fat.h

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/*************************************************************/
/*                   FAT操作函数库                           */
/*  环境WinAVR 20060421                                      */
/*  作者：Bozai（章其波）                                    */
/*  E-mail：[e-mail]                                  */
/*  2007年2月13日                                            */
/*************************************************************/
/*  20071208: modify codes for ARM platform (AT91SAM7S256)  */
/*  20071109: add & modify function for any directory music file playing */
/*  20071103: add function for lyric display */
/*History: 2007年2月13日                                     */
/*			添加了适合于RAM丰富的AVR单片机操作 的FAT表函数	 */
/*	改进了查找FAT表的函数,使在硬盘操作时不需频繁去读FAT表.   */
/*        	注: 只适合RAM足够多的单片机                      */
/*************************************************************/


#ifndef __FAT_H__
#define __FAT_H__
#include "global.h"
#include    <stdlib.h>


#define CHAR	char
#define BYTE	unsigned char
#define WORD	unsigned short
#define DWORD	unsigned int


#define FAT_BUFFERED 1

#define MAX_LONG_NAME_SIZE 80	/* 26*n+2   n=3 */
#define FAT_DEBUG 0				/* FAT debug flag */

#if FAT_DEBUG
	#define FAT_DBG_Printf printf
	#define FAT_DBG_Putc uart0_putc
#endif


#define FIX_DIRECTORY 0		/* 1 means use fix directory, 0 for any directory */


#if FIX_DIRECTORY==0

	#define  RECORD_SIZE 256	
	#define  RECORD_ADDR_START 0	/* eeprom start address */
	#define  RECORD_ADDR_END  RECORD_SIZE*4	/* eeprom end address */
	
#endif


extern BYTE (* FAT_ReadSector)(DWORD,BYTE *);
extern BYTE (* FAT_WriteSector)(DWORD,BYTE *);
extern DWORD (* FAT_ReadCapacity)(void);

//声明外部器件读写函数
extern BYTE CH375_ReadOneSector(DWORD LBA,BYTE *buffer);
extern BYTE CH375_WriteOneSector(DWORD LBA,BYTE *buffer);
extern BYTE MMC_SD_ReadSingleBlock(DWORD sector, BYTE* buffer);
extern BYTE MMC_SD_WriteSingleBlock(DWORD sector, BYTE* buffer);
extern BYTE IDE_ReadOneSector(DWORD LBA,BYTE *buffer);
extern BYTE IDE_WriteOneSector(DWORD LBA,BYTE *buffer);

extern DWORD MMC_SD_ReadCapacity(void);



#define MSDOSFSROOT     0               // cluster 0 means the root dir
#define CLUST_FREE      0               // cluster 0 also means a free cluster
#define MSDOSFSFREE     CLUST_FREE
#define CLUST_FIRST     2             	// first legal cluster number
#define CLUST_RSRVD     0xfff6      	// reserved cluster range
#define CLUST_BAD       0xfff7     		// a cluster with a defect
#define CLUST_EOFS      0xfff8     		// start of eof cluster range
#define CLUST_EOFE      0xffff      	// end of eof cluster range


struct partrecord // length 16 bytes
{			
	BYTE	prIsActive;					// 0x80 indicates active partition
	BYTE	prStartHead;				// starting head for partition
	WORD	prStartCylSect;				// starting cylinder and sector
	BYTE	prPartType;					// partition type (see above)
	BYTE	prEndHead;					// ending head for this partition
	WORD	prEndCylSect;				// ending cylinder and sector
	DWORD	prStartLBA;					// first LBA sector for this partition
	DWORD	prSize;						// size of this partition (bytes or sectors ?)
};

struct partrecordBytes // length 16 bytes
{			
	BYTE	prIsActive;					// 0x80 indicates active partition
	BYTE	prStartHead;				// starting head for partition
	BYTE	prStartCylSect[2];			// starting cylinder and sector
	BYTE	prPartType;					// partition type (see above)
	BYTE	prEndHead;					// ending head for this partition
	BYTE	prEndCylSect[2];				// ending cylinder and sector
	BYTE	prStartLBA[4];				// first LBA sector for this partition
	BYTE	prSize[4];					// size of this partition (bytes or sectors ?)
};
        
struct partsector
{
	CHAR	psPartCode[512-64-2];		// pad so struct is 512b
	BYTE	psPart[64];					// four partition records (64 bytes)
	BYTE	psBootSectSig0;				// two signature bytes (2 bytes)
	BYTE	psBootSectSig1;
#define BOOTSIG0        0x55
#define BOOTSIG1        0xaa
};

struct extboot {
	CHAR	exDriveNumber;				// drive number (0x80)//0x00 for floopy disk 0x80 for hard disk
	CHAR	exReserved1;				// reserved should always set 0
	CHAR	exBootSignature;			// ext. boot signature (0x29)
#define EXBOOTSIG       0x29
	CHAR	exVolumeID[4];				// volume ID number
	CHAR	exVolumeLabel[11];			// volume label "NO NAME"
	CHAR	exFileSysType[8];			// fs type (FAT12 or FAT)
};

struct bootsector50 {
	BYTE	bsJump[3];					// jump inst E9xxxx or EBxx90
	CHAR	bsOemName[8];				// OEM name and version
	CHAR	bsBPB[25];					// BIOS parameter block
	CHAR	bsExt[26];					// Bootsector Extension
	CHAR	bsBootCode[448];			// pad so structure is 512b
	BYTE	bsBootSectSig0;				// boot sector signature byte 0x55 
	BYTE	bsBootSectSig1;				// boot sector signature byte 0xAA
#define BOOTSIG0        0x55
#define BOOTSIG1        0xaa
};


struct bpb50 {
        WORD	bpbBytesPerSec; // bytes per sector				//512 1024 2048 or 4096
        BYTE	bpbSecPerClust; // sectors per cluster			// power of 2
        WORD	bpbResSectors;  // number of reserved sectors	//1 is recommend
        BYTE	bpbFATs;        // number of FATs				// 2 is recommend
        WORD	bpbRootDirEnts; // number of root directory entries
        WORD	bpbSectors;     // total number of sectors
        BYTE	bpbMedia;       // media descriptor				//0xf8 match the fat[0]
        WORD	bpbFATsecs;     // number of sectors per FAT
        WORD	bpbSecPerTrack; // sectors per track
        WORD	bpbHeads;       // number of heads
        DWORD	bpbHiddenSecs;  // # of hidden sectors
        DWORD	bpbHugeSectors; // # of sectors if bpbSectors == 0
};

struct bootsector710 {
	BYTE	bsJump[3];					// jump inst E9xxxx or EBxx90
	CHAR	bsOemName[8];				// OEM name and version
	CHAR	bsBPB[53];					// BIOS parameter block
	CHAR	bsExt[26];					// Bootsector Extension
	CHAR	bsBootCode[418];			// pad so structure is 512b
	BYTE	bsBootSectSig2;				// boot sector signature byte 0x00 
	BYTE	bsBootSectSig3;				// boot sector signature byte 0x00
	BYTE	bsBootSectSig0;				// boot sector signature byte 0x55 
	BYTE	bsBootSectSig1;				// boot sector signature byte 0xAA
#define BOOTSIG0        0x55
#define BOOTSIG1        0xaa
#define BOOTSIG2        0x00
#define BOOTSIG3        0x00
};

struct bpb710 {
		WORD	bpbBytesPerSec;	// bytes per sector
		BYTE	bpbSecPerClust;	// sectors per cluster
		WORD	bpbResSectors;	// number of reserved sectors
		BYTE	bpbFATs;		// number of FATs
		WORD	bpbRootDirEnts;	// number of root directory entries
		WORD	bpbSectors;		// total number of sectors
		BYTE	bpbMedia;		// media descriptor
		WORD	bpbFATsecs;		// number of sectors per FAT
		WORD	bpbSecPerTrack;	// sectors per track
		WORD	bpbHeads;		// number of heads
		DWORD	bpbHiddenSecs;	// # of hidden sectors
// 3.3 compat ends here
		DWORD	bpbHugeSectors;	// # of sectors if bpbSectors == 0
// 5.0 compat ends here
		DWORD     bpbBigFATsecs;// like bpbFATsecs for FAT32
		WORD      bpbExtFlags;	// extended flags:
#define FATNUM    0xf			// mask for numbering active FAT
#define FATMIRROR 0x80			// FAT is mirrored (like it always was)
		WORD      bpbFSVers;	// filesystem version
#define FSVERS    0				// currently only 0 is understood
		DWORD     bpbRootClust;	// start cluster for root directory
		WORD      bpbFSInfo;	// filesystem info structure sector
		WORD      bpbBackup;	// backup boot sector
		// There is a 12 byte filler here, but we ignore it
};

struct bpb710Bytes {
		BYTE	bpbBytesPerSec[2];	// bytes per sector
		BYTE	bpbSecPerClust;	// sectors per cluster
		BYTE	bpbResSectors[2];	// number of reserved sectors
		BYTE	bpbFATs;		// number of FATs