Membrane Keypad Question

I am trying to set up a maxtrix keypad using the driver found here

Why are the matrix Rows supposed to be set as output ports here?

See GUS on Video!

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Ya this is not clear enough for me. I understand scanning a matrix in software but not how it correlates to rows and columns of buttons.

Maybe this will help you.


This seems like an improvement over the KP16 driver. Only one pin is used instead of 6. Is there an advantage to using an interrupt instead of polling?

Thank you!