2 * FreeRTOS+FAT FS V1.0.0 (C) 2013 HCC Embedded
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4 * The FreeRTOS+FAT SL license terms are different to the FreeRTOS license
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7 * FreeRTOS+FAT SL uses a dual license model that allows the software to be used
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8 * under a pure GPL open source license (as opposed to the modified GPL licence
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9 * under which FreeRTOS is distributed) or a commercial license. Details of
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10 * both license options follow:
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12 * - Open source licensing -
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13 * FreeRTOS+FAT SL is a free download and may be used, modified, evaluated and
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14 * distributed without charge provided the user adheres to version two of the
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15 * GNU General Public License (GPL) and does not remove the copyright notice or
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16 * this text. The GPL V2 text is available on the gnu.org web site, and on the
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17 * following URL: http://www.FreeRTOS.org/gpl-2.0.txt.
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19 * - Commercial licensing -
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20 * Businesses and individuals who for commercial or other reasons cannot comply
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21 * with the terms of the GPL V2 license must obtain a commercial license before
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22 * incorporating FreeRTOS+FAT SL into proprietary software for distribution in
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23 * any form. Commercial licenses can be purchased from
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24 * http://shop.freertos.org/fat_sl and do not require any source files to be
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27 * FreeRTOS+FAT SL is distributed in the hope that it will be useful. You
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28 * cannot use FreeRTOS+FAT SL unless you agree that you use the software 'as
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29 * is'. FreeRTOS+FAT SL is provided WITHOUT ANY WARRANTY; without even the
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30 * implied warranties of NON-INFRINGEMENT, MERCHANTABILITY or FITNESS FOR A
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31 * PARTICULAR PURPOSE. Real Time Engineers Ltd. and HCC Embedded disclaims all
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32 * conditions and terms, be they implied, expressed, or statutory.
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34 * http://www.FreeRTOS.org
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35 * http://www.FreeRTOS.org/FreeRTOS-Plus
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39 #include "../../api/fat_sl.h"
\r
40 #include "../../psp/include/psp_string.h"
\r
49 #include "../../version/ver_fat_sl.h"
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50 #if VER_FAT_SL_MAJOR != 3 || VER_FAT_SL_MINOR != 2
\r
51 #error Incompatible FAT_SL version number!
\r
54 #if F_FS_THREAD_AWARE == 1
\r
58 F_VOLUME gl_volume; /* only one volume */
\r
59 F_FILE gl_file; /* file */
\r
60 char gl_sector[F_SECTOR_SIZE]; /* actual sector */
\r
62 #if F_FILE_CHANGED_EVENT
\r
63 F_FILE_CHANGED_EVENTFUNC f_filechangedevent;
\r
67 /* Defines the number of sectors per cluster on a sector number basis */
\r
70 unsigned long max_sectors;
\r
71 unsigned char sector_per_cluster;
\r
74 static const t_FAT32_CS FAT32_CS[] =
\r
76 { 0x00020000, 1 } /* ->64MB */
\r
77 , { 0x00040000, 2 } /* ->128MB */
\r
78 , { 0x00080000, 4 } /* ->256MB */
\r
79 , { 0x01000000, 8 } /* ->8GB */
\r
80 , { 0x02000000, 16 } /* ->16GB */
\r
81 , { 0x0ffffff0, 32 } /* -> ... */
\r
85 /****************************************************************************
\r
87 * _f_writebootrecord
\r
89 * writing boot record onto a volume, it uses number of hidden sector variable
\r
92 * phy - media physical descriptor
\r
95 * error code or zero if successful
\r
97 ***************************************************************************/
\r
98 static unsigned char _f_writebootrecord ( F_PHY * phy )
\r
100 unsigned char jump_code[] =
\r
104 unsigned char oem_name[] = "MSDOS5.0";
\r
105 unsigned char executable_marker[] =
\r
109 unsigned char * ptr = (unsigned char *)gl_sector;
\r
111 unsigned short mre;
\r
114 unsigned char _n = 0;
\r
116 if ( gl_volume.mediatype == F_FAT32_MEDIA )
\r
117 { /*write FS_INFO*/
\r
123 psp_memset( ptr, 0, F_SECTOR_SIZE );
\r
125 for ( a = 0 ; a < rs ; a++ )
\r
127 ret = _f_writeglsector( a ); /*erase reserved area*/
\r
134 ptr = _setlong( 0x41615252, ptr ); /*signature*/
\r
135 ptr = _setcharzero( 480, ptr ); /*reserved*/
\r
136 ptr = _setlong( 0x61417272, ptr ); /*signature*/
\r
137 ptr = _setlong( 0xffffffff, ptr ); /*no last*/
\r
138 ptr = _setlong( 0xffffffff, ptr ); /*no hint*/
\r
139 ptr = _setcharzero( 12, ptr ); /*reserved*/
\r
140 ptr = _setlong( 0xaa550000, ptr ); /*trail*/
\r
143 ret = _f_writeglsector( 1 ); /*write FSINFO*/
\r
149 ret = _f_writeglsector( 1 + 6 ); /*write FSINFO*/
\r
161 ptr = (unsigned char *)gl_sector;
\r
162 ptr = _setchar( jump_code, sizeof( jump_code ), ptr );
\r
163 ptr = _setchar( oem_name, sizeof( oem_name ) - 1, ptr );
\r
164 ptr = _setword( F_SECTOR_SIZE, ptr );
\r
165 *ptr++ = gl_volume.bootrecord.sector_per_cluster;
\r
166 ptr = _setword( rs, ptr ); /* reserved sectors */
\r
167 *ptr++ = 2; /* number of FATs */
\r
168 ptr = _setword( mre, ptr ); /* max root entry */
\r
169 if ( phy->number_of_sectors < 0x10000 )
\r
171 ptr = _setword( (unsigned short)phy->number_of_sectors, ptr );
\r
175 ptr = _setword( 0, ptr );
\r
178 *ptr++ = 0xf0; /* media descriptor */
\r
179 ptr = _setword( (unsigned short)gl_volume.bootrecord.sector_per_FAT, ptr );
\r
180 ptr = _setword( phy->sector_per_track, ptr );
\r
181 ptr = _setword( phy->number_of_heads, ptr );
\r
182 ptr = _setlong( 0, ptr ); /* number of hidden sectors */
\r
183 if ( phy->number_of_sectors >= 0x10000 )
\r
185 ptr = _setlong( phy->number_of_sectors, ptr );
\r
189 ptr = _setlong( 0, ptr ); /* number of sectors */
\r
192 if ( gl_volume.mediatype == F_FAT32_MEDIA )
\r
194 ptr = _setlong( gl_volume.bootrecord.sector_per_FAT32, ptr );
\r
195 ptr = _setword( 0, ptr );
\r
196 ptr = _setword( 0, ptr );
\r
197 ptr = _setlong( 2, ptr );
\r
198 ptr = _setword( 1, ptr );
\r
199 ptr = _setword( 6, ptr );
\r
200 ptr = _setchar( NULL, 12, ptr );
\r
205 ptr = _setword( 0, ptr ); /* logical drive num */
\r
206 *ptr++ = 0x29; /* extended signature */
\r
207 ptr = _setlong( 0x11223344, ptr );
\r
208 ptr = _setchar( (const unsigned char *)"NO NAME ", 11, ptr ); /* volume name */
\r
210 switch ( gl_volume.mediatype )
\r
212 case F_FAT12_MEDIA:
\r
213 ptr = _setchar( (const unsigned char *)"FAT12 ", 8, ptr );
\r
216 case F_FAT16_MEDIA:
\r
217 ptr = _setchar( (const unsigned char *)"FAT16 ", 8, ptr );
\r
220 case F_FAT32_MEDIA:
\r
221 ptr = _setchar( (const unsigned char *)"FAT32 ", 8, ptr );
\r
225 return F_ERR_INVALIDMEDIA;
\r
228 ptr = _setchar( 0, 448 - _n, ptr );
\r
229 ptr = _setchar( executable_marker, sizeof( executable_marker ), ptr );
\r
233 ret = _f_writeglsector( 6 );
\r
241 return _f_writeglsector( 0 ); /*write bootrecord*/
\r
242 } /* _f_writebootrecord */
\r
245 /****************************************************************************
\r
250 * phy - media physical descriptor
\r
252 * calculate relative sector position from boot record
\r
254 ***************************************************************************/
\r
255 static unsigned char _f_buildsectors ( F_PHY * phy )
\r
257 gl_volume.mediatype = F_UNKNOWN_MEDIA;
\r
260 if ( gl_volume.bootrecord.sector_per_FAT )
\r
262 gl_volume.firstfat.sector = 1;
\r
263 gl_volume.firstfat.num = gl_volume.bootrecord.sector_per_FAT;
\r
264 gl_volume.root.sector = gl_volume.firstfat.sector + ( gl_volume.firstfat.num * (unsigned long)( gl_volume.bootrecord.number_of_FATs ) );
\r
265 gl_volume.root.num = ( 512 * sizeof( F_DIRENTRY ) ) / F_SECTOR_SIZE;
\r
267 gl_volume._tdata.sector = gl_volume.root.sector + gl_volume.root.num;
\r
268 gl_volume._tdata.num = 0; /*??*/
\r
272 gl_volume.firstfat.sector = ( 32 + 4 );
\r
273 gl_volume.firstfat.num = gl_volume.bootrecord.sector_per_FAT32;
\r
274 gl_volume._tdata.sector = gl_volume.firstfat.sector;
\r
275 gl_volume._tdata.sector += gl_volume.firstfat.num * (unsigned long)( gl_volume.bootrecord.number_of_FATs );
\r
276 gl_volume._tdata.num = 0; /*??*/
\r
279 unsigned long sectorcou = gl_volume.bootrecord.sector_per_cluster;
\r
280 gl_volume.root.sector = ( ( gl_volume.bootrecord.rootcluster - 2 ) * sectorcou ) + gl_volume._tdata.sector;
\r
281 gl_volume.root.num = gl_volume.bootrecord.sector_per_cluster;
\r
286 unsigned long maxcluster;
\r
287 maxcluster = phy->number_of_sectors;
\r
288 maxcluster -= gl_volume._tdata.sector;
\r
289 maxcluster /= gl_volume.bootrecord.sector_per_cluster;
\r
290 gl_volume.maxcluster = maxcluster;
\r
293 if ( gl_volume.maxcluster < ( F_CLUSTER_RESERVED & 0xfff ) )
\r
295 gl_volume.mediatype = F_FAT12_MEDIA;
\r
297 else if ( gl_volume.maxcluster < ( F_CLUSTER_RESERVED & 0xffff ) )
\r
299 gl_volume.mediatype = F_FAT16_MEDIA;
\r
303 gl_volume.mediatype = F_FAT32_MEDIA;
\r
307 } /* _f_buildsectors */
\r
311 /****************************************************************************
\r
315 * preparing boot record for formatting, it sets and calculates values
\r
318 * phy - media physical descriptor
\r
319 * f_bootrecord - which bootrecord need to be prepare
\r
320 * number_of_hidden_sectors - where boot record starts
\r
321 * fattype - one of this definitions F_FAT12_MEDIA,F_FAT16_MEDIA,F_FAT32_MEDIA
\r
324 * error code or zero if successful
\r
326 ***************************************************************************/
\r
327 static unsigned char _f_prepareformat ( F_PHY * phy, unsigned char fattype )
\r
329 if ( !phy->number_of_sectors )
\r
331 return F_ERR_INVALIDSECTOR;
\r
334 gl_volume.bootrecord.number_of_FATs = 2;
\r
335 gl_volume.bootrecord.media_descriptor = 0xf0;
\r
337 if ( fattype != F_FAT32_MEDIA )
\r
342 case F_FAT12_MEDIA:
\r
343 _n = F_CLUSTER_RESERVED & 0xfff;
\r
346 case F_FAT16_MEDIA:
\r
347 _n = F_CLUSTER_RESERVED & 0xffff;
\r
351 return F_ERR_INVFATTYPE;
\r
354 gl_volume.bootrecord.sector_per_cluster = 1;
\r
355 while ( gl_volume.bootrecord.sector_per_cluster )
\r
357 if ( phy->number_of_sectors / gl_volume.bootrecord.sector_per_cluster < _n )
\r
362 gl_volume.bootrecord.sector_per_cluster <<= 1;
\r
365 if ( !gl_volume.bootrecord.sector_per_cluster )
\r
367 return F_ERR_MEDIATOOLARGE;
\r
374 for ( i = 0 ; i<( sizeof( FAT32_CS ) / sizeof( t_FAT32_CS ) ) - 1 && phy->number_of_sectors>FAT32_CS[i].max_sectors ; i++ )
\r
378 gl_volume.bootrecord.sector_per_cluster = FAT32_CS[i].sector_per_cluster;
\r
380 if ( !gl_volume.bootrecord.sector_per_cluster )
\r
382 return F_ERR_INVALIDMEDIA; /*fat16 cannot be there*/
\r
386 long secpercl = gl_volume.bootrecord.sector_per_cluster;
\r
387 long nfat = gl_volume.bootrecord.number_of_FATs;
\r
388 unsigned long roots;
\r
389 unsigned long fatsec;
\r
391 roots = ( 512 * sizeof( F_DIRENTRY ) ) / F_SECTOR_SIZE;
\r
395 case F_FAT32_MEDIA:
\r
397 unsigned long _n = (unsigned long)( 128 * secpercl + nfat );
\r
398 fatsec = ( phy->number_of_sectors - ( 32 + 4 ) + 2 * secpercl );
\r
399 fatsec += ( _n - 1 );
\r
401 gl_volume.bootrecord.sector_per_FAT32 = fatsec;
\r
402 gl_volume.bootrecord.sector_per_FAT = 0;
\r
406 case F_FAT16_MEDIA:
\r
408 unsigned long _n = (unsigned long)( 256 * secpercl + nfat );
\r
409 fatsec = ( phy->number_of_sectors - 1 - roots + 2 * secpercl );
\r
410 fatsec += ( _n - 1 );
\r
412 gl_volume.bootrecord.sector_per_FAT = (unsigned short)( fatsec );
\r
416 case F_FAT12_MEDIA:
\r
418 unsigned long _n = (unsigned long)( 1024 * secpercl + 3 * nfat );
\r
419 fatsec = ( phy->number_of_sectors - 1 - roots + 2 * secpercl );
\r
421 fatsec += ( _n - 1 );
\r
423 gl_volume.bootrecord.sector_per_FAT = (unsigned short)( fatsec );
\r
428 return F_ERR_INVALIDMEDIA;
\r
433 } /* _f_prepareformat */
\r
437 /****************************************************************************
\r
441 * erase fats, erase root directory, reset variables after formatting
\r
444 * phy - media physical descriptor
\r
445 * fattype - one of this definitions F_FAT12_MEDIA,F_FAT16_MEDIA,F_FAT32_MEDIA
\r
448 * error code or zero if successful
\r
450 ***************************************************************************/
\r
451 static unsigned char _f_postformat ( F_PHY * phy, unsigned char fattype )
\r
456 _f_buildsectors( phy ); /*get positions*/
\r
457 if ( gl_volume.mediatype != fattype )
\r
459 return F_ERR_MEDIATOOSMALL;
\r
462 gl_volume.fatsector = (unsigned long)( -1 );
\r
465 unsigned char * ptr = (unsigned char *)gl_sector;
\r
466 unsigned char j = 2;
\r
469 psp_memset( ptr, 0, F_SECTOR_SIZE );
\r
471 switch ( gl_volume.mediatype )
\r
473 case F_FAT16_MEDIA:
\r
477 case F_FAT32_MEDIA:
\r
482 *ptr = gl_volume.bootrecord.media_descriptor;
\r
483 psp_memset( ptr + 1, 0xff, j );
\r
484 if ( gl_volume.mediatype == F_FAT32_MEDIA )
\r
486 *( ptr + 8 ) = (unsigned char)( F_CLUSTER_LAST & 0xff );
\r
489 (void)_f_writeglsector( gl_volume.firstfat.sector );
\r
490 (void)_f_writeglsector( gl_volume.firstfat.sector + gl_volume.firstfat.num );
\r
491 psp_memset( ptr, 0, ( j + 1 ) );
\r
493 for ( i = 1 ; i < gl_volume.firstfat.num ; i++ )
\r
495 (void)_f_writeglsector( gl_volume.firstfat.sector + i );
\r
496 (void)_f_writeglsector( gl_volume.firstfat.sector + i + gl_volume.firstfat.num );
\r
500 for ( a = 0 ; a < gl_volume.root.num ; a++ ) /*reset root direntries*/
\r
502 ret = _f_writeglsector( gl_volume.root.sector + a );
\r
509 return _f_writebootrecord( phy );
\r
510 } /* _f_postformat */
\r
513 /****************************************************************************
\r
517 * Making a complete format on media, independently from master boot record,
\r
518 * according to media physical
\r
521 * fattype - one of this definitions F_FAT12_MEDIA,F_FAT16_MEDIA,F_FAT32_MEDIA
\r
524 * error code or zero if successful
\r
526 ***************************************************************************/
\r
527 unsigned char fn_hardformat ( unsigned char fattype )
\r
533 ret = _f_getvolume();
\r
534 if ( ret && ( ret != F_ERR_NOTFORMATTED ) )
\r
539 gl_volume.state = F_STATE_NEEDMOUNT;
\r
541 psp_memset( &phy, 0, sizeof( F_PHY ) );
\r
543 mdrv_ret = mdrv->getphy( mdrv, &phy );
\r
546 return F_ERR_ONDRIVE;
\r
549 ret = _f_prepareformat( &phy, fattype ); /*no partition*/
\r
555 return _f_postformat( &phy, fattype );
\r
556 } /* fn_hardformat */
\r
561 /****************************************************************************
\r
563 * _f_readbootrecord
\r
565 * read boot record from a volume, it detects if there is MBR on the media
\r
569 * error code or zero if successful
\r
571 ***************************************************************************/
\r
572 static unsigned char _f_readbootrecord ( void )
\r
575 unsigned char * ptr = (unsigned char *)gl_sector;
\r
576 unsigned long maxcluster, _n;
\r
577 unsigned long first_sector = 0;
\r
579 gl_volume.mediatype = F_UNKNOWN_MEDIA;
\r
582 ret = _f_readglsector( 0 );
\r
589 if ( ( ptr[0x1fe] != 0x55 ) || ( ptr[0x1ff] != 0xaa ) )
\r
591 return F_ERR_NOTFORMATTED; /*??*/
\r
594 if ( ( ptr[0] != 0xeb ) && ( ptr[0] != 0xe9 ) )
\r
596 first_sector = _f_getlong( &ptr[0x08 + 0x1be] ); /*start sector for 1st partioon*/
\r
598 ret = _f_readglsector( first_sector );
\r
604 if ( ( ptr[0x1fe] != 0x55 ) || ( ptr[0x1ff] != 0xaa ) )
\r
606 return F_ERR_NOTFORMATTED; /*??*/
\r
609 if ( ( ptr[0] != 0xeb ) && ( ptr[0] != 0xe9 ) )
\r
611 return F_ERR_NOTFORMATTED; /*??*/
\r
616 if ( _f_getword( ptr ) != F_SECTOR_SIZE )
\r
618 return F_ERR_NOTSUPPSECTORSIZE;
\r
622 gl_volume.bootrecord.sector_per_cluster = *ptr++;
\r
623 gl_volume.firstfat.sector = _f_getword( ptr );
\r
625 gl_volume.bootrecord.number_of_FATs = *ptr++;
\r
626 gl_volume.root.num = _f_getword( ptr );
\r
628 gl_volume.root.num *= sizeof( F_DIRENTRY );
\r
629 gl_volume.root.num /= F_SECTOR_SIZE;
\r
630 maxcluster = _f_getword( ptr );
\r
632 gl_volume.bootrecord.media_descriptor = *ptr++;
\r
633 gl_volume.firstfat.num = _f_getword( ptr );
\r
635 _n = _f_getlong( ptr );
\r
637 if ( _n < first_sector )
\r
642 gl_volume.firstfat.sector += _n;
\r
645 maxcluster = _f_getlong( ptr );
\r
651 if ( gl_volume.firstfat.num )
\r
653 gl_volume.root.sector = gl_volume.firstfat.sector + ( gl_volume.firstfat.num * gl_volume.bootrecord.number_of_FATs );
\r
654 gl_volume._tdata.sector = gl_volume.root.sector + gl_volume.root.num;
\r
655 gl_volume._tdata.num = 0;
\r
660 gl_volume.firstfat.num = _f_getlong( ptr );
\r
662 gl_volume._tdata.sector = gl_volume.firstfat.sector;
\r
663 gl_volume._tdata.sector += gl_volume.firstfat.num * gl_volume.bootrecord.number_of_FATs;
\r
664 gl_volume._tdata.num = 0;
\r
665 gl_volume.bootrecord.rootcluster = _f_getlong( ptr );
\r
667 gl_volume.root.num = gl_volume.bootrecord.sector_per_cluster;
\r
668 gl_volume.root.sector = ( ( gl_volume.bootrecord.rootcluster - 2 ) * gl_volume.root.num ) + gl_volume._tdata.sector;
\r
671 gl_volume.bootrecord.serial_number = _f_getlong( ptr );
\r
673 maxcluster -= gl_volume._tdata.sector;
\r
675 gl_volume.maxcluster = maxcluster / gl_volume.bootrecord.sector_per_cluster;
\r
677 if ( gl_volume.maxcluster < ( F_CLUSTER_RESERVED & 0xfff ) )
\r
679 gl_volume.mediatype = F_FAT12_MEDIA;
\r
681 else if ( gl_volume.maxcluster < ( F_CLUSTER_RESERVED & 0xffff ) )
\r
683 gl_volume.mediatype = F_FAT16_MEDIA;
\r
687 gl_volume.mediatype = F_FAT32_MEDIA;
\r
690 if ( gl_volume.bootrecord.media_descriptor != 0xf8 ) /*fixdrive*/
\r
692 if ( gl_volume.bootrecord.media_descriptor != 0xf0 ) /*removable*/
\r
694 return F_ERR_NOTFORMATTED; /*??*/
\r
699 } /* _f_readbootrecord */
\r
704 /****************************************************************************
\r
708 * getting back a volume info structure of a given drive, it try to mounts
\r
709 * drive if it was not mounted before
\r
713 * error code or zero if successful
\r
715 ***************************************************************************/
\r
716 unsigned char _f_getvolume ( void )
\r
718 switch ( gl_volume.state )
\r
721 return F_ERR_ONDRIVE;
\r
723 case F_STATE_WORKING:
\r
725 if ( !_f_checkstatus() )
\r
730 /* here we don't stop case flow, */
\r
731 /* because we have to clean up this volume! */
\r
733 case F_STATE_NEEDMOUNT:
\r
735 gl_file.modified = 0;
\r
736 gl_volume.modified = 0;
\r
737 gl_volume.lastalloccluster = 0;
\r
738 gl_volume.actsector = (unsigned long)( -1 );
\r
739 gl_volume.fatsector = (unsigned long)( -1 );
\r
741 gl_file.mode = F_FILE_CLOSE;
\r
743 gl_volume.cwd[0] = 0; /*reset cwd*/
\r
744 gl_volume.mediatype = F_UNKNOWN_MEDIA;
\r
746 if ( mdrv->getstatus != NULL )
\r
748 if ( mdrv->getstatus( mdrv ) & F_ST_MISSING )
\r
750 gl_volume.state = F_STATE_NEEDMOUNT; /*card missing*/
\r
751 return F_ERR_CARDREMOVED;
\r
755 if ( !_f_readbootrecord() )
\r
757 gl_volume.state = F_STATE_WORKING;
\r
761 gl_volume.mediatype = F_UNKNOWN_MEDIA;
\r
762 return F_ERR_NOTFORMATTED;
\r
766 return F_ERR_ONDRIVE;
\r
767 } /* _f_getvolume */
\r
771 /****************************************************************************
\r
775 * get total/free/used/bad diskspace
\r
778 * pspace - pointer where to store the information
\r
783 ***************************************************************************/
\r
784 unsigned char fn_getfreespace ( F_SPACE * pspace )
\r
788 unsigned long clustersize;
\r
790 ret = _f_getvolume();
\r
796 psp_memset( pspace, 0, sizeof( F_SPACE ) );
\r
797 pspace->total = gl_volume.maxcluster;
\r
799 gl_volume.fatsector = (unsigned long)-1;
\r
800 for ( a = 2 ; a < gl_volume.maxcluster + 2 ; a++ )
\r
802 unsigned long value;
\r
804 ret = _f_getclustervalue( a, &value );
\r
812 ++( pspace->free );
\r
814 else if ( value == F_CLUSTER_BAD )
\r
820 ++( pspace->used );
\r
824 clustersize = (unsigned long)( gl_volume.bootrecord.sector_per_cluster * F_SECTOR_SIZE );
\r
825 for ( a = 0 ; ( clustersize & 1 ) == 0 ; a++ )
\r
830 pspace->total_high = ( pspace->total ) >> ( 32 - a );
\r
831 pspace->total <<= a;
\r
832 pspace->free_high = ( pspace->free ) >> ( 32 - a );
\r
833 pspace->free <<= a;
\r
834 pspace->used_high = ( pspace->used ) >> ( 32 - a );
\r
835 pspace->used <<= a;
\r
836 pspace->bad_high = ( pspace->bad ) >> ( 32 - a );
\r
840 } /* fn_getfreespace */
\r
843 /****************************************************************************
\r
847 * get serial number
\r
850 * serial - pointer where to store the serial number
\r
855 ***************************************************************************/
\r
856 unsigned char fn_getserial ( unsigned long * serial )
\r
860 ret = _f_getvolume();
\r
866 *serial = gl_volume.bootrecord.serial_number;
\r
873 ** Initialize FAT_SL file system
\r
875 ** RETURN: F_NO_ERROR on success, other if error.
\r
877 unsigned char fn_init ( void )
\r
882 /****************************************************************************
\r
886 * initiate a volume, this function has to be called 1st to set physical
\r
887 * driver function to a given volume
\r
891 * error code or zero if successful
\r
893 ***************************************************************************/
\r
894 unsigned char fn_initvolume ( F_DRIVERINIT initfunc )
\r
896 #if F_FS_THREAD_AWARE == 1
\r
898 if( fs_lock_semaphore == NULL )
\r
900 fs_lock_semaphore = xSemaphoreCreateMutex();
\r
901 if( fs_lock_semaphore == NULL )
\r
907 #endif /* F_FS_THREAD_AWARE */
\r
909 gl_volume.state = F_STATE_NONE;
\r
911 mdrv = initfunc( 0 );
\r
912 if ( mdrv == NULL )
\r
914 return F_ERR_INITFUNC;
\r
917 gl_volume.state = F_STATE_NEEDMOUNT;
\r
919 #if F_FILE_CHANGED_EVENT
\r
920 f_filechangedevent = 0;
\r
923 return _f_getvolume();
\r
924 } /* fn_initvolume */
\r
926 /****************************************************************************
\r
930 ***************************************************************************/
\r
931 unsigned char fn_delvolume ( void )
\r
933 if ( mdrv->release )
\r
935 (void)mdrv->release( mdrv );
\r