> >> Easy method: check the buttons only each xxx ms.
> >>
> > You know this is dead simple, and I cannot think of any criticism of
> > it.  Nobody has commented otherwise, have they?
> 
> It more-or-less require that you have a timer interrupt available,

Absolutely not. I very very seldom use interrrupts at all, and if I use
interrupts it is to simulate some peripheral, like a UART with a FIFO
buffer. User interaction IMHO belongs in the main loop. I often use 10
or 50 ms as the main loop cycle time. I that cycle time is fatsre than
the debounce time, I simply check the buttons once in N loops.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
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