PWM

代码说明：

  闻亭TDS2407EA开发板的程序，采用通用定时器产生两路同频的PWM波形，重点调试的两路的相位差，也可以分别调整周期和占空比(Wintech TDS2407EA development board' s procedures, the use of two general purpose timers have the same frequency of the PWM waveform, the focus of debugging phase two, you can adjust the cycle and duty cycle, respectively,)