> By dithering duty cycle on a 1-instruction basis, resolution can average
to
> much better than 1-instruction times, if the averaging period is long.
>
> Here's a simple adaptive algorithm:
>
> 1. Start an accumulator on duty cycle during the averaging period, or a
> moving average across periods.
>
> 2. If accumulator/average is low, turn on duty cycle.
>
> 3. If accumulator/average is low, turn off duty cycle.

Bresenham's algorithm seems appropriate since it was originally developed as
a higher speed alternative to this sort of slope/accumulator calculation.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@embedinc.com, http://www.embedinc.com

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