说明：  本程序写了LCM1602液晶的头文件制作，使用者可直接用#include调用此头文件写一个主函数就可以了，调用函数可参考头文件，经调试成功
(This procedure was the first LCD LCM1602 document production, the user can directly use# include the header file to call a main function to write it, call the function may refer to header files, after the successful commissioning)