108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/*
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* ####################################################################################### Connect ARM to MMC/SD Copyright (C) 2004
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* Ulrich Radig #######################################################################################
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*/
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#ifndef _FAT_H_
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#define _FAT_H_
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#include <string.h>
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#include "mmc.h"
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#include "uart.h"
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#define FAT_DEBUG uart_puts
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// #define FAT_DEBUG(...)
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// Prototypes
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extern unsigned int fat_root_dir_addr(unsigned char *);
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extern unsigned int fat_read_dir_ent(unsigned int, unsigned char,
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unsigned long *, unsigned char *,
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unsigned char *);
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extern void fat_load(unsigned int, unsigned long *, unsigned char *);
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extern void fat_read_file(unsigned int, unsigned char *, unsigned long);
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extern void fat_write_file(unsigned int, unsigned char *, unsigned long);
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extern void fat_init(uint8_t * Buffer);
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extern unsigned char fat_search_file(unsigned char *, unsigned int *,
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unsigned long *, unsigned char *,
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unsigned char *);
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// Block Size in Bytes
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#define BlockSize 512
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// Master Boot Record
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#define MASTER_BOOT_RECORD 0
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// Volume Boot Record location in Master Boot Record
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#define VBR_ADDR 0x1C6
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// define ASCII
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#define SPACE 0x20
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#define DIR_ENTRY_IS_FREE 0xE5
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#define FIRST_LONG_ENTRY 0x01
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#define SECOND_LONG_ENTRY 0x42
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// define DIR_Attr
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#define ATTR_LONG_NAME 0x0F
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#define ATTR_READ_ONLY 0x01
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#define ATTR_HIDDEN 0x02
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#define ATTR_SYSTEM 0x04
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#define ATTR_VOLUME_ID 0x08
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#define ATTR_DIRECTORY 0x10
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#define ATTR_ARCHIVE 0x20
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struct BootSec {
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unsigned char BS_jmpBoot[3];
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unsigned char BS_OEMName[8];
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unsigned int BPB_BytesPerSec; // 2 bytes
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unsigned char BPB_SecPerClus;
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unsigned int BPB_RsvdSecCnt; // 2 bytes
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unsigned char BPB_NumFATs;
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unsigned int BPB_RootEntCnt; // 2 bytes
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unsigned int BPB_TotSec16; // 2 bytes
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unsigned char BPB_Media;
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unsigned int BPB_FATSz16; // 2 bytes
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unsigned int BPB_SecPerTrk; // 2 bytes
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unsigned int BPB_NumHeads; // 2 bytes
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unsigned long BPB_HiddSec; // 4 bytes
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unsigned long BPB_TotSec32; // 4 bytes
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};
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// FAT12 and FAT16 Structure Starting at Offset 36
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#define BS_DRVNUM 36
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#define BS_RESERVED1 37
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#define BS_BOOTSIG 38
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#define BS_VOLID 39
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#define BS_VOLLAB 43
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#define BS_FILSYSTYPE 54
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// FAT32 Structure Starting at Offset 36
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#define BPB_FATSZ32 36
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#define BPB_EXTFLAGS 40
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#define BPB_FSVER 42
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#define BPB_ROOTCLUS 44
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#define BPB_FSINFO 48
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#define BPB_BKBOOTSEC 50
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#define BPB_RESERVED 52
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#define FAT32_BS_DRVNUM 64
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#define FAT32_BS_RESERVED1 65
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#define FAT32_BS_BOOTSIG 66
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#define FAT32_BS_VOLID 67
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#define FAT32_BS_VOLLAB 71
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#define FAT32_BS_FILSYSTYPE 82
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// End of Boot Sctor and BPB Structure
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struct DirEntry {
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unsigned char DIR_Name[11]; // 8 chars filename
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unsigned char DIR_Attr; // file attributes RSHA, Longname, Drive Label, Directory
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unsigned char DIR_NTRes; // set to zero
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unsigned char DIR_CrtTimeTenth; // creation time part in milliseconds
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unsigned int DIR_CrtTime; // creation time
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unsigned int DIR_CrtDate; // creation date
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unsigned int DIR_LastAccDate; // last access date
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unsigned int DIR_FstClusHI; // first cluster high word
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unsigned int DIR_WrtTime; // last write time
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unsigned int DIR_WrtDate; // last write date
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unsigned int DIR_FstClusLO; // first cluster low word
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unsigned long DIR_FileSize;
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};
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#endif // _FAT_H_
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