C51,用三路开关量输出控制三相步进电机，步进电机分别按单三拍，双三拍，六拍方式运行，编写步进电机正转、反转一周的控制软件-C51, with three-way switches control the output three-phase stepper motor, stepper motor, respectively, by a single three-shot, dual three-shot, six shot run, the preparation of stepper mo