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Originally Posted by Kevin Watson
The problem is that PWM channels 13-16 are "bit banged" by code running on the user processor. When you have a lot of interrupts firing-off in the background, IFI's code get's interrupted while running, which causes jitter in the outputs. The only solution is to not use PWMs 13-16.
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That's rather what I suspected. I'll try having the guys shuffle around the PWMs.