51单片机程序，此程序用于4相步进电机常规驱动，使用1-2相励磁，数码管显示，3-19速度等级-51 single-chip program, the program routine for the 4-phase stepper motor drive, using 1-2 phase excitation, digital display, 3-19 speed grade

51单片机数码管计数器ASM小程序,可实现到0~99秒的计数功能，并且启动时长按也可计数-51 single digital counter ASM applet can be realized to 0 ~ 99 seconds of counting function, and starts long press can also be counted