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'[PIC]: Pic to Compact Flash Card Interfacing?'
2002\10\15@064357 by Northy Northy

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Hi everyone,

I am trying to interface a compact flash card to a Pic for some cheap large
storage. I've read the article here:

http://www.chipcenter.com/circuitcellar/february01/c0201ms1.htm

But the code is badly commented :-(

And downloaded the Compact flash technical document from here:

http://www.compactflash.org/

But, i'm still a bit lost. There are three ways to interface to a compact
flash card, and I'm not sure which to use. Has anyone on this list used
Compact Flash in a design? It strikes me as a cheap and easy, not to mention
redily available storage media. Has anyone any comments on using it (e.g.
Just do this it s easy . Or don t bother it too much for a little PIC!).

Thanks for reading my post,

Graham North

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2002\10\15@065850 by bmichels

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I've done it in IDE mode.  It works for hard drives and CF cards.

http://www.barrymichels.com/ide


On Tuesday 15 October 2002 06:32 am, you wrote:
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2002\10\15@121052 by Mark Samuels

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Sorry, I relied more on the article to explain what was going on, than
comments in the code.
The method of access I described in the article is the "common memory"
mode, which was the only way to access the card with 8-bit data, in the
interest of saving I/O on the PIC.  However, all modes of access follow a
pretty similar scheme... load the appropriate registers with a particular
location, load a command register with a particular command, and away you go!

-Mark


At 10:32 AM 10/15/02 +0000, you wrote:
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-------------------------------------------
Mark Samuels
ARMA Design
Tel:(858) 373-1320
Fax:(858) 373-1325
Email: spam_OUTmarkTakeThisOuTspamarmanet.com
Web: http://www.armanet.com



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2002\10\16@090929 by miked

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Have you looked into MMC cards? SPI interface.

www.compsys1.com/workbench/On_top_of_the_Bench/MMC_Project/mmc_pr
oject.html

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2002\10\18@120113 by Herbert Graf

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> I am trying to interface a compact flash card to a Pic for some
> cheap large
> storage. I've read the article here:
>
> http://www.chipcenter.com/circuitcellar/february01/c0201ms1.htm
>
> But the code is badly commented :-(
>
> And downloaded the Compact flash technical document from here:
>
> http://www.compactflash.org/
>
> But, i'm still a bit lost. There are three ways to interface to a compact
> flash card, and I'm not sure which to use. Has anyone on this list used
> Compact Flash in a design? It strikes me as a cheap and easy, not
> to mention
> redily available storage media. Has anyone any comments on using it (e.g.
> Just do this it s easy . Or don t bother it too much for a little PIC!).

       I've dabbled in it and I choose IDE for one major reason: it lets you use
the exact same circuit with a hard drive! :) I had some success with getting
it going, it depends how "standard" you want to go about storing data. I
stored data in a file on a FAT16 partition but was limited to only reading
and writting to one file. TTYL

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