> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Rikard Bosnjakovic
> Sent: 01 April 2009 15:39
> To: Microcontroller discussion list - Public.
> Subject: [PIC] One button, three purposes
> 
> 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?

Just to clarify, are you using the overflow counter to check how long
the button is pressed, so a short press starts or stops the timer, and a
long press resets it?

Regards

Mike

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