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fat16文件系统源码。需要的请下

</TABLE>
<P>
Download or upload a sector of 512b
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>  - sector address to load/download   
  - bit to indicate if it's a download or an upload
*
return:</PRE></TD>

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<H4> Note </H4>
<P>
<P>
<HR>
<A NAME="fat_update_buf_fat"></A>
<H3> fat_update_buf_fat </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_update_buf_fat">fat_update_buf_fat</A> ( Uint16 cluster_old ,  Uint16 cluster ,  bit end )  </PRE></TD>

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<P>
This function check if a fat sector have to be writen.
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:</PRE></TD>

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<HR>
<A NAME="fat_update_entry_fat"></A>
<H3> fat_update_entry_fat </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_update_entry_fat">fat_update_entry_fat</A>  ( void )  </PRE></TD>

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<P>
Update root entry and FAT after a writing file session (create or re-write)
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:</PRE></TD>

</TABLE>
<HR>
<A NAME="fat_update_entry_fat"></A>
<H3> fat_update_entry_fat </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_update_entry_fat">fat_update_entry_fat</A>  ( void )  </PRE></TD>

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<P>
Update root entry and FAT after a writing file session (create or re-write)
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:</PRE></TD>

</TABLE>
<HR>
<A NAME="fat_update_fat_sector"></A>
<H3> fat_update_fat_sector </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_update_fat_sector">fat_update_fat_sector</A>  ( Uint16 sector_number )  </PRE></TD>

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<P>
update a sector of fat
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>  sector_number : fat sector position
*
return:</PRE></TD>

</TABLE>
<H4> Note </H4>
<P>
This function check if there is 2 fats to be updated
<HR>
<A NAME="fat_update_fat_sector"></A>
<H3> fat_update_fat_sector </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_update_fat_sector">fat_update_fat_sector</A>  ( Uint16 sector_number )  </PRE></TD>

</TABLE>
<P>
update a sector of fat
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>  sector_number : fat sector position
*
return:</PRE></TD>

</TABLE>
<H4> Note </H4>
<P>
This function check if there is 2 fats to be updated
<HR>
<A NAME="file_entry_dir"></A>
<H3> file_entry_dir </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#file_entry_dir">file_entry_dir</A>  ( Byte id )  </PRE></TD>

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<P>
Enter a directory
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>  id: file type identifier
*
return:
  OK: file type found in dir
  KO: file type not found in dir</PRE></TD>

</TABLE>
<HR>
<A NAME="file_seek_next"></A>
<H3> file_seek_next </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#file_seek_next">file_seek_next</A>  ( Byte id ,  bit loop )  </PRE></TD>

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<P>
Select next file with specified extension
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>  id:   file type identifier
  loop: loop to the first file
*
return:</PRE></TD>

</TABLE>
<HR>
<A NAME="file_seek_prev"></A>
<H3> file_seek_prev </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#file_seek_prev">file_seek_prev</A>  ( Byte id ,  bit loop )  </PRE></TD>

</TABLE>
<P>
Select previous file with specified extension
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>  id: file type identifier
  loop: loop to the last file
*
return:</PRE></TD>

</TABLE>
<H4> Note </H4>
<P>
Depending on the time played, this function selects the previous file
or restarts the file under playing.
<HR>
<A NAME="Hard_write_byte(0x01);"></A>
<H3> Hard_write_byte(0x01); </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 0x06 ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 0x00 ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE></PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>/ *  Reserved  * / </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>for  ( i = 12; i != 0; i-- )  </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 0x00 ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE></PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( FAT_DRIVE_NUMBER ) ;        / *  Driver number  * / </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 0x00 ) ;                    / *  not used  * / </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( FAT_EXT_SIGN ) ;            / *  extended boot signature  * / </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 0x00 ) ;                    / *  volume ID  * / </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 0x00 ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 0x00 ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 0x00 ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 'N' ) ;                     / *  Volume Label  * / </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 'O' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( ' ' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 'N' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 'A' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 'M' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 'E' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( ' ' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( ' ' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( ' ' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( ' ' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 'F' ) ;                     / *  File System Type in ASCII  * / </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 'A' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( 'T' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( '3' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( '2' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( ' ' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( ' ' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>Hard_write_byte ( ' ' ) ; </PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE></PRE></TD>

<TR>
 <TD VALIGN=MIDDLE><PRE>for  ( i = 420/2; i != 0; i-- )               / *  Boot Code  * / </PRE></TD>

</TABLE>
<HR>
<A NAME="iso_check_ext"></A>
<H3> iso_check_ext </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>Byte <A HREF="#iso_check_ext">iso_check_ext</A> ( void )  </PRE></TD>

</TABLE>
<P>
Return the type of the file
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:</PRE></TD>

</TABLE>
<HR>
<A NAME="iso_dgetw"></A>
<H3> iso_dgetw </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>Uint16 <A HREF="#iso_dgetw">iso_dgetw</A> ( void )  </PRE></TD>

</TABLE>
<P>
Read one word from directory
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:
  word read</PRE></TD>

</TABLE>
<H4> Note </H4>
<P>
<P>
<HR>
<A NAME="iso_dseek"></A>
<H3> iso_dseek </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#iso_dseek">iso_dseek</A> ( Int16 offset )  </PRE></TD>

</TABLE>
<P>
Seek from the current position to a new offset computing relative
poisition +/- scan size limited to a 16 bit offset
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>  offset: offset to current position in signed word value
*
return:</PRE></TD>

</TABLE>
<H4> Note </H4>
<P>
<P>
<HR>
<A NAME="iso_fclose"></A>
<H3> iso_fclose </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>void <A HREF="#iso_fclose">iso_fclose</A> ( void )  </PRE></TD>

</TABLE>
<P>
Close opened file
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:</PRE></TD>

</TABLE>
<HR>
<A NAME="iso_feob"></A>
<H3> iso_feob </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#iso_feob">iso_feob</A> ( void )  </PRE></TD>

</TABLE>
<P>
Determine if B position have been reached in mode repeat A/B
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:
  - TRUE : B position have been reached
  - FALSE : B position have not benn reached</PRE></TD>

</TABLE>
<HR>
<A NAME="iso_feof"></A>
<H3> iso_feof </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#iso_feof">iso_feof</A> ( void )  </PRE></TD>

</TABLE>
<P>
Return the file end flag
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:</PRE></TD>

</TABLE>
<HR>
<A NAME="iso_fetch_directory_info"></A>
<H3> iso_fetch_directory_info </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>void <A HREF="#iso_fetch_directory_info">iso_fetch_directory_info</A>  ( <A HREF="#iso_file">iso_file</A>  * entry )  </PRE></TD>

</TABLE>
<P>
Get information about a directory or file entry
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>  entry: directory entry structure
*
return:</PRE></TD>

</TABLE>
<H4> Note </H4>
<P>
<P>
<HR>
<A NAME="iso_fgetc"></A>
<H3> iso_fgetc </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>Byte <A HREF="#iso_fgetc">iso_fgetc</A> ( void )  </PRE></TD>

</TABLE>
<P>
Read one byte from file
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:
  byte read</PRE></TD>

</TABLE>
<H4> Note </H4>
<P>
As this function is called very often it must be short and optimized
in execution time
<HR>
<A NAME="iso_file_get_pos"></A>
<H3> iso_file_get_pos </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>Uint32 <A HREF="#iso_file_get_pos">iso_file_get_pos</A> ( void )  </PRE></TD>

</TABLE>
<P>
Calculate the current file position
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGC