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Measuring a signal frequency

You need to measure the frequency of a 0 to 20 kHz square wave from a flow sensor accurately with little CPU load. What is the best approach?

A.Poll the GPIO in the main loop and count changesB.Sample the pin with the ADC at 1 kHzC.Use a timer in input capture mode to record the counter value on each rising edgeD.Call a 1 ms delay and read the pin after each delay

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Measuring a signal frequency

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