FATFS 初学之 f_chdir/ f_chdrive

详见：嵌入式大讲堂

 

 

 1 FRESULT f_chdir (
 2     const TCHAR *path    /* Pointer to the directory path */
 3 )
 4 {
 5     FRESULT res;
 6     DIR dj;
 7     DEF_NAMEBUF;
 8 
 9 
10     res = chk_mounted(&path, &dj.fs, 0);
11     if (res == FR_OK) {
12         INIT_BUF(dj);
13         res = follow_path(&dj, path);        /* Follow the path */
14         FREE_BUF();
15         if (res == FR_OK) {                    /* Follow completed */
16             if (!dj.dir) {
17                 dj.fs->cdir = dj.sclust;    /* Start directory itself */
18             } else {
19                 if (dj.dir[DIR_Attr] & AM_DIR)    /* Reached to the directory */
20                     dj.fs->cdir = LD_CLUST(dj.dir);
21                 else
22                     res = FR_NO_PATH;        /* Reached but a file */
23             }
24         }
25         if (res == FR_NO_FILE) res = FR_NO_PATH;
26     }
27 
28     LEAVE_FF(dj.fs, res);
29 }

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