SD or MMC card as storage for logging

[Chris Barron]

sdfs3.zip
http://melabs.com/resources/samples.htm

Requires an 18F PIC, PBP 2.50b using PBPL.

See the sdreadme.txt, and SDschem.pdf files in the zip.
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I'll vouch for that !

I downloaded it, fully expecting to have to make some changes(other than pin assignments). I compiled the code and it worked the very first time .

What I would say in all seriousness though, is to check the pinout ever so carefully. Although in the schematic diagram the pic pins (via buffers) are wired to the correct SD card 'pins' you mut take care to note that the indented pin on the edge connector of the SD Card is pin number 9. You might then assume that next to it is pin 8, but no , the next pin along is pin 1

I took the indented pin to be pin 1 and the next pin to be 2, etc, and blew my first test SD card because there was a power reversal. (Pic was undamaged)

In summary, from the underside of the SD card with the pads exposed and the indent to the bottom, the pinout is like this..

8
7
6
5
4
3
2
1
~9


Other than that, the supporting code simply works as it should, many thanks to the author for that !

[HYETİK]

thanks for it I wil try
I will report the result

[SOMRU]

Hey there...
have been working on similar project,
check out

http://www.parallax.com/Store/Microc...me,ProductName

really cool device...

cheers

[mackrackit]

Hey there...
have been working on similar project,
check out

http://www.parallax.com/Store/Microc...me,ProductName

really cool device...

cheers

Tell me how you are going to stick an SD card into that?

[SOMRU]

mybad...
try this

http://www.roguerobotics.com/products/electronics/ummc

good luck.

[Chris Barron]

mybad...
try this

http://www.roguerobotics.com/products/electronics/ummc

good luck.

Yep thats neat , especially if you are pushed for space.

The SDFS software in picbasic doesn't require any other hardware though, apart from a socket for the card In my case I recovered one from a broken SD card reader (New ones cost less than £1 !), so it cost me nothing to get basic SD functionality

[mackrackit]

Yep thats neat , especially if you are pushed for space.

The SDFS software in picbasic doesn't require any other hardware though, apart from a socket for the card In my case I recovered one from a broken SD card reader (New ones cost less than £1 !), so it cost me nothing to get basic SD functionality

And the support from MeLabs can not be beat. A month or so ago I found a problem with APPEND. I am not good enough with FAT16 to fix it myself, so I told Jeff about it and now it is fixed. That is why it is now SDFS3. Where else can you get support like that?

I have tested SDFS more ways than I can count, even wore a SD card out reading and writing over and over.

SDFS just plain works.