AVR-Chat

Is there an assembly language version of that?

Zack

On Tue, Nov 3, 2009 at 4:19 AM, Marc R.J. Brevoort <mrjb@dnd.utwente.nl>wrote:

>
>
> Hi Erik,
>
>
> > Who ever came up with this orignally was a frickin' genius.
> > Sure, it's for PIC but the code is in C.
> > A little helpful cut-n-paste to give you the basic idea.
> >
> > ;static unsigned clock_A,clock_B,debounced_state;
> > ;unsigned debounce(unsigned new_sample)
> > ;{
> > ; unsigned delta;
> > ; unsigned changes;
> > ;
> > ; delta = new_sample ^ debounced_state; //Find all of the changes
> > ;
> > ; clock_A ^= clock_B; //Increment the counters
> > ; clock_B = ~clock_B;
> > ;
> > ; clock_A &= delta; //Reset the counters if no changes
> > ; clock_B &= delta; //were detected.
> > ;
> > ; changes = ~(~delta | clock_A | clock_B);
> > ; debounced_state ^= changes;
> > ;
> > ; return changes;
> > ;} /* debounce */
> > ;
> >
> > The cool thing is that this can debounce a whole port at once. It
> > runs in an interrupt routine.
>
> Thanks. I've got a single button debounce by now, but this one is
> quite nice due to its multi-input nature. I've saved it to my favs for
> future reference.
>
> Best,
> Marc
>
> 
>


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