I'm working on a Timer1-based project where a button should serve
three purposes: start the timer, stop the timer, reset the timer.
Implementing the start/stop alone is easy (TMR1ON = 1 ^ TMR1ON), but
I'm having serious problems figuring out how I can implement the reset
as well.

What I have been playing around with is Timer0. As soon as RA0 is
pressed T0IE is set (cleared when RA0 is released), and the ISR counts
overflows. Later I have made logic based on the amount of
TMR0-overflows.

This is how I want it to behave:

* (If RA0 is pressed) AND (Timer1 is stopped) AND (overflows > 50)  =>  reset
* (If RA0 is pressed) AND (either state of Timer1) AND ( 0 < overflows
< 5) => TMR1ON = 1 ^ TMR1ON

(50 overflows is a couple of seconds - no need to be exact)

I have implemented both of these but I cannot make them work together.
Been wasting(?) two hours on this so I can't really think straight any
longer.

Does anyone have suggestions for another approach other than use Timer0?


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- Rikard - http://bos.hack.org/cv/
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