51单片机测试直流电机和步进电机的测试程序，包括直流电机正转、反转、调速、定时正反转和综合测试程序，步进电机的正转两相四拍、正转两相八拍，反向两相四拍、反转两相八拍，两相四拍两相八拍调速和步进电机综合程序。-51 single test DC motors and stepper motor test procedures, including DC motor forward, reverse, speed, time reversing and comprehensive test prog