STM32采用定时器管脚的输入捕获功能进行外部脉冲个数的采集，此代码仅采集脉冲个数，准确无误，用到的朋友下来看看，可检测编码器等PWM脉冲个数-STM32 timer pin input capture function for the acquisition of the external pulse number, this code is only collected the number of pulses, accurate, friend came down to see used