4x4 matrix keypad with interrupts

delene · Joined: 13 Oct 2003 Posts: 32

Hi

I have a 4x4 keypad connected to portb with the pull ups enabled. Previously I had been checking the keypad in my main code, but now would like to change my code to use interrupts rather.
I tried int_rb, but couldn't come right
I then tried int_rtcc - and didn't come right.
I now have timer1 enabled and it is occassionally reading the keypad.

Is this the best way of trying to read the keypad through interrupts?

I am using a pic18f4523
My crystal is 20MHz

and timer1 is setup as follows

dyeatman · Joined: 06 Sep 2003 Posts: 1924 Location: Norman, OK

In Search enter the three words: keypad, matrix and interrupts then set to "Search for All terms" and you will find this:

http://www.ccsinfo.com/forum/viewtopic.php?t=40982&
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PCM programmer · Joined: 06 Sep 2003 Posts: 21708

This thread has sample code for polling the keypad every 10ms inside
the Timer0 interrupt routine:
http://www.ccsinfo.com/forum/viewtopic.php?t=45935

delene · Joined: 13 Oct 2003 Posts: 32

Thanks Everyone

I eventually came right. I used this code

http://www.ccsinfo.com/forum/viewtopic.php?t=19726