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（一）下载FATFS源码
说明：共有8个文件diskio.c和diskio.h是硬件层，ff.c和ff.h是FatFs的文件系统层和文件系统的API层，integer.h是文件系统所用到的数据类型的定义，tff.c和tff.h是Tiny的文件系统层和文件系统的API层
（二）修改FATFS
主要修改底层设备驱动函数：diskio.c
目的：就是把 diskio.c 中的函数接口与SPI Flash
芯片驱动连接起来。总共有五个函数，分别为设备状态获取(disk_status)、设备初始化(disk_initialize)、扇区读取(disk_read)、扇区写入(disk_write)、其他控制(disk_ioctl)。
还有修改ffconf.h
目的：根据需求来配置ffconf.h里面的宏定义
（三）挂在文件系统
1.创建一些对象
FATFS fs; /* FatFs文件系统对象 /
FIL fnew; / 文件对象 /
FRESULT res_flash; / 文件操作结果 /
UINT fnum; / 文件成功读写数量 */
2.文件系统的挂在
//在外部SPI Flash挂载文件系统，文件系统挂载时会对SPI设备初始化
res_flash = f_mount(&fs,“1:”,1);
如果没有文件系统就格式化创建文件系统
/* 如果没有文件系统就格式化创建创建文件系统 /
if(res_flash == FR_NO_FILESYSTEM)
{
/ 格式化 */
res_flash=f_mkfs(“1:”,0,0);
if(res_flash == FR_OK) { /* 格式化后，先取消挂载 */ res_flash = f_mount(NULL,"1:",1);
/* 重新挂载 */ res_flash = f_mount(&fs,"1:",1); }
}
（四）文件系统：写入
1.先打开文件
res_flash = f_open(&fnew, “1:FatFs读写测试文件.txt”,FA_CREATE_ALWAYS | FA_WRITE );
//不存在就创建一个
2.将存储区的内容写入文件内
res_flash=f_write(&fnew,WriteBuffer,sizeof(WriteBuffer),&fnum);
3.关闭文件
f_close(&fnew);
（五）文件系统：读出
1.打开文件
res_flash = f_open(&fnew, “1:FatFs读写测试文件.txt”, FA_OPEN_EXISTING | FA_READ);
2.将文件内容读取到缓冲区
res_flash = f_read(&fnew, ReadBuffer, sizeof(ReadBuffer), &fnum);
3.关闭文件
f_close(&fnew);
