The general idea of matrix scanning is, that you put 0 on only one of the columns (and 1 on the remaining), and watch, which row goes down to 0 (assuming that there are some pullups which keep the remaining columns in 1).

Your code watches the rows and columns, but there is nothing that makes some of them going 0 (no instruction setting any pin to 0). You need to output the 0 onto some of the columns and then read in the rows.

And, please, start with something really simple - don't attempt to read in multiple keys at once nor make fancy autorepeats. Simply, output onto your "debug" port (P2) what you detected that is pressed.

Jan Waclawek

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