说明：  字符型液晶显示器一般均采用HD44780及兼容芯片作为控制器，因此其接口方式基本是标准的。 为便于使用，编写了驱动程序软件包
(Character liquid crystal display generally used as the HD44780 and compatible chip controller, so the basic interface is a standard way. For ease of use, the preparation of the driver package)