Originally Posted by
jonas2
RB7 on I put a led, for columns RB6 RB5 RB4 for
lines rb0 RB1 RB2 RB3.
OK, I think your problem is here, you set the TrisB to $F0 which in binary is 11110000, which sets the lower ports as outputs and the upper ports as inputs, so then you hang an LED on this PortB.7 input and it pulls it low. Change the Tris To $70 or %01110000, which will set the PortB.7 as an output. Better yet, put it back the way Bruce wrote it and move the LED to PortA otherwise, (although I am not sure), I think the keypad will not go over 7, I think if you want to "rob" portB of a port you must use one of the outputs not inputs.
Last edited by Archangel; - 10th July 2009 at 08:11.
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