fat_8h-source.html

avr应用测试程序

00272         BYTE bpbSectors[2];         <span class="comment">// total number of sectors</span>
00273         BYTE bpbMedia;              <span class="comment">// media descriptor</span>
00274         BYTE bpbFATsecs[2];         <span class="comment">// number of sectors per FAT</span>
00275         BYTE bpbSecPerTrack[2];     <span class="comment">// sectors per track</span>
00276         BYTE bpbHeads[2];           <span class="comment">// number of heads</span>
00277         BYTE bpbHiddenSecs[4];      <span class="comment">// # of hidden sectors</span>
00278         BYTE bpbHugeSectors[4];     <span class="comment">// # of sectors if bpbSectors == 0</span>
00279         BYTE bpbBigFATsecs[4];      <span class="comment">// like bpbFATsecs for FAT32</span>
00280         BYTE bpbExtFlags[2];        <span class="comment">// extended flags:</span>
00281         BYTE bpbFSVers[2];          <span class="comment">// filesystem version</span>
00282         BYTE bpbRootClust[4];       <span class="comment">// start cluster for root directory</span>
00283         BYTE bpbFSInfo[2];          <span class="comment">// filesystem info structure sector</span>
00284         BYTE bpbBackup[2];          <span class="comment">// backup boot sector</span>
00285         <span class="comment">// There is a 12 byte filler here, but we ignore it</span>
00286 };
00287 
00288 <span class="comment">// FAT32 FSInfo block.</span>
00289 <span class="keyword">struct </span>fsinfo {
00290         BYTE fsisig1[4];
00291         BYTE fsifill1[480];
00292         BYTE fsisig2[4];
00293         BYTE fsinfree[4];
00294         BYTE fsinxtfree[4];
00295         BYTE fsifill2[12];
00296         BYTE fsisig3[4];
00297         BYTE fsifill3[508];
00298         BYTE fsisig4[4];
00299 };
00300 
00301 
00302 <span class="comment">/***************************************************************/</span>
00303 <span class="comment">/***************************************************************/</span>
00304 
00305 
00306 <span class="comment">// Structure of a dos directory entry.</span>
00307 <span class="keyword">struct </span>direntry {
00308         BYTE        deName[8];      <span class="comment">// filename, blank filled</span>
00309 <span class="preprocessor">#define SLOT_EMPTY      0x00            // slot has never been used</span>
00310 <span class="preprocessor"></span><span class="preprocessor">#define SLOT_E5         0x05            // the real value is 0xE5</span>
00311 <span class="preprocessor"></span><span class="preprocessor">#define SLOT_DELETED    0xE5            // file in this slot deleted</span>
00312 <span class="preprocessor"></span>        BYTE        deExtension[3]; <span class="comment">// extension, blank filled</span>
00313         BYTE        deAttributes;   <span class="comment">// file attributes</span>
00314 <span class="preprocessor">#define ATTR_NORMAL     0x00            // normal file</span>
00315 <span class="preprocessor"></span><span class="preprocessor">#define ATTR_READONLY   0x01            // file is readonly</span>
00316 <span class="preprocessor"></span><span class="preprocessor">#define ATTR_HIDDEN     0x02            // file is hidden</span>
00317 <span class="preprocessor"></span><span class="preprocessor">#define ATTR_SYSTEM     0x04            // file is a system file</span>
00318 <span class="preprocessor"></span><span class="preprocessor">#define ATTR_VOLUME     0x08            // entry is a volume label</span>
00319 <span class="preprocessor"></span><span class="preprocessor">#define ATTR_LONG_FILENAME  0x0F        // this is a long filename entry                </span>
00320 <span class="preprocessor"></span><span class="preprocessor">#define ATTR_DIRECTORY  0x10            // entry is a directory name</span>
00321 <span class="preprocessor"></span><span class="preprocessor">#define ATTR_ARCHIVE    0x20            // file is new or modified</span>
00322 <span class="preprocessor"></span>        BYTE        deLowerCase;    <span class="comment">// NT VFAT lower case flags  (set to zero)</span>
00323 <span class="preprocessor">#define LCASE_BASE      0x08            // filename base in lower case</span>
00324 <span class="preprocessor"></span><span class="preprocessor">#define LCASE_EXT       0x10            // filename extension in lower case</span>
00325 <span class="preprocessor"></span>        BYTE        deCHundredth;   <span class="comment">// hundredth of seconds in CTime</span>
00326         BYTE        deCTime[2];     <span class="comment">// create time</span>
00327         BYTE        deCDate[2];     <span class="comment">// create date</span>
00328         BYTE        deADate[2];     <span class="comment">// access date</span>
00329         WORD        deHighClust;    <span class="comment">// high bytes of cluster number</span>
00330         BYTE        deMTime[2];     <span class="comment">// last update time</span>
00331         BYTE        deMDate[2];     <span class="comment">// last update date</span>
00332         WORD        deStartCluster; <span class="comment">// starting cluster of file</span>
00333         DWORD       deFileSize;     <span class="comment">// size of file in bytes</span>
00334 };
00335 
00336 <span class="comment">// number of directory entries in one sector</span>
00337 <span class="preprocessor">#define DIRENTRIES_PER_SECTOR   0x10</span>
00338 <span class="preprocessor"></span>
00339 <span class="comment">// Structure of a Win95 long name directory entry</span>
00340 <span class="keyword">struct </span>winentry {
00341         BYTE        weCnt;          <span class="comment">// </span>
00342 <span class="preprocessor">#define WIN_LAST        0x40</span>
00343 <span class="preprocessor"></span><span class="preprocessor">#define WIN_CNT         0x3f</span>
00344 <span class="preprocessor"></span>        BYTE        wePart1[10];
00345         BYTE        weAttributes;
00346 <span class="preprocessor">#define ATTR_WIN95      0x0f</span>
00347 <span class="preprocessor"></span>        BYTE        weReserved1;
00348         BYTE        weChksum;
00349         BYTE        wePart2[12];
00350         WORD        weReserved2;
00351         BYTE        wePart3[4];
00352 };
00353 
00354 <span class="preprocessor">#define WIN_ENTRY_CHARS 13      // Number of chars per winentry</span>
00355 <span class="preprocessor"></span>
00356 <span class="comment">// Maximum filename length in Win95</span>
00357 <span class="comment">// Note: Must be &lt; sizeof(dirent.d_name)</span>
00358 <span class="preprocessor">#define WIN_MAXLEN      255</span>
00359 <span class="preprocessor"></span>
00360 <span class="comment">// This is the format of the contents of the deTime field in the direntry</span>
00361 <span class="comment">// structure.</span>
00362 <span class="comment">// We don't use bitfields because we don't know how compilers for</span>
00363 <span class="comment">// arbitrary machines will lay them out.</span>
00364 <span class="preprocessor">#define DT_2SECONDS_MASK        0x1F    // seconds divided by 2</span>
00365 <span class="preprocessor"></span><span class="preprocessor">#define DT_2SECONDS_SHIFT       0</span>
00366 <span class="preprocessor"></span><span class="preprocessor">#define DT_MINUTES_MASK         0x7E0   // minutes</span>
00367 <span class="preprocessor"></span><span class="preprocessor">#define DT_MINUTES_SHIFT        5</span>
00368 <span class="preprocessor"></span><span class="preprocessor">#define DT_HOURS_MASK           0xF800  // hours</span>
00369 <span class="preprocessor"></span><span class="preprocessor">#define DT_HOURS_SHIFT          11</span>
00370 <span class="preprocessor"></span>
00371 <span class="comment">// This is the format of the contents of the deDate field in the direntry</span>
00372 <span class="comment">// structure.</span>
00373 <span class="preprocessor">#define DD_DAY_MASK             0x1F    // day of month</span>
00374 <span class="preprocessor"></span><span class="preprocessor">#define DD_DAY_SHIFT            0</span>
00375 <span class="preprocessor"></span><span class="preprocessor">#define DD_MONTH_MASK           0x1E0   // month</span>
00376 <span class="preprocessor"></span><span class="preprocessor">#define DD_MONTH_SHIFT          5</span>
00377 <span class="preprocessor"></span><span class="preprocessor">#define DD_YEAR_MASK            0xFE00  // year - 1980</span>
00378 <span class="preprocessor"></span><span class="preprocessor">#define DD_YEAR_SHIFT           9</span>
00379 <span class="preprocessor"></span>
00380 <span class="comment">// Stuctures</span>
00381 <span class="keyword">struct </span>FileInfoStruct
00382 {
00383     <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> StartCluster;         <span class="comment">//&lt; file starting cluster for last file accessed</span>
00384     <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> Size;                 <span class="comment">//&lt; file size for last file accessed</span>
00385     <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> Attr;                 <span class="comment">//&lt; file attr for last file accessed</span>
00386     <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> CreateTime;          <span class="comment">//&lt; file creation time for last file accessed</span>
00387     <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> CreateDate;          <span class="comment">//&lt; file creation date for last file accessed</span>
00388 };
00389 
00390 <span class="comment">// Prototypes</span>
00391 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> fatInit( <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> device);
00392 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> fatClusterSize(<span class="keywordtype">void</span>);
00393 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> fatGetDirEntry(<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> entry);
00394 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> fatChangeDirectory(<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> entry);
00395 <span class="keywordtype">void</span> fatPrintDirEntry(<span class="keywordtype">void</span>);
00396 <span class="keywordtype">void</span> fatDumpDirSlot(<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> entry);
00397 <span class="keyword">struct </span>FileInfoStruct* fatGetFileInfo(<span class="keywordtype">void</span>);
00398 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> fatGetFilesize(<span class="keywordtype">void</span>);
00399 <span class="keywordtype">char</span>* fatGetFilename(<span class="keywordtype">void</span>);
00400 <span class="keywordtype">char</span>* fatGetDirname(<span class="keywordtype">void</span>);
00401 <span class="keywordtype">void</span> fatLoadCluster(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> cluster, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buffer);
00402 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> fatNextCluster(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> cluster);
00403 
00404 <span class="preprocessor">#endif</span>
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:06 2006 for Procyon AVRlib by&nbsp;
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