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Fat32.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 FAT32 04/29/2007 12:48:54 PAGE 1
- C51 COMPILER V8.02, COMPILATION OF MODULE FAT32
- OBJECT MODULE PLACED IN Fat32.OBJ
- COMPILER INVOKED BY: D:KeilC51BINC51.EXE Fat32.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 extern unsigned char xdata FATBUF[512];
- 11 ////////////////////////////////////////
- 12
- 13 unsigned long FirstSectorofCluster32(unsigned long 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 long ThisFatSecNum32(unsigned long clusterNum)
- 23 {
- 24 1 unsigned long temp;
- 25 1 temp=clusterNum/(DeviceInfo.BPB_BytesPerSec/4);
- 26 1 temp=temp+DeviceInfo.FatStartSector;
- 27 1 return temp;
- 28 1 }
- 29
- 30 unsigned long ThisFatEntOffset32(unsigned long clusterNum)
- 31 {
- 32 1 return (clusterNum%(DeviceInfo.BPB_BytesPerSec/4))*4;
- 33 1 }
- 34
- 35 unsigned long GetNextClusterNum32(unsigned long clusterNum)
- 36 {
- 37 1 unsigned long FatSecNum,FatEntOffset;
- 38 1
- 39 1 FatSecNum=ThisFatSecNum32(clusterNum);
- 40 1 FatEntOffset=ThisFatEntOffset32(clusterNum);
- 41 1 if(ThisFile.FatSectorPointer!=FatSecNum)
- 42 1 {
- 43 2
- 44 2 if(!SdReadSector(FatSecNum,1,FATBUF))
- 45 2 return 0xFFFFFFFF;
- 46 2 ThisFile.FatSectorPointer=FatSecNum;
- 47 2 }
- 48 1
- 49 1 ///////////////////////////////////////////////////
- 50 1 clusterNum=LSwapINT32(FATBUF[FatEntOffset],FATBUF[FatEntOffset+1],FATBUF[FatEntOffset+2],FATBUF[FatEntOff
- -set+3]);
- 51 1 return clusterNum;
- 52 1 }
- 53
- 54 unsigned char GoToPointer32(unsigned long pointer)
- C51 COMPILER V8.02 FAT32 04/29/2007 12:48:54 PAGE 2
- 55 {
- 56 1
- 57 1 unsigned int clusterSize;
- 58 1
- 59 1 clusterSize=DeviceInfo.BPB_SecPerClus*DeviceInfo.BPB_BytesPerSec;
- 60 1 ThisFile.ClusterPointer=ThisFile.StartCluster;
- 61 1 while(pointer>clusterSize)
- 62 1 {
- 63 2 pointer-=clusterSize;
- 64 2 ThisFile.ClusterPointer=GetNextClusterNum32(ThisFile.ClusterPointer);
- 65 2 if(ThisFile.ClusterPointer==0xffffffff)
- 66 2 {
- 67 3 return FALSE;
- 68 3 }
- 69 2 }
- 70 1 ThisFile.SectorofCluster=pointer/DeviceInfo.BPB_BytesPerSec;
- 71 1 ThisFile.SectorPointer=FirstSectorofCluster32(ThisFile.ClusterPointer)+ThisFile.SectorofCluster;
- 72 1 ThisFile.OffsetofSector=pointer%DeviceInfo.BPB_BytesPerSec;
- 73 1 ThisFile.FatSectorPointer=0;
- 74 1 return TRUE;
- 75 1
- 76 1 }
- 77
- 78 unsigned char DeleteClusterLink32(unsigned long clusterNum)
- 79 {
- 80 1 unsigned long FatSecNum,FatEntOffset;
- 81 1 unsigned char i;
- 82 1 while((clusterNum>1)&&(clusterNum<DeviceInfo.TotCluster))
- 83 1 {
- 84 2 FatSecNum=ThisFatSecNum32(clusterNum);
- 85 2 FatEntOffset=ThisFatEntOffset32(clusterNum);
- 86 2 if(SdReadSector(FatSecNum,1,DBUF))
- 87 2 {
- 88 3 if(clusterNum<DeviceInfo.LastFreeCluster) DeviceInfo.LastFreeCluster=clusterNum;
- 89 3 clusterNum=LSwapINT32(DBUF[FatEntOffset],DBUF[FatEntOffset+1],DBUF[FatEntOffset+2],DBUF[FatEntOffset+3]
- -);
- 90 3 }
- 91 2 else
- 92 2 return FALSE;
- 93 2 DBUF[FatEntOffset]=0x00;DBUF[FatEntOffset+1]=0x00;DBUF[FatEntOffset+2]=0x00;DBUF[FatEntOffset+3]=0x00;
- 94 2 for(i=0;i<DeviceInfo.BPB_NumFATs;i++)
- 95 2 {
- 96 3 DelayMs(5);
- 97 3 if(!SdWriteSector(FatSecNum+i*DeviceInfo.BPB_FATSz32,1,DBUF))
- 98 3 return FALSE;
- 99 3 }
- 100 2 }
- 101 1 return TRUE;
- 102 1 }
- 103
- 104 unsigned long GetFreeCusterNum32(void)
- 105 {
- 106 1 unsigned long xdata clusterNum,i;
- 107 1 unsigned long xdata sectorNum;
- 108 1 unsigned char xdata j;
- 109 1 sectorNum=ThisFatSecNum32(DeviceInfo.LastFreeCluster);
- 110 1 clusterNum=(sectorNum-DeviceInfo.FatStartSector)*(DeviceInfo.BPB_BytesPerSec/4);
- 111 1
- 112 1 while(sectorNum<DeviceInfo.BPB_FATSz32+DeviceInfo.FatStartSector)
- 113 1 {
- 114 2 if(!SdReadSector(sectorNum,1,DBUF))
- 115 2 return 0x0;
- C51 COMPILER V8.02 FAT32 04/29/2007 12:48:54 PAGE 3
- 116 2 for(i=0;i<DeviceInfo.BPB_BytesPerSec;i=i+4)
- 117 2 {
- 118 3 if((DBUF[i]==0)&&(DBUF[i+1]==0)&&(DBUF[i+2]==0)&&(DBUF[i+3]==0))
- 119 3 {
- 120 4 DBUF[i]=0xff;DBUF[i+1]=0xff;DBUF[i+2]=0xff;DBUF[i+3]=0xff;
- 121 4 for(j=0;j<DeviceInfo.BPB_NumFATs;j++)
- 122 4 {
- 123 5 DelayMs(5);
- 124 5 if(!SdWriteSector(sectorNum+j*DeviceInfo.BPB_FATSz32,1,DBUF))
- 125 5 return FALSE;
- 126 5 }
- 127 4 clusterNum=clusterNum+i/4;
- 128 4 if((clusterNum-2)<DeviceInfo.TotCluster)
- 129 4 {
- 130 5 if(clusterNum>DeviceInfo.LastFreeCluster) DeviceInfo.LastFreeCluster=clusterNum;
- 131 5 return clusterNum;
- 132 5 }
- 133 4 else return FALSE;
- 134 4 }
- 135 3 }
- 136 2 clusterNum+=DeviceInfo.BPB_BytesPerSec/4;
- 137 2 sectorNum++;
- 138 2 DelayMs(1);
- 139 2 }
- 140 1 return 0x0;
- 141 1 }
- 142
- 143 unsigned long CreateClusterLink32(unsigned long currentCluster)
- 144 {
- 145 1 unsigned long xdata newCluster;
- 146 1 unsigned long xdata FatSecNum,FatEntOffset;
- 147 1 unsigned char xdata i;
- 148 1
- 149 1 newCluster=GetFreeCusterNum32();
- 150 1
- 151 1 FatSecNum=ThisFatSecNum32(currentCluster);
- 152 1 FatEntOffset=ThisFatEntOffset32(currentCluster);
- 153 1 if(SdReadSector(FatSecNum,1,DBUF))
- 154 1 {
- 155 2 DBUF[FatEntOffset]=newCluster;
- 156 2 DBUF[FatEntOffset+1]=newCluster>>8;
- 157 2 DBUF[FatEntOffset+2]=newCluster>>16;
- 158 2 DBUF[FatEntOffset+3]=newCluster>>24;
- 159 2 for(i=0;i<DeviceInfo.BPB_NumFATs;i++)
- 160 2 {
- 161 3 DelayMs(5);
- 162 3 if(!SdWriteSector(FatSecNum+i*DeviceInfo.BPB_FATSz32,1,DBUF))
- 163 3 return FALSE;
- 164 3 }
- 165 2 }
- 166 1 else
- 167 1 return 0x00;
- 168 1
- 169 1 return newCluster;
- 170 1 }
- MODULE INFORMATION: STATIC OVERLAYABLE
- CODE SIZE = 2330 ----
- CONSTANT SIZE = ---- ----
- XDATA SIZE = ---- 26
- PDATA SIZE = ---- ----
- C51 COMPILER V8.02 FAT32 04/29/2007 12:48:54 PAGE 4
- DATA SIZE = ---- 55
- IDATA SIZE = ---- ----
- BIT SIZE = ---- ----
- END OF MODULE INFORMATION.
- C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
