说明：  STM32的PWM输出模式，STM32的TIM1模块是增强型的定时器模块，天生就是为电机控制而生，可以产生3组6路PWM，同时每组2路PWM为互补，并可以带有死区，可以用来驱动H桥。
(STM32' s PWM output mode, STM32' s TIM1 module is enhanced timer module, is inherently for the motor control, it can produce three groups 6-channel PWM, while the complementary PWM each 2-way, and can be with the dead zone, can be used to drive H-bridge.)