#include?“SD.h“
#include?“FAT.h“


//FAT系統信息
unsigned?long?FATOffset;	//FAT表的起始絕對扇區號
unsigned?long?RDTOffset;	//RDT表的起始絕對扇區號
unsigned?long?DataOffset;	//Data區的起始絕對扇區號
unsigned?int??MaxCluster;	//最大的簇序號FAT16
unsigned?int??RDTEntryNum;	//根目錄項數
unsigned?char?ClusterSize;	//每簇扇區數

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//將一個16位數按字節倒序
void?Swap16（unsigned?int?*Var）
{
	*Var?=?（（*Var?&?0xFF00）>>8?|?（*Var?&?0x00FF）<<8）;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//將一個32位數按字節倒序
void?Swap32（unsigned?long?*Var）
{
	*Var?=?（（*Var?&?0xFF000000）>>24?|?（*Var?&?0x00FF0000）>>8?|?（*Var?&?0x0000FF00）<<8?|?（*Var?&?0x000000FF）<<24）;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//讀取并計算SD卡文件系統信息，返回0x00時操作成功，0xFF時出錯。
unsigned?char?InitFAT（）
{	//FAT文件系統參數
	unsigned?long?RelSector;
	unsigned?long?TotalSector;
	unsigned?int??ReservedSector;
	unsigned?char?FATNum;
	unsigned?int??FATSize;
	
	//初始化SD卡
	if（InitSD（）!=0x00）?return?0xFF;
	
	//讀取FAT文件系統參數
	if（0x00?!=?ReadSectorPartial（0?454?4?（unsigned?char?*）&RelSector））?return?0xFF;
	Swap32（&RelSector）;
	if（0x00?!=?ReadSectorPartial（0?458?4?（unsigned?char?*）&TotalSector））?return?0xFF;
	Swap32（&TotalSector）;
	if（0x00?!=?ReadSectorPartial（RelSector?14?2?（unsigned?char?*）&ReservedSector））?return?0xFF;
	Swap16（&ReservedSector）;
	if（0x00?!=?ReadSectorPartial（RelSector?13?1?&ClusterSize））?return?0xFF;
	if（0x00?!=?ReadSectorPartial（RelSector?16?1?&FATNum））?return?0xFF;
	if（0x00?!=?ReadSectorPartial（RelSector?17?2?（unsigned?char?*）&RDTEntryNum））?return?0xFF;
	Swap16（&RDTEntryNum）;
	if（0x00?!=?ReadSectorPartial（RelSector?22?2?（unsigned?char?*）&FATSize））?return?0xFF;
	Swap16（&FATSize）;

	//計算FAT系統信息
	FATOffset?=?RelSector?+?ReservedSector;
	RDTOffset?=?FATOffset?+?FATNum?*?FATSize;
	DataOffset?=?RDTOffset?+?（RDTEntryNum?*?32）?/?512;
	MaxCluster?=?（unsigned?int）（（TotalSector?+?1?-?DataOffset）?/?ClusterSize?+?1）;

	return?0x00;	//初始化成功
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//在SD卡根目錄下查找指定文件，返回0x00時操作成功，0xFF時出錯。
//參數pFile為文件結構體指針；pFileName為要查找的文件名。
//文件名長11字節；前8個為文件名，不足8字節的在后面補空格；后3字節為文件后綴；所有字符為ASCII碼大寫字符。
unsigned?char?FileOpen（PFILE?pFile?char?*pFileName）
{
	unsigned?int?Entry?EntrySecOffset;
	unsigned?long?EntrySector;
	unsigned?char?i;
	idata?char?FileName[11];
	
	for（Entry=0;?Entry	{	//計算Entry的起始位置
		EntrySector?=?（Entry?*?32）?/?512?+?RDTOffset;
		EntrySecOffset?=?（Entry?*?32）?%?512;
		//讀取Entry的前11字節
		if（0x00?!=?ReadSectorPartial（EntrySector?EntrySecOffset?11?FileName））?return?0xFF;
		//比較文件名
		for（i=0;?i<11;?i++）
		{
			if（FileName[i]?!=?*（pFileName+i））?bre

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????749??2006-10-05?11:27??SDCard\STARTUP.OBJ

?????文件???????5115??2002-04-16?14:32??SDCard\STARTUP.A51

?????文件???????8468??2006-10-05?11:24??SDCard\FAT.c

?????文件????????164??2007-09-06?15:37??SDCard\SD.plg

?????文件???????1699??2006-06-30?10:32??SDCard\MAIN.bak

?????文件???????4127??2006-10-05?11:27??SDCard\main.LST

?????文件???????2254??2006-10-05?10:03??SDCard\SD_Uv2.Bak

?????文件???????7424??2006-10-05?11:27??SDCard\main.OBJ

?????文件???????1549??2006-07-12?17:05??SDCard\main.c

?????文件??????11200??2006-10-05?11:27??SDCard\SD.LST

?????文件???????3267??2006-10-05?09:52??SDCard\SD.bak

?????文件????????689??2006-10-05?10:09??SDCard\FAT.h

?????文件??????14472??2006-10-05?11:27??SDCard\FAT.LST

?????文件??????26095??2006-10-05?11:27??SDCard\FAT.OBJ

?????文件???????3333??2006-10-05?09:57??SDCard\SD.h

?????文件???????8467??2006-10-05?11:24??SDCard\FAT.c.bak

?????文件???????4758??2006-10-05?09:42??SDCard\SD.c

?????文件??????11679??2006-10-05?11:27??SDCard\STARTUP.LST

?????文件???????1566??2006-06-30?15:18??SDCard\main.c.bak

?????文件????????679??2006-10-05?10:06??SDCard\FAT.h.bak

?????文件???????4762??2006-10-05?09:40??SDCard\SD.c.bak

?????文件???????4912??2006-06-26?10:45??SDCard\FAT.bak

?????文件????????100??2006-10-05?11:28??SDCard\SD.lnp

?????文件??????35652??2006-10-05?11:28??SDCard\SD.M51

?????文件??????15782??2006-10-05?11:28??SDCard\SD.hex

?????文件???????3334??2006-10-05?09:57??SDCard\SD.h.bak

?????文件???????1120??2006-10-05?10:03??SDCard\SD_Opt.Bak

?????文件??????17059??2006-10-05?11:27??SDCard\SD.OBJ

?????文件??????45712??2006-10-05?11:28??SDCard\SD

?????文件???????2299??2007-09-06?15:37??SDCard\SD.Uv2

............此處省略5個文件信息