AVR-Chat

Hi TVM,

Theres a quite a bit of information out there on interfacing to SD
Cards, when I did it a year or so ago, I found enough information on
Google to get me going. Things to watch out for:

- SD cards are not programmed byte by byte, they must be programmed in
512 byte pages. 
- The initialization must be done exactly as the datasheet describes.

If you cant find any datasheets, send me an email on
hein@andante.co.nz and ill email a few through to you.

Cheers
Hein B
Auckland, New Zealand.




--- In AVR-Chat@yahoogroups.com, "David Collier"
<from_yahooAVRchat@...> wrote:
>
> not strictly a processor specific question, sorry, ( and if anyone
knows 
> of a better place to ask it, please tell )
> 
> I'm trying to build some s/w to talk to a MicroSD ( previously known as 
> TransFlash ) card in SPI mode.
> 
> There don't seem to be any published data sheets on the SanDisk web 
> site, they just say "conforms to the specification"
> 
> But you can't get the specification without paying $oodles to join the 
> interest group.
> 
> This is nonsense - I don't have this problem with other components.
> 
> My immediate need is to know what SPI clock speed it will talk to me at.
> 
> But I suppose if I have that I'll immediately need the s/w info for how 
> to interact with it. I think most of that is in the filleted document 
> they so graciously allow you to download.
> 
> I know a number of people around here have written stuff to talk to 
> SPI-SD cards - is any of it GPL or anything so I can go get it to see 
> how it's done?
> 
> TVM
>