最近在调试fatfs文件体系，源代码是0.10a代码顺带参阅原子0.09的程序，我的代码中没有运用中文也便是_USE_LFN 设置为零，其次没有运用内存分配，sd_mmc.c是从fat32文件爱体系移植过来，能够正常播映MP3，我的主控是STM32F103RB芯片，移植完后，
在main里面如下
FATFS *fatfs;
FIL *file；
u32 *total;
u32 *free;
int main（）
｛
RESULT res;
bsp_init()；//初始化程序都在里面完结
res=sd_inti();
if(res)
{
printf(“init falier”);
}
else{//}
res=f_mount(fs,”0:”,1);
res=exfuns_getfree(“0”,total,free);
while(1);
｝
在调试中发现sd卡初始化成功，也便是回来值为零，
挂载也回来零，然后读取sd卡大小时
res回来12；
对应的值得意思是作业区没有。后来改成f_open（file,”0:123.txt”,FA_CREATE_ALWAYS|FA_CREATE_NEW）成果回来9，又说途径无效。
今晚回去好好看硬件spi有没有接反。
typedef enum {
FR_OK = 0,/* (0) Succeeded */
FR_DISK_ERR,/* (1) A hard error occurred in the low level disk I/O layer */
FR_INT_ERR,/* (2) Assertion failed */
FR_NOT_READY,/* (3) The physical drive cannot work */
FR_NO_FILE,/* (4) Could not find the file */
FR_NO_PATH,/* (5) Could not find the path */
FR_INVALID_NAME,/* (6) The path name format is invalid */
FR_DENIED,/* (7) Access denied due to prohibited access or directory full */
FR_EXIST,/* (8) Access denied due to prohibited access */
FR_INVALID_OBJECT,/* (9) The file/directory object is invalid */
FR_WRITE_PROTECTED,/* (10) The physical drive is write protected */
FR_INVALID_DRIVE,/* (11) The logical drive number is invalid */
FR_NOT_ENABLED,/* (12) The volume has no work area */
FR_NO_FILESYSTEM,/* (13) There is no valid FAT volume */
FR_MKFS_ABORTED,/* (14) The f_mkfs() aborted due to any parameter error */
FR_TIMEOUT,/* (15) Could not get a grant to access the volume within defined period */
FR_LOCKED,/* (16) The operation is rejected according to the file sharing policy */
FR_NOT_ENOUGH_CORE,/* (17) LFN working buffer could not be allocated */
FR_TOO_MANY_OPEN_FILES,/* (18) Number of open files > _FS_SHARE */
FR_INVALID_PARAMETER/* (19) Given parameter is invalid */
} FRESULT;
再次检查过硬件线没有接反！
