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I am trying to use a MMC with AT89C51RD2, but my SPI port is already occuped. Does anyone knows a library that do this without using SPI ports. Regards Gustavo
Devices share SPI using chip select (CS).
Dear Dan, I studied a little bit and realized about the CS, but the guy that did the board used the SPI ports to control de LCD as normal pins (I/O pins). we do not have time to change the board, so I am trying a sw solutions. Thanks for your attention. Regards Gustavo
"... so I am trying a sw solutions." Manufacturers of devices that use SPI often publish application notes that include examples of software (a.k.a., bit-banged) implementations of SPI.