pwm generation

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here's a working PWM module

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yes you can use a basic counter as such. Your design however expects a fixed freq generic but if freq is meant to be an input then you need to divide to get period cycles which can be avoided using accumulator.

accumulator approach additionally supports fractional clk/freq and not just integer result.

for a precision pwm (really precise) avoiding division is to use sine LUT + accumulator + comparator.