#include?“common.h“
#include?“Fat.h“
#include?“Fat32.h“
#include?“DEVICE.H“
#include?“HAL.H“
////////////////////////////////////////
extern?SYS_INFO_BLOCK?xdata?DeviceInfo;
extern?FILE_INFO?xdata?ThisFile;
extern?unsigned?char?xdata?DBUF[BUFFER_LENGTH];
unsigned?char?xdata?FATBUF[512];
////////////////////////////////////////

unsigned?long?FirstSectorofCluster（unsigned?int?clusterNum）
{
	unsigned?long?temp;
	temp=clusterNum-2;
	temp=temp*DeviceInfo.BPB_SecPerClus;
	temp=temp+DeviceInfo.FirstDataSector;
	return?temp;
}

unsigned?int?ThisFatSecNum（unsigned?int?clusterNum）
{

???unsigned?int?temp;
???temp=clusterNum/（DeviceInfo.BPB_BytesPerSec/2）;
???temp=temp+DeviceInfo.FatStartSector;
???return?temp;

}

unsigned?int?ThisFatEntOffset（unsigned?int?clusterNum）
{????
	return?（clusterNum%（DeviceInfo.BPB_BytesPerSec/2））*2;
}

unsigned?int?GetNextClusterNum（unsigned?int?clusterNum）
{
	unsigned?int?FatSecNumFatEntOffset;
	
	FatSecNum=ThisFatSecNum（clusterNum）;
	FatEntOffset=ThisFatEntOffset（clusterNum）;
	if（ThisFile.FatSectorPointer!=FatSecNum）
	{	
		
		if（!SdReadSector（FatSecNum1FATBUF））
			return?0xFFFF;
		ThisFile.FatSectorPointer=FatSecNum;
	}
	
	///////////////////////////////////////////////////
	clusterNum=FATBUF[FatEntOffset+1];
	clusterNum=clusterNum<<8;
	clusterNum+=FATBUF[FatEntOffset];	
	return?clusterNum;
}

unsigned?char?GoToPointer（unsigned?long?pointer）
{
	
	unsigned?int?clusterSize;
	
	clusterSize=DeviceInfo.BPB_SecPerClus*DeviceInfo.BPB_BytesPerSec;
	ThisFile.ClusterPointer=ThisFile.StartCluster;
	while（pointer>clusterSize）
	{
		pointer-=clusterSize;	
		ThisFile.ClusterPointer=GetNextClusterNum（ThisFile.ClusterPointer）;
		if（ThisFile.ClusterPointer==0xffff）
		{
		return?FALSE;
		}
	}
	ThisFile.SectorofCluster=pointer/DeviceInfo.BPB_BytesPerSec;
	ThisFile.SectorPointer=FirstSectorofCluster（ThisFile.ClusterPointer）+ThisFile.SectorofCluster;
	ThisFile.OffsetofSector=pointer%DeviceInfo.BPB_BytesPerSec;
	ThisFile.FatSectorPointer=0;
	return?TRUE;
	
}

unsigned?char?DeleteClusterlink（unsigned?int?clusterNum）
{
	unsigned?int?FatSecNumFatEntOffset;
	unsigned?char?i;
	while（（clusterNum>1）&&（clusterNum<0xfff0））
	{
	FatSecNum=ThisFatSecNum（clusterNum）;
	FatEntOffset=ThisFatEntOffset（clusterNum）;
	if（SdReadSector（FatSecNum1DBUF））
		{
		?if（clusterNum		?clusterNum=DBUF[FatEntOffset+1];
		?clusterNum=clusterNum<<8;
		?clusterNum+=DBUF[FatEntOffset];		?
		}
	else
		return?FALSE;
	DBUF[FatEntOffset]=0x00;
	DBUF[FatEntOffset+1]=0x00;	
	for（i=0;i		{
		DelayMs（5）;
		if（!SdWriteSector（FatSecNum+i*DeviceInfo.BPB_FATSz161DBUF））
			return?FALSE;
		}	
	}
	return?TRUE;
}

unsigned?int?GetFreeCusterNum（void）
{
	unsigned?int?clusterNumi;
	unsigned?long?sectorNum;
	unsigned?char?j;
	clusterNum=0;
//	sectorNum=DeviceInfo.FatStartSector;

????

?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
-----------?---------??----------?-----??----

?????文件???????6523??2003-12-13?06:09??51讀寫(xiě)SD卡源碼\AT89X52.H

?????文件?????191538??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\C51_UsbDisk

?????文件??????77873??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\C51_UsbDisk.hex

?????文件????????162??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\C51_UsbDisk.lnp

?????文件?????136944??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\C51_UsbDisk.M51

?????文件???????4084??2007-05-04?19:29??51讀寫(xiě)SD卡源碼\C51_UsbDisk.Opt

?????文件????????164??2007-05-04?19:29??51讀寫(xiě)SD卡源碼\C51_UsbDisk.plg

?????文件???????2336??2007-04-25?16:24??51讀寫(xiě)SD卡源碼\C51_UsbDisk.Uv2

?????文件???????4084??2007-04-29?12:49??51讀寫(xiě)SD卡源碼\C51_UsbDisk_Opt.Bak

?????文件???????2217??2006-08-19?09:52??51讀寫(xiě)SD卡源碼\C51_UsbDisk_Uv2.Bak

?????文件???????1078??2000-01-14?08:46??51讀寫(xiě)SD卡源碼\common.h

?????文件???????4046??2007-04-27?15:59??51讀寫(xiě)SD卡源碼\DEVICE.C

?????文件???????2055??2006-08-14?10:45??51讀寫(xiě)SD卡源碼\DEVICE.H

?????文件???????7343??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\DEVICE.LST

?????文件??????17248??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\DEVICE.OBJ

?????文件???????4625??2005-02-27?01:37??51讀寫(xiě)SD卡源碼\Fat.c

?????文件????????503??2004-05-08?04:04??51讀寫(xiě)SD卡源碼\Fat.h

?????文件??????10042??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\Fat.LST

?????文件??????21154??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\Fat.OBJ

?????文件???????4842??2005-02-27?01:39??51讀寫(xiě)SD卡源碼\Fat32.c

?????文件????????540??2003-06-01?07:54??51讀寫(xiě)SD卡源碼\Fat32.h

?????文件???????9941??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\Fat32.LST

?????文件??????23232??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\Fat32.OBJ

?????文件???????5070??2005-02-28?09:03??51讀寫(xiě)SD卡源碼\HAL.C

?????文件????????905??2005-02-28?21:28??51讀寫(xiě)SD卡源碼\HAL.H

?????文件???????9751??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\HAL.LST

?????文件??????14789??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\HAL.OBJ

?????文件??????30566??2007-04-26?09:56??51讀寫(xiě)SD卡源碼\HPI.C

?????文件???????1229??2003-06-04?09:34??51讀寫(xiě)SD卡源碼\hpi.H

?????文件??????77477??2007-04-29?12:48??51讀寫(xiě)SD卡源碼\HPI.LST

............此處省略16個(gè)文件信息