Hey guys, I've been following this very helpful thread but haven't made much progress. I've figured out it's not detecting the card is in since I get STA_NOINIT and STA_NODISK from the MMC init function. I'm using the 012 arduino software.
I've measured the pins with a multimeter and I suspect one of the ground pins isn't connected quite right. So I was wondering how you guys have it hooked up? I bought just the SD card holder and stuck a breakaway thing with the side with the long pins going in to the holder and wires soldered to the short pin side as shown below. I'm using a seeduino which has a 3v3 switch and it's hooked according to the diagram in the OP.
edit>oh right and the question: how do you guys have your card holder hooked up? Is there a better way of doing it? I could have gotten the card holder with a pcb soldered on from sparkfun but it was $15 but I want to use it in a final pcb design too. If nothing works I guess I'll have to suck it up and buy that sd holder board.
Any help would be great!