Multimedia Card read / write commands?

[ChrisKnight]

I have recently decided to use an MMC storage card for storing data on the fly from a data acquisition setup.

I am having a bit of trouble finding the required commands for writing to and reading from the card.

The System Summary avaiable from the MMC Association (mmc.org) notes that these commands are available but does not indicate what their binary, hex or other format might be.

Anyone here programmed a microcontroller to write to an MMC ?

If so could you enlighten me as to the appropriate command structure?

Cheers
Chris

 

[Madcow]

Here's a link to a site using a compact flash card.
It might be simmilar.

http://barrymichels.com/ide/

 

[vege]

Chris,

I'm hoping to do the same thing soon, so have you looked at the specs on the Sandisk site? It seems to have everything you need.

http://www.sandisk.com/pdf/oem/ProdManualMMCv5.2.pdf

Regards
Jean-Michel.

 

[ChrisKnight]

Jean-Michel,

I just found a copy of that yesterday. There is quite a lot of info in there and I think I have worked out how to send the commands.

I just have to write some code to my PICAXE to check if I can interogate the card as I think I should be able to.

Cheers
Chris