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Portenta: PWM on HRTIM has inverted corner case values #352

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@facchinm

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@facchinm

On Portenta H7, writing analogWrite(3, 255) results in a signal with 0% duty cycle, while analogWrite(3, 0) is 100%

analogWrite(3, n) , on the other hand, has exactly the expected duty (n/256)

See #351 (comment)

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