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Read PWM input without TIM

Question asked by livianamj on Apr 30, 2014
Latest reply on Apr 30, 2014 by Clive One
Excuse me, I want to ask, can I know duty cycle of PWM without using TIM? I thought if I can read the time of PIN either in high or low logic and then divided by period. So I can measure the duty cycle. Assumption : I know the frequency of PWM input, so I can determine the period at first. 

Thank you very much.