Post by thread:[PIC] PIC with SD card on SPI interface / Fat Libr

Hello, After reading AN1003 (USB interface to SD-card), I start thinking to use an SD card as a stand-alone application for data-logging in a new project. AN1003 is mentioning this as a possible application, referring to the FAT library. But on the MicroChip site I can not find any FAT library. Does anyone know, where I can find this library? Thanks Jens

"Alan B. Pearce" <spam_OUTA.B.PearceTakeThisOuTrl.ac.uk> wrote in message news:034301c72e99$7afb9310$.....1979f682KILLspam@spam@space.rl.ac.uk... > >But on the MicroChip site I can not find any FAT library. >> >>Does anyone know, where I can find this library? > > I don't know if Microchip has ever released a FAT library, but all the > required information is in a document on the Microsoft website. Search for > FATGEN103.PDF. It contains a complete explanation of the FAT filesystem, > and > pseudo C code examples for each step. Searching for the above PDF produced this link, which may be useful in and of itself: http://pic18fusb.online.fr/wiki/wikka.php?wakka=MsDrive Jeff -- "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety" - B. Franklin, Bartlett's Familiar Quotations (1919)

Where did you find AN1003? ----- Original Message ----- From: "Jens M. Guessregen / Mailinglists" <jmg_mailinglistsKILLspammcm-it.de> To: "Microcontroller discussion list - Public." <.....piclistKILLspam.....mit.edu> Sent: Tuesday, January 02, 2007 12:50 PM Subject: [PIC] PIC with SD card on SPI interface / Fat Library {Quote hidden}> Hello, > > After reading AN1003 (USB interface to SD-card), I start thinking to use > an SD card as a stand-alone application for data-logging in a new > project. > AN1003 is mentioning this as a possible application, referring to the > FAT library. > But on the MicroChip site I can not find any FAT library. > > Does anyone know, where I can find this library? > > Thanks > > Jens > > --

AN1003 is at www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en024394 . I believe it is relying on the OS talking to the USB to handle the FAT file system. The PIC probably only knows how to do sector reads and writes. I wrote some FAT16 stuff myself by studying all the available documentation and using Hex Workshop to see what's on the various sectors of various sized MMC/SD cards. My FAT code ended up in the IQ512M at http://www.dovesystems.com . Harold > Where did you find AN1003? > {Original Message removed}

It seems any code available on the net is in C. Does anyone know where code for the pic in Assembly might exist? I don't have a C compiler and no experience with it. Thanks, Fred ===================================================== Hello, After reading AN1003 (USB interface to SD-card), I start thinking to use an SD card as a stand-alone application for data-logging in a new project. AN1003 is mentioning this as a possible application, referring to the FAT library. But on the MicroChip site I can not find any FAT library. Does anyone know, where I can find this library? Thanks Jens _________________________________________________________________ Fixing up the home? Live Search can help http://imagine-windowslive.com/search/kits/default.aspx?kit=improve&locale=en-US&source=hmemailtaglinenov06&FORM=WLMTAG

fred jones wrote: > It seems any code available on the net is in C. Does anyone know where code > for the pic in Assembly might exist? I don't have a C compiler and no > experience with it. > Thanks, > Fred > ===================================================== Try this for a start: http://www.piclist.com/techref/microchip/index.htm

> I don't know if Microchip has ever released a FAT library, > but all the required information is in a document on the > Microsoft website. Search for FATGEN103.PDF. It contains a > complete explanation of the FAT filesystem, and pseudo C code > examples for each step. http://www.microsoft.com/whdc/system/platform/firmware/fatgen.mspx You think about this? Best Jens

> > www.microsoft.com/whdc/system/platform/firmware/fatgen.mspx > > > >You think about this? > > Looks like Microsoft have hidden it behind a EULA, but it > seems to be available here Yes, they have hidden it, but it is still available for free without registration as Word-document. Best Jens

yes, sorry that I did not make that clear. I am interested in writing data to an SD RAM card for my next project. I have no experience with C or a compiler, only assembly however all the examples I found were in C. I don't mind writing it from scratch but would rather not if it is available. I'm really not so interested in the details on how it works as opposed to just wanting to get it working as quick as possible. Thanks for all the links posted, I'll have a look at them now. Fred From: William "Chops" Westfield <EraseMEwestfwspam_OUTTakeThisOuTmac.com> > It seems any code available on the net is in C. Does anyone > know where code for the pic in Assembly might exist? You mean specifically WRT implementing FAT, right? That wasn't very obvious... BillW _________________________________________________________________ Experience the magic of the holidays. Talk to Santa on Messenger. http://clk.atdmt.com/MSN/go/msnnkwme0080000001msn/direct/01/?href=http://imagine-windowslive.com/minisites/santabot/default.aspx?locale=en-us

Here's an alternative solution which may save you some development time - FAT implemented on a chip. You can buy just the chip or boards including an SD slot. http://www.saelig.com/miva/merchant.mvc?Screen=PROD&Product_Code=FF003&Category_Code=FF Cheers, Zik On 1/4/07, fred jones <boattowspam_OUThotmail.com> wrote: {Quote hidden}> yes, sorry that I did not make that clear. I am interested in writing data > to an SD RAM card for my next project. I have no experience with C or a > compiler, only assembly however all the examples I found were in C. I don't > mind writing it from scratch but would rather not if it is available. I'm > really not so interested in the details on how it works as opposed to just > wanting to get it working as quick as possible. > > Thanks for all the links posted, I'll have a look at them now. > Fred > > > From: William "Chops" Westfield <@spam@westfwKILLspammac.com> > > > It seems any code available on the net is in C. Does anyone > > know where code for the pic in Assembly might exist? > > You mean specifically WRT implementing FAT, right? That wasn't > very obvious... > > BillW > > _________________________________________________________________ > Experience the magic of the holidays. Talk to Santa on Messenger. > http://clk.atdmt.com/MSN/go/msnnkwme0080000001msn/direct/01/?href=http://imagine-windowslive.com/minisites/santabot/default.aspx?locale=en-us > > -

> yes, sorry that I did not make that clear. I am interested in > writing data > to an SD RAM card for my next project. I have no experience with C or a > compiler, only assembly however all the examples I found were in > C. on the early pics (and modern bottom of the range ones) it made sense to write in assembler, the chips were so small that the overhead of a compiler would have been unacceptable and the programs had to be fairly simple because that was all that would fit. however with the PIC18 series (and even more so with the PIC24/DSPIC series) things have changed, memory is far less tight than it used to be and the instruction sets have been designed with C compilers at least somewhat in mind. C is quicker to write and far easier to read (provided its written cleanly rather than falling into the trap of using every dirty trick in the book) and you can still use ASM for special instructions or performance critical code.