fat.h

ch375读U盘程序

#ifndef _fat_h_
#define _fat_h_

//Block Size in Bytes
#define BlockSize			512

//Master Boot Record
#define MASTER_BOOT_RECORD	0

//BPB Address only in mmc card or usb disk
#define BIOS_PARAMETER_BLOCK	0

//Volume Boot Record location in Master Boot Record
#define VBR_ADDR 			0x1C6

//define ASCII
#define SPACE 				0x20
#define DIR_ENTRY_IS_FREE   0xE5
#define FIRST_LONG_ENTRY	0x01
#define SECOND_LONG_ENTRY	0x42

//define DIR_Attr
#define ATTR_LONG_NAME		0x0F
#define ATTR_READ_ONLY		0x01
#define ATTR_HIDDEN			0x02
#define ATTR_SYSTEM			0x04
#define ATTR_VOLUME_ID		0x08
#define ATTR_DIRECTORY		0x10
#define ATTR_ARCHIVE		0x20

#define	FAT_Flg_12			0x00
#define	FAT_Flg_16			0x01
#define	FAT_Flg_32			0x02

//fat32 BPB结构，包括扩展BPB
struct BootSec32 
{
	unsigned char	BS_jmpBoot[3];	//jmp code
	unsigned char	BS_OEMName[8];	//oem and os like dos5.0
	unsigned int	BPB_BytesPerSec; //扇区字节数
	unsigned char	BPB_SecPerClus;	//每簇扇区数
	unsigned int	BPB_RsvdSecCnt; //保留扇区数
	unsigned char	BPB_NumFATs;	//FAT数目
	unsigned int	BPB_RootEntCnt; //根目录项数 0
	unsigned int	BPB_TotSec16; 	//小扇区总数 0
	unsigned char	BPB_Media;		//媒体描述符
	unsigned int	BPB_FATSz16; 	//每FAT扇区数fat32不用为0
	unsigned int	BPB_SecPerTrk; 	//每道扇区数
	unsigned int	BPB_NumHeads; 	//磁头数
	unsigned long	BPB_HiddSec; 	//隐藏扇区数
	unsigned long	BPB_TotSec32; 	//总扇区数
	unsigned long	BPB_FATSz32;	//每FAT扇区数fat32
	unsigned int	BPB_ExtFlag;	//fat32扩展标志
	unsigned int	BPB_FileSysVer;	//fat32文件系统版本
	unsigned long	BPB_RootCluNum;	//根目录簇号
	unsigned int	BPB_FileSysInf;	//文件系统信息扇区号
	unsigned int	BPB_BootBack;	//引导扇区备份号
	unsigned char	BPB_Rsvd[12];	//保留空间
	unsigned char	BPB_PhyDriNum;	//物理驱动器号
	unsigned char	BPB_Rsvd1;		//保留
	unsigned char	BPB_ExtBootSig;	//扩展引导标签
	unsigned long	BPB_VolumeSer;	//分区序号
	unsigned char	BPB_VolumeLab[11];	//卷标
	unsigned char	BPB_SysID[8];	//系统ID
};

//fat12/16 BPB结构，包括扩展BPB
struct BootSec
{
	unsigned char	BS_jmpBoot[3];	//jmp code					0x00
	unsigned char	BS_OEMName[8];	//oem and os like dos5.0	0x03
	unsigned int	BPB_BytesPerSec; //扇区字节数				0x0B
	unsigned char	BPB_SecPerClus;	//每簇扇区数				0x0D
	unsigned int	BPB_RsvdSecCnt; //保留扇区数				0x0E
	unsigned char	BPB_NumFATs;	//FAT数目					0x10
	unsigned int	BPB_RootEntCnt; //根目录项数 512			0x11
	unsigned int	BPB_TotSec16; 	//小扇区总数 <65536时使用	0x13
	unsigned char	BPB_Media;		//媒体描述符				0x15
	unsigned int	BPB_FATSz16; 	//每FAT扇区数				0x16
	unsigned int	BPB_SecPerTrk; 	//每道扇区数				0x18
	unsigned int	BPB_NumHeads; 	//磁头数
	unsigned long	BPB_HiddSec; 	//隐藏扇区数
	unsigned long	BPB_TotSec32; 	//大扇区数 当小扇区数为0时使用这里
	unsigned char	BPB_PhyDriNum;	//物理驱动器号
	unsigned char	BPB_Rsvd1;		//保留
	unsigned char	BPB_ExtBootSig;	//扩展引导标签
	unsigned long	BPB_VolumeSer;	//卷序号
	unsigned char	BPB_VolumeLab[11];	//卷标
	unsigned char	BPB_SysID[8];	//系统ID
};

struct DirEntry
{
	unsigned char	DIR_Name[11];     //文件名，没有.
	unsigned char	DIR_Attr;         //文件属性，自低至高，只读、隐藏、系统、卷标、子目录、归档
	unsigned char	DIR_NTRes;        //系统保留
	unsigned char	DIR_CrtTimeTenth; //创建时间的10毫秒位
	unsigned int	DIR_CrtTime;      //创建时间
	unsigned int	DIR_CrtDate;      //创建日期
	unsigned int	DIR_LastAccDate;  //最后访问日期
	unsigned int	DIR_FstClusHI;    //文件起始簇号高16位               
	unsigned int	DIR_WrtTime;      //最近修改时间
	unsigned int	DIR_WrtDate;      //最近修改日期
	unsigned int	DIR_FstClusLO;    //文件起始簇号的低16位               
	unsigned long	DIR_FileSize;     //文件长度
};

unsigned int fat_read_dir_ent(unsigned long dir_cluster,unsigned int Entry_Count,unsigned long *Size,unsigned char *Dir_Attrib,unsigned char *buff);
unsigned char fat_search_file (unsigned char *File_Name,unsigned long *Cluster,unsigned long *Size,unsigned char *Dir_Attrib,unsigned char *buff);
unsigned char fat_read_file(unsigned int Cluster,unsigned char *buff,unsigned long BlockCount,unsigned char *blockserial);
void fat_load(unsigned long Cluster,unsigned long *Block,unsigned char *TMP_Buffer);

#endif