>> As I understand it using CMD13 would let us check the card status register to establish that the card had in fact >> entered idle state but without causing a state change itself. >> The card state should not change as a result of issuing a CMD13. Hope this makes sense. This sounds good, and I may have only used CMD1 because it is a simple command that I knew, and just wanted to check that the card would give a correct response. So... try out CMD 13, see if it works and improves the library. Maybe it's faster as you say. If your tests go well, I can add your code to the lib. I assume you cannot use CMD13 while you are in the middle of a read or write, and therefore will need to change the state before using this command. stopwatch lib is great for testing speed, maybe compair the speed of CMD13 vs CMD1 with response checks. It is great to have someone interested in library improvements :) Matt.
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