这是一个步进电机正反转和加速减速c源程序，能够实现单4拍正转和单4拍反转，双4拍正转和双4拍反转，以及单双8拍正转和单双8拍反转。-This is a source code in step into the motor. It can complete turn and down. And the various to form four and take the form 4 to take back, take the four