这个是51单片机大学实验中很重要的一个实验，一般上课时老师都不会直接给出源码，需要自己编写，为了让大家更好的掌握这个重要内容，我把自己编写的代码和实验指导书发给大家，键盘是4*4键盘，靠LED显示屏输出！-This is a very important experiment in the 51 microcontroller University experiment, and general class teachers will not be directly given source, you need to write your own, in order to give you a better grasp of this important content, I write code and experiment instructions distributed to you, the keyboard is a 4* 4 keyboard, relying on the LED display output!