/**
?*	FATLib.c:		implementation?of?the?FATLib?class.
?*	class?FATLib:	a?portable?FAT?decoder?class?which?is?hardware?independent.
?*			All?hardware?specific?operations?are?abstracted?with?the
?*			class?HAlayer.??The?FATLib?class?operates?with?only?the?buffer
?*			which?it?passes?to?the?class?HAlayer
?*
?*	Author:	Ivan?Sham
?*	Date:?July?1?2004
?*	Version:?2.0
?*	Note:?Developed?for?William?Hue?and?Pete?Rizun
?*
?*****************************************************************
?*??Change?Log
?*----------------------------------------------------------------
?*??Date????|???Author??????????|?Reason?for?change
?*----------------------------------------------------------------
?*?Aug31/04?????William?Hue???????Changed?char?types?to
?*????????????????????????????????unsigned?char.
?*
?*?Jul18/04?????Alex?Jiang????????Made?local?variables?and?functions
?*????????????????????????????????static?and?moved?to?fatlib.c.
?*????????????????????????????????Prefixed?public?functions?with
?*????????????????????????????????“fat_“.
?*
?*?Jan02/05?????William?Hue???????Various?bugfixes?and?clean-up?for
?*????????????????????????????????Circuit?Cellar?article.
?**/

#include?“FATLib.h“


//------------------
//?private?member?variables:
//------------------

/**
?*	defines?the?structure?of?a?opened?file
?**/
typedef?struct
{
	unsigned?long?currentCluster;
	unsigned?int?byteCount;	
	unsigned?long?firstCluster;????
????unsigned?long?fileSize;
????unsigned?long?dirLocation;????
????unsigned?char?sectorCount;????
	signed?char?fileHandle;
????unsigned?char?updateDir;
}?file;


/**
?*	array?of?size?BUFFER_SIZE?of?pointers?to?nodes?of
?*	struct?file?opened?for?reading
?**/
static?file?openedRead[BUFFER_SIZE];

/**
?*	array?of?size?BUFFER_SIZE?of?pointers?to?nodes?of
?*	struct?file?opened?for?writing
?**/
static?file?openedWrite[BUFFER_SIZE];

/**
?*	sectors?offset?from?absolute?sector?0?in?the?MMC/SD.
?*??All?operations?with?the?MMC/SD?card?are?offseted?with
?*	this?variable?in?a?microcontroller?application
?*	****this?equals?zero?in?Windows?application
?**/
unsigned?long?sectorZero;

/**
?*	the?sector?in?the?MMC/SD?card?where?data?starts.
?*	This?is?right?after?the?root?directory?sectors?in?FAT16
?**/
static?unsigned?long?dataStarts;

/**
?*	the?first?sector?where?entries?in?the?root?directory?is
?*	stored?in?FAT16.
?**/
static?unsigned?long?rootDirectory;

/**
?*	the?number?of?sectors?per?File?Allocation?Table?（FAT）
?**/
static?unsigned?long?sectorsPerFAT;

/**
?*	the?number?of?sectors?per?cluster?for?the?MMC/SD?card
?**/
static?unsigned?int?sectorsPerCluster;

/**
?*	the?number?of?reserved?sectors?in?the?MMC/SD?card
?**/
static?unsigned?int?reservedSectors;

/**
?*	the?number?of?File?Allocation?Table?（FAT）?on?the?MMC/SD.
?*	this?is?usually?2
?**/
static?unsigned?int?numOfFATs;

/**
?*	the?number?of?sectors?in?the?section?for?root?directory
?*	entries.
?**/
st

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

?????文件??????61602??2008-06-07?18:48??MSP430_FAT16源碼\Debug\Exe\fat16.d43

?????文件????????321??2008-11-15?19:08??MSP430_FAT16源碼\Debug\Obj\fat16.pbd

?????文件?????149069??2008-06-06?23:42??MSP430_FAT16源碼\Debug\Obj\fatLib.r43

?????文件??????55874??2008-06-06?23:42??MSP430_FAT16源碼\Debug\Obj\HAlayer.r43

?????文件??????15630??2008-06-06?23:42??MSP430_FAT16源碼\Debug\Obj\lcd_ch.r43

?????文件??????39563??2008-06-07?18:48??MSP430_FAT16源碼\Debug\Obj\main.r43

?????文件???????6230??2008-06-06?23:42??MSP430_FAT16源碼\Debug\Obj\USART.r43

?????文件???????5201??2008-11-15?19:25??MSP430_FAT16源碼\fat16.dep

?????文件??????11915??2008-05-29?00:47??MSP430_FAT16源碼\fat16.ewd

?????文件??????44377??2008-06-06?23:42??MSP430_FAT16源碼\fat16.ewp

?????文件????????159??2008-06-25?12:46??MSP430_FAT16源碼\fat16.eww

?????文件??????37565??2008-06-06?23:31??MSP430_FAT16源碼\fatLib.c

?????文件???????5182??2005-01-02?20:54??MSP430_FAT16源碼\fatlib.h

?????文件??????14853??2008-05-29?20:52??MSP430_FAT16源碼\HAlayer.c

?????文件???????9107??2008-05-29?20:06??MSP430_FAT16源碼\HAlayer.h

?????文件????????618??2008-04-12?15:42??MSP430_FAT16源碼\LCD.h

?????文件???????3208??2008-05-30?22:53??MSP430_FAT16源碼\LCD_source\lcd_ch.c

?????文件????????867??2008-04-13?15:09??MSP430_FAT16源碼\LCD_source\lcd_ch.h

?????文件????????618??2008-04-12?15:42??MSP430_FAT16源碼\LCD_source\main_include\LCD.h

?????文件???????6076??2008-06-07?18:48??MSP430_FAT16源碼\main.c

?????文件???????6459??2008-11-15?19:25??MSP430_FAT16源碼\settings\fat16.dbgdt

?????文件????????901??2008-11-15?19:25??MSP430_FAT16源碼\settings\fat16.dni

?????文件???????3543??2008-06-25?12:46??MSP430_FAT16源碼\settings\fat16.wsdt

?????文件???????1300??2004-08-06?11:07??MSP430_FAT16源碼\typedefs.h

?????文件????????295??2008-04-27?21:16??MSP430_FAT16源碼\USART.h

?????文件????????295??2008-04-27?21:16??MSP430_FAT16源碼\USART_source\main_include\USART.h

?????文件???????2418??2008-06-03?00:46??MSP430_FAT16源碼\USART_source\USART.c

?????文件???????1242??2008-05-24?00:55??MSP430_FAT16源碼\USART_source\USART_ch.h

?????目錄??????????0??2009-03-11?23:43??MSP430_FAT16源碼\Debug\Exe

?????目錄??????????0??2009-03-11?23:43??MSP430_FAT16源碼\Debug\List

............此處省略11個文件信息