📄 fat.lst
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C51 COMPILER V7.07 FAT 07/13/2007 21:38:22 PAGE 1
C51 COMPILER V7.07, COMPILATION OF MODULE FAT
OBJECT MODULE PLACED IN D:\HEX\Fat.obj
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE Fat.c BROWSE DEBUG OBJECTEXTEND OBJECT(D:\HEX\Fat.obj)
stmt level source
1 #include "common.h"
2 #include "Fat.h"
3 #include "Fat32.h"
4 #include "SL811.H"
5 #include "TPBULK.H"
6 #include "HAL.H"
7 ////////////////////////////////////////
8 extern SYS_INFO_BLOCK xdata DeviceInfo;
9 extern FILE_INFO xdata ThisFile;
10 extern unsigned char xdata DBUF[BUFFER_LENGTH];
11 unsigned char xdata FATBUF[512];
12 ////////////////////////////////////////
13 //*****************************************************************
14 //根据文件开始簇号计算文件的逻辑扇区号
15 //计算公式： 开始逻辑扇区号=（蔟号-2）*每簇扇区数+数据区开始逻辑扇区号
16 unsigned long FirstSectorofCluster(unsigned int clusterNum)
17 {
18 1 unsigned long temp;
19 1 temp=clusterNum-2;
20 1 temp=temp*DeviceInfo.BPB_SecPerClus;
21 1 temp=temp+DeviceInfo.FirstDataSector;
22 1 return temp;
23 1 }
24
25 unsigned int ThisFatSecNum(unsigned int clusterNum)
26 {
27 1 unsigned int temp;
28 1 temp=clusterNum*2;
29 1 temp=temp/DeviceInfo.BPB_BytesPerSec;
30 1 temp=temp+DeviceInfo.FatStartSector;
31 1 return temp;
32 1 }
33
34 unsigned int ThisFatEntOffset(unsigned int clusterNum)
35 {
36 1 unsigned int temp1,temp2;
37 1 temp1=2*clusterNum;
38 1 temp2=temp1/DeviceInfo.BPB_BytesPerSec;
39 1 temp1=temp1-temp2*DeviceInfo.BPB_BytesPerSec;
40 1 return temp1;
41 1 }
42
43 unsigned int GetNextClusterNum(unsigned int clusterNum)
44 {
45 1 unsigned int FatSecNum,FatEntOffset;
46 1
47 1 FatSecNum=ThisFatSecNum(clusterNum);
48 1 FatEntOffset=ThisFatEntOffset(clusterNum);
49 1 if(ThisFile.FatSectorPointer!=FatSecNum)
50 1 {
51 2
52 2 if(!RBC_Read(FatSecNum,1,FATBUF))
53 2 return 0xFFFF;
54 2 ThisFile.FatSectorPointer=FatSecNum;
55 2 }
C51 COMPILER V7.07 FAT 07/13/2007 21:38:22 PAGE 2
56 1
57 1 ///////////////////////////////////////////////////
58 1 clusterNum=FATBUF[FatEntOffset+1];
59 1 clusterNum=clusterNum<<8;
60 1 clusterNum+=FATBUF[FatEntOffset];
61 1 return clusterNum;
62 1 }
63
64 unsigned char GoToPointer(unsigned long pointer)
65 {
66 1
67 1 unsigned int clusterSize;
68 1
69 1 clusterSize=DeviceInfo.BPB_SecPerClus*DeviceInfo.BPB_BytesPerSec;
70 1 ThisFile.ClusterPointer=ThisFile.StartCluster;
71 1 while(pointer>clusterSize)
72 1 {
73 2 pointer-=clusterSize;
74 2 ThisFile.ClusterPointer=GetNextClusterNum(ThisFile.ClusterPointer);
75 2 if(ThisFile.ClusterPointer==0xffff)
76 2 {
77 3 return FALSE;
78 3 }
79 2 }
80 1 ThisFile.SectorofCluster=pointer/DeviceInfo.BPB_BytesPerSec;
81 1 ThisFile.SectorPointer=FirstSectorofCluster(ThisFile.ClusterPointer)+ThisFile.SectorofCluster;
82 1 ThisFile.OffsetofSector=pointer-ThisFile.SectorofCluster*DeviceInfo.BPB_BytesPerSec;
83 1 ThisFile.FatSectorPointer=0;
84 1 return TRUE;
85 1
86 1 }
87
88 unsigned char DeleteClusterLink(unsigned int clusterNum)
89 {
90 1 unsigned int FatSecNum,FatEntOffset;
91 1 unsigned char i;
92 1 while((clusterNum>1)&&(clusterNum<0xfff0))
93 1 {
94 2 FatSecNum=ThisFatSecNum(clusterNum);
95 2 FatEntOffset=ThisFatEntOffset(clusterNum);
96 2 if(RBC_Read(FatSecNum,1,DBUF))
97 2 {
98 3 clusterNum=DBUF[FatEntOffset+1];
99 3 clusterNum=clusterNum<<8;
100 3 clusterNum+=DBUF[FatEntOffset];
101 3 }
102 2 else
103 2 return FALSE;
104 2 DBUF[FatEntOffset]=0x00;
105 2 DBUF[FatEntOffset+1]=0x00;
106 2 for(i=0;i<DeviceInfo.BPB_NumFATs;i++)
107 2 {
108 3 DelayMs(5);
109 3 if(!RBC_Write(FatSecNum+i*DeviceInfo.BPB_FATSz16,1,DBUF))
110 3 return FALSE;
111 3 }
112 2 }
113 1 return TRUE;
114 1 }
115
116 unsigned int GetFreeCusterNum(void)
117 {
C51 COMPILER V7.07 FAT 07/13/2007 21:38:22 PAGE 3
118 1 unsigned int clusterNum,i;
119 1 unsigned long sectorNum;
120 1 unsigned char j;
121 1 clusterNum=0;
122 1 sectorNum=DeviceInfo.FatStartSector;
123 1 while(sectorNum<DeviceInfo.BPB_FATSz16+DeviceInfo.FatStartSector)
124 1 {
125 2
126 2 if(!RBC_Read(sectorNum,1,DBUF))
127 2 return 0x0;
128 2 for(i=0;i<DeviceInfo.BPB_BytesPerSec;i=i+2)
129 2 {
130 3 if((DBUF[i]==0)&&(DBUF[i+1]==0))
131 3 {
132 4 DBUF[i]=0xff;
133 4 DBUF[i+1]=0xff;
134 4 for(j=0;j<DeviceInfo.BPB_NumFATs;j++)
135 4 {
136 5 DelayMs(5);
137 5 if(!RBC_Write(sectorNum+j*DeviceInfo.BPB_FATSz16,1,DBUF))
138 5 return FALSE;
139 5 }
140 4 return clusterNum;
141 4 }
142 3 clusterNum++;
143 3 }
144 2
145 2 sectorNum=2*clusterNum/DeviceInfo.BPB_BytesPerSec+DeviceInfo.FatStartSector;
146 2 DelayMs(10);
147 2 }
148 1
149 1 return 0x0;
150 1 }
151
152 unsigned int CreateClusterLink(unsigned int currentCluster)
153 {
154 1 unsigned int newCluster;
155 1 unsigned int FatSecNum,FatEntOffset;
156 1 unsigned char i;
157 1
158 1 newCluster=GetFreeCusterNum();
159 1
160 1 if(newCluster==0)
161 1 return 0x00;
162 1
163 1 FatSecNum=ThisFatSecNum(currentCluster);
164 1 FatEntOffset=ThisFatEntOffset(currentCluster);
165 1 if(RBC_Read(FatSecNum,1,DBUF))
166 1 {
167 2 DBUF[FatEntOffset]=newCluster;
168 2 DBUF[FatEntOffset+1]=newCluster>>8;
169 2 for(i=0;i<DeviceInfo.BPB_NumFATs;i++)
170 2 {
171 3 DelayMs(5);
172 3 if(!RBC_Write(FatSecNum+i*DeviceInfo.BPB_FATSz16,1,DBUF))
173 3 return FALSE;
174 3 }
175 2 }
176 1 else
177 1 return 0x00;
178 1
179 1 return newCluster;
C51 COMPILER V7.07 FAT 07/13/2007 21:38:22 PAGE 4
180 1 }
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 1337 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = 512 ----
PDATA SIZE = ---- ----
DATA SIZE = ---- 41
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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