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MMC cards and AVR Microcontroller

hi,
I'm in need of using mmc or sd memmory card in my project but
unfortunatly i don't have any idea how they works?
i know they need 3.3 v for working. should this voltage be percise?
I want to read and also write on it in spi mode using an avr. I've used
the programm suggested in some relevant sites but it seems there is a
bug in those programmes or mey be i can't used them properly.could
anyone introduce me a reliable source on this issue?
meny thanks
 
A

Adrian Jansen

Jan 1, 1970
0
hi,
I'm in need of using mmc or sd memmory card in my project but
unfortunatly i don't have any idea how they works?
i know they need 3.3 v for working. should this voltage be percise?
I want to read and also write on it in spi mode using an avr. I've used
the programm suggested in some relevant sites but it seems there is a
bug in those programmes or mey be i can't used them properly.could
anyone introduce me a reliable source on this issue?
meny thanks

Loads of good info at:

http://www.mcselec.com/index2.php?option=com_forum&Itemid=59&page=viewforum&f=9

And lots of card details from:

http://en.wikipedia.org/wiki/Secure_Digital_card

--
Regards,

Adrian Jansen adrianjansen at internode dot on dot net
Design Engineer J & K Micro Systems
Microcomputer solutions for industrial control
Note reply address is invalid, convert address above to machine form.
 
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