实现测量脉冲信号的周期，脉冲持续时间，占空比等功能，进而通过脉冲周期获得电机转速的测量，以实现实时监控电机转速的目的。-Measure the pulse signal cycle, pulse duration, duty cycle, and other functions, and then measuring the rotational speed of motor through pulse cycle, in order to realize the purpose of real