U盘MP3下的文件系统(完全兼容FAT16/FAT32)
源代码在线查看： fat.h
/*H**************************************************************************
* NAME: fat.h
*----------------------------------------------------------------------------
* Copyright (c) 2003 Atmel.
*----------------------------------------------------------------------------
* RELEASE: snd1c-refd-nf-4_0_3
* REVISION: 1.15
*----------------------------------------------------------------------------
* PURPOSE:
* FAT16/FAT12 file-system basic functions definition
*****************************************************************************/
#ifndef _FAT_H_
#define _FAT_H_
/*_____ I N C L U D E S ____________________________________________________*/
/*_____ M A C R O S ________________________________________________________*/
/*----- FAT Configuration -----*/
#define FAT_PARTITIONNED TRUE /* TRUE: format with 1 partition,
FALSE: without partition */
#define READ ((bit)0)
#define WRITE ((bit)1)
#define FREE_CLUSTER ((Uint16)0x0000) /* free cluster value in FAT */
#define LAST_CLUSTER12 ((Uint16)0x0FFF) /* last file cluster in FAT 12 */
#define BAD_CLUSTER12 ((Uint16)0x0FF7) /* bad cluster value in FAT 12 */
#define LAST_CLUSTER16 ((Uint16)0xFFFF) /* last file cluster in FAT 16 */
#define BAD_CLUSTER16 ((Uint16)0xFFF7) /* bad cluster value in FAT 16 */
#define MBR_ADDRESS ((Uint32)0) /* Master Boot Record address */
#define ATTR_FILE ((Byte)0x00) /* Normal File Attribute */
#define ATTR_READ_ONLY ((Byte)0x01) /* Read Only File Attribute */
#define ATTR_HIDDEN ((Byte)0x02) /* Hidden File Attribute */
#define ATTR_SYSTEM ((Byte)0x04) /* System File Attribute */
#define ATTR_DIRECTORY ((Byte)0x10) /* Directory Attribute */
#define ATTR_ARCHIVE ((Byte)0x20) /* Archive Attribute */
#define ATTR_LFN_ENTRY ((Byte)0x0F) /* LFN entry attribute */
#define ATTR_ROOT_DIR ((Byte)0x90) /* internal use only */
#define PARTITION_ACTIVE ((Byte)0x80) /* the active partition state */
#define FILE_NOT_EXIST ((char)0x00) /* current file does not exist */
#define FILE_DELETED ((char)0xE5) /* current file is deleted */
#define LFN_SEQ_MASK ((Byte)0x3F) /* LFN sequence number mask */
#define ODD_EVEN_MASK ((Byte)0x01) /* the odd / even test mask */
#define FAT12 ((Byte)0x01) /* FAT12 type */
#define FAT16_INF32M ((Byte)0x04) /* FAT16 type < 32 Mbytes */
#define FAT16_SUP32M ((Byte)0x06) /* FAT16 type > 32 Mbytes */
#define FAT32 ((Byte)0x0B) /* FAT32 type not supported */
#define MAX_CLUSTERS12 ((Uint16)4084) /* FAT12 if < FAT16 else */
#define MAX_CLUSTERS16 ((Uint16)65524) /* FAT16 if < FAT32 else */
/* Format Info */
#define SECTOR_SIZE ((Uint16)512) /* supported sector size */
#define DIR_SIZE ((Byte)32) /* directory entry size */
#define NB_ROOT_ENTRY ((Uint16)512)
#define NB_RESERVED ((Byte)1) /* number of reserved sectors */
#define NB_FATS ((Byte)2)
#define HARD_DISK ((Byte)0xF8) /* hard disk device */
#define FAT_DRIVE_NUMBER ((Byte)0x81)
#define FAT_EXT_SIGN ((Byte)0x29)
#define BR_SIGNATURE ((Uint16)0xAA55) /* boot record signature */
#define MBR_ADDRESS ((Uint32)0) /* master boot record address */
/* FAT definition */
/* For LFN name, the name will be build with MAX_LFN_ENTRIES entries */
/* That means tha the max file name length is */
/* 12 + (MAX_LFN_ENTRIES - 1 ) * 13 */
/* Size in pdata zone is 256 bytes. */
/* gl_buffer use 32 bytes in pdata */
/* We need 15 bytes for scrolling display */
/* Maximum size for LFN name is 256 - 32 - 15 = 209 bytes */
/* And so MAX_LFN_ENTRIES = (209 - 12) / 13 + 1 = 16 */
/* And size of LFN string is */
/* MAX_FILENAME_LEN = 12 + (MAX_LFN_ENTRIES - 1) * 13 + 15 + 1 + 1 */
/* | | */
/* +1 because we start at 0 - | */
/* +1 for '\0' character ----- */
/* maximum number of LFN entries */
#define MAX_LFN_ENTRIES ((Byte)16)
/* maximum file name length */
#define MAX_FILENAME_LEN ((Byte)(12 + (MAX_LFN_ENTRIES - 1) * 13 + 15 + 1 + 1))
#define MAX_FILE_FRAGMENT_NUMBER ((Byte)150)/* maximum number of authorized
/* fragment for a file */
#define MAX_DIR_FRAGMENT_NUMBER ((Byte)5) /* maximum number of authorized
/* fragment for a directory */
#define MAX_DIRECTORY_FILE ((Uint16)512) /* maximum number of file in */
/* a directory */
//#define MAX_DIRECTORY_GAP_FILE ((Uint16)(65535))
#define MAX_DIRECTORY_GAP_FILE ((Byte)(255))
/* maximum delta between 2 */
/* specified entries */
/* Can be replace 255 or 65535 */
/* case of type used for */
/* fat_directory_chain */
#define DEL_RET_OK (Byte)(0)
#define DEL_RET_NO_MORE_FILE (Byte)(1)
#define DEL_RET_ERROR_DIR (Byte)(2)
/*******************************************************************************
* PURPOSE:
* FAT Directory Entry structure
*******************************************************************************/
typedef struct
{
Byte attributes; /* Attributes bits */
/* Here could stand times variables, unused ... */
Uint16 start_cluster; /* Starting cluster number */
Union32 size; /* File size in bytes */
} fat_st_dir_entry;
/*******************************************************************************
* PURPOSE:
* FAT cache of parent directory and current file or directory
*******************************************************************************/
typedef struct
{
fat_st_dir_entry parent; /* parent directory */
fat_st_dir_entry current; /* current file/directory info */
} fat_st_cache;
/*******************************************************************************
* PURPOSE:
* FAT cluster chain structure (each index is a fragment of the file)
*******************************************************************************/
typedef struct
{
Uint16 cluster; /* starting cluster of fragment */
Byte number; /* number of subsequent clusters in fragment */
} fat_st_clust_chain;
#define MAX_CL_PER_FRAG ((0x01
/*******************************************************************************
* PURPOSE:
* FAT free space
*******************************************************************************/
typedef struct
{
Uint32 free_cluster; /* number of free cluster */
Byte cluster_size; /* cluster size in sector */
} fat_st_free_space;
/******************************************************************************
* PURPOSE :
* FAT fs functions
******************************************************************************/
bit fat_get_root_directory (Byte id);
bit fat_goto_next (void);
bit fat_goto_prev (void);
bit fat_seek_last (void);
bit fat_seek_first (void);
bit fat_goto_parentdir (Byte id);
bit fat_goto_subdir (Byte id);
bit fat_fopen (bit);
void fat_fclose (void);
bit fat_fcreate (char *, Byte);
void fat_refresh_dir_file_info (Byte);
Byte fat_fdelete (void);
Byte fat_fgetc (void);
void fat_fputc (Byte);
bit fat_feof (void);
bit fat_fseek (Int32);
void fat_fseek_abs(Uint32);
void fat_format (void);
fat_st_free_space fat_free_space (void);
Byte fat_check_ext (void);
bit fat_install (void);
Uint32 fat_file_get_pos(void);
bit fat_feob(void);
void fat_save_cluster_info(void) ;
char pdata * fat_get_name (void);
void fat_clear_file_name(void);
#endif /* _FAT_H_ */
