fat.h

/*#######################################################################################

Connect ARM to MMC/SD 

Copyright (C) 2004 Ulrich Radig

#######################################################################################*/

#ifndef _FAT_H_

 #define _FAT_H_

#include <string.h>

#include <avr/pgmspace.h>

#include "mmc.h"

#include "usart.h"

#define FAT_DEBUG  usart_writePC

//#define FAT_DEBUG(...)  

//Prototypes

extern unsigned int fat_root_dir_addr (unsigned char *);

extern unsigned int fat_read_dir_ent (unsigned int,unsigned char,unsigned long*,unsigned char *,unsigned char *);

extern void fat_load (unsigned int,unsigned long *,unsigned char *);

extern void fat_read_file (unsigned int,unsigned char *,unsigned long);

extern void fat_write_file (unsigned int,unsigned char *,unsigned long);

extern void fat_init (void);

extern unsigned char fat_search_file (unsigned char *,unsigned int *,unsigned long *,unsigned char *,unsigned char *);

//Block Size in Bytes

#define BlockSize      512

//Master Boot Record

#define MASTER_BOOT_RECORD  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

struct BootSec 

{

  unsigned char BS_jmpBoot[3];

  unsigned char BS_OEMName[8];

  unsigned int BPB_BytesPerSec; //2 bytes

  unsigned char  BPB_SecPerClus;

  unsigned int  BPB_RsvdSecCnt; //2 bytes

  unsigned char  BPB_NumFATs;

  unsigned int  BPB_RootEntCnt; //2 bytes

  unsigned int  BPB_TotSec16; //2 bytes

  unsigned char  BPB_Media;

  unsigned int  BPB_FATSz16; //2 bytes

  unsigned int  BPB_SecPerTrk; //2 bytes

  unsigned int  BPB_NumHeads; //2 bytes

  unsigned long  BPB_HiddSec; //4 bytes

  unsigned long  BPB_TotSec32; //4 bytes

};

//FAT12 and FAT16 Structure Starting at Offset 36

#define BS_DRVNUM      36

#define BS_RESERVED1    37

#define BS_BOOTSIG      38

#define BS_VOLID      39

#define BS_VOLLAB      43

#define BS_FILSYSTYPE    54

//FAT32 Structure Starting at Offset 36

#define BPB_FATSZ32      36

#define BPB_EXTFLAGS    40

#define BPB_FSVER      42

#define BPB_ROOTCLUS    44

#define BPB_FSINFO      48

#define BPB_BKBOOTSEC    50

#define BPB_RESERVED    52

#define FAT32_BS_DRVNUM    64

#define FAT32_BS_RESERVED1  65

#define FAT32_BS_BOOTSIG  66

#define FAT32_BS_VOLID    67

#define FAT32_BS_VOLLAB    71

#define FAT32_BS_FILSYSTYPE  82

//End of Boot Sctor and BPB Structure

struct DirEntry {

  unsigned char  DIR_Name[11];     //8 chars filename

  unsigned char  DIR_Attr;         //file attributes RSHA, Longname, Drive Label, Directory

  unsigned char  DIR_NTRes;        //set to zero

  unsigned char  DIR_CrtTimeTenth; //creation time part in milliseconds

  unsigned int  DIR_CrtTime;      //creation time

  unsigned int  DIR_CrtDate;      //creation date

  unsigned int  DIR_LastAccDate;  //last access date

  unsigned int  DIR_FstClusHI;    //first cluster high word                 

  unsigned int  DIR_WrtTime;      //last write time

  unsigned int  DIR_WrtDate;      //last write date

  unsigned int  DIR_FstClusLO;    //first cluster low word                 

  unsigned long  DIR_FileSize;     

  };

#endif //_FAT_H_