file_sys.c~

This fat 16 can be used for logging function. The user can use it for logger device.

/***************************** C SOURCE FILE *********************************
**
**  Project:    FlashFile
**  Filename:   FILE_SYS.C 
**  Version:    3.0.1 
**  Date:       April 7, 2006
**  
******************************************************************************
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******************************************************************************
**
**  VERSION HISTORY:
**  ----------------
**  Version:    1.00
**  Date:       December 31, 2003
**  Revised by: Erick M. Higa
**  Description:
**      - Original version.
**
**  Version:    1.10
**  Date:       January 19, 2004
**  Revised by: Erick M. Higa
**  Description:
**      - 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.
**
**  Version:    1.20
**  Date:       January 21, 2004
**  Revised by: Erick M. Higa
**  Description:
**      - 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.
**
**  Version:    1.30
**  Date:       March 10, 2004
**  Revised by: Erick M. Higa
**  Description:
**      - Replaced all "const" references to "flash" to support CodeVisionAVR 
**        v1.24.1b and above.
**      - 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
**      - Added support for a Compact Flash package.
**      - Renamed read and write to flash function names for multiple media 
**        support.
**
**  Version:    1.31
**  Date:       March 26, 2004
**  Revised by: Erick M. Higa
**  Description:
**      - Added define for easy MEGA128Dev board setup
**      - Changed demo projects so "option.h" is in the project directory
**
**  Version:    1.32
**  Date:       April 1, 2004
**  Revised by: Erick M. Higa
**  Description:
**      - Fixed bug in "prev_cluster()" that didn't use updated FAT table 
**        address calculations.  (effects XP formatted cards see v1.30 notes).
**
**  Version:    1.33
**  Date:       May 7, 2004
**  Revised by: Erick M. Higa
**  Description:
**      - Fixed bug in "fflush()" and "fopen()" that was incorrectly handling 
**        blank files on certain MMC/SD cards.
**
**  Version:    1.40
**  Date:       May 17, 2004
**  Revised by: Erick M. Higa
**  Description:
**      - Fixed bug "fopen()" that was incorrectly writing to 0xFE00 + 
**        _FF_DirAddr 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.
**      - Added IAR EWAVR Support to the FlashFile.
**
**  Version:    1.41
**  Date:       June 14, 2004
**  Revised by: Erick M. Higa
**  Description:
**      - 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.
**
**  Version:    2.00
**  Date:       November 4, 2004
**  Revised by: Erick M. Higa
**  Description:
**      - 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 _BYTES_PER_SEC_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 _BYTES_PER_SEC_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 _FF_printf().
**      - Added fread() and fwrite() functions.
**
**  Version:    2.01
**  Date:       January 27, 2005
**  Revised by: Erick M. Higa
**  Description:
**      - Fixed bug in scan_directory(), fopen(), fcreate(), rename(), and 
**        get_file_info() that gave compile errors when 
**        _DIRECTORIES_SUPPORTED_ was not defined.
**      - Corrected return value of rename() to 0 when successful (previously 
**        returned a 1)
**
**  Version:    2.02
**  Date:       February 10, 2005
**  Revised by: Erick M. Higa
**  Description:
**      - Fixed error in wrong files uploaded in v2.01
**      - Changed initialize_media() in "sd_cmd.c"/"cf_cmd.c" so that if an 
**        active partition is not found in the partition table, it will assume 
**        that the first partition entry is valid, and use that to calculate 
**        the Boot Sector of the disk.
**      - Changed "options.h" file to fix compile errors when using 
**        CodeVisionAVR v1.24.4 and above.
**
**  Version:    2.03
**  Date:       March 11, 2005
**  Revised by: Erick M. Higa
**  Description:
**      - Updated "options.h" to define _FF_MAX_FILES_OPEN, for use when 
**        malloc() is not used (_NO_MALLOC_ is #defined) so the FlashFile will 
**        automatically allocate the n FILE structures into global variable 
**        space, where n is the number of files to be opened simultaneously 
**        defined by _FF_MAX_FILES_OPEN.
**      - Fixed bug in fopen() that caused the first sector of a file to be 
**        wrongly updated when opened in APPEND mode for IAR and ICC users.
**
**  Version:    2.10
**  Date:       June 7, 2005
**  Revised by: Erick M. Higa
**  Description:
**      - Major change in accessing directory entries using structures and 
**        unions to cut down on code size.  Effects all functions that access 
**        the directory entries (scan_directory(), read_directory(), 
**        append_toc(), mkdir(), rmdir(), chdir(), _FF_chdir(), fopen(), 
**        fcreate(), remove(), and rename()).
**      - Changed internal functions so that most internal FlashFile functions