I am using a simple 4 by 4 matrixed keypad, and I would like to handle some of the decoding myself. In essence, I would like to configure all 4 rows as low driven output pins and have the sd handle the 4 column inputs as though they were single buttons. Then, in the button event handler, I'd like to change the configuration of the rows to inputs with pull-ups, drive the columns low, and read the row inputs. After doing the decoding, I'll restore the original configuartion, i.e columns input with pull-ups, rows driven low. So nothing clever, just one of the standard ways of reading a simple matrix. My question is will this work, or will I need to disable the button_handler for the duration of the event handler by some means?
The alternative would be for me to configure a timer event and do the scanning manually, but I'm not sure which method would result in the lower power consumption.
