[En-Nut-Discussion] MMC Card interface to Ethernut

[Simon Clarke]

Pearless wrote:

> Hi people,
>
>  
>
> I now have a MMC card (32MB) attached to an Ethernut 1.3g (v2.1 only 
> just arrived today) via SPI (total cost of hardware excluding the card 
> is about USD$5).
>
>  
>
> I can interrogate the card and all of its internal registers, 
> parameters and read sectors.
>
>  
>
> I am now working out how to access the FAT16 file system (one of four 
> possible file systems under the MMCA specs, te other being ‘universal’ 
> and ‘unknown’).
>
>  
>
> I note that there is also an option for up to 4 partitions under the 
> ‘hard disk like’ file system.
>
> Has anyone **ever** come across the ‘Hard disk like file system’ being 
> used on a MMC card as my research seems to indicate this is more 
> common with compact flash cards???
>
>  
>
> When it all seems to work, I intend to release it as a Ethernut 
> project, unless there is more immediate interest then I will share the 
> pre-alpha code.
>
>  
>
> Douglas
>
>  
>
>  
>
>
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>  
>
this may be of some help or guidance , although it's in german , and 
looks as if only read is implemented fat 16

http://www.ulrichradig.de/index.html

Simon