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Fat.LST
资源名称：51-SD.rar [点击查看]
上传用户：jcsy2001
上传日期：2013-11-29
资源大小：201k
文件大小：10k
源码类别：
嵌入式/单片机编程
开发平台：
C/C++
- C51 COMPILER V8.02 FAT 04/29/2007 12:48:52 PAGE 1
- C51 COMPILER V8.02, COMPILATION OF MODULE FAT
- OBJECT MODULE PLACED IN Fat.OBJ
- COMPILER INVOKED BY: D:KeilC51BINC51.EXE Fat.c BROWSE DEBUG OBJECTEXTEND
- line level source
- 1 #include "common.h"
- 2 #include "Fat.h"
- 3 #include "Fat32.h"
- 4 #include "DEVICE.H"
- 5 #include "HAL.H"
- 6 ////////////////////////////////////////
- 7 extern SYS_INFO_BLOCK xdata DeviceInfo;
- 8 extern FILE_INFO xdata ThisFile;
- 9 extern unsigned char xdata DBUF[BUFFER_LENGTH];
- 10 unsigned char xdata FATBUF[512];
- 11 ////////////////////////////////////////
- 12
- 13 unsigned long FirstSectorofCluster(unsigned int clusterNum)
- 14 {
- 15 1 unsigned long temp;
- 16 1 temp=clusterNum-2;
- 17 1 temp=temp*DeviceInfo.BPB_SecPerClus;
- 18 1 temp=temp+DeviceInfo.FirstDataSector;
- 19 1 return temp;
- 20 1 }
- 21
- 22 unsigned int ThisFatSecNum(unsigned int clusterNum)
- 23 {
- 24 1
- 25 1 unsigned int temp;
- 26 1 temp=clusterNum/(DeviceInfo.BPB_BytesPerSec/2);
- 27 1 temp=temp+DeviceInfo.FatStartSector;
- 28 1 return temp;
- 29 1
- 30 1 }
- 31
- 32 unsigned int ThisFatEntOffset(unsigned int clusterNum)
- 33 {
- 34 1 return (clusterNum%(DeviceInfo.BPB_BytesPerSec/2))*2;
- 35 1 }
- 36
- 37 unsigned int GetNextClusterNum(unsigned int clusterNum)
- 38 {
- 39 1 unsigned int FatSecNum,FatEntOffset;
- 40 1
- 41 1 FatSecNum=ThisFatSecNum(clusterNum);
- 42 1 FatEntOffset=ThisFatEntOffset(clusterNum);
- 43 1 if(ThisFile.FatSectorPointer!=FatSecNum)
- 44 1 {
- 45 2
- 46 2 if(!SdReadSector(FatSecNum,1,FATBUF))
- 47 2 return 0xFFFF;
- 48 2 ThisFile.FatSectorPointer=FatSecNum;
- 49 2 }
- 50 1
- 51 1 ///////////////////////////////////////////////////
- 52 1 clusterNum=FATBUF[FatEntOffset+1];
- 53 1 clusterNum=clusterNum<<8;
- 54 1 clusterNum+=FATBUF[FatEntOffset];
- 55 1 return clusterNum;
- C51 COMPILER V8.02 FAT 04/29/2007 12:48:52 PAGE 2
- 56 1 }
- 57
- 58 unsigned char GoToPointer(unsigned long pointer)
- 59 {
- 60 1
- 61 1 unsigned int clusterSize;
- 62 1
- 63 1 clusterSize=DeviceInfo.BPB_SecPerClus*DeviceInfo.BPB_BytesPerSec;
- 64 1 ThisFile.ClusterPointer=ThisFile.StartCluster;
- 65 1 while(pointer>clusterSize)
- 66 1 {
- 67 2 pointer-=clusterSize;
- 68 2 ThisFile.ClusterPointer=GetNextClusterNum(ThisFile.ClusterPointer);
- 69 2 if(ThisFile.ClusterPointer==0xffff)
- 70 2 {
- 71 3 return FALSE;
- 72 3 }
- 73 2 }
- 74 1 ThisFile.SectorofCluster=pointer/DeviceInfo.BPB_BytesPerSec;
- 75 1 ThisFile.SectorPointer=FirstSectorofCluster(ThisFile.ClusterPointer)+ThisFile.SectorofCluster;
- 76 1 ThisFile.OffsetofSector=pointer%DeviceInfo.BPB_BytesPerSec;
- 77 1 ThisFile.FatSectorPointer=0;
- 78 1 return TRUE;
- 79 1
- 80 1 }
- 81
- 82 unsigned char DeleteClusterLink(unsigned int clusterNum)
- 83 {
- 84 1 unsigned int FatSecNum,FatEntOffset;
- 85 1 unsigned char i;
- 86 1 while((clusterNum>1)&&(clusterNum<0xfff0))
- 87 1 {
- 88 2 FatSecNum=ThisFatSecNum(clusterNum);
- 89 2 FatEntOffset=ThisFatEntOffset(clusterNum);
- 90 2 if(SdReadSector(FatSecNum,1,DBUF))
- 91 2 {
- 92 3 if(clusterNum<DeviceInfo.LastFreeCluster) DeviceInfo.LastFreeCluster=clusterNum;
- 93 3 clusterNum=DBUF[FatEntOffset+1];
- 94 3 clusterNum=clusterNum<<8;
- 95 3 clusterNum+=DBUF[FatEntOffset];
- 96 3 }
- 97 2 else
- 98 2 return FALSE;
- 99 2 DBUF[FatEntOffset]=0x00;
- 100 2 DBUF[FatEntOffset+1]=0x00;
- 101 2 for(i=0;i<DeviceInfo.BPB_NumFATs;i++)
- 102 2 {
- 103 3 DelayMs(5);
- 104 3 if(!SdWriteSector(FatSecNum+i*DeviceInfo.BPB_FATSz16,1,DBUF))
- 105 3 return FALSE;
- 106 3 }
- 107 2 }
- 108 1 return TRUE;
- 109 1 }
- 110
- 111 unsigned int GetFreeCusterNum(void)
- 112 {
- 113 1 unsigned int clusterNum,i;
- 114 1 unsigned long sectorNum;
- 115 1 unsigned char j;
- 116 1 clusterNum=0;
- 117 1 // sectorNum=DeviceInfo.FatStartSector;
- C51 COMPILER V8.02 FAT 04/29/2007 12:48:52 PAGE 3
- 118 1
- 119 1 sectorNum=ThisFatSecNum(DeviceInfo.LastFreeCluster);
- 120 1 clusterNum=(sectorNum-DeviceInfo.FatStartSector)*(DeviceInfo.BPB_BytesPerSec/2);
- 121 1
- 122 1 while(sectorNum<DeviceInfo.BPB_FATSz16+DeviceInfo.FatStartSector)
- 123 1 {
- 124 2
- 125 2 if(!SdReadSector(sectorNum,1,DBUF))
- 126 2 return 0x0;
- 127 2 for(i=0;i<DeviceInfo.BPB_BytesPerSec;i=i+2)
- 128 2 {
- 129 3 if((DBUF[i]==0)&&(DBUF[i+1]==0))
- 130 3 {
- 131 4 DBUF[i]=0xff;
- 132 4 DBUF[i+1]=0xff;
- 133 4 for(j=0;j<DeviceInfo.BPB_NumFATs;j++)
- 134 4 {
- 135 5 DelayMs(5);
- 136 5 if(!SdWriteSector(sectorNum+j*DeviceInfo.BPB_FATSz16,1,DBUF))
- 137 5 return FALSE;
- 138 5 }
- 139 4 clusterNum=clusterNum+i/2;
- 140 4 if((clusterNum-2)<DeviceInfo.TotCluster)
- 141 4 {
- 142 5 if(clusterNum>DeviceInfo.LastFreeCluster) DeviceInfo.LastFreeCluster=clusterNum;
- 143 5 return clusterNum;
- 144 5 }
- 145 4 else return FALSE;
- 146 4 }
- 147 3
- 148 3 }
- 149 2 clusterNum+=DeviceInfo.BPB_BytesPerSec/2;
- 150 2 sectorNum++;
- 151 2 DelayMs(1);
- 152 2 }
- 153 1
- 154 1 return 0x0;
- 155 1 }
- 156
- 157 unsigned int CreateClusterLink(unsigned int currentCluster)
- 158 {
- 159 1 unsigned int newCluster;
- 160 1 unsigned int FatSecNum,FatEntOffset;
- 161 1 unsigned char i;
- 162 1
- 163 1 newCluster=GetFreeCusterNum();
- 164 1
- 165 1 if(newCluster==0)
- 166 1 return 0x00;
- 167 1
- 168 1 FatSecNum=ThisFatSecNum(currentCluster);
- 169 1 FatEntOffset=ThisFatEntOffset(currentCluster);
- 170 1 if(SdReadSector(FatSecNum,1,DBUF))
- 171 1 {
- 172 2 DBUF[FatEntOffset]=newCluster;
- 173 2 DBUF[FatEntOffset+1]=newCluster>>8;
- 174 2 for(i=0;i<DeviceInfo.BPB_NumFATs;i++)
- 175 2 {
- 176 3 DelayMs(5);
- 177 3 if(!SdWriteSector(FatSecNum+i*DeviceInfo.BPB_FATSz16,1,DBUF))
- 178 3 return FALSE;
- 179 3 }
- C51 COMPILER V8.02 FAT 04/29/2007 12:48:52 PAGE 4
- 180 2 }
- 181 1 else
- 182 1 return 0x00;
- 183 1
- 184 1 return newCluster;
- 185 1 }
- MODULE INFORMATION: STATIC OVERLAYABLE
- CODE SIZE = 1499 ----
- 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)
