通过FATFS文件系统方式读取SD卡上的.TXT格式小说内容，显示于320*480高清TFT上 -By FATFS file system read SD card. TXT format, novel in 320* 480 high clear TFT display

linux驱动编写，实现外接sd卡功能，实现fafts文件系统，并包含电路图-Linux driver to write, to achieve external SD card function, to achieve fafts file system, including the circuit diagram