How to find the address of stored data on a SD memory card?

[Byte_Butcher]

I've got a 2GB SD memory card that's formatted for FAT16, and I've put some data on it (just drag 'n' drop from windows) and now I need to read it back with my "device".
The catch is, I can't look up the data by filename... I need to know the physical memory address to retrieve the goods.

Is there an easy way (some kind of cute little utility?) that will tell me the starting addresses of the data items on my card?


Thanks!

steve

[mackrackit]

If you are using SDFS from MeLabs here is a snippet that might help.

SDOPEN_W:
' Open a file for write
	FAT_mode = "A"		' Write mode
	Gosub FSfopen		' Open file pointed to by Byte array FAT_FileName

  Serout2 PORTC.6, 16572, ["Open for write Error: ", Dec FAT_error, $d, $a]

Serout2 PORTC.6, 16572, [ "FILE NAME  ", STR FAT_FileName\11, $d, $a]
Serout2 PORTC.6, 16572, [ "DISK_fat  ", Dec DISK_fat, $d, $a]
Serout2 PORTC.6, 16572, [ "DISK_buffer  ", Dec DISK_buffer, $d, $a]
Serout2 PORTC.6, 16572, [ "SDC_sector_addr  ", Dec SDC_sector_addr, $d, $a]
Serout2 PORTC.6, 16572, [ "FAT_ccls   ", Dec FAT_ccls, $d, $a]
Serout2 PORTC.6, 16572, [ "LAST_CLUSTER ", Dec LAST_CLUSTER, $d, $a]
Serout2 PORTC.6, 16572, [ "FAT_c  ", Dec FAT_c, $d, $a]
Serout2 PORTC.6, 16572, [ "DISK_maxcls:  ", Dec DISK_maxcls, $d, $a]

[Byte_Butcher]

If you are using SDFS from MeLabs here is a snippet that might help.

Errr... welll... no... I'm not using SDFS. In fact I had to do a search just now to find out what the heck you're talking about.

But I've downloaded the files and have the SDReadme.txt open in front of me now and it looks like this is going to be very helpful for me.

It looks like I've got some reading to do... will be back later with more questions I'm sure.


Thanks Dave!!

steve

[mackrackit]

If you want to get into FAT32???
http://www.picbasic.co.uk/forum/showthread.php?t=11700
The new link to the file is near the end of the thread..

[Byte_Butcher]

Thanks Dave, but I can't use FAT32. The SD card lives inside another device that doesn't play FAT32.

Still researching my options....


steve

[mackrackit]

The origional SDFS is FAT16.
A cool thing about the SDFS32 is if you build your own card reader thingy it will be able to read or write to either one. It detects the format for you.