步进电机给学生（提供了proteus仿真步进电机的C代码，步进电机的转速通过延时函数实现，实现了正转反转，单3拍，双3拍，4相8拍）-Stepper motor to students (provided the proteus simulation C code of stepper motor, stepper motor speed by delay function, positive inversion, three single, double, 3 four phase eight clap) stepping motor to students (provided the proteus simulation C code of stepper motor, stepper motor speed by delay function, positive inversion, three single, double three shots, four phase eight clap)