C51写的单片机串口通信程序,用于键盘测试和USB接口测试!-C51 microcontroller serial communication procedures for testing and USB keyboard interface test!

89C51的矩阵键盘扫描程序，很好的程序呢，我试过了，还是我的作业呢。通俗易懂，希望对你有帮助。-89 C51 matrix keypad scanning program, very good program? I tried, or my homework. Easy to understand, the hope is helpful to you.

关于USB键盘的C51源代码,软件工程师可以参考下-About USB keyboard C51 source code, software engineers can refer to the next