基于51单片机的液晶R61509V驱动程序，并以此 为基础构建了相关GUI，实现画点画线画面以及ASCII码显示，信实现基于SD卡FAT32文件系统字库文件的汉字显示功能，有4种字号大小的选择-Based on 51 single-chip LCD R61509V driver, and as a basis to build the relevant GUI, to achieve stipple line display screen and the ASCII code, the lett