DataflashManager.c 18.8 KB
Newer Older
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
/*
             LUFA Library
     Copyright (C) Dean Camera, 2010.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this 
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in 
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting 
  documentation, and that the name of the author not be used in 
  advertising or publicity pertaining to distribution of the 
  software without specific, written prior permission.

  The author disclaim all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *
33
 *  Functions to manage the physical Dataflash media, including reading and writing of
34
35
36
37
38
39
40
41
 *  blocks of data. These functions are called by the SCSI layer when data must be stored
 *  or retrieved to/from the physical storage media. If a different media is used (such
 *  as a SD card or EEPROM), functions similar to these will need to be generated.
 */

#define  INCLUDE_FROM_DATAFLASHMANAGER_C
#include "DataflashManager.h"

42
/** Writes blocks (OS blocks, not Dataflash pages) to the storage medium, the board Dataflash IC(s), from
43
 *  the pre-selected data OUT endpoint. This routine reads in OS sized blocks from the endpoint and writes
44
 *  them to the Dataflash in Dataflash page sized blocks.
45
46
47
48
49
 *
 *  \param[in] MSInterfaceInfo  Pointer to a structure containing a Mass Storage Class configuration and state
 *  \param[in] BlockAddress  Data block starting address for the write sequence
 *  \param[in] TotalBlocks   Number of blocks of data to write
 */
50
51
52
void DataflashManager_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
                                  const uint32_t BlockAddress,
                                  uint16_t TotalBlocks)
53
54
55
56
57
58
59
60
61
62
{
	uint16_t CurrDFPage          = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) / DATAFLASH_PAGE_SIZE);
	uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);
	uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);
	bool     UsingSecondBuffer   = false;

	/* Select the correct starting Dataflash IC for the block requested */
	Dataflash_SelectChipFromPage(CurrDFPage);

#if (DATAFLASH_PAGE_SIZE > VIRTUAL_MEMORY_BLOCK_SIZE)
63
	/* Copy selected dataflash's current page contents to the Dataflash buffer */
64
65
66
67
68
	Dataflash_SendByte(DF_CMD_MAINMEMTOBUFF1);
	Dataflash_SendAddressBytes(CurrDFPage, 0);
	Dataflash_WaitWhileBusy();
#endif

69
	/* Send the Dataflash buffer write command */
70
71
72
73
74
75
76
77
78
79
80
	Dataflash_SendByte(DF_CMD_BUFF1WRITE);
	Dataflash_SendAddressBytes(0, CurrDFPageByte);

	/* Wait until endpoint is ready before continuing */
	if (Endpoint_WaitUntilReady())
	  return;

	while (TotalBlocks)
	{
		uint8_t BytesInBlockDiv16 = 0;
		
81
		/* Write an endpoint packet sized data block to the Dataflash */
82
83
84
85
86
87
88
89
90
91
92
93
94
		while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
		{
			/* Check if the endpoint is currently empty */
			if (!(Endpoint_IsReadWriteAllowed()))
			{
				/* Clear the current endpoint bank */
				Endpoint_ClearOUT();
				
				/* Wait until the host has sent another packet */
				if (Endpoint_WaitUntilReady())
				  return;
			}

95
			/* Check if end of Dataflash page reached */
96
97
			if (CurrDFPageByteDiv16 == (DATAFLASH_PAGE_SIZE >> 4))
			{
98
				/* Write the Dataflash buffer contents back to the Dataflash page */
99
100
101
102
				Dataflash_WaitWhileBusy();
				Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2TOMAINMEMWITHERASE : DF_CMD_BUFF1TOMAINMEMWITHERASE);
				Dataflash_SendAddressBytes(CurrDFPage, 0);

103
				/* Reset the Dataflash buffer counter, increment the page counter */
104
105
106
				CurrDFPageByteDiv16 = 0;
				CurrDFPage++;

107
				/* Once all the Dataflash ICs have had their first buffers filled, switch buffers to maintain throughput */
108
109
110
				if (Dataflash_GetSelectedChip() == DATAFLASH_CHIP_MASK(DATAFLASH_TOTALCHIPS))
				  UsingSecondBuffer = !(UsingSecondBuffer);

111
				/* Select the next Dataflash chip based on the new Dataflash page index */
112
113
114
				Dataflash_SelectChipFromPage(CurrDFPage);

#if (DATAFLASH_PAGE_SIZE > VIRTUAL_MEMORY_BLOCK_SIZE)
115
				/* If less than one Dataflash page remaining, copy over the existing page to preserve trailing data */
116
117
				if ((TotalBlocks * (VIRTUAL_MEMORY_BLOCK_SIZE >> 4)) < (DATAFLASH_PAGE_SIZE >> 4))
				{
118
					/* Copy selected dataflash's current page contents to the Dataflash buffer */
119
120
121
122
123
124
125
					Dataflash_WaitWhileBusy();
					Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_MAINMEMTOBUFF2 : DF_CMD_MAINMEMTOBUFF1);
					Dataflash_SendAddressBytes(CurrDFPage, 0);
					Dataflash_WaitWhileBusy();
				}
#endif

126
				/* Send the Dataflash buffer write command */
127
128
129
130
				Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2WRITE : DF_CMD_BUFF1WRITE);
				Dataflash_SendAddressBytes(0, 0);				
			}

131
			/* Write one 16-byte chunk of data to the Dataflash */
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			Dataflash_SendByte(Endpoint_Read_Byte());
			
149
			/* Increment the Dataflash page 16 byte block counter */
150
151
152
153
154
155
156
157
158
159
160
161
162
163
			CurrDFPageByteDiv16++;

			/* Increment the block 16 byte block counter */
			BytesInBlockDiv16++;

			/* Check if the current command is being aborted by the host */
			if (MSInterfaceInfo->State.IsMassStoreReset)
			  return;			
		}
			
		/* Decrement the blocks remaining counter and reset the sub block counter */
		TotalBlocks--;
	}

164
	/* Write the Dataflash buffer contents back to the Dataflash page */
165
166
167
168
169
170
171
172
173
	Dataflash_WaitWhileBusy();
	Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2TOMAINMEMWITHERASE : DF_CMD_BUFF1TOMAINMEMWITHERASE);
	Dataflash_SendAddressBytes(CurrDFPage, 0x00);
	Dataflash_WaitWhileBusy();

	/* If the endpoint is empty, clear it ready for the next packet from the host */
	if (!(Endpoint_IsReadWriteAllowed()))
	  Endpoint_ClearOUT();

174
	/* Deselect all Dataflash chips */
175
176
177
	Dataflash_DeselectChip();
}

178
/** Reads blocks (OS blocks, not Dataflash pages) from the storage medium, the board Dataflash IC(s), into
179
180
181
182
183
184
185
 *  the pre-selected data IN endpoint. This routine reads in Dataflash page sized blocks from the Dataflash
 *  and writes them in OS sized blocks to the endpoint.
 *
 *  \param[in] MSInterfaceInfo  Pointer to a structure containing a Mass Storage Class configuration and state
 *  \param[in] BlockAddress  Data block starting address for the read sequence
 *  \param[in] TotalBlocks   Number of blocks of data to read
 */
186
187
188
void DataflashManager_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
                                 const uint32_t BlockAddress,
                                 uint16_t TotalBlocks)
189
190
191
192
193
194
195
196
{
	uint16_t CurrDFPage          = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) / DATAFLASH_PAGE_SIZE);
	uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);
	uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);

	/* Select the correct starting Dataflash IC for the block requested */
	Dataflash_SelectChipFromPage(CurrDFPage);

197
	/* Send the Dataflash main memory page read command */
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
	Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);
	Dataflash_SendAddressBytes(CurrDFPage, CurrDFPageByte);
	Dataflash_SendByte(0x00);
	Dataflash_SendByte(0x00);
	Dataflash_SendByte(0x00);
	Dataflash_SendByte(0x00);
	
	/* Wait until endpoint is ready before continuing */
	if (Endpoint_WaitUntilReady())
	  return;
	
	while (TotalBlocks)
	{
		uint8_t BytesInBlockDiv16 = 0;
		
213
		/* Write an endpoint packet sized data block to the Dataflash */
214
215
216
217
218
219
220
221
222
223
224
225
226
		while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
		{
			/* Check if the endpoint is currently full */
			if (!(Endpoint_IsReadWriteAllowed()))
			{
				/* Clear the endpoint bank to send its contents to the host */
				Endpoint_ClearIN();
				
				/* Wait until the endpoint is ready for more data */
				if (Endpoint_WaitUntilReady())
				  return;
			}
			
227
			/* Check if end of Dataflash page reached */
228
229
			if (CurrDFPageByteDiv16 == (DATAFLASH_PAGE_SIZE >> 4))
			{
230
				/* Reset the Dataflash buffer counter, increment the page counter */
231
232
233
				CurrDFPageByteDiv16 = 0;
				CurrDFPage++;

234
				/* Select the next Dataflash chip based on the new Dataflash page index */
235
236
				Dataflash_SelectChipFromPage(CurrDFPage);
				
237
				/* Send the Dataflash main memory page read command */
238
239
240
241
242
243
244
245
				Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);
				Dataflash_SendAddressBytes(CurrDFPage, 0);
				Dataflash_SendByte(0x00);
				Dataflash_SendByte(0x00);
				Dataflash_SendByte(0x00);
				Dataflash_SendByte(0x00);
			}	

246
			/* Read one 16-byte chunk of data from the Dataflash */
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			Endpoint_Write_Byte(Dataflash_ReceiveByte());
			
264
			/* Increment the Dataflash page 16 byte block counter */
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
			CurrDFPageByteDiv16++;
			
			/* Increment the block 16 byte block counter */
			BytesInBlockDiv16++;

			/* Check if the current command is being aborted by the host */
			if (MSInterfaceInfo->State.IsMassStoreReset)
			  return;
		}
		
		/* Decrement the blocks remaining counter */
		TotalBlocks--;
	}
	
	/* If the endpoint is full, send its contents to the host */
	if (!(Endpoint_IsReadWriteAllowed()))
	  Endpoint_ClearIN();

283
	/* Deselect all Dataflash chips */
284
285
286
	Dataflash_DeselectChip();
}

287
/** Writes blocks (OS blocks, not Dataflash pages) to the storage medium, the board Dataflash IC(s), from
288
 *  the a given RAM buffer. This routine reads in OS sized blocks from the buffer and writes them to the
289
290
 *  Dataflash in Dataflash page sized blocks. This can be linked to FAT libraries to write files to the
 *  Dataflash.
291
292
293
294
295
 *
 *  \param[in] BlockAddress  Data block starting address for the write sequence
 *  \param[in] TotalBlocks   Number of blocks of data to write
 *  \param[in] BufferPtr     Pointer to the data source RAM buffer
 */
296
297
298
void DataflashManager_WriteBlocks_RAM(const uint32_t BlockAddress,
                                      uint16_t TotalBlocks,
                                      uint8_t* BufferPtr)
299
300
301
302
303
304
305
306
307
308
{
	uint16_t CurrDFPage          = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) / DATAFLASH_PAGE_SIZE);
	uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);
	uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);
	bool     UsingSecondBuffer   = false;

	/* Select the correct starting Dataflash IC for the block requested */
	Dataflash_SelectChipFromPage(CurrDFPage);

#if (DATAFLASH_PAGE_SIZE > VIRTUAL_MEMORY_BLOCK_SIZE)
309
	/* Copy selected dataflash's current page contents to the Dataflash buffer */
310
311
312
313
314
	Dataflash_SendByte(DF_CMD_MAINMEMTOBUFF1);
	Dataflash_SendAddressBytes(CurrDFPage, 0);
	Dataflash_WaitWhileBusy();
#endif

315
	/* Send the Dataflash buffer write command */
316
317
318
319
320
321
322
	Dataflash_SendByte(DF_CMD_BUFF1WRITE);
	Dataflash_SendAddressBytes(0, CurrDFPageByte);
	
	while (TotalBlocks)
	{
		uint8_t BytesInBlockDiv16 = 0;
		
323
		/* Write an endpoint packet sized data block to the Dataflash */
324
325
		while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
		{
326
			/* Check if end of Dataflash page reached */
327
328
			if (CurrDFPageByteDiv16 == (DATAFLASH_PAGE_SIZE >> 4))
			{
329
				/* Write the Dataflash buffer contents back to the Dataflash page */
330
331
332
333
				Dataflash_WaitWhileBusy();
				Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2TOMAINMEMWITHERASE : DF_CMD_BUFF1TOMAINMEMWITHERASE);
				Dataflash_SendAddressBytes(CurrDFPage, 0);

334
				/* Reset the Dataflash buffer counter, increment the page counter */
335
336
337
				CurrDFPageByteDiv16 = 0;
				CurrDFPage++;

338
				/* Once all the Dataflash ICs have had their first buffers filled, switch buffers to maintain throughput */
339
340
341
				if (Dataflash_GetSelectedChip() == DATAFLASH_CHIP_MASK(DATAFLASH_TOTALCHIPS))
				  UsingSecondBuffer = !(UsingSecondBuffer);

342
				/* Select the next Dataflash chip based on the new Dataflash page index */
343
344
345
				Dataflash_SelectChipFromPage(CurrDFPage);

#if (DATAFLASH_PAGE_SIZE > VIRTUAL_MEMORY_BLOCK_SIZE)
346
				/* If less than one Dataflash page remaining, copy over the existing page to preserve trailing data */
347
348
				if ((TotalBlocks * (VIRTUAL_MEMORY_BLOCK_SIZE >> 4)) < (DATAFLASH_PAGE_SIZE >> 4))
				{
349
					/* Copy selected dataflash's current page contents to the Dataflash buffer */
350
351
352
353
354
355
356
					Dataflash_WaitWhileBusy();
					Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_MAINMEMTOBUFF2 : DF_CMD_MAINMEMTOBUFF1);
					Dataflash_SendAddressBytes(CurrDFPage, 0);
					Dataflash_WaitWhileBusy();
				}
#endif

357
				/* Send the Dataflash buffer write command */
358
359
360
361
362
				Dataflash_ToggleSelectedChipCS();
				Dataflash_SendByte(DF_CMD_BUFF1WRITE);
				Dataflash_SendAddressBytes(0, 0);
			}
			
363
			/* Write one 16-byte chunk of data to the Dataflash */
364
365
366
			for (uint8_t ByteNum = 0; ByteNum < 16; ByteNum++)
			  Dataflash_SendByte(*(BufferPtr++));
			
367
			/* Increment the Dataflash page 16 byte block counter */
368
369
370
371
372
373
374
375
376
377
			CurrDFPageByteDiv16++;

			/* Increment the block 16 byte block counter */
			BytesInBlockDiv16++;		
		}
			
		/* Decrement the blocks remaining counter and reset the sub block counter */
		TotalBlocks--;
	}

378
	/* Write the Dataflash buffer contents back to the Dataflash page */
379
380
381
382
383
	Dataflash_WaitWhileBusy();
	Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2TOMAINMEMWITHERASE : DF_CMD_BUFF1TOMAINMEMWITHERASE);
	Dataflash_SendAddressBytes(CurrDFPage, 0x00);
	Dataflash_WaitWhileBusy();

384
	/* Deselect all Dataflash chips */
385
386
387
	Dataflash_DeselectChip();
}

388
/** Reads blocks (OS blocks, not Dataflash pages) from the storage medium, the board Dataflash IC(s), into
389
390
 *  the a preallocated RAM buffer. This routine reads in Dataflash page sized blocks from the Dataflash
 *  and writes them in OS sized blocks to the given buffer. This can be linked to FAT libraries to read
391
 *  the files stored on the Dataflash.
392
393
394
395
396
 *
 *  \param[in] BlockAddress  Data block starting address for the read sequence
 *  \param[in] TotalBlocks   Number of blocks of data to read
 *  \param[out] BufferPtr    Pointer to the data destination RAM buffer
 */
397
398
399
void DataflashManager_ReadBlocks_RAM(const uint32_t BlockAddress,
                                     uint16_t TotalBlocks,
                                     uint8_t* BufferPtr)
400
401
402
403
404
405
406
407
{
	uint16_t CurrDFPage          = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) / DATAFLASH_PAGE_SIZE);
	uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);
	uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);

	/* Select the correct starting Dataflash IC for the block requested */
	Dataflash_SelectChipFromPage(CurrDFPage);

408
	/* Send the Dataflash main memory page read command */
409
410
411
412
413
414
415
416
417
418
419
	Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);
	Dataflash_SendAddressBytes(CurrDFPage, CurrDFPageByte);
	Dataflash_SendByte(0x00);
	Dataflash_SendByte(0x00);
	Dataflash_SendByte(0x00);
	Dataflash_SendByte(0x00);

	while (TotalBlocks)
	{
		uint8_t BytesInBlockDiv16 = 0;
		
420
		/* Write an endpoint packet sized data block to the Dataflash */
421
422
		while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
		{
423
			/* Check if end of Dataflash page reached */
424
425
			if (CurrDFPageByteDiv16 == (DATAFLASH_PAGE_SIZE >> 4))
			{
426
				/* Reset the Dataflash buffer counter, increment the page counter */
427
428
429
				CurrDFPageByteDiv16 = 0;
				CurrDFPage++;

430
				/* Select the next Dataflash chip based on the new Dataflash page index */
431
432
				Dataflash_SelectChipFromPage(CurrDFPage);
				
433
				/* Send the Dataflash main memory page read command */
434
435
436
437
438
439
440
441
				Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);
				Dataflash_SendAddressBytes(CurrDFPage, 0);
				Dataflash_SendByte(0x00);
				Dataflash_SendByte(0x00);
				Dataflash_SendByte(0x00);
				Dataflash_SendByte(0x00);
			}	

442
			/* Read one 16-byte chunk of data from the Dataflash */
443
444
445
			for (uint8_t ByteNum = 0; ByteNum < 16; ByteNum++)
			  *(BufferPtr++) = Dataflash_ReceiveByte();
			
446
			/* Increment the Dataflash page 16 byte block counter */
447
448
449
450
451
452
453
454
455
456
			CurrDFPageByteDiv16++;
			
			/* Increment the block 16 byte block counter */
			BytesInBlockDiv16++;
		}
		
		/* Decrement the blocks remaining counter */
		TotalBlocks--;
	}

457
	/* Deselect all Dataflash chips */
458
459
460
	Dataflash_DeselectChip();
}

461
/** Disables the Dataflash memory write protection bits on the board Dataflash ICs, if enabled. */
462
463
void DataflashManager_ResetDataflashProtections(void)
{
464
	/* Select first Dataflash chip, send the read status register command */
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
	Dataflash_SelectChip(DATAFLASH_CHIP1);
	Dataflash_SendByte(DF_CMD_GETSTATUS);
	
	/* Check if sector protection is enabled */
	if (Dataflash_ReceiveByte() & DF_STATUS_SECTORPROTECTION_ON)
	{
		Dataflash_ToggleSelectedChipCS();

		/* Send the commands to disable sector protection */
		Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[0]);
		Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[1]);
		Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[2]);
		Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[3]);
	}
	
480
	/* Select second Dataflash chip (if present on selected board), send read status register command */
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
	#if (DATAFLASH_TOTALCHIPS == 2)
	Dataflash_SelectChip(DATAFLASH_CHIP2);
	Dataflash_SendByte(DF_CMD_GETSTATUS);
	
	/* Check if sector protection is enabled */
	if (Dataflash_ReceiveByte() & DF_STATUS_SECTORPROTECTION_ON)
	{
		Dataflash_ToggleSelectedChipCS();

		/* Send the commands to disable sector protection */
		Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[0]);
		Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[1]);
		Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[2]);
		Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[3]);
	}
	#endif
	
498
	/* Deselect current Dataflash chip */
499
500
	Dataflash_DeselectChip();
}