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Hi Joe,
I also found that the documentation you can find is somewhat inconsistent!
So the better source is the "Simplified specification" at SDcard associatio=
n site:
https://www.sdcard.org/developers/tech/pls/

Attached my Init code (stripped from library, added some comment). It works=
 well=20
but is not so beautiful because I converted from the microchip library to A=
SM=20
for  18F and deeply modified. If you want I can send to you the complete co=
de,=20
where remains some comment in italian...

I see that you dont abort if the response is "error", maybe the code is str=
ipped...
Not all card responds to command CMD8

After a command that doesn't give a response (CMD55) or AFTER the last byte=
 of=20
the response you must send 0xFF for sync (also if more data is required lik=
e=20
OCR) but not in case of command CMD8

       Nicola



On 18/08/2011 9.01, IVP wrote:
> Hi all,
>
> having the dickens of a job initialising a 4GB SDHC card. Unknown
> manufacturer. And probably won't find out until I can read the card's
> registers
>
> The procedure is, from what I read,
>
> Send>  74 clocks with /CS high and DI high
> Send CMD0
> Send CMD8
> Send CMD55 + ACMD41, repeat until response =3D 0
>
> Here's my results
>
> http://home.clear.net.nz/pages/joecolquitt/sdhc.html
>
> This procedure seems to be the one that generates the most "can't
> get it to work" posts and the replies aren't consistent. Some say turn
> this bit on, turn that bit off, repeat this bit, don't repeat etc etc
>
> My reading includes
>
> http://elm-chan.org/docs/mmc/mmc_e.html
>
> which is referred to often, but IMVHO has inconsistencies with
> the official SD spec pdfs he links to
> Also tried the MChip forums, AVRfreaks and others
>
> I'm at a loss to see why the card doesn't come out of initialisation
> so I can move on to the next steps in the flow charts
>
> More exact diagrams would be really really helpful. They say so
> much more than lines and lines of geek speak
>
> Any suggestions ?
>
> TIA
>
> Joe

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