On 11/04/2013 07:00 PM, Frank Bemelman wrote:
> Assume you have an interrupt every 57 uS.
>
>
> [untested code]
>
> int timervalue = 0;
> int msektimer = 0;
> .
> .
> .
>
> timer_int()
> { timervalue += 57; // add the uS that have passed since previous interrupt
> if(timervalue>1000) // a millisecond + some extra uS have past
> { timervalue -= 1000; // keep the remaining uS
> msektimer++; // keep track of total milliseconds
> }
> }
>
> Keeping track of seconds can be done in a similar way, just expand code.
> Sure there is some jitter on the timervalues, but a jitter of 57uS
> is usually not a problem for household purposes.
Clever. I have been thinking about slowing the interrupts down
dramatically but I can't generate a precise decimal time interval that
way. I'd been thinking about an algorithm but yours just solved it for
me. Thanks much
John
--
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