Saving data to memo cards (sd, compactflash, memostick etc.)

wedilo · Joined: 16 Sep 2003 Posts: 71 Location: Moers, Germany

Hello folks,
How can I saving my data to memory cards like sd-card, memostick, compactflash etc. ??
Are they all working by different way?
I would like to use a card with an easy handling, but I don't know which and how.

Please help

73 Sven

Pete Smith · Joined: 17 Sep 2003 Posts: 55 Location: Chester, UK

Ian McCrum · Joined: 26 Oct 2003 Posts: 14 Location: Northern Ireland

Compact Flash cards have a mode where they are simple memory mapped. These can be driven simply with normal i/o lines, though since you won't have enough lines you would normally use latches (74HCT573) for the address lines.

I believe there was a detailed article in Circuit Cellar, and available for download as an archive, on interfacing to Compacy Flash.

Regards
Ian
_________________
Ian McCrum, email address held at
www.eej.ulst.ac.uk/~ian

iseron · Joined: 21 Feb 2004 Posts: 12 Location: Santiago - Chile

NOw i'm finishing a project with a compact FLash - a datalogger exactly- and over all my research in all kind of memory types, the CF is the cheaper-resistant-supported-free specs- etc. You can use the 8 data bits of your PIC, and not using all the lines in memory mapped mode because it works with hard disk ATA comands who use only software to map the address to access in 512 bytes.

The CF has an internal buffer of 512 bytes and because of that yo can avoid an external buffer for fixed operations...

Plus you can read 2 good links.

MP3 player ---> PIC877+CF+DECODER ( no extra buffer & FAt32 support)
http://www.walrus.com/~raphael/html/mp3.html

Article of magazine.
http://www.circuitcellar.com/echips-pdfs/0201/c0201mspdf.pdf

I think this will help you .
Ignacio.

wedilo · Joined: 16 Sep 2003 Posts: 71 Location: Moers, Germany

Hello Pete, Ian and iseron,
thank you all for this great help. :-)))

73 Sven / DL2EBQ