Post by thread:[PIC]: Pic to Compact Flash Card Interfacing?

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 _________________________________________________________________ Join the world s largest e-mail service with MSN Hotmail. http://www.hotmail.com -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

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: {Quote hidden}> 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 -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

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: {Quote hidden}>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 > >_________________________________________________________________ >Join the world s largest e-mail service with MSN Hotmail. >http://www.hotmail.com > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics > > ------------------------------------------- Mark Samuels ARMA Design Tel:(858) 373-1320 Fax:(858) 373-1325 Email: spam_OUTmarkTakeThisOuTarmanet.com Web: http://www.armanet.com The information contained in this electronic message is private and may contain privileged, confidential or inside information. Any distribution, copying or forwarding or use of this communication by anyone other than the intended recipient(s) is strictly prohibited and may be unlawful. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Have you looked into MMC cards? SPI interface. www.compsys1.com/workbench/On_top_of_the_Bench/MMC_Project/mmc_pr oject.html {Quote hidden}> Hi everyone, > > I am trying to interface a compact flash card to a Pic for some cheap > large storage. > > 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 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

> 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 -- http://www.piclist.com hint: To leave the PICList .....piclist-unsubscribe-requestKILLspam@spam@mitvma.mit.edu