file_sys.c

这个是我调通的在2410下运行文件系统的程序. 用2410驱动sd卡来实现fat文件系统. 欢迎大家来测试. 用法很简单, 如下 FILE *fp // 文件指针

/*
	Progressive Resources LLC

			FlashFile

	Version : 	2.00
	Date: 		11/01/2004
	Author: 	Erick M. Higa

	Revision History:
	12/31/2003 - EMH - v1.00
			   	 	 - Initial Release
	01/19/2004 - EMH - v1.10
			   	 	 - Fixed FAT access errors by allowing both FAT tables to be updated
					 - Fixed erase_cluster chain to stop if chain goes to '0'
					 - Fixed #include's so other non m128 processors could be used
					 - Fixed fcreate to match 'C' standard for function "creat"
					 - Fixed fseek so it would not error when in "READ" mode
					 - Modified SPI interface to use _FF_spi() so it is more universal
					   (see the "sd_cmd.c" file for the function used)
					 - Redifined global variables and #defines for more unique names
					 - Added string functions fputs, fputsc, & fgets
					 - Added functions fquickformat, fgetfileinfo, & GetVolID()
					 - Added directory support
					 - Modified delays in "sd_cmd.c" to increase transfer speed to max
					 - Updated "options.h" to include additions, and to make #defines
					   more universal to multiple platforms
	01/21/2004 - EMH - v1.20
			   	 	 - Added ICC Support to the FlashFileSD
					 - Fixed card initialization error for MMC/SD's that have only a boot
			   	 	   sector and no partition table
					 - Fixed intermittant error on fcreate when creating existing file
					 - Changed "options.h" to #include all required files
	02/19/2004 - EMH - v1.21
					 - Replaced all "const" refrances to "flash" to support CodeVision 1.24.1b
	03/02/2004 - EMH - v1.22 (unofficial release)
					 - Changed Directory Functions to allow for multi-cluster directory entries
					 - Added function addr_to_clust() to support long directories
					 - Fixed FAT table address calculation to support multiple reserved sectors
					   (previously) assumed one reserved sector, if XP formats card sometimes
					   multiple reserved sectors - thanks YW
	03/10/2004 - EMH - v1.30
					 - Added support for a Compact Flash package
					 - Renamed read and write to flash function names for multiple media support
	03/26/2004 - EMH - v1.31
					 - Added define for easy MEGA128Dev board setup
					 - Changed demo projects so "option.h" is in the project directory
	04/01/2004 - EMH - v1.32
					 - Fixed bug in "prev_cluster()" that didn't use updated FAT table address
					   calculations.  (effects XP formatted cards see v1.22 notes)
	05/07/2004 - EMH - v1.33
					 - Fixed bug in "fflush()" and "fopen()" that was incorrectly handling blank
					   files on certain MMC/SD cards.
	05/17/2004 - EMH - v1.34
					 - Fixed bug "fopen()" that was incorrectly writing to 0xFE00 + _FF_DIR_ADDR
					   if opening a file in "WRITE" mode (bug since v1.22).
					 - Fixed bug in "append_toc()" that was incorrectly updating the time/date
					   stamp if _RTC_ON_ is NOT defined.
	05/17/2004 - EMH - v1.40
					 - Added IAR EWAVR Support to the FlashFile
	06/14/2004 - EMH - v1.41
					 - Fixed bug in "fflush()" that was incorrectly saving the last sector of a
					   cluster to the first if saving or closing a file at the end of file AND at
					   the end of a cluster.
	11/01/2004 - EMH - v2.00
					 - Changing code to use structures and unions to optimize code to run faster
					   and use less code space.
					 - Fixed bug in fgets() that was reading too long if the line was >= n, and
					   it was returning the wrong pointer.
					 - Changing code to use sector addressing rather than direct memory addressing
					   to save code space and speed up time.
					 - Added _DIRECTORIES_SUPPORTED_ switch to options.h to enable or disable (less
					   code space) the use of directories.
					 - Added _NO_MALLOC_ switch to options.h to enable or disable the need of a
					   malloc() function.
					 - Added _BytsPerSec_512_ switch to options.h to enable or disable the BPB_BytsPerSec
					   variable.  In all current flash media, there are 512 bytes per sector, and there
					   really is no need to have it as a variable.  Enabling _BytsPerSec_512_ will hard
					   code all references to BPB_BytsPerSec as 0x200 or 512.  This will cut down on code
					   space and speed the functions up a bit since << 9 and >> 9 can replace * 512 and
					   / 512, and & 0x1FF can replace % 512.
					 - Fixed bug in addr_to_clust() that was checking if sector # was <= FirstDataSector
					   where it should just be < FirstDataSector.
					 - Added ability in initialize_media() for the calculations to look for the first
					   partition location in all four partition entry spaces rather than just the first.
					 - Fixed bug in scan_directory() that did not always 0xE5 as an empty file location.
					 - Fixed Directory support (scan_directory(), fcreate(), and mkdir()) so that multi 
					   cluster sub-directories could be read.
					 - Fixed Initialization of the File Structure that was intermittantly causing errors in 
					   fopen() and fcreate().
					 - Fixed bug in fcreatec(), fopenc(), and fget_file_infoc() that was not always handling 
					   full length filenames of files correctly.
					 - Combined code so that CodeVision, ImageCraft, and IAR all use the same base code.
					 - Updated fprintf() in ImageCraft and IAR versions so that the use vsprintf and can be 
					   used just like a printf().
					 - Added fread() and fwrite() functions.

	Software License
	The use of Progressive Resources LLC FlashFile Source Package indicates
	your understanding and acceptance of the following terms and conditions.
	This license shall supersede any verbal or prior verbal or written, statement
	or agreement to the contrary. If you do not understand or accept these terms,
	or your local regulations prohibit "after sale" license agreements or limited
	disclaimers, you must cease and desist using this product immediately.
	This product is