FTAFS移植f_mount 挂载成功f_open失败问题（1）
在main里边如下
本文引用地址：//m.amcfsurvey.com/article/201611/322275.htmFATFS *fatfs;
FIL *file；
u32 *total;
u32 *free;
int main（）
｛
RESULT res;
bsp_init()；//初始化程序都在里边完成
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，也就是返回值为零，
挂载也返回零，然后读取sd卡大小时
res返回12；
对应的值得意思是工作区没有。后来改成f_open（file,"0:123.txt",FA_CREATE_ALWAYS|FA_CREATE_NEW）结果返回9，又说路径无效。
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;
再次查看过硬件线没有接反！
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