Re: [avr-gcc-list] Simple question

[Lorne Gutz]

On Monday 31 March 2003 04:24, Mark Williams (MWP) wrote:
> A very basic question... im just having one of those days where i cant see
> the obvious answer.
>
> I want to do somthing like:
>
> u16 counter=0;

this must be volatile

> void main(void)
> {
>       u16 delay ;
      set delay = some constant.

>       while(1)
>       {
>               if (counter >= delay)
>               {
>                       //do stuff
>                       delay = counter + 1000;
        then here set counter = 0;  instead of the above.

>               }
>       }
> }
>
> INTERRUPT(SIG_OUTPUT_COMPARE2)
> {
>       counter++;
> }
>
> But obviously this wont handle counter overflows too well.  Whats the best
> way to deal with the overflows, so that the delay still functions properly?
>  I only want to have the counter increment in the INT as itll be running
> rather fast, and will chew too much processor time if i start putting
> compares in there.
>
> Thanks for any tips.
> Mark.
>
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