[En-Nut-Discussion] FAT filesystem and SD/MMC cards

[Arnfinn Aas Eielsen]

Hello!

I'm trying to find out how I can read and write files to a SD/MMC card 
using a newly acquired Ethernut 2.1b.

I have made a mount for a SD/MMC card reader, a voltage divider for the 
output from the microcontroller, and connected it to the SPI bus. I 
have downloaded the "nutmmc" example from http://usbdip.de/en/nutmmc/ 
and it seems to run without problems on the hardware.

Now, I noticed that it is not possible to write files with the FAT code 
that I have found, and I wonder if there has been some development here 
lately. Is there somebody I can ask for some help if I have to write 
the functions myself? You can have whatever code I manage to come up 
with, if it would be of any interest. :)

Is there perhaps an alternative to the FAT file system when it comes to 
reading and writing the memory card? I noticed something called PNUT; 
is it usable for this kind of application? I don't need to read or 
write to the card from any other device than the Ethernut card, so I 
just need (wish for) an easy and simple way to handle files really...

Any help is appreciated!

Cheers,
Arnfinn Aas Eielsen