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>> http://home.clear.net.nz/pages/joecolquitt/sdhc.html
>=20
> That's very clear.  In the failure case, why didn't "do" go low
> during "cs" high?  Are you properly detecting and handling that
> possibility?

No. In my defence, M'lud, you see something that apparently
works robustly so you aren't thinking of failure detection

The attached is a zoom-in of when it goes right

"when DO floats when you assert CS, it means the card is busy
programming"

If DO is actually floating as hi-Z, and the dsPIC input is also
floating (as an input), it sounds like I should at least add a
pull-down, if only to eliminate a possibility

Thanks

Joe=

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