📄 fat32init.lst
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103 =2 BYTE CHSEnd[3];
104 =2 DWORD LBABegin;
105 =2 DWORD CntSec;
106 =2 };
107 =2
108 =2 struct sDPTStr //简化的分区表
109 =2 {
110 =2 BYTE TypeCode;
111 =2 DWORD LBABegin;
112 =2 DWORD CntSec;
113 =2 };
114 =2
115 =2 struct FAT32FSInfoStr //FAT32扩展信息结构
116 =2 {
117 =2 DWORD LeadSig;
118 =2 BYTE Reserved1[480];
119 =2 DWORD StrucSig;
120 =2 DWORD FreeCount;
121 =2 DWORD NxtFree;
122 =2 BYTE Reserved2[12];
123 =2 DWORD TrailSig;
124 =2 };
C51 COMPILER V6.23a FAT32INIT 12/24/2004 00:11:05 PAGE 9
125 =2
126 =2 struct FAT32SDirStr //FAT目录结构 短文件名
127 =2 {
128 =2 CHAR Name[11];
129 =2 BYTE Attr;
130 =2 BYTE NTRes;
131 =2 BYTE CrtTimeTenth;
132 =2 WORD CrtTime;
133 =2 WORD CrtDate;
134 =2 WORD LstAccDate;
135 =2 WORD FstClusHI;
136 =2 WORD WrtTime;
137 =2 WORD WrtDate;
138 =2 WORD FstClusLO;
139 =2 DWORD FileSize;
140 =2 };
141 =2
142 =2 struct FAT32LDirStr //FAT目录结构 长文件名
143 =2 {
144 =2 BYTE Ord;
145 =2 BYTE Name1[10];
146 =2 BYTE Attr;
147 =2 BYTE Type;
148 =2 BYTE Chksum;
149 =2 BYTE Name2[12];
150 =2 WORD FstClusLO;
151 =2 BYTE Name3[4];
152 =2 };
153 =2
154 =2 struct FAT32Str //FAT32参数表
155 =2 {
156 =2 BYTE ClusSecCnt; //当前簇扇区计数
157 =2 DWORD CurrentDirectory; //当前目录入口（簇号）
158 =2 BYTE SecPerClus; //每簇扇区数 1 2 4 8 16 32 64 128
159 =2 WORD RsvdSecCnt; //保留扇区数 0x20
160 =2 BYTE NumFATs; //FAT表个数 2
161 =2 DWORD RootClus; //根目录开始的簇
162 =2 DWORD ClusSec; //簇开始的扇区
163 =2 DWORD FATSz; //FAT表大小（扇区）
164 =2 DWORD FATSec; //FAT表开始扇区
165 =2 DWORD FSISec; //FSI所在扇区
166 =2 DWORD FSIFreeCount; //空闲簇数
167 =2 DWORD FSINxtFree; //空闲簇搜索指针
168 =2 };
169 =2
170 =2 struct FCBStr
171 =2 {
172 =2 CHAR FileName[12]; //文件名
173 =2 DWORD Size; //文件大小
174 =2 DWORD FirstCluster; //第一个簇
175 =2 DWORD LastCluster; //最近一次读到的簇号
176 =2 DWORD ClusSecCnt; //当前簇扇区计数
177 =2 DWORD ByteCnt; //当前字节计数
178 =2 };
179 =2
180 =2 struct FATStr
181 =2 {
182 =2 DWORD Sector;
183 =2 DWORD FAT[128];
184 =2 };
185 =2
186 =2 #ifndef _LIBRARY_DEFINE
C51 COMPILER V6.23a FAT32INIT 12/24/2004 00:11:05 PAGE 10
=2 xdata BYTE DiskBuffer[512];
=2
=2 xdata struct sDPTStr sDPT[4];
=2 xdata struct FAT32Str FAT32;
=2 xdata struct FCBStr FCB[FAT32_MAX_FCB];
=2 xdata CHAR LongFileName[256];
=2 xdata struct FATStr FAT;
=2 xdata struct DPTStr *DPT; //分区表结构指针
=2 xdata struct BootSecStr *BOOTSEC; //引导扇区结构指针
=2 xdata struct FAT32FSInfoStr *FSI; //FAT32扩展信息
=2 xdata struct FAT32SDirStr *sDIR; //FAT目录结构指针
=2 xdata struct FAT32LDirStr *lDIR; //FAT目录结构指针
=2 #endif
200 =2 #endif
201 =2
202 =2 extern xdata BYTE DiskBuffer[512];
203 =2
204 =2 extern xdata struct sDPTStr sDPT[4];
205 =2 extern xdata struct FAT32Str FAT32;
206 =2 extern xdata struct FCBStr FCB[FAT32_MAX_FCB];
207 =2 extern xdata CHAR LongFileName[256];
208 =2 extern xdata struct FATStr FAT;
209 =2 extern xdata struct DPTStr *DPT; //分区表结构指针
210 =2 extern xdata struct BootSecStr *BOOTSEC; //引导扇区结构指针
211 =2 extern xdata struct FAT32FSInfoStr *FSI; //FAT32扩展信息
212 =2 extern xdata struct FAT32SDirStr *sDIR; //FAT目录结构指针
213 =2 extern xdata struct FAT32LDirStr *lDIR; //FAT目录结构指针
214 =2
215 =2 extern void FAT32Init(void);
216 =2 extern BYTE FAT32MountPartition(void);
217 =2 extern BYTE FAT32MountVolumeID(BYTE Partition);
218 =2 extern BYTE FAT32GetDirName(WORD SecNum);
219 =2 extern void FAT32GetPartLongName(struct FAT32LDirStr *ldp,CHAR *name);
220 =2 extern DWORD FAT32DiskSize(void);
221 =2 extern DWORD FAT32DiskFreeSize(void);
222 =2 extern BYTE FAT32FindDIREntry(CHAR *DirName);
223 =2 extern void FAT32ReadCluster(DWORD *Cluster);
224 =2 extern BYTE FAT32ChangeDirectory(CHAR *DirName);
225 =2 extern BYTE FAT32ListDirectory(void);
226 =2 extern DWORD FAT32NextCluster(DWORD CurrentCluster);
227 =2 extern BYTE FAT32OpenFile(CHAR *filename);
228 =2 extern void FAT32CloseFile(BYTE fp);
229 =2 extern WORD FAT32ReadFile(BYTE fp);
11 =1
12 =1
3 #endif
4
5 void FAT32Init(void);
6
7 void FAT32Init(void)
8 {
9 1 register BYTE i;
10 1
11 1 DPT = (struct DPTStr *)(DiskBuffer+0x1be); //分区表结构指针
12 1 BOOTSEC = (struct BootSecStr *)(DiskBuffer); //引导扇区结构指针
13 1 FSI = (struct FAT32FSInfoStr *)(DiskBuffer); //FAT32扩展信息
14 1 sDIR = (struct FAT32SDirStr *)(DiskBuffer); //FAT目录结构指针
15 1 lDIR = (struct FAT32LDirStr *)(DiskBuffer); //FAT目录结构指针
16 1
17 1 for(i=0;i<FAT32_MAX_FCB;i++)
18 1 {
19 2 FCB[i].FileName[0]=0;
C51 COMPILER V6.23a FAT32INIT 12/24/2004 00:11:05 PAGE 11
20 2 FCB[i].Size=0;
21 2 FCB[i].FirstCluster=0;
22 2 FCB[i].LastCluster=0;
23 2 FCB[i].ClusSecCnt=0;
24 2 FCB[i].ByteCnt=0;
25 2 }
26 1 }
C51 COMPILER V6.23a FAT32INIT 12/24/2004 00:11:05 PAGE 12
ASSEMBLY LISTING OF GENERATED OBJECT CODE
; FUNCTION FAT32Init (BEGIN)
; SOURCE LINE # 7
; SOURCE LINE # 8
; SOURCE LINE # 11
0000 900000 E MOV DPTR,#DPT
0003 7401 MOV A,#01H
0005 F0 MOVX @DPTR,A
0006 A3 INC DPTR
0007 7400 E MOV A,#HIGH DiskBuffer+01BEH
0009 F0 MOVX @DPTR,A
000A A3 INC DPTR
000B 7400 E MOV A,#LOW DiskBuffer+01BEH
000D F0 MOVX @DPTR,A
; SOURCE LINE # 12
000E 900000 E MOV DPTR,#BOOTSEC
0011 7401 MOV A,#01H
0013 F0 MOVX @DPTR,A
0014 A3 INC DPTR
0015 7400 E MOV A,#HIGH DiskBuffer
0017 F0 MOVX @DPTR,A
0018 A3 INC DPTR
0019 7400 E MOV A,#LOW DiskBuffer
001B F0 MOVX @DPTR,A
; SOURCE LINE # 13
001C F9 MOV R1,A
001D 900000 E MOV DPTR,#FSI
0020 7401 MOV A,#01H
0022 F0 MOVX @DPTR,A
0023 A3 INC DPTR
0024 7400 E MOV A,#HIGH DiskBuffer
0026 F0 MOVX @DPTR,A
0027 A3 INC DPTR
0028 E9 MOV A,R1
0029 F0 MOVX @DPTR,A
; SOURCE LINE # 14
002A 900000 E MOV DPTR,#sDIR
002D 7401 MOV A,#01H
002F F0 MOVX @DPTR,A
0030 A3 INC DPTR
0031 7400 E MOV A,#HIGH DiskBuffer
0033 F0 MOVX @DPTR,A
0034 A3 INC DPTR
0035 E9 MOV A,R1
0036 F0 MOVX @DPTR,A
; SOURCE LINE # 15
0037 900000 E MOV DPTR,#lDIR
003A 7401 MOV A,#01H
003C F0 MOVX @DPTR,A
003D A3 INC DPTR
003E 7400 E MOV A,#HIGH DiskBuffer
0040 F0 MOVX @DPTR,A
0041 A3 INC DPTR
0042 E9 MOV A,R1
0043 F0 MOVX @DPTR,A
; SOURCE LINE # 17
;---- Variable 'i' assigned to Register 'R3' ----
0044 E4 CLR A
0045 FB MOV R3,A
0046 ?C0001:
C51 COMPILER V6.23a FAT32INIT 12/24/2004 00:11:05 PAGE 13
; SOURCE LINE # 18
; SOURCE LINE # 19
0046 EB MOV A,R3
0047 C4 SWAP A
0048 33 RLC A
0049 54E0 ANL A,#0E0H
004B 2400 E ADD A,#LOW FCB
004D F582 MOV DPL,A
004F E4 CLR A
0050 3400 E ADDC A,#HIGH FCB
0052 F583 MOV DPH,A
0054 E4 CLR A
0055 F0 MOVX @DPTR,A
; SOURCE LINE # 20
0056 EB MOV A,R3
0057 C4 SWAP A
0058 33 RLC A
0059 54E0 ANL A,#0E0H
005B 2400 E ADD A,#LOW FCB+0CH
005D F582 MOV DPL,A
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