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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [drivers/] [ST/] [STM32F10xFWLib/] [src/] [stm32f10x_flash.c] - Blame information for rev 608

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1 608 jeremybenn 
/**
2 
  ******************************************************************************
3 
  * @file  stm32f10x_flash.c
4 
  * @author  MCD Application Team
5 
  * @version  V3.0.0
6 
  * @date  04/06/2009
7 
  * @brief  This file provides all the FLASH firmware functions.
8 
  ******************************************************************************
9 
  * @copy
10 
  *
11 
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
12 
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
13 
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
14 
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
15 
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
16 
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
17 
  *
18 
  * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>
19 
  */
20 
 
21 
/* Includes ------------------------------------------------------------------*/
22 
#include "stm32f10x_flash.h"
23 
 
24 
/** @addtogroup StdPeriph_Driver
25 
  * @{
26 
  */
27 
 
28 
/** @defgroup FLASH
29 
  * @brief FLASH driver modules
30 
  * @{
31 
  */
32 
 
33 
/** @defgroup FLASH_Private_TypesDefinitions
34 
  * @{
35 
  */
36 
 
37 
/**
38 
  * @}
39 
  */
40 
 
41 
/** @defgroup FLASH_Private_Defines
42 
  * @{
43 
  */
44 
 
45 
/* Flash Access Control Register bits */
46 
#define ACR_LATENCY_Mask         ((uint32_t)0x00000038)
47 
#define ACR_HLFCYA_Mask          ((uint32_t)0xFFFFFFF7)
48 
#define ACR_PRFTBE_Mask          ((uint32_t)0xFFFFFFEF)
49 
 
50 
/* Flash Access Control Register bits */
51 
#define ACR_PRFTBS_Mask          ((uint32_t)0x00000020)
52 
 
53 
/* Flash Control Register bits */
54 
#define CR_PG_Set                ((uint32_t)0x00000001)
55 
#define CR_PG_Reset              ((uint32_t)0x00001FFE)
56 
#define CR_PER_Set               ((uint32_t)0x00000002)
57 
#define CR_PER_Reset             ((uint32_t)0x00001FFD)
58 
#define CR_MER_Set               ((uint32_t)0x00000004)
59 
#define CR_MER_Reset             ((uint32_t)0x00001FFB)
60 
#define CR_OPTPG_Set             ((uint32_t)0x00000010)
61 
#define CR_OPTPG_Reset           ((uint32_t)0x00001FEF)
62 
#define CR_OPTER_Set             ((uint32_t)0x00000020)
63 
#define CR_OPTER_Reset           ((uint32_t)0x00001FDF)
64 
#define CR_STRT_Set              ((uint32_t)0x00000040)
65 
#define CR_LOCK_Set              ((uint32_t)0x00000080)
66 
 
67 
/* FLASH Mask */
68 
#define RDPRT_Mask               ((uint32_t)0x00000002)
69 
#define WRP0_Mask                ((uint32_t)0x000000FF)
70 
#define WRP1_Mask                ((uint32_t)0x0000FF00)
71 
#define WRP2_Mask                ((uint32_t)0x00FF0000)
72 
#define WRP3_Mask                ((uint32_t)0xFF000000)
73 
 
74 
/* FLASH Keys */
75 
#define RDP_Key                  ((uint16_t)0x00A5)
76 
#define FLASH_KEY1               ((uint32_t)0x45670123)
77 
#define FLASH_KEY2               ((uint32_t)0xCDEF89AB)
78 
 
79 
/* Delay definition */
80 
#define EraseTimeout             ((uint32_t)0x00000FFF)
81 
#define ProgramTimeout           ((uint32_t)0x0000000F)
82 
 
83 
/**
84 
  * @}
85 
  */
86 
 
87 
/** @defgroup FLASH_Private_Macros
88 
  * @{
89 
  */
90 
 
91 
/**
92 
  * @}
93 
  */
94 
 
95 
/** @defgroup FLASH_Private_Variables
96 
  * @{
97 
  */
98 
 
99 
/**
100 
  * @}
101 
  */
102 
 
103 
/** @defgroup FLASH_Private_FunctionPrototypes
104 
  * @{
105 
  */
106 
 
107 
static void delay(void);
108 
/**
109 
  * @}
110 
  */
111 
 
112 
/** @defgroup FLASH_Private_Functions
113 
  * @{
114 
  */
115 
 
116 
/**
117 
  * @brief  Sets the code latency value.
118 
  * @param FLASH_Latency: specifies the FLASH Latency value.
119 
  *   This parameter can be one of the following values:
120 
  * @arg FLASH_Latency_0: FLASH Zero Latency cycle
121 
  * @arg FLASH_Latency_1: FLASH One Latency cycle
122 
  * @arg FLASH_Latency_2: FLASH Two Latency cycles
123 
  * @retval : None
124 
  */
125 
void FLASH_SetLatency(uint32_t FLASH_Latency)
126 
{
127 
  uint32_t tmpreg = 0;
128 
 
129 
  /* Check the parameters */
130 
  assert_param(IS_FLASH_LATENCY(FLASH_Latency));
131 
 
132 
  /* Read the ACR register */
133 
  tmpreg = FLASH->ACR;
134 
 
135 
  /* Sets the Latency value */
136 
  tmpreg &= ACR_LATENCY_Mask;
137 
  tmpreg |= FLASH_Latency;
138 
 
139 
  /* Write the ACR register */
140 
  FLASH->ACR = tmpreg;
141 
}
142 
 
143 
/**
144 
  * @brief  Enables or disables the Half cycle flash access.
145 
  * @param FLASH_HalfCycleAccess: specifies the FLASH Half cycle Access mode.
146 
  *   This parameter can be one of the following values:
147 
  * @arg FLASH_HalfCycleAccess_Enable: FLASH Half Cycle Enable
148 
  * @arg FLASH_HalfCycleAccess_Disable: FLASH Half Cycle Disable
149 
  * @retval : None
150 
  */
151 
void FLASH_HalfCycleAccessCmd(uint32_t FLASH_HalfCycleAccess)
152 
{
153 
  /* Check the parameters */
154 
  assert_param(IS_FLASH_HALFCYCLEACCESS_STATE(FLASH_HalfCycleAccess));
155 
 
156 
  /* Enable or disable the Half cycle access */
157 
  FLASH->ACR &= ACR_HLFCYA_Mask;
158 
  FLASH->ACR |= FLASH_HalfCycleAccess;
159 
}
160 
 
161 
/**
162 
  * @brief  Enables or disables the Prefetch Buffer.
163 
  * @param FLASH_PrefetchBuffer: specifies the Prefetch buffer status.
164 
  *   This parameter can be one of the following values:
165 
  * @arg FLASH_PrefetchBuffer_Enable: FLASH Prefetch Buffer Enable
166 
  * @arg FLASH_PrefetchBuffer_Disable: FLASH Prefetch Buffer Disable
167 
  * @retval : None
168 
  */
169 
void FLASH_PrefetchBufferCmd(uint32_t FLASH_PrefetchBuffer)
170 
{
171 
  /* Check the parameters */
172 
  assert_param(IS_FLASH_PREFETCHBUFFER_STATE(FLASH_PrefetchBuffer));
173 
 
174 
  /* Enable or disable the Prefetch Buffer */
175 
  FLASH->ACR &= ACR_PRFTBE_Mask;
176 
  FLASH->ACR |= FLASH_PrefetchBuffer;
177 
}
178 
 
179 
/**
180 
  * @brief  Unlocks the FLASH Program Erase Controller.
181 
  * @param  None
182 
  * @retval : None
183 
  */
184 
void FLASH_Unlock(void)
185 
{
186 
  /* Authorize the FPEC Access */
187 
  FLASH->KEYR = FLASH_KEY1;
188 
  FLASH->KEYR = FLASH_KEY2;
189 
}
190 
 
191 
/**
192 
  * @brief  Locks the FLASH Program Erase Controller.
193 
  * @param  None
194 
  * @retval : None
195 
  */
196 
void FLASH_Lock(void)
197 
{
198 
  /* Set the Lock Bit to lock the FPEC and the FCR */
199 
  FLASH->CR |= CR_LOCK_Set;
200 
}
201 
 
202 
/**
203 
  * @brief  Erases a specified FLASH page.
204 
  * @param Page_Address: The page address to be erased.
205 
  * @retval : FLASH Status: The returned value can be: FLASH_BUSY,
206 
  *   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
207 
  *   FLASH_TIMEOUT.
208 
  */
209 
FLASH_Status FLASH_ErasePage(uint32_t Page_Address)
210 
{
211 
  FLASH_Status status = FLASH_COMPLETE;
212 
  /* Check the parameters */
213 
  assert_param(IS_FLASH_ADDRESS(Page_Address));
214 
  /* Wait for last operation to be completed */
215 
  status = FLASH_WaitForLastOperation(EraseTimeout);
216 
 
217 
  if(status == FLASH_COMPLETE)
218 
  {
219 
    /* if the previous operation is completed, proceed to erase the page */
220 
    FLASH->CR|= CR_PER_Set;
221 
    FLASH->AR = Page_Address;
222 
    FLASH->CR|= CR_STRT_Set;
223 
 
224 
    /* Wait for last operation to be completed */
225 
    status = FLASH_WaitForLastOperation(EraseTimeout);
226 
    if(status != FLASH_BUSY)
227 
    {
228 
      /* if the erase operation is completed, disable the PER Bit */
229 
      FLASH->CR &= CR_PER_Reset;
230 
    }
231 
  }
232 
  /* Return the Erase Status */
233 
  return status;
234 
}
235 
 
236 
/**
237 
  * @brief  Erases all FLASH pages.
238 
  * @param  None
239 
  * @retval : FLASH Status: The returned value can be: FLASH_BUSY,
240 
  *   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
241 
  *   FLASH_TIMEOUT.
242 
  */
243 
FLASH_Status FLASH_EraseAllPages(void)
244 
{
245 
  FLASH_Status status = FLASH_COMPLETE;
246 
  /* Wait for last operation to be completed */
247 
  status = FLASH_WaitForLastOperation(EraseTimeout);
248 
 
249 
  if(status == FLASH_COMPLETE)
250 
  {
251 
    /* if the previous operation is completed, proceed to erase all pages */
252 
     FLASH->CR |= CR_MER_Set;
253 
     FLASH->CR |= CR_STRT_Set;
254 
 
255 
    /* Wait for last operation to be completed */
256 
    status = FLASH_WaitForLastOperation(EraseTimeout);
257 
    if(status != FLASH_BUSY)
258 
    {
259 
      /* if the erase operation is completed, disable the MER Bit */
260 
      FLASH->CR &= CR_MER_Reset;
261 
    }
262 
  }
263 
  /* Return the Erase Status */
264 
  return status;
265 
}
266 
 
267 
/**
268 
  * @brief  Erases the FLASH option bytes.
269 
  * @param  None
270 
  * @retval : FLASH Status: The returned value can be: FLASH_BUSY,
271 
  *   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
272 
  *   FLASH_TIMEOUT.
273 
  */
274 
FLASH_Status FLASH_EraseOptionBytes(void)
275 
{
276 
  FLASH_Status status = FLASH_COMPLETE;
277 
 
278 
  /* Wait for last operation to be completed */
279 
  status = FLASH_WaitForLastOperation(EraseTimeout);
280 
  if(status == FLASH_COMPLETE)
281 
  {
282 
    /* Authorize the small information block programming */
283 
    FLASH->OPTKEYR = FLASH_KEY1;
284 
    FLASH->OPTKEYR = FLASH_KEY2;
285 
 
286 
    /* if the previous operation is completed, proceed to erase the option bytes */
287 
    FLASH->CR |= CR_OPTER_Set;
288 
    FLASH->CR |= CR_STRT_Set;
289 
    /* Wait for last operation to be completed */
290 
    status = FLASH_WaitForLastOperation(EraseTimeout);
291 
 
292 
    if(status == FLASH_COMPLETE)
293 
    {
294 
      /* if the erase operation is completed, disable the OPTER Bit */
295 
      FLASH->CR &= CR_OPTER_Reset;
296 
 
297 
      /* Enable the Option Bytes Programming operation */
298 
      FLASH->CR |= CR_OPTPG_Set;
299 
      /* Enable the readout access */
300 
      OB->RDP= RDP_Key;
301 
      /* Wait for last operation to be completed */
302 
      status = FLASH_WaitForLastOperation(ProgramTimeout);
303 
 
304 
      if(status != FLASH_BUSY)
305 
      {
306 
        /* if the program operation is completed, disable the OPTPG Bit */
307 
        FLASH->CR &= CR_OPTPG_Reset;
308 
      }
309 
    }
310 
    else
311 
    {
312 
      if (status != FLASH_BUSY)
313 
      {
314 
        /* Disable the OPTPG Bit */
315 
        FLASH->CR &= CR_OPTPG_Reset;
316 
      }
317 
    }
318 
  }
319 
  /* Return the erase status */
320 
  return status;
321 
}
322 
 
323 
/**
324 
  * @brief  Programs a word at a specified address.
325 
  * @param Address: specifies the address to be programmed.
326 
  * @param Data: specifies the data to be programmed.
327 
  * @retval : FLASH Status: The returned value can be: FLASH_BUSY,
328 
  *   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
329 
  *   FLASH_TIMEOUT.
330 
  */
331 
FLASH_Status FLASH_ProgramWord(uint32_t Address, uint32_t Data)
332 
{
333 
  FLASH_Status status = FLASH_COMPLETE;
334 
  /* Check the parameters */
335 
  assert_param(IS_FLASH_ADDRESS(Address));
336 
  /* Wait for last operation to be completed */
337 
  status = FLASH_WaitForLastOperation(ProgramTimeout);
338 
 
339 
  if(status == FLASH_COMPLETE)
340 
  {
341 
    /* if the previous operation is completed, proceed to program the new first
342 
    half word */
343 
    FLASH->CR |= CR_PG_Set;
344 
 
345 
    *(__IO uint16_t*)Address = (uint16_t)Data;
346 
    /* Wait for last operation to be completed */
347 
    status = FLASH_WaitForLastOperation(ProgramTimeout);
348 
 
349 
    if(status == FLASH_COMPLETE)
350 
    {
351 
      /* if the previous operation is completed, proceed to program the new second
352 
      half word */
353 
      *(__IO uint16_t*)(Address + 2) = Data >> 16;
354 
 
355 
      /* Wait for last operation to be completed */
356 
      status = FLASH_WaitForLastOperation(ProgramTimeout);
357 
 
358 
      if(status != FLASH_BUSY)
359 
      {
360 
        /* Disable the PG Bit */
361 
        FLASH->CR &= CR_PG_Reset;
362 
      }
363 
    }
364 
    else
365 
    {
366 
      if (status != FLASH_BUSY)
367 
      {
368 
        /* Disable the PG Bit */
369 
        FLASH->CR &= CR_PG_Reset;
370 
      }
371 
     }
372 
  }
373 
  /* Return the Program Status */
374 
  return status;
375 
}
376 
 
377 
/**
378 
  * @brief  Programs a half word at a specified address.
379 
  * @param Address: specifies the address to be programmed.
380 
  * @param Data: specifies the data to be programmed.
381 
  * @retval : FLASH Status: The returned value can be: FLASH_BUSY,
382 
  *   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
383 
  *   FLASH_TIMEOUT.
384 
  */
385 
FLASH_Status FLASH_ProgramHalfWord(uint32_t Address, uint16_t Data)
386 
{
387 
  FLASH_Status status = FLASH_COMPLETE;
388 
  /* Check the parameters */
389 
  assert_param(IS_FLASH_ADDRESS(Address));
390 
  /* Wait for last operation to be completed */
391 
  status = FLASH_WaitForLastOperation(ProgramTimeout);
392 
 
393 
  if(status == FLASH_COMPLETE)
394 
  {
395 
    /* if the previous operation is completed, proceed to program the new data */
396 
    FLASH->CR |= CR_PG_Set;
397 
 
398 
    *(__IO uint16_t*)Address = Data;
399 
    /* Wait for last operation to be completed */
400 
    status = FLASH_WaitForLastOperation(ProgramTimeout);
401 
    if(status != FLASH_BUSY)
402 
    {
403 
      /* if the program operation is completed, disable the PG Bit */
404 
      FLASH->CR &= CR_PG_Reset;
405 
    }
406 
  }
407 
  /* Return the Program Status */
408 
  return status;
409 
}
410 
 
411 
/**
412 
  * @brief  Programs a half word at a specified Option Byte Data address.
413 
  * @param Address: specifies the address to be programmed.
414 
  *   This parameter can be 0x1FFFF804 or 0x1FFFF806.
415 
  * @param Data: specifies the data to be programmed.
416 
  * @retval : FLASH Status: The returned value can be: FLASH_BUSY,
417 
  *   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
418 
  *   FLASH_TIMEOUT.
419 
  */
420 
FLASH_Status FLASH_ProgramOptionByteData(uint32_t Address, uint8_t Data)
421 
{
422 
  FLASH_Status status = FLASH_COMPLETE;
423 
  /* Check the parameters */
424 
  assert_param(IS_OB_DATA_ADDRESS(Address));
425 
  status = FLASH_WaitForLastOperation(ProgramTimeout);
426 
  if(status == FLASH_COMPLETE)
427 
  {
428 
    /* Authorize the small information block programming */
429 
    FLASH->OPTKEYR = FLASH_KEY1;
430 
    FLASH->OPTKEYR = FLASH_KEY2;
431 
    /* Enables the Option Bytes Programming operation */
432 
    FLASH->CR |= CR_OPTPG_Set;
433 
    *(__IO uint16_t*)Address = Data;
434 
 
435 
    /* Wait for last operation to be completed */
436 
    status = FLASH_WaitForLastOperation(ProgramTimeout);
437 
    if(status != FLASH_BUSY)
438 
    {
439 
      /* if the program operation is completed, disable the OPTPG Bit */
440 
      FLASH->CR &= CR_OPTPG_Reset;
441 
    }
442 
  }
443 
  /* Return the Option Byte Data Program Status */
444 
  return status;
445 
}
446 
 
447 
/**
448 
  * @brief  Write protects the desired pages
449 
  * @param FLASH_Pages: specifies the address of the pages to be
450 
  *   write protected. This parameter can be:
451 
  * @arg For STM32F10Xxx Medium-density devices (FLASH page size equal to 1 KB)
452 
  * A value between FLASH_WRProt_Pages0to3 and FLASH_WRProt_Pages124to127
453 
  * @arg For STM32F10Xxx High-density devices (FLASH page size equal to 2 KB)
454 
  * A value between FLASH_WRProt_Pages0to1 and  FLASH_WRProt_Pages60to61
455 
  * or FLASH_WRProt_Pages62to255
456 
  * @arg FLASH_WRProt_AllPages
457 
  * @retval : FLASH Status: The returned value can be: FLASH_BUSY,
458 
  *   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
459 
  *   FLASH_TIMEOUT.
460 
  */
461 
FLASH_Status FLASH_EnableWriteProtection(uint32_t FLASH_Pages)
462 
{
463 
  uint16_t WRP0_Data = 0xFFFF, WRP1_Data = 0xFFFF, WRP2_Data = 0xFFFF, WRP3_Data = 0xFFFF;
464 
 
465 
  FLASH_Status status = FLASH_COMPLETE;
466 
 
467 
  /* Check the parameters */
468 
  assert_param(IS_FLASH_WRPROT_PAGE(FLASH_Pages));
469 
 
470 
  FLASH_Pages = (uint32_t)(~FLASH_Pages);
471 
  WRP0_Data = (uint16_t)(FLASH_Pages & WRP0_Mask);
472 
  WRP1_Data = (uint16_t)((FLASH_Pages & WRP1_Mask) >> 8);
473 
  WRP2_Data = (uint16_t)((FLASH_Pages & WRP2_Mask) >> 16);
474 
  WRP3_Data = (uint16_t)((FLASH_Pages & WRP3_Mask) >> 24);
475 
 
476 
  /* Wait for last operation to be completed */
477 
  status = FLASH_WaitForLastOperation(ProgramTimeout);
478 
 
479 
  if(status == FLASH_COMPLETE)
480 
  {
481 
    /* Authorizes the small information block programming */
482 
    FLASH->OPTKEYR = FLASH_KEY1;
483 
    FLASH->OPTKEYR = FLASH_KEY2;
484 
    FLASH->CR |= CR_OPTPG_Set;
485 
    if(WRP0_Data != 0xFF)
486 
    {
487 
      OB->WRP0 = WRP0_Data;
488 
 
489 
      /* Wait for last operation to be completed */
490 
      status = FLASH_WaitForLastOperation(ProgramTimeout);
491 
    }
492 
    if((status == FLASH_COMPLETE) && (WRP1_Data != 0xFF))
493 
    {
494 
      OB->WRP1 = WRP1_Data;
495 
 
496 
      /* Wait for last operation to be completed */
497 
      status = FLASH_WaitForLastOperation(ProgramTimeout);
498 
    }
499 
    if((status == FLASH_COMPLETE) && (WRP2_Data != 0xFF))
500 
    {
501 
      OB->WRP2 = WRP2_Data;
502 
 
503 
      /* Wait for last operation to be completed */
504 
      status = FLASH_WaitForLastOperation(ProgramTimeout);
505 
    }
506 
 
507 
    if((status == FLASH_COMPLETE)&& (WRP3_Data != 0xFF))
508 
    {
509 
      OB->WRP3 = WRP3_Data;
510 
 
511 
      /* Wait for last operation to be completed */
512 
      status = FLASH_WaitForLastOperation(ProgramTimeout);
513 
    }
514 
 
515 
    if(status != FLASH_BUSY)
516 
    {
517 
      /* if the program operation is completed, disable the OPTPG Bit */
518 
      FLASH->CR &= CR_OPTPG_Reset;
519 
    }
520 
  }
521 
  /* Return the write protection operation Status */
522 
  return status;
523 
}
524 
 
525 
/**
526 
  * @brief  Enables or disables the read out protection.
527 
  *   If the user has already programmed the other option bytes before
528 
  *   calling this function, he must re-program them since this
529 
  *   function erases all option bytes.
530 
  * @param Newstate: new state of the ReadOut Protection.
531 
  *   This parameter can be: ENABLE or DISABLE.
532 
  * @retval : FLASH Status: The returned value can be: FLASH_BUSY,
533 
  *   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
534 
  *   FLASH_TIMEOUT.
535 
  */
536 
FLASH_Status FLASH_ReadOutProtection(FunctionalState NewState)
537 
{
538 
  FLASH_Status status = FLASH_COMPLETE;
539 
  /* Check the parameters */
540 
  assert_param(IS_FUNCTIONAL_STATE(NewState));
541 
  status = FLASH_WaitForLastOperation(EraseTimeout);
542 
  if(status == FLASH_COMPLETE)
543 
  {
544 
    /* Authorizes the small information block programming */
545 
    FLASH->OPTKEYR = FLASH_KEY1;
546 
    FLASH->OPTKEYR = FLASH_KEY2;
547 
    FLASH->CR |= CR_OPTER_Set;
548 
    FLASH->CR |= CR_STRT_Set;
549 
    /* Wait for last operation to be completed */
550 
    status = FLASH_WaitForLastOperation(EraseTimeout);
551 
    if(status == FLASH_COMPLETE)
552 
    {
553 
      /* if the erase operation is completed, disable the OPTER Bit */
554 
      FLASH->CR &= CR_OPTER_Reset;
555 
      /* Enable the Option Bytes Programming operation */
556 
      FLASH->CR |= CR_OPTPG_Set;
557 
      if(NewState != DISABLE)
558 
      {
559 
        OB->RDP = 0x00;
560 
      }
561 
      else
562 
      {
563 
        OB->RDP = RDP_Key;
564 
      }
565 
      /* Wait for last operation to be completed */
566 
      status = FLASH_WaitForLastOperation(EraseTimeout);
567 
 
568 
      if(status != FLASH_BUSY)
569 
      {
570 
        /* if the program operation is completed, disable the OPTPG Bit */
571 
        FLASH->CR &= CR_OPTPG_Reset;
572 
      }
573 
    }
574 
    else
575 
    {
576 
      if(status != FLASH_BUSY)
577 
      {
578 
        /* Disable the OPTER Bit */
579 
        FLASH->CR &= CR_OPTER_Reset;
580 
      }
581 
    }
582 
  }
583 
  /* Return the protection operation Status */
584 
  return status;
585 
}
586 
 
587 
/**
588 
  * @brief  Programs the FLASH User Option Byte: IWDG_SW / RST_STOP /
589 
  *   RST_STDBY.
590 
  * @param OB_IWDG: Selects the IWDG mode
591 
  *   This parameter can be one of the following values:
592 
  * @arg OB_IWDG_SW: Software IWDG selected
593 
  * @arg OB_IWDG_HW: Hardware IWDG selected
594 
  * @param OB_STOP: Reset event when entering STOP mode.
595 
  *   This parameter can be one of the following values:
596 
  * @arg OB_STOP_NoRST: No reset generated when entering in STOP
597 
  * @arg OB_STOP_RST: Reset generated when entering in STOP
598 
  * @param OB_STDBY: Reset event when entering Standby mode.
599 
  *   This parameter can be one of the following values:
600 
  * @arg OB_STDBY_NoRST: No reset generated when entering in STANDBY
601 
  * @arg OB_STDBY_RST: Reset generated when entering in STANDBY
602 
  * @retval : FLASH Status: The returned value can be: FLASH_BUSY,
603 
  *   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
604 
  *   FLASH_TIMEOUT.
605 
  */
606 
FLASH_Status FLASH_UserOptionByteConfig(uint16_t OB_IWDG, uint16_t OB_STOP, uint16_t OB_STDBY)
607 
{
608 
  FLASH_Status status = FLASH_COMPLETE;
609 
  /* Check the parameters */
610 
  assert_param(IS_OB_IWDG_SOURCE(OB_IWDG));
611 
  assert_param(IS_OB_STOP_SOURCE(OB_STOP));
612 
  assert_param(IS_OB_STDBY_SOURCE(OB_STDBY));
613 
  /* Authorize the small information block programming */
614 
  FLASH->OPTKEYR = FLASH_KEY1;
615 
  FLASH->OPTKEYR = FLASH_KEY2;
616 
 
617 
  /* Wait for last operation to be completed */
618 
  status = FLASH_WaitForLastOperation(ProgramTimeout);
619 
 
620 
  if(status == FLASH_COMPLETE)
621 
  {
622 
    /* Enable the Option Bytes Programming operation */
623 
    FLASH->CR |= CR_OPTPG_Set;
624 
 
625 
    OB->USER = ( OB_IWDG | OB_STOP |OB_STDBY) | (uint16_t)0xF8;
626 
 
627 
    /* Wait for last operation to be completed */
628 
    status = FLASH_WaitForLastOperation(ProgramTimeout);
629 
    if(status != FLASH_BUSY)
630 
    {
631 
      /* if the program operation is completed, disable the OPTPG Bit */
632 
      FLASH->CR &= CR_OPTPG_Reset;
633 
    }
634 
  }
635 
  /* Return the Option Byte program Status */
636 
  return status;
637 
}
638 
 
639 
/**
640 
  * @brief  Returns the FLASH User Option Bytes values.
641 
  * @param  None
642 
  * @retval : The FLASH User Option Bytes values:IWDG_SW(Bit0), RST_STOP(Bit1)
643 
  *   and RST_STDBY(Bit2).
644 
  */
645 
uint32_t FLASH_GetUserOptionByte(void)
646 
{
647 
  /* Return the User Option Byte */
648 
  return (uint32_t)(FLASH->OBR >> 2);
649 
}
650 
 
651 
/**
652 
  * @brief  Returns the FLASH Write Protection Option Bytes Register value.
653 
  * @param  None
654 
  * @retval : The FLASH Write Protection  Option Bytes Register value
655 
  */
656 
uint32_t FLASH_GetWriteProtectionOptionByte(void)
657 
{
658 
  /* Return the Falsh write protection Register value */
659 
  return (uint32_t)(FLASH->WRPR);
660 
}
661 
 
662 
/**
663 
  * @brief  Checks whether the FLASH Read Out Protection Status is set
664 
  *   or not.
665 
  * @param  None
666 
  * @retval : FLASH ReadOut Protection Status(SET or RESET)
667 
  */
668 
FlagStatus FLASH_GetReadOutProtectionStatus(void)
669 
{
670 
  FlagStatus readoutstatus = RESET;
671 
  if ((FLASH->OBR & RDPRT_Mask) != (uint32_t)RESET)
672 
  {
673 
    readoutstatus = SET;
674 
  }
675 
  else
676 
  {
677 
    readoutstatus = RESET;
678 
  }
679 
  return readoutstatus;
680 
}
681 
 
682 
/**
683 
  * @brief  Checks whether the FLASH Prefetch Buffer status is set or not.
684 
  * @param  None
685 
  * @retval : FLASH Prefetch Buffer Status (SET or RESET).
686 
  */
687 
FlagStatus FLASH_GetPrefetchBufferStatus(void)
688 
{
689 
  FlagStatus bitstatus = RESET;
690 
 
691 
  if ((FLASH->ACR & ACR_PRFTBS_Mask) != (uint32_t)RESET)
692 
  {
693 
    bitstatus = SET;
694 
  }
695 
  else
696 
  {
697 
    bitstatus = RESET;
698 
  }
699 
  /* Return the new state of FLASH Prefetch Buffer Status (SET or RESET) */
700 
  return bitstatus;
701 
}
702 
 
703 
/**
704 
  * @brief  Enables or disables the specified FLASH interrupts.
705 
  * @param FLASH_IT: specifies the FLASH interrupt sources to be
706 
  *   enabled or disabled.
707 
  *   This parameter can be any combination of the following values:
708 
  * @arg FLASH_IT_ERROR: FLASH Error Interrupt
709 
  * @arg FLASH_IT_EOP: FLASH end of operation Interrupt
710 
  * @param NewState: new state of the specified Flash interrupts.
711 
  *   This parameter can be: ENABLE or DISABLE.
712 
  * @retval : None
713 
  */
714 
void FLASH_ITConfig(uint16_t FLASH_IT, FunctionalState NewState)
715 
{
716 
  /* Check the parameters */
717 
  assert_param(IS_FLASH_IT(FLASH_IT));
718 
  assert_param(IS_FUNCTIONAL_STATE(NewState));
719 
  if(NewState != DISABLE)
720 
  {
721 
    /* Enable the interrupt sources */
722 
    FLASH->CR |= FLASH_IT;
723 
  }
724 
  else
725 
  {
726 
    /* Disable the interrupt sources */
727 
    FLASH->CR &= ~(uint32_t)FLASH_IT;
728 
  }
729 
}
730 
 
731 
/**
732 
  * @brief  Checks whether the specified FLASH flag is set or not.
733 
  * @param FLASH_FLAG: specifies the FLASH flag to check.
734 
  *   This parameter can be one of the following values:
735 
  * @arg FLASH_FLAG_BSY: FLASH Busy flag
736 
  * @arg FLASH_FLAG_PGERR: FLASH Program error flag
737 
  * @arg FLASH_FLAG_WRPRTERR: FLASH Write protected error flag
738 
  * @arg FLASH_FLAG_EOP: FLASH End of Operation flag
739 
  * @arg FLASH_FLAG_OPTERR:  FLASH Option Byte error flag
740 
  * @retval : The new state of FLASH_FLAG (SET or RESET).
741 
  */
742 
FlagStatus FLASH_GetFlagStatus(uint16_t FLASH_FLAG)
743 
{
744 
  FlagStatus bitstatus = RESET;
745 
  /* Check the parameters */
746 
  assert_param(IS_FLASH_GET_FLAG(FLASH_FLAG)) ;
747 
  if(FLASH_FLAG == FLASH_FLAG_OPTERR)
748 
  {
749 
    if((FLASH->OBR & FLASH_FLAG_OPTERR) != (uint32_t)RESET)
750 
    {
751 
      bitstatus = SET;
752 
    }
753 
    else
754 
    {
755 
      bitstatus = RESET;
756 
    }
757 
  }
758 
  else
759 
  {
760 
   if((FLASH->SR & FLASH_FLAG) != (uint32_t)RESET)
761 
    {
762 
      bitstatus = SET;
763 
    }
764 
    else
765 
    {
766 
      bitstatus = RESET;
767 
    }
768 
  }
769 
  /* Return the new state of FLASH_FLAG (SET or RESET) */
770 
  return bitstatus;
771 
}
772 
 
773 
/**
774 
  * @brief  Clears the FLASH’s pending flags.
775 
  * @param FLASH_FLAG: specifies the FLASH flags to clear.
776 
  *   This parameter can be any combination of the following values:
777 
  * @arg FLASH_FLAG_BSY: FLASH Busy flag
778 
  * @arg FLASH_FLAG_PGERR: FLASH Program error flag
779 
  * @arg FLASH_FLAG_WRPRTERR: FLASH Write protected error flag
780 
  * @arg FLASH_FLAG_EOP: FLASH End of Operation flag
781 
  * @retval : None
782 
  */
783 
void FLASH_ClearFlag(uint16_t FLASH_FLAG)
784 
{
785 
  /* Check the parameters */
786 
  assert_param(IS_FLASH_CLEAR_FLAG(FLASH_FLAG)) ;
787 
 
788 
  /* Clear the flags */
789 
  FLASH->SR = FLASH_FLAG;
790 
}
791 
 
792 
/**
793 
  * @brief  Returns the FLASH Status.
794 
  * @param  None
795 
  * @retval : FLASH Status: The returned value can be: FLASH_BUSY,
796 
  *   FLASH_ERROR_PG, FLASH_ERROR_WRP or FLASH_COMPLETE
797 
  */
798 
FLASH_Status FLASH_GetStatus(void)
799 
{
800 
  FLASH_Status flashstatus = FLASH_COMPLETE;
801 
 
802 
  if((FLASH->SR & FLASH_FLAG_BSY) == FLASH_FLAG_BSY)
803 
  {
804 
    flashstatus = FLASH_BUSY;
805 
  }
806 
  else
807 
  {
808 
    if(FLASH->SR & FLASH_FLAG_PGERR)
809 
    {
810 
      flashstatus = FLASH_ERROR_PG;
811 
    }
812 
    else
813 
    {
814 
      if(FLASH->SR & FLASH_FLAG_WRPRTERR)
815 
      {
816 
        flashstatus = FLASH_ERROR_WRP;
817 
      }
818 
      else
819 
      {
820 
        flashstatus = FLASH_COMPLETE;
821 
      }
822 
    }
823 
  }
824 
  /* Return the Flash Status */
825 
  return flashstatus;
826 
}
827 
 
828 
/**
829 
  * @brief  Waits for a Flash operation to complete or a TIMEOUT to occur.
830 
  * @param Timeout: FLASH progamming Timeout
831 
  * @retval : FLASH Status: The returned value can be: FLASH_BUSY,
832 
  *   FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or
833 
  *   FLASH_TIMEOUT.
834 
  */
835 
FLASH_Status FLASH_WaitForLastOperation(uint32_t Timeout)
836 
{
837 
  FLASH_Status status = FLASH_COMPLETE;
838 
 
839 
  /* Check for the Flash Status */
840 
  status = FLASH_GetStatus();
841 
  /* Wait for a Flash operation to complete or a TIMEOUT to occur */
842 
  while((status == FLASH_BUSY) && (Timeout != 0x00))
843 
  {
844 
    delay();
845 
    status = FLASH_GetStatus();
846 
    Timeout--;
847 
  }
848 
  if(Timeout == 0x00 )
849 
  {
850 
    status = FLASH_TIMEOUT;
851 
  }
852 
  /* Return the operation status */
853 
  return status;
854 
}
855 
 
856 
/**
857 
  * @brief  Inserts a time delay.
858 
  * @param  None
859 
  * @retval : None
860 
  */
861 
static void delay(void)
862 
{
863 
  __IO uint32_t i = 0;
864 
  for(i = 0xFF; i != 0; i--)
865 
  {
866 
  }
867 
}
868 
 
869 
/**
870 
  * @}
871 
  */
872 
 
873 
/**
874 
  * @}
875 
  */
876 
 
877 
/**
878 
  * @}
879 
  */
880 
 
881 
/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/

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