51开发板源程序,74HC595驱动显示程序.在该模块中，共有4位LED，采用74HC595驱动显示.-51 Development Board source, Bit-driven display program. In this module, A total of four LED, using 74 HC595-driven show.

74hc595操作子程序，可以直接调用，互相学习，多多指教-74hc595 operation subroutine, you can directly call each other and learn from the exhibitions