Lpc2000

My understanding (from sdcard.org) is that to use SD card without the
copyright protection is OK without license. To use the SD card with
copyright protection requires a license.

I think I have a found enough information on the FAT16 file system to write
my own FAT file system. But I have yet to find a specification that list
what commands are needed to read/write data from SD or MMC.  Some of the
docs say use 'CMD0' to do this, but it does not say that 'CMD0' == 0x00.
This is the information that I seek. I have found enough documentation on
the elctrical (SPI) interface.

On some of the code I have found that works with MMC is that card uses a lot
of magic numbers w/o much comments.  So unless I can find this last bit of
information it looks like I will purchase a license from www.prllc.com This
will most likely save me time in the long run.

Joe


> -----Original Message-----
> From: Jan Szymanski [mailto:janek@...] 
> Sent: Thursday, July 22, 2004 6:15 PM
> To: lpc2000@yahoogroups.com
> Subject: [lpc2000] Re: SD Card inferface
> 
> --- In lpc2000@yahoogroups.com, "Lasse Madsen" <lm@e...> wrote:
> > Hi Marcio,
> > 
> > The code is written for a SPI uart (MISO,MOSI,SCK) in the AVR
> processor
> > so I would guess SPI if what you refer as SD mode is the special 
> > "parallel transfer" mentioned in the SD CARD manual from Sandisk.
> > 
> > Best regards
> > l. madsen
> > 
> > -----Original Message-----
> > From: atmelbr [mailto:atmelbr@y...]
> > Sent: 22. juli 2004 22:04
> > To: lpc2000@yahoogroups.com
> > Subject: [lpc2000] Re: SD Card inferface
> > 
> > Lasse,
> >   The code is SPI mode,SD card mode or both ?
> > Regards,
> >        Marcio Montenegro
> > 
> > > --- In lpc2000@yahoogroups.com, "Lasse Madsen" <lm@e...> wrote:
> > > > Yes its VERY easy to port you only have to alter it one place
> and 
> > it's
> > > > all written in ANSI C so it requires a minimal effort. 
> > > > 
> > > > I have purchased it my self and ported it to some different
> > processors
> > > > with much success !
> > > > 
> > > > Best regards
> > > > Lasse Madsen
> > > >
> > 
> > 
> > 
> > 
> >  
> > Yahoo! Groups Links
> 
> It looks like only SPI/MMC mode specifications for SD cards 
> are freely available .
> I tried many times to contact people behind sdcards.org with 
> a questions about specifications and if it is legal to use SD 
> cards, but had no luck.
> Can anyone come across any specifications for file system 
> (FAT16) on SD cards ?
> Does anyone know if it is legal to use SD card in embedded 
> systems without a licence (as it is still unclear to me) ?
> 
> 
> 
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>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
>