stm32基于定时器对PWM频率进行修改，以此控制步进电机，做到步进电机速度可调，只做了加速减速没有做，原理相同，实测可用(STM32 based on the timer to modify the frequency of PWM, in order to control the stepper motor, so that stepper motor speed adjustable, only to do the acceleration deceleration, did not do

实现用单片机定时器对输出脉冲的计数以及加减速对步进电机进行控制 亲测好用(It can count the output pulse with the timer of single chip microcomputer and control the stepping motor with acceleration and deceleration)