current build, but a working example would sort it.

Many thanks,

nat.

#hse-sdio-stm32 #stm32-fat-chanfat-fatfs-sdio #sdcard-stm32f4-sdio-fatfs #sdcard-stm32f4-sdio-fatfs

[aambreen]

Posted on October 24, 2012 at 09:03

@Clive

I have run your project.

f_mount is returning 0 ( FR_OK)

f_open is returning 1 (FR_DISK_ERROR)

I debugged f_open() function and i have analyzed that in f_open() the call to check_mounted() function is returning 1 (FR_DISK_ERROR)

Inside check_mounted() function vol is assigned 0 and then it skips the part under the comment //Check if the file system object is valid or not. Then the control goes to the part written under the comment //the following code attempts to mount the volume

In this section disk_initialize() function is called and this function is returning 0(disk initialized successfully)

After disk_initialization() function disk_ioctl() function is returning 1 (FR_DISK_ERROR).

[aambreen]

Posted on October 24, 2012 at 10:51

disk_ioctl() function isn't returning any value.I checked the return value on UART but it is not displaying any value.

[Tesla DeLorean]

Posted on October 24, 2012 at 17:12

disk_ioctl() returns RES_OK

You might want to confirm you can do the sector reads (via disk_read(), or equivalent), and verify you can read from the card. If that doesn't work independently, then FatFs will have bigger issues.

[aambreen]

Posted on October 25, 2012 at 07:32

Ok i will get back to you after verifying disk_read() function........i checked f_unlink() function too but it isn't working.....I had been banging my head to figure out the problem since last week :(

[aambreen]

Posted on October 25, 2012 at 08:18

disk_read() function is also returning 1 (not OK) ...... Can you give me code for direct disk_read() call?

[Tesla DeLorean]

Posted on October 25, 2012 at 17:38

unsigned char Buffer[512];

disk_read(0, Buffer, 0, 1);

[aambreen]

Posted on October 31, 2012 at 11:18

@Clive

disk_read() is now functional i have made certain changes in the code and made it working...I have used SD_ReadSingleBlock() to check if this function can read sectors or not

Now tell me the next step?

I want to know the steps that are being followed while implementing FATFS as i don't know the A B C of FATFS....I really want to make my concepts clear as to how this library works and what are the steps that we must follow to implement this file system.

[aambreen]

Posted on October 31, 2012 at 11:22

My ultimate goal is to store an image on SD Card....i would really appreciate if you give me some guideline on this as well

[Tesla DeLorean]

Posted on October 31, 2012 at 15:26

I'm not sure I want to be dragged into your project/work this deep, I think you can read the FatFs documentation/website and source as easily as I can. If you need to understand how it works you'll need to study it.

[aambreen]

Posted on November 02, 2012 at 06:27

Thanks alot for guiding me :)