fat.h

nec16位单片机读U盘播放MP3源码

typedef struct _MBR_BLOCK {                                   //////////512bytes
  INT8 Res[454];
  unsigned long StartSector;//分区起始扇区数
  unsigned long TotalSector;//分区总扇区数
  INT8 Res1[50];
} MBR_BLOCK,* PMBR_BLOCK;

typedef struct _BPB_BLOCK {                                /////////////512bytes
  INT8 BS_jmpBoo[3];  //Ofs:0,典型的如0xEB,0x3E,0x90
  INT8 BS_OEMName[8];//Ofs:3,如MSWIN41
  INT16 BPB_BytesPerSec;//Ofs:11 每扇区字节数
  INT8 BPB_SecPerClus;//Ofs:13没簇扇区数
  INT8 BPB_RsvdSecCn[2];
  //INT16 BPB_RsvdSecCn;//Ofs:14 保留扇区数，从DBR到FAT的扇区数
  INT8 BPB_NumFATs;
  INT16 BPB_RootEntCnt;
  INT16 BPB_TotSec16;
  INT8 BPB_Media;
  INT16 BPB_FATSz16;
  INT16 BPB_SecPerTrk;
  INT16 BPB_NumHeads;
  unsigned long BPB_HiddSec;
  unsigned long BPB_TotSec32;
  INT8 BS_DrvNum;
  INT8 BS_Reserved1;
  INT8 BS_BootSig;
  INT8 BS_VolID[4];
  INT8 BS_VolLab[11];
  INT8 BS_FilSysType[8];
  INT8 ExecutableCode[448];
  INT8 Marker[2];
} BPB_BLOCK,* PBPB_BLOCK;

typedef struct _BPB32_BLOCK {                                /////////////512bytes
  INT8 BS32_jmpBoo[3];  
  INT8 BS32_OEMName[8];
  INT16 BPB32_BytesPerSec;
  INT8 BPB32_SecPerClus;
  INT8 BPB32_RsvdSecCn[2];
  INT8 BPB32_NumFATs;
  INT16 BPB32_RootEntCnt;
  INT16 BPB32_TotSec16;
  INT8 BPB32_Media;
  INT16 BPB32_EMPTY;
  INT16 BPB32_SecPerTrk;
  INT16 BPB32_NumHeads;
  unsigned long BPB32_HiddSec;
  unsigned long BPB32_TotSec32;
  unsigned long BPB32_FATSz32;
  INT16 BPB32_ExternFlag;
  INT16 BPB32_FileSYSVer;
  unsigned long RootClsNum;
  INT8 ExecutableCode[464];
} BPB32_BLOCK,* PBPB32_BLOCK;


typedef struct _SYS_INFO_BLOCK{                    ////////68bytes
  unsigned long StartSector;
  unsigned long TotalSector;
  //INT8 BS_jmpBoo[3];
  //INT8 BS_OEMName[8];
  INT16 BPB_BytesPerSec;
  INT8 BPB_SecPerClus;
  //INT8 BPB_RsvdSecCn[2];
  INT8 BPB_NumFATs;
  INT16 BPB_RootEntCnt;
  INT16 BPB_TotSec16;
  INT8 BPB_Media;
  INT16 BPB_FATSz16;
  INT16 BPB_SecPerTrk;
  INT16 BPB_NumHeads;
  unsigned long BPB_HiddSec;
  unsigned long BPB_TotSec32;
  unsigned long BPB_FATSz32;///////////////////////fat32 add
  INT8 BS_DrvNum;
  //INT8 BS_Reserved1;
  INT8 BS_BootSig;
  INT8 BS_VolID[4];
  INT8 BS_VolLab[11];
  INT8 BS_FilSysType[8];
  //INT8 ExecutableCode[448];
  //INT8 Marker[2];
  ///////////////////////////////
  unsigned long FatStartSector;
  unsigned long RootStartSector;
  //unsigned long DataStartSector;
  unsigned long FirstDataSector;
  //unsigned long FirstSectorofCluster;
} SYS_INFO_BLOCK,* PSYS_INFO_BLOCK;

typedef struct _FILE_INFO{                                        ////////22bytes
  unsigned char bFileOpen;
  unsigned int StartCluster;
  unsigned long LengthInByte;
  unsigned int ClusterPointer;
  unsigned long SectorPointer;
  unsigned int OffsetofSector;
  unsigned char SectorofCluster;
  unsigned long pointer;
  unsigned int	FatSectorPointer;
} FILE_INFO, * PFILE_INFO;

typedef struct _FILE32_INFO{                                        ////////22bytes
  unsigned char bFileOpen;
  unsigned long StartCluster;
  unsigned long LengthInByte;
  unsigned long ClusterPointer;
  unsigned long SectorPointer;
  unsigned long OffsetofSector;
  unsigned char SectorofCluster;
  unsigned long pointer;
  unsigned int	FatSectorPointer;
} FILE32_INFO, * PFILE32_INFO;


typedef struct _FREE_FAT_INFO{                                        ////////10bytes
  unsigned long SectorNum;
  unsigned int OffsetofSector;
  unsigned long OldSectorNum;
} FREE_FAT_INFO, * PFREE_FAT_INFO;

typedef struct _DIR_INFO{                                    ///////////32bytes
	unsigned char name[8];
	unsigned char extension[3];
	unsigned char attribute;
	unsigned char Reserved[10];
	unsigned int lastUpdateDate;
	unsigned int lastUpdateTime;
	unsigned int startCluster;
	unsigned long length;
} DIR_INFO,* PDIR_INFO;

typedef struct _DIR32_INFO{                                    ///////////32bytes
	unsigned char name[8];
	unsigned char extension[3];
	unsigned char attribute;
	unsigned char Reserved;
	unsigned char time10ms;
	unsigned int filesettime;
	unsigned int filesetday;
	unsigned int fileaccessday;
	unsigned int high16Cluster;
	unsigned int lastUpdateTime;
	unsigned int lastUpdateDate;
	unsigned int low16Cluster;
	unsigned long length;
} DIR32_INFO,* PDIR32_INFO;

unsigned long FirstSectorofCluster(unsigned int n);
unsigned int ThisFatSecNum(unsigned int clusterNum);
unsigned int ThisFatEntOffset(unsigned int clusterNum);
unsigned int GetNextClusterNum(unsigned int clusterNum);
//unsigned long FirstSectorofCluster32(unsigned int n);
//unsigned int ThisFatSecNum32(unsigned int clusterNum);
//unsigned int ThisFatEntOffset32(unsigned int clusterNum);
//unsigned int GetNextClusterNum32(unsigned int clusterNum);
//unsigned int GetClusterNumFromSectorNum(unsigned long sectorNum);
//unsigned long GetSecNumFromPointer(void);
//unsigned char GoToPointer(unsigned long pointer);
//unsigned int GetFreeCusterNum(void);
//unsigned int CreateClusterLink(unsigned int currentCluster);
//unsigned char DeleteClusterLink(unsigned int clusterNum);
//void UpdateFat(unsigned long sectorNum);