forked from FreeRTOS/Lab-Project-FreeRTOS-FAT
-
Notifications
You must be signed in to change notification settings - Fork 0
/
ff_ioman.c
1986 lines (1697 loc) · 69.2 KB
/
ff_ioman.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* FreeRTOS+FAT V2.3.3
* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* https://www.FreeRTOS.org
* https://github.com/FreeRTOS
*
*/
/**
* @file ff_ioman.c
* @ingroup IOMAN
*
* @defgroup IOMAN I/O Manager
* @brief Handles IO buffers for FreeRTOS+FAT safely.
*
* Provides a simple static interface to the rest of FreeRTOS+FAT to manage
* buffers. It also defines the public interfaces for Creating and
* Destroying a FreeRTOS+FAT IO object.
**/
#include <time.h>
#include <string.h>
#include "ff_headers.h"
#define FAT16_SECTOR_COUNT_4085 4085
#define FAT32_SECTOR_COUNT_65525 65525 /* 65536 clusters */
/* Some values and offsets describing the special sector FS INFO: */
#define FS_INFO_SIGNATURE1_0x41615252 0x41615252UL
#define FS_INFO_SIGNATURE2_0x61417272 0x61417272UL
#define FS_INFO_OFFSET_SIGNATURE1_000 0
#define FS_INFO_OFFSET_SIGNATURE2_484 484
#define FS_INFO_OFFSET_FREE_COUNT_488 488
#define FS_INFO_OFFSET_FREE_CLUSTER_492 492
/* Inspect the PBR (Partition Boot Record) to determine the type of FAT */
static FF_Error_t prvDetermineFatType( FF_IOManager_t * pxIOManager );
/* Check if a given ID introduces an extended partition. */
static BaseType_t prvIsExtendedPartition( uint8_t ucPartitionID );
/* Return pdTRUE if the media byte in an MBR is valid. */
static BaseType_t prvIsValidMedia( uint8_t media );
/* Read the MBR to see what extended partitions have been defined.
* Definitions of extended partitions may be chained.
* Walk down the chain to find all extended partitions. */
static FF_Error_t FF_ParseExtended( FF_IOManager_t * pxIOManager,
uint32_t ulFirstSector,
uint32_t ulFirstSize,
FF_SPartFound_t * pPartsFound );
static FF_Error_t FF_GetEfiPartitionEntry( FF_IOManager_t * pxIOManager,
uint32_t ulPartitionNumber );
static BaseType_t prvHasActiveHandles( FF_IOManager_t * pxIOManager );
/**
* @brief Creates an FF_IOManager_t object, to initialise FreeRTOS+FAT
*
* @param pxParameters The Creation parameters to create the IO manager with
* @param pError Pointer to a signed byte for error checking. Can be NULL if not required.
* To be checked when a NULL pointer is returned.
*
* @return Returns a pointer to an FF_IOManager_t type object. NULL on xError, check the contents of
* pError
**/
FF_IOManager_t * FF_CreateIOManager( FF_CreationParameters_t * pxParameters,
FF_Error_t * pError )
{
FF_IOManager_t * pxIOManager = NULL;
FF_Error_t xError;
uint32_t ulCacheSize = pxParameters->ulMemorySize;
uint32_t usSectorSize = ( uint32_t ) pxParameters->ulSectorSize;
/* Normally:
* ulSectorSize = 512
* ulCacheSize = N x ulSectorSize. */
if( ( ( usSectorSize % 512 ) != 0 ) || ( usSectorSize == 0 ) )
{
/* ulSectorSize Size not a multiple of 512 or it is zero*/
xError = FF_createERR( FF_ERR_IOMAN_BAD_BLKSIZE, FF_CREATEIOMAN );
}
else if( ( ( ulCacheSize % ( uint32_t ) usSectorSize ) != 0 ) || ( ulCacheSize == 0 ) ||
( ulCacheSize == ( uint32_t ) usSectorSize ) )
{
/* The size of the caching memory (ulCacheSize) must now be atleast 2 * ulSectorSize (or a deadlock will occur). */
xError = FF_createERR( FF_ERR_IOMAN_BAD_MEMSIZE, FF_CREATEIOMAN );
}
else
{
pxIOManager = ( FF_IOManager_t * ) ffconfigMALLOC( sizeof( FF_IOManager_t ) );
/* Ensure malloc() succeeded. */
if( pxIOManager != NULL )
{
/* Use memset() to clear every single bit. */
memset( pxIOManager, '\0', sizeof( FF_IOManager_t ) );
if( FF_CreateEvents( pxIOManager ) != pdFALSE )
{
xError = FF_ERR_NONE;
}
else
{
/* xEventGroupCreate() probably failed. */
xError = FF_createERR( FF_ERR_NOT_ENOUGH_MEMORY, FF_CREATEIOMAN );
}
}
else
{
/* ffconfigMALLOC() failed. */
xError = FF_createERR( FF_ERR_NOT_ENOUGH_MEMORY, FF_CREATEIOMAN );
}
}
if( FF_isERR( xError ) == pdFALSE )
{
/* pxIOManager is created, FF_CreateEvents() succeeded. */
if( pxParameters->pucCacheMemory != NULL )
{
/* The caller has provided a piece of memory, use it. */
pxIOManager->pucCacheMem = pxParameters->pucCacheMemory;
}
else
{
/* No cache buffer provided, call malloc(). */
pxIOManager->pucCacheMem = ( uint8_t * ) ffconfigMALLOC( ulCacheSize );
if( pxIOManager->pucCacheMem != NULL )
{
/* Indicate that malloc() was used for pucCacheMem. */
pxIOManager->ucFlags |= FF_IOMAN_ALLOC_BUFFERS;
}
else
{
xError = FF_createERR( FF_ERR_NOT_ENOUGH_MEMORY, FF_CREATEIOMAN );
}
}
if( pxIOManager->pucCacheMem != NULL )
{
memset( pxIOManager->pucCacheMem, '\0', ulCacheSize );
}
}
if( FF_isERR( xError ) == pdFALSE )
{
pxIOManager->usSectorSize = ( uint16_t ) usSectorSize;
pxIOManager->usCacheSize = ( uint16_t ) ( ulCacheSize / ( uint32_t ) usSectorSize );
/* Malloc() memory for buffer objects. FreeRTOS+FAT never refers to a
* buffer directly but uses buffer objects instead. Allows for thread
* safety. */
pxIOManager->pxBuffers = ( FF_Buffer_t * ) ffconfigMALLOC( sizeof( FF_Buffer_t ) * pxIOManager->usCacheSize );
if( pxIOManager->pxBuffers != NULL )
{
/* From now on a call to FF_IOMAN_InitBufferDescriptors will clear
* pxBuffers. */
pxIOManager->ucFlags |= FF_IOMAN_ALLOC_BUFDESCR;
FF_IOMAN_InitBufferDescriptors( pxIOManager );
/* Finally store the semaphore for Buffer Description modifications. */
pxIOManager->pvSemaphore = pxParameters->pvSemaphore;
#if ( ffconfigPROTECT_FF_FOPEN_WITH_SEMAPHORE == 1 )
pxIOManager->pvSemaphoreOpen = xSemaphoreCreateRecursiveMutex();
if( pxIOManager->pvSemaphoreOpen == NULL )
{
/* Tell the user that there was not enough mmory. */
xError = FF_createERR( FF_ERR_NOT_ENOUGH_MEMORY, FF_CREATEIOMAN );
}
else
#endif /* ffconfigPROTECT_FF_FOPEN_WITH_SEMAPHORE */
{
if( pxParameters->xBlockDeviceIsReentrant != pdFALSE )
{
pxIOManager->ucFlags |= FF_IOMAN_BLOCK_DEVICE_IS_REENTRANT;
}
pxIOManager->xBlkDevice.fnpReadBlocks = pxParameters->fnReadBlocks;
pxIOManager->xBlkDevice.fnpWriteBlocks = pxParameters->fnWriteBlocks;
pxIOManager->xBlkDevice.pxDisk = pxParameters->pxDisk;
}
}
else
{
xError = FF_createERR( FF_ERR_NOT_ENOUGH_MEMORY, FF_CREATEIOMAN );
}
}
if( FF_isERR( xError ) )
{
if( pxIOManager != NULL )
{
FF_DeleteIOManager( pxIOManager );
pxIOManager = NULL;
}
}
if( pError != NULL )
{
*pError = xError;
}
return pxIOManager;
} /* FF_CreateIOManager() */
/*-----------------------------------------------------------*/
/**
* @brief Destroys an FF_IOManager_t object, and frees all assigned memory.
*
* @param pxIOManager Pointer to an FF_IOManager_t object, as returned from FF_CreateIOManager.
*
* @return FF_ERR_NONE on sucess, or a documented error code on failure. (FF_ERR_NULL_POINTER)
*
**/
FF_Error_t FF_DeleteIOManager( FF_IOManager_t * pxIOManager )
{
FF_Error_t xError;
/* Ensure no NULL pointer was provided. */
if( pxIOManager == NULL )
{
xError = FF_createERR( FF_ERR_NULL_POINTER, FF_DESTROYIOMAN );
}
else
{
xError = FF_ERR_NONE;
/* Ensure pxBuffers pointer was allocated. */
if( ( pxIOManager->ucFlags & FF_IOMAN_ALLOC_BUFDESCR ) != 0 )
{
ffconfigFREE( pxIOManager->pxBuffers );
}
/* Ensure pucCacheMem pointer was allocated. */
if( ( pxIOManager->ucFlags & FF_IOMAN_ALLOC_BUFFERS ) != 0 )
{
ffconfigFREE( pxIOManager->pucCacheMem );
}
#if ( ffconfigPROTECT_FF_FOPEN_WITH_SEMAPHORE == 1 )
{
if( pxIOManager->pvSemaphoreOpen != NULL )
{
vSemaphoreDelete( pxIOManager->pvSemaphoreOpen );
}
}
#endif
/* Delete the event group object within the IO manager before deleting
* the manager. */
FF_DeleteEvents( pxIOManager );
/* Finally free the FF_IOManager_t object. */
ffconfigFREE( pxIOManager );
}
return xError;
} /* FF_DeleteIOManager() */
/*-----------------------------------------------------------*/
/**
* @brief Initialises Buffer Descriptions as part of the FF_IOManager_t object initialisation.
*
* @param pxIOManager IOMAN Object.
*
**/
void FF_IOMAN_InitBufferDescriptors( FF_IOManager_t * pxIOManager )
{
uint8_t * pucBuffer = pxIOManager->pucCacheMem;
FF_Buffer_t * pxBuffer = pxIOManager->pxBuffers;
FF_Buffer_t * pxLastBuffer = pxBuffer + pxIOManager->usCacheSize;
/* Clear the contents of the buffer descriptors. */
memset( ( void * ) pxBuffer, '\0', sizeof( FF_Buffer_t ) * pxIOManager->usCacheSize );
while( pxBuffer < pxLastBuffer )
{
pxBuffer->pucBuffer = pucBuffer;
pxBuffer++;
pucBuffer += pxIOManager->usSectorSize;
}
} /* FF_IOMAN_InitBufferDescriptors() */
/*-----------------------------------------------------------*/
/**
* @brief Flushes all Write cache buffers with no active Handles.
*
* @param pxIOManager IOMAN Object.
*
* @return FF_ERR_NONE on Success.
**/
FF_Error_t FF_FlushCache( FF_IOManager_t * pxIOManager )
{
BaseType_t xIndex, xIndex2;
FF_Error_t xError;
if( pxIOManager == NULL )
{
xError = FF_createERR( FF_ERR_NULL_POINTER, FF_FLUSHCACHE );
}
else
{
xError = FF_ERR_NONE;
FF_PendSemaphore( pxIOManager->pvSemaphore );
{
for( xIndex = 0; xIndex < pxIOManager->usCacheSize; xIndex++ )
{
/* If a buffers has no users and if it has been modified... */
if( ( pxIOManager->pxBuffers[ xIndex ].usNumHandles == 0 ) && ( pxIOManager->pxBuffers[ xIndex ].bModified == pdTRUE ) )
{
/* The buffer may be flushed to disk. */
FF_BlockWrite( pxIOManager, pxIOManager->pxBuffers[ xIndex ].ulSector, 1, pxIOManager->pxBuffers[ xIndex ].pucBuffer, pdTRUE );
/* Buffer has now been flushed, mark it as a read buffer and unmodified. */
pxIOManager->pxBuffers[ xIndex ].ucMode = FF_MODE_READ;
pxIOManager->pxBuffers[ xIndex ].bModified = pdFALSE;
/* Search for other buffers that used this sector, and mark them as modified
* So that further requests will result in the new sector being fetched. */
for( xIndex2 = 0; xIndex2 < pxIOManager->usCacheSize; xIndex2++ )
{
if( ( xIndex != xIndex2 ) &&
( pxIOManager->pxBuffers[ xIndex2 ].ulSector == pxIOManager->pxBuffers[ xIndex ].ulSector ) &&
( pxIOManager->pxBuffers[ xIndex2 ].ucMode == FF_MODE_READ ) )
{
pxIOManager->pxBuffers[ xIndex2 ].bModified = pdTRUE;
}
}
}
}
}
if( ( pxIOManager->xBlkDevice.pxDisk != NULL ) &&
( pxIOManager->xBlkDevice.pxDisk->fnFlushApplicationHook != NULL ) )
{
/* Let the low-level driver also flush data.
* See comments in ff_ioman.h. */
pxIOManager->xBlkDevice.pxDisk->fnFlushApplicationHook( pxIOManager->xBlkDevice.pxDisk );
}
FF_ReleaseSemaphore( pxIOManager->pvSemaphore );
}
return xError;
} /* FF_FlushCache() */
/*-----------------------------------------------------------*/
/*
* A new version of FF_GetBuffer() with a simple mechanism for timeout
*/
#define FF_GETBUFFER_SLEEP_TIME_MS 10
#define FF_GETBUFFER_WAIT_TIME_MS ( 20000 / FF_GETBUFFER_SLEEP_TIME_MS )
FF_Buffer_t * FF_GetBuffer( FF_IOManager_t * pxIOManager,
uint32_t ulSector,
uint8_t ucMode )
{
FF_Buffer_t * pxBuffer;
/* Least Recently Used Buffer */
FF_Buffer_t * pxRLUBuffer;
FF_Buffer_t * pxMatchingBuffer = NULL;
int32_t lRetVal;
BaseType_t xLoopCount = FF_GETBUFFER_WAIT_TIME_MS;
const FF_Buffer_t * pxLastBuffer = &( pxIOManager->pxBuffers[ pxIOManager->usCacheSize ] );
/* 'pxIOManager->usCacheSize' is bigger than zero and it is a multiple of ulSectorSize. */
while( pxMatchingBuffer == NULL )
{
xLoopCount--;
if( xLoopCount == 0 )
{
break;
}
FF_PendSemaphore( pxIOManager->pvSemaphore );
for( pxBuffer = pxIOManager->pxBuffers; pxBuffer < pxLastBuffer; pxBuffer++ )
{
if( ( pxBuffer->ulSector == ulSector ) && ( pxBuffer->bValid ) )
{
pxMatchingBuffer = pxBuffer;
/* Don't look further if you found a perfect match. */
break;
}
}
if( pxMatchingBuffer != NULL )
{
/* A Match was found process! */
if( ( ucMode == FF_MODE_READ ) && ( pxMatchingBuffer->ucMode == FF_MODE_READ ) )
{
pxMatchingBuffer->usNumHandles += 1;
pxMatchingBuffer->usPersistance += 1;
break;
}
if( pxMatchingBuffer->usNumHandles == 0 )
{
/* Copy the read & write flags. */
pxMatchingBuffer->ucMode = ( ucMode & FF_MODE_RD_WR );
if( ( ucMode & FF_MODE_WRITE ) != 0 )
{
/* This buffer has no attached handles. */
pxMatchingBuffer->bModified = pdTRUE;
}
pxMatchingBuffer->usNumHandles = 1;
pxMatchingBuffer->usPersistance += 1;
break;
}
/* Sector is already in use in a different mode, keep yielding until its available! */
pxMatchingBuffer = NULL;
}
else
{
/* There is no valid buffer now for the desired sector.
* Find a free buffer and use it for that sector. */
pxRLUBuffer = NULL;
for( pxBuffer = pxIOManager->pxBuffers; pxBuffer < pxLastBuffer; pxBuffer++ )
{
if( pxBuffer->usNumHandles != 0 )
{
continue; /* Occupied */
}
pxBuffer->ulLRU += 1;
if( ( pxRLUBuffer == NULL ) ||
( pxBuffer->ulLRU > pxRLUBuffer->ulLRU ) ||
( ( pxBuffer->ulLRU == pxRLUBuffer->ulLRU ) && ( pxBuffer->usPersistance > pxRLUBuffer->usPersistance ) ) )
{
pxRLUBuffer = pxBuffer;
}
}
/* A free buffer with the highest value of 'ulLRU' was found: */
if( pxRLUBuffer != NULL )
{
/* Process the suitable candidate. */
if( pxRLUBuffer->bModified == pdTRUE )
{
/* Along with the pdTRUE parameter to indicate semaphore has been claimed already. */
lRetVal = FF_BlockWrite( pxIOManager, pxRLUBuffer->ulSector, 1, pxRLUBuffer->pucBuffer, pdTRUE );
if( lRetVal < 0 )
{
/* NULL will be returned because 'pxMatchingBuffer' is still NULL. */
break;
}
}
if( ucMode == FF_MODE_WR_ONLY )
{
memset( pxRLUBuffer->pucBuffer, '\0', pxIOManager->usSectorSize );
}
else
{
lRetVal = FF_BlockRead( pxIOManager, ulSector, 1, pxRLUBuffer->pucBuffer, pdTRUE );
if( lRetVal < 0 )
{
/* 'pxMatchingBuffer' is NULL. */
break;
}
}
pxRLUBuffer->ucMode = ( ucMode & FF_MODE_RD_WR );
pxRLUBuffer->usPersistance = 1;
pxRLUBuffer->ulLRU = 0;
pxRLUBuffer->usNumHandles = 1;
pxRLUBuffer->ulSector = ulSector;
pxRLUBuffer->bModified = ( ucMode & FF_MODE_WRITE ) != 0;
pxRLUBuffer->bValid = pdTRUE;
pxMatchingBuffer = pxRLUBuffer;
break;
} /* if( pxRLUBuffer != NULL ) */
} /* else ( pxMatchingBuffer == NULL ) */
FF_ReleaseSemaphore( pxIOManager->pvSemaphore );
/* Better to go asleep to give low-priority task a chance to release buffer(s). */
FF_BufferWait( pxIOManager, FF_GETBUFFER_SLEEP_TIME_MS );
} /* while( pxMatchingBuffer == NULL ) */
if( xLoopCount > 0 )
{
/* If xLoopCount is 0 here, the semaphore was not taken. */
FF_ReleaseSemaphore( pxIOManager->pvSemaphore );
}
if( pxMatchingBuffer == NULL )
{
FF_PRINTF( "FF_GetBuffer[0x%X]: failed mode 0x%X\n", ( unsigned ) ulSector, ( unsigned ) ucMode );
}
return pxMatchingBuffer; /* Return the Matched Buffer! */
} /* FF_GetBuffer() */
/*-----------------------------------------------------------*/
/**
* @brief Releases a buffer resource.
*
* @param pxIOManager Pointer to an FF_IOManager_t object.
* @param pxBuffer Pointer to an FF_Buffer_t object.
*
**/
FF_Error_t FF_ReleaseBuffer( FF_IOManager_t * pxIOManager,
FF_Buffer_t * pxBuffer )
{
FF_Error_t xError = FF_ERR_NONE;
/* Protect description changes with a semaphore. */
FF_PendSemaphore( pxIOManager->pvSemaphore );
{
#if ( ffconfigCACHE_WRITE_THROUGH != 0 )
if( pxBuffer->bModified == pdTRUE )
{
xError = FF_BlockWrite( pxIOManager, pxBuffer->ulSector, 1, pxBuffer->pucBuffer, pdTRUE );
if( FF_isERR( xError ) == pdFALSE )
{
/* Ensure if an error occurs its still possible to write the block again. */
pxBuffer->bModified = pdFALSE;
}
}
#endif /* if ( ffconfigCACHE_WRITE_THROUGH != 0 ) */
configASSERT( pxBuffer->usNumHandles != 0 );
if( pxBuffer->usNumHandles != 0 )
{
pxBuffer->usNumHandles--;
}
else
{
/*printf ("FF_ReleaseBuffer: buffer not claimed\n"); */
}
}
FF_ReleaseSemaphore( pxIOManager->pvSemaphore );
/* Notify tasks which may be waiting in FF_GetBuffer() */
FF_BufferProceed( pxIOManager );
return xError;
} /* FF_ReleaseBuffer() */
/*-----------------------------------------------------------*/
/* New Interface for FreeRTOS+FAT to read blocks. */
int32_t FF_BlockRead( FF_IOManager_t * pxIOManager,
uint32_t ulSectorLBA,
uint32_t ulNumSectors,
void * pxBuffer,
BaseType_t xSemLocked )
{
int32_t slRetVal = 0;
if( pxIOManager->xPartition.ulTotalSectors != 0ul )
{
/* At some point while formatting a partition, ulTotalSectors might be unknown.
* In that case this test will be skipped. */
if( ( ulSectorLBA + ulNumSectors ) > ( pxIOManager->xPartition.ulTotalSectors + pxIOManager->xPartition.ulBeginLBA ) )
{
slRetVal = FF_createERR( FF_ERR_IOMAN_OUT_OF_BOUNDS_READ, FF_BLOCKREAD );
}
}
if( ( slRetVal == 0ul ) && ( pxIOManager->xBlkDevice.fnpReadBlocks != NULL ) )
{
do
{
/* Make sure we don't execute a NULL. */
if( ( xSemLocked == pdFALSE ) &&
( ( pxIOManager->ucFlags & FF_IOMAN_BLOCK_DEVICE_IS_REENTRANT ) == pdFALSE ) )
{
FF_PendSemaphore( pxIOManager->pvSemaphore );
}
slRetVal = pxIOManager->xBlkDevice.fnpReadBlocks( pxBuffer, ulSectorLBA, ulNumSectors, pxIOManager->xBlkDevice.pxDisk );
if( ( xSemLocked == pdFALSE ) &&
( ( pxIOManager->ucFlags & FF_IOMAN_BLOCK_DEVICE_IS_REENTRANT ) == pdFALSE ) )
{
FF_ReleaseSemaphore( pxIOManager->pvSemaphore );
}
/* Do not use 'FF_GETERROR()' here because FF_ERR_DRIVER_BUSY
* is a full 32-bit error code, containing module, function and
* the actual error code. See 'ff_error.h' for definitions. */
if( slRetVal != ( int32_t ) FF_ERR_DRIVER_BUSY )
{
break;
}
FF_Sleep( ffconfigDRIVER_BUSY_SLEEP_MS );
} while( pdTRUE );
}
return slRetVal;
} /* FF_BlockRead() */
/*-----------------------------------------------------------*/
int32_t FF_BlockWrite( FF_IOManager_t * pxIOManager,
uint32_t ulSectorLBA,
uint32_t ulNumSectors,
void * pxBuffer,
BaseType_t xSemLocked )
{
int32_t slRetVal = 0;
if( pxIOManager->xPartition.ulTotalSectors != 0 )
{
/* At some point while formatting a partition, ulTotalSectors might be unknown.
* In that case this test will be skipped. */
if( ( ulSectorLBA + ulNumSectors ) > ( pxIOManager->xPartition.ulTotalSectors + pxIOManager->xPartition.ulBeginLBA ) )
{
slRetVal = FF_createERR( FF_ERR_IOMAN_OUT_OF_BOUNDS_WRITE, FF_BLOCKWRITE );
}
}
if( ( slRetVal == 0ul ) && ( pxIOManager->xBlkDevice.fnpWriteBlocks != NULL ) )
{
do
{ /* Make sure we don't execute a NULL. */
if( ( xSemLocked == pdFALSE ) &&
( ( pxIOManager->ucFlags & FF_IOMAN_BLOCK_DEVICE_IS_REENTRANT ) == pdFALSE ) )
{
FF_PendSemaphore( pxIOManager->pvSemaphore );
}
slRetVal = pxIOManager->xBlkDevice.fnpWriteBlocks( pxBuffer, ulSectorLBA, ulNumSectors, pxIOManager->xBlkDevice.pxDisk );
if( ( xSemLocked == pdFALSE ) &&
( ( pxIOManager->ucFlags & FF_IOMAN_BLOCK_DEVICE_IS_REENTRANT ) == pdFALSE ) )
{
FF_ReleaseSemaphore( pxIOManager->pvSemaphore );
}
/* Do not use 'FF_GETERROR()' here because FF_ERR_DRIVER_BUSY
* is a full 32-bit error code, containing module, function and
* the actual error code. See 'ff_error.h' for definitions. */
if( slRetVal != ( int32_t ) FF_ERR_DRIVER_BUSY )
{
break;
}
FF_Sleep( ffconfigDRIVER_BUSY_SLEEP_MS );
} while( pdTRUE );
}
return slRetVal;
} /* FF_BlockWrite() */
/*-----------------------------------------------------------*/
/*
* This global variable is a kind of expert option:
* It may be set to one of these values: FF_T_FAT[12,16,32]
* just to force the driver to assume a certain FAT type.
*/
static uint8_t ucAssumeFATType = 0;
/* The history of FAT types:
* The Microsoft documents says that the actual type: FAT-12, FAT-16 and FAT-32
* of a partition can be found by looking at the total number of data clusters:
*
* if( clusters < 4085 )
* Assume FAT-12
* else if( clusters < 65525 )
* Assume FAT-16
* else
* Assume FAT-32
*
* In practice however, this does not always seem to be a correct assumption.
*
* The first 12 or 16 bits in the FAT table may also help to determine the
* correct FAT-type:
*
* FAT-12: ( firstWord & 0x3FF ) == 0x3F8 )
* FAT-16: ( firstWord == 0xFFF8 )
*/
static FF_Error_t prvDetermineFatType( FF_IOManager_t * pxIOManager )
{
FF_Partition_t * pxPartition;
FF_Buffer_t * pxBuffer;
uint32_t ulFirstWord = 0ul;
FF_Error_t xError = FF_ERR_NONE;
pxPartition = &( pxIOManager->xPartition );
if( ucAssumeFATType != 0 )
{
switch( ucAssumeFATType )
{
case FF_T_FAT12:
case FF_T_FAT16:
case FF_T_FAT32:
pxPartition->ucType = ucAssumeFATType;
break;
default:
/* An invalid value will be ignored, and the FAT type is determined dynamically. */
ucAssumeFATType = 0;
break;
}
xError = FF_ERR_NONE;
}
/* Test again, the value may have become zero now: */
if( ucAssumeFATType == 0 )
{
pxBuffer = FF_GetBuffer( pxIOManager, pxIOManager->xPartition.ulFATBeginLBA, FF_MODE_READ );
if( pxBuffer == NULL )
{
xError = FF_createERR( FF_ERR_DEVICE_DRIVER_FAILED, FF_DETERMINEFATTYPE );
}
else
{
ulFirstWord = ( uint32_t ) FF_getShort( pxBuffer->pucBuffer, 0x0000 );
xError = FF_ReleaseBuffer( pxIOManager, pxBuffer );
}
}
if( ( ucAssumeFATType == 0 ) && ( FF_isERR( xError ) == pdFALSE ) )
{
#if ( ffconfigFAT12_SUPPORT != 0 )
if( pxPartition->ulNumClusters < FAT16_SECTOR_COUNT_4085 )
{
/* FAT12 */
pxPartition->ucType = FF_T_FAT12;
#if ( ffconfigFAT_CHECK != 0 )
if( ( ulFirstWord & 0x3FF ) != 0x3F8 )
{
xError = FF_createERR( FF_ERR_IOMAN_NOT_FAT_FORMATTED, FF_DETERMINEFATTYPE );
}
else
#endif /* ffconfigFAT_CHECK */
{
xError = FF_ERR_NONE;
}
}
else
#endif /* ffconfigFAT12_SUPPORT */
if( pxPartition->ulNumClusters < FAT32_SECTOR_COUNT_65525 )
{
/* FAT 16 */
pxPartition->ucType = FF_T_FAT16;
#if ( ffconfigFAT_CHECK != 0 )
{
if( ulFirstWord == 0xFFF8 )
{
xError = FF_ERR_NONE;
}
else
{
if( ( ulFirstWord & 0x3FF ) != 0x3F8 )
{
FF_PRINTF( "Part at %lu is probably a FAT12\n", pxIOManager->xPartition.ulFATBeginLBA );
}
else
{
FF_PRINTF( "Partition at %lu has strange FAT data %08lX\n",
pxIOManager->xPartition.ulFATBeginLBA, ulFirstWord );
}
xError = FF_createERR( FF_ERR_IOMAN_INVALID_FORMAT, FF_DETERMINEFATTYPE );
}
}
#endif /* ffconfigFAT_CHECK */
}
else
{
/* FAT 32! */
pxPartition->ucType = FF_T_FAT32;
#if ( ffconfigFAT_CHECK != 0 )
if( ( ( ulFirstWord & 0x0FFFFFF8 ) != 0x0FFFFFF8 ) &&
( ( ulFirstWord & 0x0FFFFFF8 ) != 0x0FFFFFF0 ) )
{
/* _HT_
* I had an SD-card which worked well in Linux/W32
* but FreeRTOS+FAT returned me this error
* So for me I left out this check (just issue a warning for now)
*/
FF_PRINTF( "prvDetermineFatType: firstWord %08lX\n", ulFirstWord );
xError = FF_ERR_NONE; /* FF_ERR_IOMAN_NOT_FAT_FORMATTED; */
}
#endif /* ffconfigFAT_CHECK */
xError = FF_ERR_NONE;
}
}
return xError;
} /* prvDetermineFatType() */
/*-----------------------------------------------------------*/
/* Check if ucPartitionID introduces an extended partition. */
static BaseType_t prvIsExtendedPartition( uint8_t ucPartitionID )
{
BaseType_t xResult;
if( ( ucPartitionID == FF_DOS_EXT_PART ) ||
( ucPartitionID == FF_WIN98_EXT_PART ) ||
( ucPartitionID == FF_LINUX_EXT_PART ) )
{
xResult = pdTRUE;
}
else
{
xResult = pdFALSE;
}
return xResult;
} /* prvIsExtendedPartition() */
/*-----------------------------------------------------------*/
/* Check if the media byte in an MBR is valid */
static BaseType_t prvIsValidMedia( uint8_t media )
{
BaseType_t xResult;
/*
* 0xF8 is the standard value for fixed (non-removable) media. For
* removable media, 0xF0 is frequently used. The legal values for this
* field are 0xF0, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, and
* 0xFF. The only other important point is that whatever value is put
* in here must also be put in the low byte of the FAT[0] entry. This
* dates back to the old MS-DOS 1.x media determination noted
* earlier and is no longer usually used for anything.
*/
if( ( 0xf8 <= media ) || ( media == 0xf0 ) )
{
xResult = pdTRUE;
}
else
{
xResult = pdFALSE;
}
return xResult;
} /* prvIsValidMedia() */
/*-----------------------------------------------------------*/
void FF_ReadParts( uint8_t * pucBuffer,
FF_Part_t * pxParts )
{
BaseType_t xPartNr;
UBaseType_t uxOffset = FF_FAT_PTBL;
/* pxParts is expected to be declared as an array of 4 elements:
* FF_Part_t pxParts[4];
* FF_ReadParts( pxBuffer->pucBuffer, pxParts );
*/
for( xPartNr = 0; xPartNr < 4; xPartNr++, uxOffset += 16, pxParts++ )
{
pxParts->ucActive = FF_getChar( pucBuffer, ( uint32_t ) ( uxOffset + FF_FAT_PTBL_ACTIVE ) );
pxParts->ucPartitionID = FF_getChar( pucBuffer, ( uint32_t ) ( uxOffset + FF_FAT_PTBL_ID ) );
pxParts->ulSectorCount = FF_getLong( pucBuffer, ( uint32_t ) ( uxOffset + FF_FAT_PTBL_SECT_COUNT ) );
pxParts->ulStartLBA = FF_getLong( pucBuffer, ( uint32_t ) ( uxOffset + FF_FAT_PTBL_LBA ) );
}
}
/*-----------------------------------------------------------*/
/* This function will traverse through a chain of extended partitions. */
/* It is protected against rubbish data by a counter. */
static FF_Error_t FF_ParseExtended( FF_IOManager_t * pxIOManager,
uint32_t ulFirstSector,
uint32_t ulFirstSize,
FF_SPartFound_t * pPartsFound )
{
uint32_t ulThisSector, ulThisSize;
uint32_t ulSectorSize = pxIOManager->usSectorSize / 512;
uint32_t prevTotalSectors = pxIOManager->xPartition.ulTotalSectors;
FF_Buffer_t * pxBuffer = NULL;
BaseType_t xTryCount = 100;
BaseType_t xPartNr;
BaseType_t xExtendedPartNr;
FF_Error_t xError = FF_ERR_NONE;
FF_Part_t pxPartitions[ 4 ];
ulThisSector = ulFirstSector;
ulThisSize = ulFirstSize;
/* Disable sector checking in FF_BlockRead, because the
* exact disk (partition) parameters are not yet known.
* Let user driver return an error is appropriate. */
pxIOManager->xPartition.ulTotalSectors = 0;
while( xTryCount-- )
{
if( ( pxBuffer == NULL ) || ( pxBuffer->ulSector != ulThisSector ) )
{
/* Moving to a different sector. Release the
* previous one and allocate a new buffer. */
if( pxBuffer != NULL )
{
xError = FF_ReleaseBuffer( pxIOManager, pxBuffer );
pxBuffer = NULL;
if( FF_isERR( xError ) )
{
break;
}
}
FF_PRINTF( "FF_ParseExtended: Read sector %u\n", ( unsigned ) ulThisSector );
pxBuffer = FF_GetBuffer( pxIOManager, ulThisSector, FF_MODE_READ );
if( pxBuffer == NULL )
{
xError = FF_createERR( FF_ERR_DEVICE_DRIVER_FAILED, FF_PARSEEXTENDED );
break;
}
}
{
uint8_t a = FF_getChar( pxBuffer->pucBuffer, FF_FAT_MBR_SIGNATURE + 0 );
uint8_t b = FF_getChar( pxBuffer->pucBuffer, FF_FAT_MBR_SIGNATURE + 1 );
if( ( a != 0x55 ) || ( b != 0xAA ) )
{
FF_PRINTF( "FF_ParseExtended: No signature %02X,%02X\n", a, b );
break;
}
}
/* Check for data partition(s),
* and remember if there is an extended partition */
FF_ReadParts( pxBuffer->pucBuffer, pxPartitions );
/* Assume there is no next ext partition. */
xExtendedPartNr = -1;
for( xPartNr = 0; xPartNr < 4; xPartNr++ )
{
uint32_t ulOffset, ulSize, ulNext;
if( pxPartitions[ xPartNr ].ulSectorCount == 0 )
{
/* Partition is empty */
continue;
}
if( prvIsExtendedPartition( pxPartitions[ xPartNr ].ucPartitionID ) )
{
if( xExtendedPartNr < 0 )
{
xExtendedPartNr = xPartNr;
}
continue; /* We'll examine this ext partition later */
}
/* Some sanity checks */
ulOffset = pxPartitions[ xPartNr ].ulStartLBA * ulSectorSize;
ulSize = pxPartitions[ xPartNr ].ulSectorCount * ulSectorSize;
ulNext = ulThisSector + ulOffset;
if(
/* Is it oversized? */
( ulOffset + ulSize > ulThisSize ) ||
/* or going backward? */
( ulNext < ulFirstSector ) ||