📄 fat32changedirectory.lst
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73 =2
74 =2 struct BootSecStr //引导扇区结构
75 =2 {
76 =2 BYTE BS_jmpBoot[3];
77 =2 BYTE BS_OEMName[8];
78 =2 WORD BPB_BytesPerSec; //每扇区字节数 512
79 =2 BYTE BPB_SecPerClus; //每簇扇区数 1 2 4 8 16 32 64 128
80 =2 WORD BPB_RsvdSecCnt; //保留扇区数 0x20
81 =2 BYTE BPB_NumFATs; //FAT表个数 2
82 =2 WORD BPB_RootEntCnt;
83 =2 WORD BPB_TotSec16;
84 =2 BYTE BPB_Media;
85 =2 WORD BPB_FATSz16;
86 =2 WORD BPB_SecPerTrk;
87 =2 WORD BPB_NumHeads;
88 =2 DWORD BPB_HiddSec;
89 =2 DWORD BPB_TotSec32;
90 =2 union FATUni
91 =2 {
92 =2 struct BootSecFAT32Str F32;
93 =2 struct BootSecFAT16Str F16;
94 =2 }FAT;
95 =2
96 =2 };
97 =2
98 =2 struct DPTStr //分区表结构
99 =2 {
100 =2 BYTE BootFlag;
101 =2 BYTE CHSBegin[3];
102 =2 BYTE TypeCode;
C51 COMPILER V8.08 FAT32CHANGEDIRECTORY 06/01/2008 16:21:02 PAGE 9
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 };
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
C51 COMPILER V8.08 FAT32CHANGEDIRECTORY 06/01/2008 16:21:02 PAGE 10
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
=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);
C51 COMPILER V8.08 FAT32CHANGEDIRECTORY 06/01/2008 16:21:02 PAGE 11
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 BYTE FAT32ChangeDirectory(CHAR *DirName);
6
7 BYTE FAT32ChangeDirectory(CHAR *DirName)
8 {
9 1 register DWORD cluster;
10 1 register BYTE i;
11 1
12 1 i=FAT32FindDIREntry(DirName);
13 1 if (i<16&&(sDIR[i].Attr&FAT32_ATTR_DIRECTORY)) //找到目录入口
14 1 {
15 2 cluster=(MEMSwap16(sDIR[i].FstClusHI)<<16)|MEMSwap16(sDIR[i].FstClusLO);
16 2 FAT32.CurrentDirectory=cluster;
17 2 return(0);
18 2 }
19 1 else if (!(sDIR[i].Attr&FAT32_ATTR_DIRECTORY)) return(FAT32_ERR_NOT_DIR); //目录项不是一个目录入口
20 1 else return(FAT32_ERR_DIR_NOT_FOUND); //目录入口为找到
21 1 }
C51 COMPILER V8.08 FAT32CHANGEDIRECTORY 06/01/2008 16:21:02 PAGE 12
ASSEMBLY LISTING OF GENERATED OBJECT CODE
; FUNCTION _FAT32ChangeDirectory (BEGIN)
; SOURCE LINE # 7
;---- Variable 'DirName' assigned to Register 'R1/R2/R3' ----
; SOURCE LINE # 8
; SOURCE LINE # 12
0000 120000 E LCALL _FAT32FindDIREntry
0003 900000 R MOV DPTR,#i
0006 EF MOV A,R7
0007 F0 MOVX @DPTR,A
; SOURCE LINE # 13
0008 C3 CLR C
0009 9410 SUBB A,#010H
000B 5075 JNC ?C0001
000D E0 MOVX A,@DPTR
000E 75F020 MOV B,#020H
0011 A4 MUL AB
0012 FF MOV R7,A
0013 900000 E MOV DPTR,#sDIR
0016 E0 MOVX A,@DPTR
0017 FB MOV R3,A
0018 A3 INC DPTR
0019 E0 MOVX A,@DPTR
001A FA MOV R2,A
001B A3 INC DPTR
001C E0 MOVX A,@DPTR
001D 2F ADD A,R7
001E F9 MOV R1,A
001F EA MOV A,R2
0020 35F0 ADDC A,B
0022 FA MOV R2,A
0023 90000B MOV DPTR,#0BH
0026 120000 E LCALL ?C?CLDOPTR
0029 30E456 JNB ACC.4,?C0001
; SOURCE LINE # 14
; SOURCE LINE # 15
002C 900014 MOV DPTR,#014H
002F 120000 E LCALL ?C?ILDOPTR
0032 FF MOV R7,A
0033 AEF0 MOV R6,B
0035 120000 E LCALL _MEMSwap16
0038 EF MOV A,R7
0039 7810 MOV R0,#010H
003B ?C0006:
003B C3 CLR C
003C 33 RLC A
003D CE XCH A,R6
003E 33 RLC A
003F CE XCH A,R6
0040 D8F9 DJNZ R0,?C0006
0042 FD MOV R5,A
0043 AC06 MOV R4,AR6
0045 C005 PUSH AR5
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