Re: Compact flash programming and specs
From: Dirk Bruere at Neopax (dirk_at_neopax.com)
Date: 09/23/04
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Date: Thu, 23 Sep 2004 18:19:32 +0100
Tim Wescott wrote:
> Bernie wrote:
>
>> Can someone help me out with finding specs/protocol for programming
>> compact flash. I am logging data with an A/D and need to save it to a
>> compact flash card which will be read by a card reader on a laptop. I
>> read another thread that talked about needing to use the FAT32
>> protocol for MS Windows. I don't know how to do that either, but also
>> need info on connections and reading/writing to Compact Flash cards.
>>
>> Thanks in advance,
>>
>> Bernie
>
>
> You've searched the web?
>
> As far as I know any flash card will come to you as a mass of blank
> storage. I don't know if the standard is for NAND flash only or if it
> supports NOR flash -- but that should be on the web. Either way, if you
> want it to be readable as a disk you need to impose a file system on it.
> Generally with DOS-derived machines this is done by treating the memory
> as if it were a disk and writing the usual sectorized data (with a FAT
> in the case of a Windows system). I've forgotten the details of FAT-16
> and never learned the details of FAT-32 but again -- this should be on
> the web.
>
> You'll find that writing the FAT 32 file system requires reading lots of
> picky, poorly documented details (remember this is Microsoft you're
> dealing with). You can, however, buy file system software from various
> vendors. I know that US Software sells this, but I don't know their
> current name. You _can_ search the web for this, but you'd be better
> off to buy a copy of some magazine that addresses the embedded systems
> marketplace (Embedded Systems Programming, Nuts & Volts, etc.) and look
> at the ads in the back. Embedded Systems is hard to get subscriptions
> to, so you might want to see if you can find ads on their website.
You might try looking at the open source drivers used by Linux
-- Dirk The Consensus:- The political party for the new millenium http://www.theconsensus.org
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