📄 fat.lst
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C51 COMPILER V7.06 FAT 11/22/2004 22:08:31 PAGE 1
C51 COMPILER V7.06, COMPILATION OF MODULE FAT
OBJECT MODULE PLACED IN FAT.OBJ
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE FAT.C DEBUG OBJECTEXTEND CODE
stmt level source
1 #include "common.h"
2
3 ////////////////////////////////////////
4 extern XXGFLAGS bdata bXXGFlags;
5 extern SYS_INFO_BLOCK xdata DeviceInfo;
6 extern FILE_INFO xdata ThisFile;
7 extern unsigned char xdata DBUF[BUFFER_LENGTH];
8 unsigned char xdata FATBUF[512];
9 unsigned char xdata CurFatSector[512];
10 FREE_FAT_INFO xdata FreeFat;
11 ////////////////////////////////////////
12 unsigned long FirstSectorofCluster(unsigned int clusterNum)
13 {
14 1 unsigned long temp;
15 1 temp=clusterNum-2;
16 1 temp=temp*DeviceInfo.BPB_SecPerClus;
17 1 temp=temp+DeviceInfo.FirstDataSector;
18 1 return temp;
19 1 }
20
21 unsigned int ThisFatSecNum(unsigned int clusterNum)
22 {
23 1 unsigned int temp;
24 1 temp=clusterNum*2;
25 1 temp=temp/DeviceInfo.BPB_BytesPerSec;
26 1 temp=temp+DeviceInfo.FatStartSector;
27 1 return temp;
28 1 }
29
30 unsigned int ThisFatEntOffset(unsigned int clusterNum)
31 {
32 1 unsigned int temp1,temp2;
33 1 temp1=2*clusterNum;
34 1 temp2=temp1/DeviceInfo.BPB_BytesPerSec;
35 1 temp1=temp1-temp2*DeviceInfo.BPB_BytesPerSec;
36 1 return temp1;
37 1 }
38
39 unsigned int GetNextClusterNum(unsigned int clusterNum)
40 {
41 1 unsigned int xxgFatSecNum,xxgFatEntOffset;
42 1
43 1 xxgFatSecNum=ThisFatSecNum(clusterNum);
44 1 xxgFatEntOffset=ThisFatEntOffset(clusterNum);
45 1 //ThisFile.FatSectorPointer=xxgFatSecNum;
46 1 if(ThisFile.FatSectorPointer!=xxgFatSecNum)
47 1 {
48 2
49 2 if(!RBC_Read(xxgFatSecNum,1,FATBUF))
50 2 return 0xFFFF;
51 2 ThisFile.FatSectorPointer=xxgFatSecNum;
52 2 }
53 1
54 1 ///////////////////////////////////////////////////
55 1 clusterNum=FATBUF[xxgFatEntOffset+1];
C51 COMPILER V7.06 FAT 11/22/2004 22:08:31 PAGE 2
56 1 clusterNum=clusterNum<<8;
57 1 clusterNum+=FATBUF[xxgFatEntOffset];
58 1 return clusterNum;
59 1 }
60
61 unsigned char DeleteClusterLink(unsigned int clusterNum)
62 {
63 1 //unsigned int nextClusterNum;
64 1 unsigned int xxgFatSecNum,xxgFatEntOffset;
65 1 //nextClusterNum=GetNextClusterNum(clusterNum);
66 1 ////////////////////////////////////////////
67 1 //nextClusterNum=clusterNum;
68 1 while((clusterNum>1)&&(clusterNum<0xfff0))
69 1 {
70 2 xxgFatSecNum=ThisFatSecNum(clusterNum);
71 2 xxgFatEntOffset=ThisFatEntOffset(clusterNum);
72 2 if(RBC_Read(xxgFatSecNum,1,DBUF))
73 2 {
74 3 clusterNum=DBUF[xxgFatEntOffset+1];
75 3 clusterNum=clusterNum<<8;
76 3 clusterNum+=DBUF[xxgFatEntOffset];
77 3 //return clusterNum;
78 3 }
79 2 else
80 2 return FALSE;
81 2 DBUF[xxgFatEntOffset]=0x00;
82 2 DBUF[xxgFatEntOffset+1]=0x00;
83 2 //DelayMs(5);
84 2 if(!RBC_Write(xxgFatSecNum,1,DBUF))
85 2 return FALSE;
86 2 //DelayMs(5);
87 2 if(!RBC_Write(xxgFatSecNum+DeviceInfo.BPB_FATSz16,1,DBUF))
88 2 return FALSE;
89 2 ////////////////////////////////////////////
90 2 }
91 1 return TRUE;
92 1 }
93
94 /*
95 unsigned int GetClusterNumFromSectorNum(unsigned long sectorNum)
96 {
97 unsigned long temp;
98 temp=sectorNum-DeviceInfo.FirstDataSector;
99 temp=temp/DeviceInfo.BPB_SecPerClus;
100 temp=temp+2;
101 return (unsigned int)temp;
102 }
103 */
104
105 /*
106 unsigned long GetSecNumFromPointer(void)
107 {
108 unsigned int clusterNum,clusterSize;
109 unsigned long temp,pointer;
110 pointer=ThisFile.FilePointer;
111 clusterSize=DeviceInfo.BPB_SecPerClus*DeviceInfo.BPB_BytesPerSec;
112 clusterNum=ThisFile.StartCluster;
113 while(pointer>clusterSize)
114 {
115 pointer-=clusterSize;
116 clusterNum=GetNextClusterNum(clusterNum);
117 }
C51 COMPILER V7.06 FAT 11/22/2004 22:08:31 PAGE 3
118 temp=FirstSectorofCluster(clusterNum)+pointer/DeviceInfo.BPB_BytesPerSec;
119 return temp;
120 }
121 */
122 unsigned char GoToPointer(unsigned long pointer)
123 {
124 1 //unsigned char temp;
125 1 unsigned int clusterSize;
126 1 //unsigned long temp;
127 1 //pointer=ThisFile.FilePointer;
128 1 clusterSize=DeviceInfo.BPB_SecPerClus*DeviceInfo.BPB_BytesPerSec;
129 1 ThisFile.ClusterPointer=ThisFile.StartCluster;
130 1 while(pointer>clusterSize)
131 1 {
132 2 pointer-=clusterSize;
133 2 ThisFile.ClusterPointer=GetNextClusterNum(ThisFile.ClusterPointer);
134 2 if(ThisFile.ClusterPointer==0xffff)
135 2 {
136 3 return FALSE;
137 3 }
138 2 }
139 1 ThisFile.SectorofCluster=pointer/DeviceInfo.BPB_BytesPerSec;
140 1 ThisFile.SectorPointer=FirstSectorofCluster(ThisFile.ClusterPointer)+ThisFile.SectorofCluster;
141 1 ThisFile.OffsetofSector=pointer-ThisFile.SectorofCluster*DeviceInfo.BPB_BytesPerSec;
142 1 ThisFile.FatSectorPointer=0;
143 1 return TRUE;
144 1
145 1 }
146
147 unsigned int GetFreeCusterNum(void)
148 {
149 1 unsigned int clusterNum,i;
150 1 unsigned long sectorNum;
151 1 clusterNum=0;
152 1 sectorNum=DeviceInfo.FatStartSector;
153 1 while(sectorNum<DeviceInfo.BPB_FATSz16+DeviceInfo.FatStartSector)
154 1 {
155 2
156 2 if(!RBC_Read(sectorNum,1,DBUF))
157 2 return 0x0;
158 2 for(i=0;i<DeviceInfo.BPB_BytesPerSec;i=i+2)
159 2 {
160 3 //clusterNum++;
161 3
162 3 if((DBUF[i]==0)&&(DBUF[i+1]==0))
163 3 {
164 4 DBUF[i]=0xff;
165 4 DBUF[i+1]=0xff;
166 4 //DelayMs(10);
167 4 if(!RBC_Write(sectorNum,1,DBUF))
168 4 return 0x00;
169 4 //DelayMs(10);
170 4 if(!RBC_Write(sectorNum+DeviceInfo.BPB_FATSz16,1,DBUF))
171 4 return 0x00;
172 4
173 4 return clusterNum;
174 4 }
175 3 clusterNum++;
176 3 }
177 2
178 2 sectorNum=2*clusterNum/DeviceInfo.BPB_BytesPerSec+DeviceInfo.FatStartSector;
179 2 //clusterNum+=DeviceInfo.BPB_BytesPerSec;
C51 COMPILER V7.06 FAT 11/22/2004 22:08:31 PAGE 4
180 2 //DelayMs(10);
181 2 }
182 1
183 1 return 0x0;
184 1 }
185
186 unsigned int CreateClusterLink(unsigned int currentCluster)
187 {
188 1 unsigned char bFound;
189 1 unsigned int clusterNum;
190 1 unsigned int xxgFatSecNum,xxgFatEntOffset;
191 1 unsigned long temp;
192 1 bFound=0;
193 1 //////////////////////////////////////////////
194 1 //第一次读FAT
195 1 if((FreeFat.SectorNum==DeviceInfo.FatStartSector)&&(FreeFat.OffsetofSector<3))
196 1 {
197 2 if(!RBC_Read(FreeFat.SectorNum,1,CurFatSector))
198 2 return 0x0;
199 2 }
200 1 //////////////////////////////
201 1 temp=FreeFat.SectorNum-DeviceInfo.FatStartSector;
202 1 temp=temp*DeviceInfo.BPB_BytesPerSec;
203 1 temp=temp/2;
204 1 clusterNum=temp+FreeFat.OffsetofSector/2;
205 1
206 1 while(FreeFat.SectorNum<DeviceInfo.BPB_FATSz16+DeviceInfo.FatStartSector)
207 1 {
208 2
209 2 while(FreeFat.OffsetofSector<DeviceInfo.BPB_BytesPerSec)
210 2 {
211 3
212 3 ///////////////////////////////////////////////
213 3 if((CurFatSector[FreeFat.OffsetofSector]==0)&&(CurFatSector[FreeFat.OffsetofSector+1]==0))
214 3 {
215 4 CurFatSector[FreeFat.OffsetofSector]=0xff;
216 4 CurFatSector[FreeFat.OffsetofSector+1]=0xff;
217 4
218 4 FreeFat.OffsetofSector=FreeFat.OffsetofSector+2;
219 4 //return clusterNum;
220 4 bXXGFlags.bits.bFatChanged=1;
221 4 bFound=1;
222 4 break;
223 4 }
224 3 FreeFat.OffsetofSector=FreeFat.OffsetofSector+2;
225 3 clusterNum++;
226 3 }
227 2 if(bFound==1)
228 2 break;
229 2 //FreeFat.SectorNum=2*clusterNum/DeviceInfo.BPB_BytesPerSec+DeviceInfo.FatStartSector;
230 2 //FreeFat.OldSectorNum=FreeFat.SectorNum;
231 2 //FreeFat.SectorNum++;
232 2 //FreeFat.OffsetofSector=0;
233 2 UpdateFat(FreeFat.SectorNum);
234 2
235 2 FreeFat.SectorNum++;
236 2 FreeFat.OffsetofSector=0;
237 2
238 2 if(!RBC_Read(FreeFat.SectorNum,1,CurFatSector))
239 2 return 0x0;
240 2
241 2
C51 COMPILER V7.06 FAT 11/22/2004 22:08:31 PAGE 5
242 2 //clusterNum+=DeviceInfo.BPB_BytesPerSec;
243 2 //DelayMs(10);
244 2 }
245 1 //////////////////////////////////////////////
246 1 if(bFound==0)
247 1 return 0x00;
248 1
249 1 /////////////////////////////////////////////////////////////////////
250 1 xxgFatSecNum=ThisFatSecNum(currentCluster);
251 1 xxgFatEntOffset=ThisFatEntOffset(currentCluster);
252 1
253 1 if(xxgFatSecNum!=FreeFat.SectorNum)
254 1 {
255 2 RBC_Read(xxgFatSecNum,1,DBUF);
256 2
257 2 //FreeFat.OffsetofSector=FreeFat.OffsetofSector+2;
258 2
259 2 DBUF[xxgFatEntOffset]=clusterNum;
260 2 DBUF[xxgFatEntOffset+1]=clusterNum>>8;
261 2 //DelayMs(5);
262 2 if(!RBC_Write(xxgFatSecNum,1,DBUF))
263 2 return 0x00;
264 2 //DelayMs(10);
265 2 if(!RBC_Write(xxgFatSecNum+DeviceInfo.BPB_FATSz16,1,DBUF))
266 2 return 0x00;
267 2 }
268 1 else
269 1 {
270 2 CurFatSector[xxgFatEntOffset]=clusterNum;
271 2 CurFatSector[xxgFatEntOffset+1]=clusterNum>>8;
272 2
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