這幾天在移植FATFS檔案系統，在移植過程中需要新建資料夾下建立新的cfg檔案，查詢資料後發現需要用到以下函式：

f_mkdir("0:/2017110223");//新建資料夾，其中2017110223是資料夾名稱

f_open(filescr1, "0:2017110223/201711011.txt", FA_OPEN_NEW_COVER);//在新建的資料夾下建立新的txt文字檔案

新建完成之後要記得關閉該檔案，否則就會出錯。

f_res = f_close(filescr1);

在移植FATFS檔案系統的時候我們可以用隨時檢視檔案操作函式的返回值，針對這些返回值都有特定的意義，針對這些返回值我們可以很快鎖定問題。

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;