fat._h

用ATmega128做的mp3播放器

#ifndef __fat_h
#define __fat_h

//******************************************************************
//*	FUNCTION PROTOTYPES
//******************************************************************
void InitFat(void);
unsigned long Clust2LBA(unsigned long clust);
unsigned long GetNextCluster(unsigned long Clust);
int GetDir(unsigned long Cluster, unsigned int From, unsigned int Qte, unsigned int Type,unsigned int Display);
void DisplayFiles(unsigned char *LinePtr);

//******************************************************************
//*	FAT Definitions
//******************************************************************
#define CLUST_RSRVD     	0x0ffffff6      /* reserved cluster range */
#define CLUST_BAD       	0x0ffffff7      /* a cluster with a defect */
#define CLUST_EOFS      	0x0ffffff8      /* start of eof cluster range */
#define CLUST_EOFE      	0x0fffffff      /* end of eof cluster range */

#define SLOT_EMPTY      	0x00      // slot has never been used
#define SLOT_E5         	0x05      // the real value is 0xe5
#define SLOT_DELETED    	0xe5      // file in this slot deleted

#define ATTR_NORMAL     	0x00      // normal file
#define ATTR_READONLY   	0x01      // file is readonly
#define ATTR_HIDDEN     	0x02      // file is hidden
#define ATTR_SYSTEM     	0x04      // file is a system file
#define ATTR_VOLUME     	0x08      // entry is a volume label
#define ATTR_LONG_FILENAME	0x0f	  // this is a long filename entry			    
#define ATTR_DIRECTORY  	0x10      // entry is a directory name
#define ATTR_ARCHIVE    	0x20      // file is new or modified

#define TRUE				1
#define FALSE				0

#define	FILE				0
#define DIR					1
#define PLAY				2

//******************************************************************
//*	FAT struct
//******************************************************************

struct PartRecord // length 16 bytes from 446 bytes
{			
		unsigned char 	IsActive;		// 0x80 indicates active partition
		unsigned char 	StartHead;		// starting head for partition
		unsigned int	StartCylSect;	// starting cylinder and sector
		unsigned char	PartType;		// partition type (see above)
		unsigned char	EndHead;		// ending head for this partition
		unsigned int	EndCylSect;		// ending cylinder and sector
		unsigned long	StartLBA;		// first LBA sector for this partition
		unsigned long	Size;			// size of this partition (bytes or sectors ?)
};

struct BootRecord 
{
	   unsigned char 	jmp[3];
	   unsigned char 	name[8];
	   unsigned int  	BytesPerSec;	// bytes per sector
	   unsigned char 	SecPerClust;	// sectors per cluster
	   unsigned int	 	ResSectors;		// number of reserved sectors
	   unsigned char 	FATs;			// number of FATs
	   unsigned int	 	RootDirEnts;	// number of root directory entries
	   unsigned int	 	Sectors;		// total number of sectors
	   unsigned char 	Media;			// media descriptor
	   unsigned int	 	FATsecs;		// number of sectors per FAT
	   unsigned int	 	SecPerTrack;	// sectors per track
	   unsigned int	 	Heads;			// number of heads
	   unsigned long 	HiddenSecs;		// # of hidden sectors
	   unsigned long 	HugeSectors;	// # of sectors if bpbSectors == 0
	   unsigned long 	FATSize;		// like bpbFATsecs for FAT32
	   unsigned int  	ExtFlags;		// extended flags:
	   unsigned int  	FSVers;			// filesystem version
	   unsigned long 	RootClust;		// start cluster for root directory
	   unsigned int  	FSInfo;			// filesystem info structure sector
	   unsigned int  	Backup;			// backup boot sector
};

//Short file name structure
struct DirEntry 
{
		unsigned char	Name[8];      	// filename, blank filled
		unsigned char	Extension[3]; 	// extension, blank filled
		unsigned char	Attributes;   	// file attributes
		unsigned char   LowerCase;    	// NT VFAT lower case flags
		unsigned char   CHundredth;   	// hundredth of seconds in CTime
		unsigned char   CTime[2];     	// create time
		unsigned char   CDate[2];     	// create date
		unsigned char   ADate[2];     	// access date
		unsigned int    FirstClustHi;	// high bytes of cluster number
		unsigned char   MTime[2];     	// last update time
		unsigned char   MDate[2];    	// last update date
		unsigned int    FirstClustLo; 	// starting cluster of file
		unsigned long   FileSize;  		// size of file in bytes
};

//Long file name structure
struct WinEntry 
{
        unsigned char   Cnt;			//Start offset of text in name
        unsigned int    Part1[5];		//First 5 bytes of name, size is word because of UNICODE
        unsigned char   Attr;			//Attributes;
        unsigned char   Reserved1;
        unsigned char   Chksum;
        unsigned int    Part2[6];		//Next 6 bytes of name
        unsigned int    Reserved2;		
        unsigned int    Part3[2];		//Last 2 bytes, total 13 bytes
};

//MP3 player structure
struct FileInfo
{
 	   unsigned char 	Name[256];		// 100 first char on the longfilename
	   unsigned char	Extension[3];	// extension
	   unsigned char	Attr;			// file attributes
	   unsigned long	FirstClust;		// starting cluster of file
	   unsigned long	FileSize;		// size of file in bytes
};

#endif