stm32+sdio+fatfs文件系统 源码分析

ry object linked to the file name */

)//

FRESULT dir_read (

DIR *dj /* Pointer to the directory object that pointing the entry to be read */

)

FRESULT dir_register ( /* FR_OK:Successful, FR_DENIED:No free entry or too many SFN collision, FR_DISK_ERR:Disk error */

DIR *dj /* Target directory with object name to be created */

)

FRESULT dir_remove ( /* FR_OK: Successful, FR_DISK_ERR: A disk error */

DIR *dj /* Directory object pointing the entry to be removed */

)

//以上这些函数都是对目录项的操作函数。

FRESULT create_name (

DIR *dj, /* Pointer to the directory object */

const XCHAR **path /* Pointer to pointer to the segment in the path string */)

//这个函数太长了，具体用到的时候再说吧。

void get_fileinfo ( /* No return code */

DIR *dj, /* Pointer to the directory object */

FILINFO *fno /* Pointer to store the file information */)

该函数用于获取文件状态信息。主要是从文件的目录项中获取信息。

FRESULT follow_path ( /* FR_OK(0): successful, !=0: error code */

DIR *dj, /* Directory object to return last directory and found object */

const XCHAR *path /* Full-path string to find a file or directory */

)

该函数给定一个全路径，得到相应的目录对象。

BYTE check_fs ( /* 0:The FAT boot record, 1:Valid boot record but not an FAT, 2:Not a boot record, 3:Error */

FATFS *fs, /* File system object */

DWORD sect /* Sector# (lba) to check if it is an FAT boot record or not */)

该函数用于读取BOOT扇区，检查是否FAT文件系统。

FRESULT auto_mount ( /* FR_OK(0): successful, !=0: any error occured */

const XCHAR **path, /* Pointer to pointer to the path name (drive number) */

FATFS **rfs, /* Pointer to pointer to the found file system object */

BYTE chk_wp /* !=0: Check media write protection for write access */)

这个函数的功能不太明白。

FRESULT validate ( /* FR_OK(0): The object is valid, !=0: Invalid */

FATFS *fs, /* Pointer to the file system object */

WORD id /* Member id of the target object to be checked */

)//检查是否合法的文件系统。

FRESULT f_mount (

BYTE vol, /* Logical drive number to be mounted/unmounted */

FATFS *fs /* Pointer to new file system object (NULL for unmount)*/)

这是一个很重要的函数，装载文件系统。也是从这个函数开始，对外输出供用户调用。

if (vol >= _DRIVES)现在只支持卷号0.

FatFs[vol] = fs;将参数文件系统对象指针赋给全局文件对象指针。

后面的函数主要是对文件和目录进行操作，这里就不一一例举了。