📄 fat32.lst
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C51 COMPILER V7.07 FAT32 07/13/2007 21:38:27 PAGE 1
C51 COMPILER V7.07, COMPILATION OF MODULE FAT32
OBJECT MODULE PLACED IN D:\HEX\Fat32.obj
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE Fat32.c BROWSE DEBUG OBJECTEXTEND OBJECT(D:\HEX\Fat32.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 extern unsigned char xdata FATBUF[512];
12 //*****************************************************************
13 //根据文件开始簇号计算文件的逻辑扇区号
14 //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
15 //入口参数： clusterNum 蔟号
16 unsigned long FirstSectorofCluster32(unsigned long 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 //根据簇号计算
25 unsigned long ThisFatSecNum32(unsigned long clusterNum)
26 {
27 1 unsigned long temp;
28 1 temp=clusterNum*4;
29 1 temp=temp/DeviceInfo.BPB_BytesPerSec;
30 1 temp=temp+DeviceInfo.FatStartSector;
31 1 return temp;
32 1 }
33
34 unsigned long ThisFatEntOffset32(unsigned long clusterNum)
35 {
36 1 unsigned long temp1,temp2;
37 1 temp1=4*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 long GetNextClusterNum32(unsigned long clusterNum)
44 {
45 1 unsigned long FatSecNum,FatEntOffset;
46 1
47 1 FatSecNum=ThisFatSecNum32(clusterNum);
48 1 FatEntOffset=ThisFatEntOffset32(clusterNum);
49 1 if(ThisFile.FatSectorPointer!=FatSecNum)
50 1 {
51 2
52 2 if(!RBC_Read(FatSecNum,1,FATBUF))
53 2 return 0xFFFFFFFF;
54 2 ThisFile.FatSectorPointer=FatSecNum;
55 2 }
C51 COMPILER V7.07 FAT32 07/13/2007 21:38:27 PAGE 2
56 1
57 1 ///////////////////////////////////////////////////
58 1 clusterNum=LSwapINT32(FATBUF[FatEntOffset],FATBUF[FatEntOffset+1],FATBUF[FatEntOffset+2],FATBUF[FatEntOff
-set+3]);
59 1 return clusterNum;
60 1 }
61
62 unsigned char GoToPointer32(unsigned long pointer)
63 {
64 1
65 1 unsigned int clusterSize;
66 1
67 1 clusterSize=DeviceInfo.BPB_SecPerClus*DeviceInfo.BPB_BytesPerSec;
68 1 ThisFile.ClusterPointer=ThisFile.StartCluster;
69 1 while(pointer>clusterSize)
70 1 {
71 2 pointer-=clusterSize;
72 2 ThisFile.ClusterPointer=GetNextClusterNum32(ThisFile.ClusterPointer);
73 2 if(ThisFile.ClusterPointer==0xffffffff)
74 2 {
75 3 return FALSE;
76 3 }
77 2 }
78 1 ThisFile.SectorofCluster=pointer/DeviceInfo.BPB_BytesPerSec;
79 1 ThisFile.SectorPointer=FirstSectorofCluster32(ThisFile.ClusterPointer)+ThisFile.SectorofCluster;
80 1 ThisFile.OffsetofSector=pointer-ThisFile.SectorofCluster*DeviceInfo.BPB_BytesPerSec;
81 1 ThisFile.FatSectorPointer=0;
82 1 return TRUE;
83 1
84 1 }
85
86 unsigned char DeleteClusterLink32(unsigned long clusterNum)
87 {
88 1 unsigned long FatSecNum,FatEntOffset;
89 1 unsigned char i;
90 1 while((clusterNum>1)&&(clusterNum<DeviceInfo.TotCluster))
91 1 {
92 2 FatSecNum=ThisFatSecNum32(clusterNum);
93 2 FatEntOffset=ThisFatEntOffset32(clusterNum);
94 2 if(RBC_Read(FatSecNum,1,DBUF))
95 2 clusterNum=LSwapINT32(DBUF[FatEntOffset],DBUF[FatEntOffset+1],DBUF[FatEntOffset+2],DBUF[FatEntOffset+3])
-;
96 2 else
97 2 return FALSE;
98 2 DBUF[FatEntOffset]=0x00;DBUF[FatEntOffset+1]=0x00;DBUF[FatEntOffset+2]=0x00;DBUF[FatEntOffset+3]=0x00;
99 2 for(i=0;i<DeviceInfo.BPB_NumFATs;i++)
100 2 {
101 3 DelayMs(5);
102 3 if(!RBC_Write(FatSecNum+i*DeviceInfo.BPB_FATSz32,1,DBUF))
103 3 return FALSE;
104 3 }
105 2 }
106 1 return TRUE;
107 1 }
108 //
109 unsigned long GetFreeCusterNum32(void)
110 {
111 1 unsigned long xdata clusterNum,i;
112 1 unsigned long xdata sectorNum;
113 1 unsigned char xdata j;
114 1 clusterNum=0;
115 1 sectorNum=DeviceInfo.FatStartSector; //文件分配表(FAT)开始扇区
C51 COMPILER V7.07 FAT32 07/13/2007 21:38:27 PAGE 3
116 1 while(sectorNum<DeviceInfo.BPB_FATSz32+DeviceInfo.FatStartSector)//仅在一个文件分配表中创建文件
117 1 {
118 2 if(!RBC_Read(sectorNum,1,DBUF)) //读一个扇区数据
119 2 return 0x0;
120 2 for(i=0;i<DeviceInfo.BPB_BytesPerSec;i=i+4) //FAT32
121 2 {
122 3 if((DBUF[i]==0)&&(DBUF[i+1]==0)&&(DBUF[i+2]==0)&&(DBUF[i+3]==0))
123 3 {
124 4 DBUF[i]=0xff;DBUF[i+1]=0xff;DBUF[i+2]=0xff;DBUF[i+3]=0xff;
125 4 for(j=0;j<DeviceInfo.BPB_NumFATs;j++)
126 4 {
127 5 DelayMs(5);
128 5 if(!RBC_Write(sectorNum+j*DeviceInfo.BPB_FATSz32,1,DBUF))
129 5 return FALSE;
130 5 }
131 4 return clusterNum;
132 4 }
133 3 clusterNum++;
134 3 }
135 2 sectorNum=4*clusterNum/DeviceInfo.BPB_BytesPerSec+DeviceInfo.FatStartSector;
136 2 DelayMs(10);
137 2 }
138 1 return 0x0;
139 1 }
140 //创建蔟链表
141 //
142 unsigned long CreateClusterLink32(unsigned long currentCluster)
143 {
144 1 unsigned long xdata newCluster;
145 1 unsigned long xdata FatSecNum,FatEntOffset;
146 1 unsigned char xdata i;
147 1
148 1 newCluster=GetFreeCusterNum32();
149 1
150 1 FatSecNum=ThisFatSecNum32(currentCluster);
151 1 FatEntOffset=ThisFatEntOffset32(currentCluster);
152 1 if(RBC_Read(FatSecNum,1,DBUF))
153 1 {
154 2 DBUF[FatEntOffset]=newCluster;
155 2 DBUF[FatEntOffset+1]=newCluster>>8;
156 2 DBUF[FatEntOffset+2]=newCluster>>16;
157 2 DBUF[FatEntOffset+3]=newCluster>>24;
158 2 for(i=0;i<DeviceInfo.BPB_NumFATs;i++)
159 2 {
160 3 DelayMs(5);
161 3 if(!RBC_Write(FatSecNum+i*DeviceInfo.BPB_FATSz32,1,DBUF))
162 3 return FALSE;
163 3 }
164 2 }
165 1 else
166 1 return 0x00;
167 1
168 1 return newCluster;
169 1 }
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 2089 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- 26
PDATA SIZE = ---- ----
DATA SIZE = ---- 63
C51 COMPILER V7.07 FAT32 07/13/2007 21:38:27 PAGE 4
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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