Harold,
any reason you're using a level translator instead of just using a voltage
divider on the pic->sd lines and nothing on the sd->pic line (since 3.3V is
high enough on a 5V pin)? I've seen both implementations and I'm wondering
if there's a good reason for a level translator.
Thanks,
- Marcel

On 7/15/06, Harold Hallikainen <harold@hallikainen.com> wrote:
>
> I just finished some C18 code that talks to MMC/SD cards. I'm reading and
> writing text files using FAT16. It can also format cards from 128M to 1G.
> I use an SPI interface to the card. I'm running the PIC at 5V and using a
> Maxim level translator to get to the 3 or 3.3V (I'm at home and don't
> remember the exact voltage). The MMC/SD is pretty easy to talk to. Digging
> thru the details of FAT16 was fun. If needed, I may be able to send you
> some code.
>
> Harold
>
>
> > I am developing a PIC based project that will play MP3 sound effects and
> > music.
> >   I have decided to use the STA013 MP3 decoder.
> >   To simplify development, I want to store all of my MP3 files on an SD
> > card or CF card.
> >   This would allow me to simply add and remove files with a PC and Card
> > reader.
> >   When the card is plugged into my PIC circuit, the PIC will need to
> read
> > data from FAT encoded data files out of the SD or CF card. I would
> > prefer to use the SD card since they are smaller and lighter (important
> > in my application). I am not sure if its tougher to interface a CF vs.
> > SD card to a PIC18 series. I found the pinouts for the SD card, however
> > its not 100% clear how to interface to a PIC (additional interface
> > circuity, pull up resistors, etc.). Another help would be to find some
> > PIC drivers to read data from FAT files on these cards. Any direction
> > would be helpfull.
> >   Thanks
> >
> >
> >
> >
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