用TIM3定时器在PA6、PA7、PB0、PB1输出四种频率相同占空比分别是50 、37.5 、25 、12.5 的信号。 用TIM2的PWM_Input功能，从PA1口捕获PWM信号的频率及占空比，并用USART1输出测量信息。-At TIM3 timer with PA6, PA7, PB0, PB1 output frequency of the same four are 50 duty cycle, respectively, 37.5 , 25 , 12.5 of the

这是我的程序，用来是实时测量由遥控器发出的pwm波的正脉冲的长度。pwm波70hz，正脉冲的长度可以从2.1ms到0.9ms之间调整。-This is the procedure I used is real-time measurement issued by the remote control pwm pulse wave length is. pwm wave 70hz, is the length of pulse can be adjusted between 2.1ms to 0.