fat.c / ex_fat.c: SD card, contents messed up.

halibatsuiba · Joined: 12 Aug 2009 Posts: 30

Yet another datalogger-project where data is supposed to be stored in SD-card so it could be analysed in PC.

I format SD card with PC, create some directories and files.
Then I move card to my test circuit and use ex_fat.c to see the contents of card (with "dir"-command).

Listing is messed up, there is directory/file names in 8+3-format but names are all messed up. Example:

hÌ*Äáí.kÈ
\ÌfÄeâvb.k"
Äíd\$f'â.eÙ
¸Édìd¼.da;

I can create/remove directories and files, append data to files, cat files etc. with PIC but they do not show when I connect card to PC. Everything created earlier with PC is ok.

Files/directories created with PIC are ok if I check them with PIC.

What could possibly be wrong?

Not likely a hardware problem because I can create and delete files with PIC.

Source code: ex_fat.c

Only changed buffer sizes in main()-function and pin assignments for SD card connection.

char buffer[255] -> char buffer[64];
char opt_buffer[255] ->char opt_buffer[64];

PIC: 18F2550
Compiler: PCH 4.099
SD-card: Canon 8MB, Kingston 128MB microSD, Kingston 2GB microSD (tried with FAT32)

asmallri · Joined: 12 Aug 2004 Posts: 1634 Location: Perth, Australia

You might want to try my drivers. It works with all these cards.
_________________
Regards, Andrew

http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!!

halibatsuiba · Joined: 12 Aug 2009 Posts: 30

Guaranteed to work? Money back if not working as expected?

What is the writing speed to SD card with your drivers in kilobytes per second?

asmallri · Joined: 12 Aug 2004 Posts: 1634 Location: Perth, Australia

johanpret · Joined: 23 Oct 2006 Posts: 33 Location: South Africa

Andrew ,
I want to use the CCS compiler (PCWHD) on the Pic24FJ256 and use your SD Driver did you ever test it on this configuration to see if it work? I see you have it for the PIC18 and CCS. It should work I can't see any reason why not but would like to know if you testes it?

Johan

asmallri · Joined: 12 Aug 2004 Posts: 1634 Location: Perth, Australia

SpoonBilly · Joined: 25 May 2010 Posts: 16

halibatsuiba · Joined: 12 Aug 2009 Posts: 30

Can you give a list of PIC cpus and SD-cards you have tested your software with?

Also it would be nice to get general hw and sw requirements, like how much RAM and EEPROM it uses, which CCS compiler you have tested it with etc.

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