采用单片机与片外可编程计数/定时器协同工作来实现步进电机的调速,通过Atmega16型单片机输出高低电平控制步进电机的正、反向-Using SCM and chip programmable counter/timers work together to achieve the stepper motor speed control, through high and low output Atmega16 MCU controlled stepper motor forward and reverse