On Tue, Aug 22, 2017 at 8:45 AM, afzal mohammed [off-list ref] wrote:

If a PWM IP is present on the chip, won't updating the PWM compare
registers within 10us (PWM @100KHz) achieve the required ?, toggling
delay & jitter shouldn't be a worry here, right ? (assuming PWM
compare registers can be updated every 10us using hrtimers)

There is timers on the cpu that can generate a PWM in hardware, but
what we need to do is update the PWM duty cycle every 10us (so the PWM
freq will be say 1MHz).  The idea is to ramp up/down the PWM value
over time (waveform generation).  I suppose if we could somehow feed
the capture/compare registers with DMA, that might work.  Gives me an
idea -- we should look into audio hardware and see if any of that can
generate a 100KHz waveform.

Cliff

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