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

[Pearless]

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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