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238 lines
7.4 KiB
238 lines
7.4 KiB
/*---------------------------------------------------------------------------/
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/ Petit FatFs - FAT file system module include file R0.01a (C)ChaN, 2010
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/----------------------------------------------------------------------------/
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/ Petit FatFs module is an open source software to implement FAT file system to
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/ small embedded systems. This is a free software and is opened for education,
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/ research and commercial developments under license policy of following trems.
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/
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/ Copyright (C) 2010, ChaN, all right reserved.
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/
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/ * The Petit FatFs module is a free software and there is NO WARRANTY.
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/ * No restriction on use. You can use, modify and redistribute it for
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/ personal, non-profit or commercial use UNDER YOUR RESPONSIBILITY.
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/ * Redistributions of source code must retain the above copyright notice.
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/----------------------------------------------------------------------------*/
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#include "integer.h"
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/*---------------------------------------------------------------------------/
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/ Petit FatFs Configuration Options
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/
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/ CAUTION! Do not forget to make clean the project after any changes to
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/ the configuration options.
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/
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/----------------------------------------------------------------------------*/
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#ifndef _FATFS
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#define _FATFS
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#define _WORD_ACCESS 0
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/* The _WORD_ACCESS option defines which access method is used to the word
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/ data in the FAT structure.
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/
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/ 0: Byte-by-byte access. Always compatible with all platforms.
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/ 1: Word access. Do not choose this unless following condition is met.
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/
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/ When the byte order on the memory is big-endian or address miss-aligned
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/ word access results incorrect behavior, the _WORD_ACCESS must be set to 0.
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/ If it is not the case, the value can also be set to 1 to improve the
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/ performance and code efficiency. */
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#define _USE_DIR 0
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/* To enable pf_opendir and pf_readdir function, set _USE_DIR to 1. */
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#define _USE_LSEEK 0
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/* To enable pf_lseek function, set _USE_LSEEK to 1. */
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#define _FS_FAT32 1
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/* To enable FAT32 support, set _FS_FAT32 to 1. */
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/* End of configuration options. Do not change followings without care. */
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/*--------------------------------------------------------------------------*/
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#if _FS_FAT32
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#define CLUST DWORD
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#else
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#define CLUST WORD
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#endif
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/* File system object structure */
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typedef struct _FATFS_ {
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BYTE fs_type; /* FAT sub type */
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BYTE csize; /* Number of sectors per cluster */
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BYTE flag; /* File status flags */
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BYTE csect; /* File sector address in the cluster */
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WORD n_rootdir; /* Number of root directory entries (0 on FAT32) */
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BYTE* buf; /* Pointer to the disk access buffer */
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CLUST max_clust; /* Maximum cluster# + 1. Number of clusters is max_clust - 2 */
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DWORD fatbase; /* FAT start sector */
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DWORD dirbase; /* Root directory start sector (Cluster# on FAT32) */
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DWORD database; /* Data start sector */
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DWORD fptr; /* File R/W pointer */
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DWORD fsize; /* File size */
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CLUST org_clust; /* File start cluster */
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CLUST curr_clust; /* File current cluster */
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DWORD dsect; /* File current data sector */
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} FATFS;
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/* Directory object structure */
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typedef struct _DIR_ {
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WORD index; /* Current read/write index number */
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BYTE* fn; /* Pointer to the SFN (in/out) {file[8],ext[3],status[1]} */
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CLUST sclust; /* Table start cluster (0:Static table) */
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CLUST clust; /* Current cluster */
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DWORD sect; /* Current sector */
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} DIR;
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/* File status structure */
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typedef struct _FILINFO_ {
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DWORD fsize; /* File size */
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WORD fdate; /* Last modified date */
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WORD ftime; /* Last modified time */
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BYTE fattrib; /* Attribute */
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char fname[13]; /* File name */
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} FILINFO;
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/* File function return code (FRESULT) */
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typedef enum {
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FR_OK = 0, /* 0 */
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FR_DISK_ERR, /* 1 */
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FR_NOT_READY, /* 2 */
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FR_NO_FILE, /* 3 */
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FR_NO_PATH, /* 4 */
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FR_INVALID_NAME, /* 5 */
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FR_STREAM_ERR, /* 6 */
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FR_INVALID_OBJECT, /* 7 */
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FR_NOT_ENABLED, /* 8 */
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FR_NO_FILESYSTEM /* 9 */
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} FRESULT;
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/*--------------------------------------------------------------*/
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/* Petit FatFs module application interface */
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FRESULT pf_mount (FATFS*); /* Mount/Unmount a logical drive */
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FRESULT pf_open (const char*); /* Open a file */
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FRESULT pf_read (void*, WORD, WORD*); /* Read data from a file */
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FRESULT pf_lseek (DWORD); /* Move file pointer of a file object */
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FRESULT pf_opendir (DIR*, const char*); /* Open an existing directory */
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FRESULT pf_readdir (DIR*, FILINFO*); /* Read a directory item */
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/*--------------------------------------------------------------*/
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/* Flags and offset address */
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/* File status flag (FATFS.flag) */
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#define FA_READ 0x01
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#define FA_STREAM 0x40
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#define FA__ERROR 0x80
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/* FAT sub type (FATFS.fs_type) */
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#define FS_FAT12 1
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#define FS_FAT16 2
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#define FS_FAT32 3
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/* File attribute bits for directory entry */
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#define AM_RDO 0x01 /* Read only */
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#define AM_HID 0x02 /* Hidden */
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#define AM_SYS 0x04 /* System */
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#define AM_VOL 0x08 /* Volume label */
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#define AM_LFN 0x0F /* LFN entry */
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#define AM_DIR 0x10 /* Directory */
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#define AM_ARC 0x20 /* Archive */
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#define AM_MASK 0x3F /* Mask of defined bits */
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/* FatFs refers the members in the FAT structures with byte offset instead
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/ of structure member because there are incompatibility of the packing option
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/ between various compilers. */
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#define BS_jmpBoot 0
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#define BS_OEMName 3
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#define BPB_BytsPerSec 11
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#define BPB_SecPerClus 13
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#define BPB_RsvdSecCnt 14
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#define BPB_NumFATs 16
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#define BPB_RootEntCnt 17
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#define BPB_TotSec16 19
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#define BPB_Media 21
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#define BPB_FATSz16 22
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#define BPB_SecPerTrk 24
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#define BPB_NumHeads 26
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#define BPB_HiddSec 28
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#define BPB_TotSec32 32
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#define BS_55AA 510
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#define BS_DrvNum 36
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#define BS_BootSig 38
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#define BS_VolID 39
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#define BS_VolLab 43
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#define BS_FilSysType 54
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#define BPB_FATSz32 36
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#define BPB_ExtFlags 40
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#define BPB_FSVer 42
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#define BPB_RootClus 44
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#define BPB_FSInfo 48
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#define BPB_BkBootSec 50
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#define BS_DrvNum32 64
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#define BS_BootSig32 66
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#define BS_VolID32 67
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#define BS_VolLab32 71
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#define BS_FilSysType32 82
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#define MBR_Table 446
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#define DIR_Name 0
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#define DIR_Attr 11
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#define DIR_NTres 12
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#define DIR_CrtTime 14
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#define DIR_CrtDate 16
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#define DIR_FstClusHI 20
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#define DIR_WrtTime 22
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#define DIR_WrtDate 24
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#define DIR_FstClusLO 26
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#define DIR_FileSize 28
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/*--------------------------------*/
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/* Multi-byte word access macros */
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#if _WORD_ACCESS == 1 /* Enable word access to the FAT structure */
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#define LD_WORD(ptr) (WORD)(*(WORD*)(BYTE*)(ptr))
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#define LD_DWORD(ptr) (DWORD)(*(DWORD*)(BYTE*)(ptr))
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#define ST_WORD(ptr,val) *(WORD*)(BYTE*)(ptr)=(WORD)(val)
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#define ST_DWORD(ptr,val) *(DWORD*)(BYTE*)(ptr)=(DWORD)(val)
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#else /* Use byte-by-byte access to the FAT structure */
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#define LD_WORD(ptr) (WORD)(((WORD)*(BYTE*)((ptr)+1)<<8)|(WORD)*(BYTE*)(ptr))
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#define LD_DWORD(ptr) (DWORD)(((DWORD)*(BYTE*)((ptr)+3)<<24)|((DWORD)*(BYTE*)((ptr)+2)<<16)|((WORD)*(BYTE*)((ptr)+1)<<8)|*(BYTE*)(ptr))
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#define ST_WORD(ptr,val) *(BYTE*)(ptr)=(BYTE)(val); *(BYTE*)((ptr)+1)=(BYTE)((WORD)(val)>>8)
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#define ST_DWORD(ptr,val) *(BYTE*)(ptr)=(BYTE)(val); *(BYTE*)((ptr)+1)=(BYTE)((WORD)(val)>>8); *(BYTE*)((ptr)+2)=(BYTE)((DWORD)(val)>>16); *(BYTE*)((ptr)+3)=(BYTE)((DWORD)(val)>>24)
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#endif
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#endif /* _FATFS */
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