说明：  液晶屏1602C的子程序，使用时只要把以下程序的端口改成自己需要的端口,建一个文件,然后把文件加在主程序的头文件里就可以了
(1602C LCD screen of the subroutine, use the following procedure as long as the port into the port to their own needs, to build a document, and then the document added to the main program the first document can be a)