This app note below shows how to use the SPI bus/mode to talk to an SDIO card. I have cut and paste the example and it compiles correctly, but when I run the program, it behaves the same, regardless whether or not there is an SD card in.
The result is, it gets stuck waiting for a response that never comes, and goes into its infinite while(1).
Has anyone got this to work? Can anyone post some code that works?
Thanks,
AH