file.html

fat16文件系统源码。需要的请下

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

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

</TABLE>
<P>
Return the directory data byte at the current position
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:</PRE></TD>

</TABLE>
<HR>
<A NAME="fat_dseek"></A>
<H3> fat_dseek </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#fat_dseek">fat_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>
We consider here that the seek size is minor to the cluster size !!!
if you want to do a more than a cluster seek, issue two successive
dseek commands
<HR>
<A NAME="fat_dseek"></A>
<H3> fat_dseek </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#fat_dseek">fat_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>
We consider here that the seek size is minor to the cluster size !!!
if you want to do a more than a cluster seek, issue two successive
dseek commands
<HR>
<A NAME="fat_fclose"></A>
<H3> fat_fclose </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_fclose">fat_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="fat_fclose"></A>
<H3> fat_fclose </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_fclose">fat_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="fat_fcreate"></A>
<H3> fat_fcreate </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#fat_fcreate">fat_fcreate</A>  ( char  * file_name ,  Byte attribute )  </PRE></TD>

</TABLE>
<P>
Prepare creation of a wav file in the root directory
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>   
return:</PRE></TD>

</TABLE>
<H4> Note </H4>
<P>
This function creates first the free cluster chain from fat1 and then
creates an entry in root directory
<HR>
<A NAME="fat_fcreate"></A>
<H3> fat_fcreate </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#fat_fcreate">fat_fcreate</A>  ( char  * file_name ,  Byte attribute )  </PRE></TD>

</TABLE>
<P>
Prepare creation of a wav file in the root directory
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>   
return:</PRE></TD>

</TABLE>
<H4> Note </H4>
<P>
This function creates first the free cluster chain from fat1 and then
creates an entry in root directory
<HR>
<A NAME="fat_fdelete"></A>
<H3> fat_fdelete </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>Byte <A HREF="#fat_fdelete">fat_fdelete</A>  ( void )  </PRE></TD>

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

</TABLE>
<H4> Note </H4>
<P>
This function works only on a root directory entry
<HR>
<A NAME="fat_fdelete"></A>
<H3> fat_fdelete </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>Byte <A HREF="#fat_fdelete">fat_fdelete</A>  ( void )  </PRE></TD>

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

</TABLE>
<H4> Note </H4>
<P>
This function works only on a root directory entry
<HR>
<A NAME="fat_feob"></A>
<H3> fat_feob </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#fat_feob">fat_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="fat_feob"></A>
<H3> fat_feob </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#fat_feob">fat_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="fat_feof"></A>
<H3> fat_feof </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#fat_feof">fat_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="fat_feof"></A>
<H3> fat_feof </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>bit <A HREF="#fat_feof">fat_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="fat_fetch_file_info"></A>
<H3> fat_fetch_file_info </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_fetch_file_info">fat_fetch_file_info</A>  ( <A HREF="#fat_st_dir_entry">fat_st_dir_entry</A> xdata  * entry ,  bit direction )  </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="fat_fgetc"></A>
<H3> fat_fgetc </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>Byte <A HREF="#fat_fgetc">fat_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="fat_fgetc"></A>
<H3> fat_fgetc </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>Byte <A HREF="#fat_fgetc">fat_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="fat_file_get_pos"></A>
<H3> fat_file_get_pos </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>Uint32 <A HREF="#fat_file_get_pos">fat_file_get_pos</A>  ( void )  </PRE></TD>

</TABLE>
<P>
Calculate the current file position
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:
  current file position in bytes</PRE></TD>

</TABLE>
<HR>
<A NAME="fat_file_get_pos"></A>
<H3> fat_file_get_pos </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>Uint32 <A HREF="#fat_file_get_pos">fat_file_get_pos</A>  ( void )  </PRE></TD>

</TABLE>
<P>
Calculate the current file position
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:
  current file position in bytes</PRE></TD>

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

</TABLE>
<P>
Open the file in read or write mode
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>  mode: READ:   open file for read
        WRITE:  open file for write
*
return:
  - OK: file opened
  - KO: file not opened: - file is empty
                         - low level read error</PRE></TD>

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

</TABLE>
<P>
Open the file in read or write mode
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>  mode: READ:   open file for read
        WRITE:  open file for write
*
return:
  - OK: file opened
  - KO: file not opened: - file is empty
                         - low level read error</PRE></TD>

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

</TABLE>
<P>
Create single FAT12 or FAT16 partition and format the selected memory
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:</PRE></TD>

</TABLE>
<H4> Note </H4>
<P>
- Single partition
- Cluster size is 4 or 8 Kbytes
- Sector size is 512 bytes
- 2 fats management
- 512 entries in the root directory
<HR>
<A NAME="fat_format"></A>
<H3> fat_format </H3>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#D6E8FF"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_format">fat_format</A>  ( void )  </PRE></TD>

</TABLE>
<P>
Create single FAT12 or FAT16 partition and format the selected memory
<P>
<TABLE BORDER="0"  WIDTH="100 %"  BGCOLOR="#FFD0D0"  CELLPADDING="6">
<TR>
 <TD VALIGN=MIDDLE><PRE>*
return:</PRE></TD>

</TABLE>
<H4> Note </H4>
<P>
- Single partition
- Cluster size is 4 or 8 Kbytes