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<!DOCTYPE <h <t <link </head><body> <!-- <div <h 00002 00003 00004 00005 00006 00007 00008 00009 00010 00011 00012 00013 00014 00015 00016 00017 00018 00019 00020 00021 00022 00023 00024 00025 00026 00027 00028 00029 00030 00031 00032 00033 00034 00035 00036 00037 00038 00039 00040 00041 00042 00043 00044 00045 00046 00047 00048 00049 00050 00051 00052 00053 00054 00055 00056 00057 00058 00059 00060 00061 00062 00063 { 00064 00065 } 00066 00067 00068 { 00069 00070 00071 } 00072 00073 00074 { 00075 00076 00077 00078 00079 00080 00081 00082 00083 00084 00085 00086 00087 00088 00089 00090 00091 00092 00093 00094 { 00095 00096 00097 } 00098 00099 { 00100 00101 00102 } 00103 00104 00105 00106 00107 00108 { 00109 00110 00111 00112 00113 00114 00115 00116 00117 00118 00119 00120 00121 00122 00123 00124 00125 00126 00127 00128 00129 00130 } 00131 00132 00133 00134 00135 00136 00137 00138 00139 00140 00141 { 00142 00143 00144 00145 00146 00147 00148 00149 00150 00151 00152 00153 00154 00155 00156 00157 00158 00159 00160 00161 00162 } 00163 00164 00165 00166 00167 00168 00169 00170 00171 00172 00173 00174 00175 00176 00177 00178 } 00179 00180 00181 00182 00183 { 00184 00185 00186 00187 00188 00189 00190 00191 00192 00193 00194 00195 00196 00197 00198 gotEntry = 0; 00199 00200 00201 00202 00203 00204 { 00205 00206 { 00207 00208 00209 00210 } 00211 00212 00213 00214 { 00215 00216 00217 00218 } 00219 00220 { 00221 00222 00223 } 00224 00225 { 00226 00227 00228 00229 { 00230 00231 00232 00233 00234 00235 00236 00237 00238 00239 00240 00241 } 00242 00243 { 00244 00245 00246 00247 00248 00249 { 00250 00251 00252 00253 00254 00255 00256 00257 00258 00259 00260 } 00261 00262 { 00263 00264 00265 00266 00267 00268 00269 00270 00271 00272 00273 00274 00275 00276 00277 00278 00279 } 00280 } 00281 } 00282 00283 de++; 00284 00285 index++; 00286 } 00287 00288 00289 00290 00291 00292 00293 00294 00295 00296 00297 00298 00299 00300 00301 00302 } 00303 00304 00305 00306 { 00307 00308 00309 { 00310 00311 00312 { 00313 00314 00315 00316 { 00317 00318 00319 } 00320 00321 { 00322 00323 00324 00325 00326 } 00327 00328 00329 00330 00331 00332 00333 } 00334 00335 { 00336 00337 00338 } 00339 } 00340 00341 { 00342 00343 00344 } 00345 } 00346 00347 00348 { 00349 00350 00351 00352 00353 00354 00355 00356 00357 00358 00359 00360 00361 00362 00363 00364 00365 00366 00367 00368 00369 00370 00371 00372 00373 00374 00375 00376 00377 00378 00379 00380 00381 } 00382 00383 00384 { 00385 00386 00387 00388 00389 00390 00391 } 00392 00393 00394 { 00395 00396 } 00397 00398 00399 00400 { 00401 00402 } 00403 00404 00405 00406 { 00407 00408 } 00409 00410 00411 00412 { 00413 00414 } 00415 00416 00417 00418 { 00419 00420 00421 00422 00423 { 00424 00425 00426 00427 00428 } 00429 } 00430 00431 00432 00433 00434 { 00435 00436 00437 00438 00439 00440 00441 00442 00443 { 00444 00445 00446 00447 00448 } 00449 00450 { 00451 00452 00453 00454 00455 } 00456 00457 00458 00459 00460 00461 00462 00463 00464 { 00465 00466 00467 00468 } 00469 00470 00471 00472 00473 00474 00475 00476 00477 00478 00479 00480 00481 00482 00483 00484 } </ <a <img </body> </html>

HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> tml><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> itle>Procyon AVRlib: fat.c Source File</title> href="dox.css" rel="stylesheet" type="text/css"> Generated by Doxygen 1.4.2 --> class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data Structures</a> | <a class="qindex" href="dirs.html">Directories</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Data Fields</a> | <a class="qindex" href="globals.html">Globals</a> | <a class="qindex" href="pages.html">Related Pages</a></div> 1>fat.c</h1><a href="fat_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 /*! \file fat.c \brief FAT16/32 file system driver. */ //***************************************************************************** // // File Name : 'fat.c' // Title : FAT16/32 file system driver // Author : Pascal Stang // Date : 11/07/2000 // Revised : 12/12/2000 // Version : 0.3 // Target MCU : ATmega103 (should work for Atmel AVR Series) // Editor Tabs : 4 // // This code is based in part on work done by Jesper Hansen for his // YAMPP MP3 player project. // // NOTE: This code is currently below version 1.0, and therefore is considered // to be lacking in some functionality or documentation, or may not be fully // tested. Nonetheless, you can expect most functions to work. // // This code is distributed under the GNU Public License // which can be found at http://www.gnu.org/licenses/gpl.txt // //***************************************************************************** #include <avr/io.h> #include <avr/pgmspace.h> #include <string.h> #include "<a class="code" href="ata_8h.html">ata.h</a>" #include "<a class="code" href="rprintf_8h.html">rprintf.h</a>" #include "<a class="code" href="debug_8h.html">debug.h</a>" #include "<a class="code" href="fat_8h.html">fat.h</a>" #include "<a class="code" href="fatconf_8h.html">fatconf.h</a>" // globals // buffers unsigned char *SectorBuffer = (unsigned char *) FAT_SECTOR_BUFFER_ADDR; unsigned char *FileNameBuffer = (unsigned char *) FAT_FILENAME_BUFFER_ADDR; unsigned char *PathNameBuffer = (unsigned char *) FAT_PATHNAME_BUFFER_ADDR; // filesystem constants/metrics struct partrecord PartInfo; unsigned char Fat32Enabled; unsigned long FirstDataSector; unsigned short BytesPerSector; unsigned short SectorsPerCluster; unsigned long FirstFATSector; unsigned long RootDirStartCluster; // operating variables unsigned long CurrentDirStartCluster; //< current directory starting cluster struct FileInfoStruct FileInfo; //< file information for last file accessed unsigned long FatInCache = 0; /*************************************************************************/ /*************************************************************************/ unsigned long fatClustToSect(unsigned long clust) return ((clust-2) * SectorsPerCluster) + FirstDataSector; unsigned int fatClusterSize(void) // return the number of sectors in a disk cluster return SectorsPerCluster; unsigned char fatInit( unsigned char device) //struct partrecord *pr; struct bpb710 *bpb; // read partition table // TODO.... error checking ataReadSectors(DRIVE0, 0, 1, SectorBuffer); // map first partition record // save partition information to global PartInfo PartInfo = *((struct partrecord *) ((struct partsector *) SectorBuffer)->psPart); // PartInfo = *pr; // Read the Partition BootSector // **first sector of partition in PartInfo.prStartLBA ataReadSectors( DRIVE0, PartInfo.prStartLBA, 1, SectorBuffer ); bpb = (struct bpb710 *) ((struct bootsector710 *) SectorBuffer)->bsBPB; // setup global disk constants FirstDataSector = PartInfo.prStartLBA; if(bpb->bpbFATsecs) // bpbFATsecs is non-zero and is therefore valid FirstDataSector += bpb->bpbResSectors + bpb->bpbFATs * bpb->bpbFATsecs; else // bpbFATsecs is zero, real value is in bpbBigFATsecs FirstDataSector += bpb->bpbResSectors + bpb->bpbFATs * bpb->bpbBigFATsecs; SectorsPerCluster = bpb->bpbSecPerClust; BytesPerSector = bpb->bpbBytesPerSec; FirstFATSector = bpb->bpbResSectors + PartInfo.prStartLBA; switch (PartInfo.prPartType) case PART_TYPE_DOSFAT16: case PART_TYPE_FAT16: case PART_TYPE_FAT16LBA: // first directory cluster is 2 by default (clusters range 2->big) RootDirStartCluster = CLUST_FIRST; // push data sector pointer to end of root directory area //FirstDataSector += (bpb->bpbRootDirEnts)/DIRENTRIES_PER_SECTOR; Fat32Enabled = FALSE; break; case PART_TYPE_FAT32LBA: case PART_TYPE_FAT32: // bpbRootClust field exists in FAT32 bpb710, but not in lesser bpb's RootDirStartCluster = bpb->bpbRootClust; // push data sector pointer to end of root directory area // need this? FirstDataSector += (bpb->bpbRootDirEnts)/DIRENTRIES_PER_SECTOR; Fat32Enabled = TRUE; break; default: <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Found: No Partition!\r\n"); //return 1; break; // set current directory to root (\) CurrentDirStartCluster = RootDirStartCluster; PathNameBuffer[0] = '\\'; PathNameBuffer[1] = 0; // do debug #ifdef DEBUG_FAT switch (PartInfo.prPartType) case PART_TYPE_DOSFAT16: <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Found: DOSFAT 16\r\n"); break; case PART_TYPE_FAT16: <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Found: FAT16\r\n"); break; case PART_TYPE_FAT16LBA: <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Found: FAT16 LBA\r\n"); break; case PART_TYPE_FAT32LBA: <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Found: FAT32 LBA\r\n"); break; case PART_TYPE_FAT32: <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Found: FAT32\r\n"); //return 1; break; default: <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Found: No Partition!\r\n"); //return 1; break; <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("First sector : "); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(PartInfo.prStartLBA); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Size : "); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(PartInfo.prSize); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("bytes/sector : "); <a class="code" href="group__rprintf.html#ga8">rprintfu16</a>(bpb->bpbBytesPerSec); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("sectors/cluster : "); <a class="code" href="group__rprintf.html#ga7">rprintfu08</a>(bpb->bpbSecPerClust); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("reserved sectors: "); <a class="code" href="group__rprintf.html#ga8">rprintfu16</a>(bpb->bpbResSectors); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("FatSectors : "); <a class="code" href="group__rprintf.html#ga8">rprintfu16</a>(bpb->bpbFATsecs); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("BigFatSectors : "); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(bpb->bpbBigFATsecs); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Number of Fats : "); <a class="code" href="group__rprintf.html#ga7">rprintfu08</a>(bpb->bpbFATs); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("First Fat Sector: "); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(FirstFATSector); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("First Data Sect : "); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(FirstDataSector); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("RootDirStartClus: "); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(RootDirStartCluster); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); #endif return 0; ////////////////////////////////////////////////////////////// unsigned char fatGetDirEntry(unsigned short entry) unsigned long sector; struct direntry *de = 0; // avoid compiler warning by initializing struct winentry *we; unsigned char haveLongNameEntry; unsigned char gotEntry; unsigned short b; int i,index; char *fnbPtr; unsigned short entrycount = 0; // read dir data sector = fatClustToSect(CurrentDirStartCluster); haveLongNameEntry = 0; index = 16; // crank it up //while(entrycount < entry) while(1) if(index == 16) // time for next sector ? ataReadSectors( DRIVE0, sector++, 1, SectorBuffer); de = (struct direntry *) SectorBuffer; index = 0; // check the status of this directory entry slot if(de->deName[0] == 0x00) // slot is empty and this is the end of directory gotEntry = 0; break; else if(de->deName[0] == 0xE5) // this is an empty slot // do nothing and move to the next one else // this is a valid and occupied entry // is it a part of a long file/dir name? if(de->deAttributes == ATTR_LONG_FILENAME) // we have a long name entry // cast this directory entry as a "windows" (LFN: LongFileName) entry we = (struct winentry *) de; b = WIN_ENTRY_CHARS*( (we->weCnt-1) & 0x0f); // index into string fnbPtr = &FileNameBuffer[b]; for (i=0;i<5;i++) *fnbPtr++ = we->wePart1[i*2]; // copy first part for (i=0;i<6;i++) *fnbPtr++ = we->wePart2[i*2]; // second part for (i=0;i<2;i++) *fnbPtr++ = we->wePart3[i*2]; // and third part if (we->weCnt & WIN_LAST) *fnbPtr = 0; // in case dirnamelength is multiple of 13, add termination if ((we->weCnt & 0x0f) == 1) haveLongNameEntry = 1; // flag that we have a complete long name entry set else // we have a short name entry // check if this is the short name entry corresponding // to the end of a multi-part long name entry if(haveLongNameEntry) // a long entry name has been collected if(entrycount == entry) { // desired entry has been found, break out gotEntry = 1; break; } // otherwise haveLongNameEntry = 0; // clear long name flag entrycount++; // increment entry counter else // entry is a short name (8.3 format) without a // corresponding multi-part long name entry fnbPtr = FileNameBuffer; for (i=0;i<8;i++) *fnbPtr++ = de->deName[i]; // copy name *fnbPtr++ = '.'; // insert '.' for (i=0;i<3;i++) *fnbPtr++ = de->deExtension[i]; // copy extension *fnbPtr = 0; // null-terminate if(entrycount == entry) { // desired entry has been found, break out gotEntry = 1; break; } // otherwise entrycount++; // increment entry counter // next directory entry // next index // we have a file/dir to return // store file/dir starting cluster (start of data) FileInfo.StartCluster = (unsigned long) ((unsigned long)de->deHighClust << 16) + de->deStartCluster; // store file/dir size // (note: size field for subdirectory entries is always zero) FileInfo.Size = de->deFileSize; // store file/dir attributes FileInfo.Attr = de->deAttributes; // store file/dir creation time FileInfo.CreateTime = de->deCTime[0] | de->deCTime[1]<<8; // store file/dir creation date FileInfo.CreateTime = de->deCDate[0] | de->deCDate[1]<<8; return gotEntry; // change directory into unsigned char fatChangeDirectory(unsigned short entry) // get the requested directory entry if( fatGetDirEntry(entry) ) // make sure the entry is a directory if(FileInfo.Attr & ATTR_DIRECTORY) // change directories into this directory // check to see if we are changing back to root directory if(FileInfo.StartCluster) // standard change directory CurrentDirStartCluster = FileInfo.StartCluster; else // if startCluster pointer is zero, // a change to the root directory is intended // change directory to root CurrentDirStartCluster = RootDirStartCluster; // TODO: handle pathname properly for going up a directory // set path string strcat(PathNameBuffer, FileNameBuffer); strcat(PathNameBuffer, "\\"); // return success return TRUE; else // not a directory, cannot CD into a file! return FALSE; else // not a valid entry, cannot CD! return FALSE; void fatPrintDirEntry(void) // print a formatted dir-style output for most recent file // print date <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 2, FALSE, '0', (FileInfo.CreateDate&DD_MONTH_MASK)>>DD_MONTH_SHIFT ); // month <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('/'); <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 2, FALSE, '0', (FileInfo.CreateDate&DD_DAY_MASK)>>DD_DAY_SHIFT ); // day <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('/'); <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 4, FALSE, '0', (FileInfo.CreateDate&DD_YEAR_MASK)>>DD_YEAR_SHIFT ); // year <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(' '); // print time <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 2, FALSE, '0', (FileInfo.CreateTime&DT_HOURS_MASK)>>DT_HOURS_SHIFT ); // month <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(':'); <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 2, FALSE, '0', (FileInfo.CreateTime&DT_MINUTES_MASK)>>DT_MINUTES_SHIFT ); // day <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(':'); <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 2, FALSE, '0', 2*(FileInfo.CreateTime&DT_2SECONDS_MASK)>>DT_2SECONDS_SHIFT ); // seconds <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(' '); // print attributes if(FileInfo.Attr & ATTR_VOLUME) <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('V'); else <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('-'); if(FileInfo.Attr & ATTR_DIRECTORY) <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('D'); else <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('-'); if(FileInfo.Attr & ATTR_READONLY) <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('R'); else <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('-'); if(FileInfo.Attr & ATTR_HIDDEN) <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('H'); else <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('-'); if(FileInfo.Attr & ATTR_SYSTEM) <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('S'); else <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('-'); if(FileInfo.Attr & ATTR_ARCHIVE) <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('A'); else <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>('-'); <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(' '); // print filesize <a class="code" href="group__rprintf.html#ga10">rprintfNum</a>(10, 8, FALSE, ' ', FileInfo.Size); // filesize <a class="code" href="group__rprintf.html#ga1">rprintfChar</a>(' '); // print filename <a class="code" href="group__rprintf.html#ga2">rprintfStr</a>(FileNameBuffer); void fatDumpDirSlot(unsigned short slot) unsigned long sector; // load correct sector sector = fatClustToSect(CurrentDirStartCluster); sector += slot/DIRENTRIES_PER_SECTOR; // print the entry as a hex table <a class="code" href="debug_8c.html#a0">debugPrintHexTable</a>(32, SectorBuffer+(slot<<5) ); struct FileInfoStruct* fatGetFileInfo(void) return &FileInfo; // return the size of the last directory entry unsigned long fatGetFilesize(void) return FileInfo.Size; // return the long name of the last directory entry char* fatGetFilename(void) return FileNameBuffer; // return the directory of the last directory entry char* fatGetDirname(void) return PathNameBuffer; // load a clusterfull of data void fatLoadCluster(unsigned long cluster, unsigned char *buffer) register unsigned char i; // read cluster //while ( ataReadSectors( DRIVE0, clust2sect(cluster), SectorsPerCluster, buffer) != 0); for(i=0; i<SectorsPerCluster; i++) ataReadSectors( DRIVE0, fatClustToSect(cluster)+i, 1, buffer+(i<<9) ); // temporary fix for wierd misaligned cluster problem // (only when using FAT16?) // ataReadSectors( DRIVE0, fatClustToSect(cluster+8)+i, 1, buffer+(i<<9) ); // find next cluster in the FAT chain unsigned long fatNextCluster(unsigned long cluster) unsigned long nextCluster; unsigned long fatMask; unsigned long fatOffset; unsigned long sector; unsigned int offset; // get fat offset in bytes if(Fat32Enabled) // four FAT bytes (32 bits) for every cluster fatOffset = cluster << 2; // set the FAT bit mask fatMask = FAT32_MASK; else // two FAT bytes (16 bits) for every cluster fatOffset = cluster << 1; // set the FAT bit mask fatMask = FAT16_MASK; // calculate the FAT sector that we're interested in sector = FirstFATSector + (fatOffset / BytesPerSector); // calculate offset of the our entry within that FAT sector offset = fatOffset % BytesPerSector; // if we don't already have this FAT chunk loaded, go get it if (sector != FatInCache) // read sector of FAT table while (ataReadSectors( DRIVE0, sector, 1, (unsigned char*)FAT_CACHE_ADDR) != 0); FatInCache = sector; // read the nextCluster value nextCluster = (*((unsigned long*) &((char*)FAT_CACHE_ADDR)[offset])) & fatMask; // check to see if we're at the end of the chain if (nextCluster == (CLUST_EOFE & fatMask)) nextCluster = 0; #ifdef DEBUG_FAT <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(">"); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(nextCluster); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); #endif return nextCluster; pre></div><hr size="1"><address style="align: right;">Generated on Sun Oct 29 03:41:06 2006 for Procyon AVRlib by  href="http://www.doxygen.org/index.html"> src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </address>

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