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

stm32 pwm 通过函数接口控制占空比和周期，只是一个.C文件，但是非常好加到工程里面。-stm32 pwm duty cycle and cycle through a function interface control, just a C file, but added to the project inside very good.