Hi Tim,
I would probably insert an assembly routine to deal with that. I would chec=
k the bouncing of the switch on the scope and get a minimum debouncing time=
 and then create a loop which decrements a register until the time is reach=
ed, based on CLK used and number of instructions. So on the program every t=
ime a switch is pressed you jump to this routine and initiate count, when y=
ou exit the routine (time as been reached), check if switch is still presse=
d.
This is an easy way to do this but has the drawback that while you are doin=
g this you can not do anything else. The timer method you can go and do som=
ething else and generate an interrupt when time as been reached. Using the =
timer is the more elegant solution and you should definitely move in that d=
irection, but if you need the timer for something else and you are not worr=
ied about performance that much at the moment, then the loop solution will =
work.
Hope it helps =

Best regards
             Luis     =



-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of=
 Tom Sefranek
Sent: 03 April 2006 11:28
To: Microcontroller discussion list - Public.
Subject: Re: [PIC] debouncing in c

Tim Losereith wrote:

>Hello,
>
>I am looking for an example to debounce several push buttons in c. While =

>debouncing the micro shouldn=B4t be blocked by a timer.
>  =

>
SO use the HARDWARE timer!
(I do!)

Tom

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  |  __O    Thomas C. Sefranek   WA1RHP@ARRL.net
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