本程序实现的是对步进电机的控制，主控机是AVR单片机，外圈有四个按键，功能分别为：加速、减速、正反转选择、励磁方式选择-This procedure is implemented to control stepper motors, the host computer is the AVR microcontroller, the outer ring has four key functions are: acceleration, deceleration, Reversible choic