108 lines
3.3 KiB
C
108 lines
3.3 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 uint16_t fat_root_dir_addr(uint8_t *);
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extern uint16_t fat_read_dir_ent(uint16_t, uint8_t,
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uint32_t *, uint8_t *,
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uint8_t *);
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extern void fat_load(uint16_t, uint32_t *, uint8_t *);
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extern void fat_read_file(uint16_t, uint8_t *, uint32_t);
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extern void fat_write_file(uint16_t, uint8_t *, uint32_t);
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extern void fat_init(uint8_t * Buffer);
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extern uint8_t fat_search_file(uint8_t *, uint16_t *,
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uint32_t *, uint8_t *,
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uint8_t *);
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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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uint8_t BS_jmpBoot[3];
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uint8_t BS_OEMName[8];
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uint16_t BPB_BytesPerSec; // 2 bytes
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uint8_t BPB_SecPerClus;
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uint16_t BPB_RsvdSecCnt; // 2 bytes
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uint8_t BPB_NumFATs;
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uint16_t BPB_RootEntCnt; // 2 bytes
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uint16_t BPB_TotSec16; // 2 bytes
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uint8_t BPB_Media;
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uint16_t BPB_FATSz16; // 2 bytes
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uint16_t BPB_SecPerTrk; // 2 bytes
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uint16_t BPB_NumHeads; // 2 bytes
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uint32_t BPB_HiddSec; // 4 bytes
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uint32_t 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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uint8_t DIR_Name[11]; // 8 chars filename
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uint8_t DIR_Attr; // file attributes RSHA, Longname, Drive Label, Directory
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uint8_t DIR_NTRes; // set to zero
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uint8_t DIR_CrtTimeTenth; // creation time part in milliseconds
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uint16_t DIR_CrtTime; // creation time
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uint16_t DIR_CrtDate; // creation date
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uint16_t DIR_LastAccDate; // last access date
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uint16_t DIR_FstClusHI; // first cluster high word
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uint16_t DIR_WrtTime; // last write time
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uint16_t DIR_WrtDate; // last write date
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uint16_t DIR_FstClusLO; // first cluster low word
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uint32_t DIR_FileSize;
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};
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#endif // _FAT_H_
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