Boot Linux faster!

Check our new training course

Boot Linux faster!

Check our new training course
and Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

  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
/**
  ******************************************************************************
  * @file    stm32f7xx_hal_pwr.c
  * @author  MCD Application Team
  * @brief   PWR HAL module driver.
  *          This file provides firmware functions to manage the following 
  *          functionalities of the Power Controller (PWR) peripheral:
  *           + Initialization and de-initialization functions
  *           + Peripheral Control functions 
  *         
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32f7xx_hal.h"

/** @addtogroup STM32F7xx_HAL_Driver
  * @{
  */

/** @defgroup PWR PWR
  * @brief PWR HAL module driver
  * @{
  */

#ifdef HAL_PWR_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/** @addtogroup PWR_Private_Constants
  * @{
  */
	
/** @defgroup PWR_PVD_Mode_Mask PWR PVD Mode Mask
  * @{
  */     
#define PVD_MODE_IT               ((uint32_t)0x00010000U)
#define PVD_MODE_EVT              ((uint32_t)0x00020000U)
#define PVD_RISING_EDGE           ((uint32_t)0x00000001U)
#define PVD_FALLING_EDGE          ((uint32_t)0x00000002U)
/**
  * @}
  */

/** @defgroup PWR_ENABLE_WUP_Mask PWR Enable WUP Mask
  * @{
  */  
#define  PWR_EWUP_MASK                          ((uint32_t)0x00003F00)
/**
  * @}
  */

/**
  * @}
  */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @defgroup PWR_Exported_Functions PWR Exported Functions
  * @{
  */

/** @defgroup PWR_Exported_Functions_Group1 Initialization and de-initialization functions 
  *  @brief    Initialization and de-initialization functions
  *
@verbatim
 ===============================================================================
              ##### Initialization and de-initialization functions #####
 ===============================================================================
    [..]
      After reset, the backup domain (RTC registers, RTC backup data 
      registers and backup SRAM) is protected against possible unwanted 
      write accesses. 
      To enable access to the RTC Domain and RTC registers, proceed as follows:
        (+) Enable the Power Controller (PWR) APB1 interface clock using the
            __HAL_RCC_PWR_CLK_ENABLE() macro.
        (+) Enable access to RTC domain using the HAL_PWR_EnableBkUpAccess() function.
 
@endverbatim
  * @{
  */

/**
  * @brief Deinitializes the HAL PWR peripheral registers to their default reset values.
  * @retval None
  */
void HAL_PWR_DeInit(void)
{
  __HAL_RCC_PWR_FORCE_RESET();
  __HAL_RCC_PWR_RELEASE_RESET();
}

/**
  * @brief Enables access to the backup domain (RTC registers, RTC 
  *         backup data registers and backup SRAM).
  * @note If the HSE divided by 2, 3, ..31 is used as the RTC clock, the 
  *         Backup Domain Access should be kept enabled.
  * @retval None
  */
void HAL_PWR_EnableBkUpAccess(void)
{
  /* Enable access to RTC and backup registers */
  SET_BIT(PWR->CR1, PWR_CR1_DBP);
}

/**
  * @brief Disables access to the backup domain (RTC registers, RTC 
  *         backup data registers and backup SRAM).
  * @note If the HSE divided by 2, 3, ..31 is used as the RTC clock, the 
  *         Backup Domain Access should be kept enabled.
  * @retval None
  */
void HAL_PWR_DisableBkUpAccess(void)
{
  /* Disable access to RTC and backup registers */
	CLEAR_BIT(PWR->CR1, PWR_CR1_DBP);
}

/**
  * @}
  */

/** @defgroup PWR_Exported_Functions_Group2 Peripheral Control functions 
  *  @brief Low Power modes configuration functions 
  *
@verbatim

 ===============================================================================
                 ##### Peripheral Control functions #####
 ===============================================================================
     
    *** PVD configuration ***
    =========================
    [..]
      (+) The PVD is used to monitor the VDD power supply by comparing it to a 
          threshold selected by the PVD Level (PLS[2:0] bits in the PWR_CR).
      (+) A PVDO flag is available to indicate if VDD/VDDA is higher or lower 
          than the PVD threshold. This event is internally connected to the EXTI 
          line16 and can generate an interrupt if enabled. This is done through
          __HAL_PWR_PVD_EXTI_ENABLE_IT() macro.
      (+) The PVD is stopped in Standby mode.

    *** Wake-up pin configuration ***
    ================================
    [..]
      (+) Wake-up pin is used to wake up the system from Standby mode. This pin is 
          forced in input pull-down configuration and is active on rising edges.
      (+) There are up to 6 Wake-up pin in the STM32F7 devices family

    *** Low Power modes configuration ***
    =====================================
    [..]
      The devices feature 3 low-power modes:
      (+) Sleep mode: Cortex-M7 core stopped, peripherals kept running.
      (+) Stop mode: all clocks are stopped, regulator running, regulator 
          in low power mode
      (+) Standby mode: 1.2V domain powered off.
   
   *** Sleep mode ***
   ==================
    [..]
      (+) Entry:
        The Sleep mode is entered by using the HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI)
              functions with
          (++) PWR_SLEEPENTRY_WFI: enter SLEEP mode with WFI instruction
          (++) PWR_SLEEPENTRY_WFE: enter SLEEP mode with WFE instruction
      
      -@@- The Regulator parameter is not used for the STM32F7 family 
              and is kept as parameter just to maintain compatibility with the 
              lower power families (STM32L).
      (+) Exit:
        Any peripheral interrupt acknowledged by the nested vectored interrupt 
              controller (NVIC) can wake up the device from Sleep mode.

   *** Stop mode ***
   =================
    [..]
      In Stop mode, all clocks in the 1.2V domain are stopped, the PLL, the HSI,
      and the HSE RC oscillators are disabled. Internal SRAM and register contents 
      are preserved.
      The voltage regulator can be configured either in normal or low-power mode.
      To minimize the consumption In Stop mode, FLASH can be powered off before 
      entering the Stop mode using the HAL_PWREx_EnableFlashPowerDown() function.
      It can be switched on again by software after exiting the Stop mode using
      the HAL_PWREx_DisableFlashPowerDown() function. 

      (+) Entry:
         The Stop mode is entered using the HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON) 
             function with:
          (++) Main regulator ON.
          (++) Low Power regulator ON.
      (+) Exit:
        Any EXTI Line (Internal or External) configured in Interrupt/Event mode.

   *** Standby mode ***
   ====================
    [..]
    (+)
      The Standby mode allows to achieve the lowest power consumption. It is based 
      on the Cortex-M7 deep sleep mode, with the voltage regulator disabled. 
      The 1.2V domain is consequently powered off. The PLL, the HSI oscillator and 
      the HSE oscillator are also switched off. SRAM and register contents are lost 
      except for the RTC registers, RTC backup registers, backup SRAM and Standby 
      circuitry.
   
      The voltage regulator is OFF.
      
      (++) Entry:
        (+++) The Standby mode is entered using the HAL_PWR_EnterSTANDBYMode() function.
      (++) Exit:
        (+++) WKUP pin rising or falling edge, RTC alarm (Alarm A and Alarm B), RTC
             wakeup, tamper event, time stamp event, external reset in NRST pin, IWDG reset.

   *** Auto-wakeup (AWU) from low-power mode ***
   =============================================
    [..]
    
     (+) The MCU can be woken up from low-power mode by an RTC Alarm event, an RTC 
      Wakeup event, a tamper event or a time-stamp event, without depending on 
      an external interrupt (Auto-wakeup mode).

      (+) RTC auto-wakeup (AWU) from the Stop and Standby modes
       
        (++) To wake up from the Stop mode with an RTC alarm event, it is necessary to 
              configure the RTC to generate the RTC alarm using the HAL_RTC_SetAlarm_IT() function.

        (++) To wake up from the Stop mode with an RTC Tamper or time stamp event, it 
             is necessary to configure the RTC to detect the tamper or time stamp event using the
                HAL_RTCEx_SetTimeStamp_IT() or HAL_RTCEx_SetTamper_IT() functions.
                  
        (++) To wake up from the Stop mode with an RTC WakeUp event, it is necessary to
              configure the RTC to generate the RTC WakeUp event using the HAL_RTCEx_SetWakeUpTimer_IT() function.

@endverbatim
  * @{
  */

/**
  * @brief Configures the voltage threshold detected by the Power Voltage Detector(PVD).
  * @param sConfigPVD: pointer to an PWR_PVDTypeDef structure that contains the configuration
  *        information for the PVD.
  * @note Refer to the electrical characteristics of your device datasheet for
  *         more details about the voltage threshold corresponding to each 
  *         detection level.
  * @retval None
  */
void HAL_PWR_ConfigPVD(PWR_PVDTypeDef *sConfigPVD)
{
  /* Check the parameters */
  assert_param(IS_PWR_PVD_LEVEL(sConfigPVD->PVDLevel));
  assert_param(IS_PWR_PVD_MODE(sConfigPVD->Mode));
  
  /* Set PLS[7:5] bits according to PVDLevel value */
  MODIFY_REG(PWR->CR1, PWR_CR1_PLS, sConfigPVD->PVDLevel);
  
  /* Clear any previous config. Keep it clear if no event or IT mode is selected */
  __HAL_PWR_PVD_EXTI_DISABLE_EVENT();
  __HAL_PWR_PVD_EXTI_DISABLE_IT();
  __HAL_PWR_PVD_EXTI_DISABLE_RISING_EDGE();
  __HAL_PWR_PVD_EXTI_DISABLE_FALLING_EDGE(); 

  /* Configure interrupt mode */
  if((sConfigPVD->Mode & PVD_MODE_IT) == PVD_MODE_IT)
  {
    __HAL_PWR_PVD_EXTI_ENABLE_IT();
  }
  
  /* Configure event mode */
  if((sConfigPVD->Mode & PVD_MODE_EVT) == PVD_MODE_EVT)
  {
    __HAL_PWR_PVD_EXTI_ENABLE_EVENT();
  }
  
  /* Configure the edge */
  if((sConfigPVD->Mode & PVD_RISING_EDGE) == PVD_RISING_EDGE)
  {
    __HAL_PWR_PVD_EXTI_ENABLE_RISING_EDGE();
  }
  
  if((sConfigPVD->Mode & PVD_FALLING_EDGE) == PVD_FALLING_EDGE)
  {
    __HAL_PWR_PVD_EXTI_ENABLE_FALLING_EDGE();
  }
}

/**
  * @brief Enables the Power Voltage Detector(PVD).
  * @retval None
  */
void HAL_PWR_EnablePVD(void)
{
  /* Enable the power voltage detector */
	SET_BIT(PWR->CR1, PWR_CR1_PVDE);
}

/**
  * @brief Disables the Power Voltage Detector(PVD).
  * @retval None
  */
void HAL_PWR_DisablePVD(void)
{
  /* Disable the power voltage detector */
	CLEAR_BIT(PWR->CR1, PWR_CR1_PVDE);
}

/**
  * @brief Enable the WakeUp PINx functionality.
  * @param WakeUpPinPolarity: Specifies which Wake-Up pin to enable.
  *         This parameter can be one of the following legacy values, which sets the default polarity: 
  *         detection on high level (rising edge):
  *           @arg PWR_WAKEUP_PIN1, PWR_WAKEUP_PIN2, PWR_WAKEUP_PIN3, PWR_WAKEUP_PIN4, PWR_WAKEUP_PIN5, PWR_WAKEUP_PIN6 
  *         or one of the following value where the user can explicitly states the enabled pin and
  *         the chosen polarity  
  *           @arg PWR_WAKEUP_PIN1_HIGH or PWR_WAKEUP_PIN1_LOW 
  *           @arg PWR_WAKEUP_PIN2_HIGH or PWR_WAKEUP_PIN2_LOW 
  *           @arg PWR_WAKEUP_PIN3_HIGH or PWR_WAKEUP_PIN3_LOW 
  *           @arg PWR_WAKEUP_PIN4_HIGH or PWR_WAKEUP_PIN4_LOW
  *           @arg PWR_WAKEUP_PIN5_HIGH or PWR_WAKEUP_PIN5_LOW 
  *           @arg PWR_WAKEUP_PIN6_HIGH or PWR_WAKEUP_PIN6_LOW 
  * @note  PWR_WAKEUP_PINx and PWR_WAKEUP_PINx_HIGH are equivalent.               
  * @retval None
  */
void HAL_PWR_EnableWakeUpPin(uint32_t WakeUpPinPolarity)
{
  assert_param(IS_PWR_WAKEUP_PIN(WakeUpPinPolarity));
  
  /* Enable wake-up pin */
  SET_BIT(PWR->CSR2, (PWR_EWUP_MASK & WakeUpPinPolarity));
	
  /* Specifies the Wake-Up pin polarity for the event detection
    (rising or falling edge) */
  MODIFY_REG(PWR->CR2, (PWR_EWUP_MASK & WakeUpPinPolarity), (WakeUpPinPolarity >> 0x06));
}

/**
  * @brief Disables the WakeUp PINx functionality.
  * @param WakeUpPinx: Specifies the Power Wake-Up pin to disable.
  *         This parameter can be one of the following values:
  *           @arg PWR_WAKEUP_PIN1
  *           @arg PWR_WAKEUP_PIN2
  *           @arg PWR_WAKEUP_PIN3
  *           @arg PWR_WAKEUP_PIN4
  *           @arg PWR_WAKEUP_PIN5
  *           @arg PWR_WAKEUP_PIN6 
  * @retval None
  */
void HAL_PWR_DisableWakeUpPin(uint32_t WakeUpPinx)
{
  assert_param(IS_PWR_WAKEUP_PIN(WakeUpPinx));

  CLEAR_BIT(PWR->CSR2, WakeUpPinx);
}
  
/**
  * @brief Enters Sleep mode.
  *   
  * @note In Sleep mode, all I/O pins keep the same state as in Run mode.
  * 
  * @note In Sleep mode, the systick is stopped to avoid exit from this mode with
  *       systick interrupt when used as time base for Timeout 
  *                
  * @param Regulator: Specifies the regulator state in SLEEP mode.
  *            This parameter can be one of the following values:
  *            @arg PWR_MAINREGULATOR_ON: SLEEP mode with regulator ON
  *            @arg PWR_LOWPOWERREGULATOR_ON: SLEEP mode with low power regulator ON
  * @note This parameter is not used for the STM32F7 family and is kept as parameter
  *       just to maintain compatibility with the lower power families.
  * @param SLEEPEntry: Specifies if SLEEP mode in entered with WFI or WFE instruction.
  *          This parameter can be one of the following values:
  *            @arg PWR_SLEEPENTRY_WFI: enter SLEEP mode with WFI instruction
  *            @arg PWR_SLEEPENTRY_WFE: enter SLEEP mode with WFE instruction
  * @retval None
  */
void HAL_PWR_EnterSLEEPMode(uint32_t Regulator, uint8_t SLEEPEntry)
{
  /* Check the parameters */
  assert_param(IS_PWR_REGULATOR(Regulator));
  assert_param(IS_PWR_SLEEP_ENTRY(SLEEPEntry));

  /* Clear SLEEPDEEP bit of Cortex System Control Register */
  CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));

  /* Select SLEEP mode entry -------------------------------------------------*/
  if(SLEEPEntry == PWR_SLEEPENTRY_WFI)
  {   
    /* Request Wait For Interrupt */
    __WFI();
  }
  else
  {
    /* Request Wait For Event */
    __SEV();
    __WFE();
    __WFE();
  }
}

/**
  * @brief Enters Stop mode. 
  * @note In Stop mode, all I/O pins keep the same state as in Run mode.
  * @note When exiting Stop mode by issuing an interrupt or a wakeup event, 
  *         the HSI RC oscillator is selected as system clock.
  * @note When the voltage regulator operates in low power mode, an additional 
  *         startup delay is incurred when waking up from Stop mode. 
  *         By keeping the internal regulator ON during Stop mode, the consumption 
  *         is higher although the startup time is reduced.    
  * @param Regulator: Specifies the regulator state in Stop mode.
  *          This parameter can be one of the following values:
  *            @arg PWR_MAINREGULATOR_ON: Stop mode with regulator ON
  *            @arg PWR_LOWPOWERREGULATOR_ON: Stop mode with low power regulator ON
  * @param STOPEntry: Specifies if Stop mode in entered with WFI or WFE instruction.
  *          This parameter can be one of the following values:
  *            @arg PWR_STOPENTRY_WFI: Enter Stop mode with WFI instruction
  *            @arg PWR_STOPENTRY_WFE: Enter Stop mode with WFE instruction
  * @retval None
  */
void HAL_PWR_EnterSTOPMode(uint32_t Regulator, uint8_t STOPEntry)
{
  uint32_t tmpreg = 0;
  
  /* Check the parameters */
  assert_param(IS_PWR_REGULATOR(Regulator));
  assert_param(IS_PWR_STOP_ENTRY(STOPEntry));
  
  /* Select the regulator state in Stop mode ---------------------------------*/
  tmpreg = PWR->CR1;
  /* Clear PDDS and LPDS bits */
  tmpreg &= (uint32_t)~(PWR_CR1_PDDS | PWR_CR1_LPDS);
  
  /* Set LPDS, MRLVDS and LPLVDS bits according to Regulator value */
  tmpreg |= Regulator;
  
  /* Store the new value */
  PWR->CR1 = tmpreg;
  
  /* Set SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
  
  /* Select Stop mode entry --------------------------------------------------*/
  if(STOPEntry == PWR_STOPENTRY_WFI)
  {   
    /* Request Wait For Interrupt */
    __WFI();
  }
  else
  {
    /* Request Wait For Event */
    __SEV();
    __WFE();
    __WFE();
  }
  /* Reset SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);  
}

/**
  * @brief Enters Standby mode.
  * @note In Standby mode, all I/O pins are high impedance except for:
  *          - Reset pad (still available) 
  *          - RTC_AF1 pin (PC13) if configured for tamper, time-stamp, RTC 
  *            Alarm out, or RTC clock calibration out.
  *          - RTC_AF2 pin (PI8) if configured for tamper or time-stamp.  
  *          - WKUP pins if enabled.       
  * @retval None
  */
void HAL_PWR_EnterSTANDBYMode(void)
{
  /* Select Standby mode */
  PWR->CR1 |= PWR_CR1_PDDS;
  
  /* Set SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
  
  /* This option is used to ensure that store operations are completed */
#if defined ( __CC_ARM)
  __force_stores();
#endif
  /* Request Wait For Interrupt */
  __WFI();
}

/**
  * @brief This function handles the PWR PVD interrupt request.
  * @note This API should be called under the PVD_IRQHandler().
  * @retval None
  */
void HAL_PWR_PVD_IRQHandler(void)
{
  /* Check PWR Exti flag */
  if(__HAL_PWR_PVD_EXTI_GET_FLAG() != RESET)
  {
    /* PWR PVD interrupt user callback */
    HAL_PWR_PVDCallback();
    
    /* Clear PWR Exti pending bit */
    __HAL_PWR_PVD_EXTI_CLEAR_FLAG();
  }
}

/**
  * @brief  PWR PVD interrupt callback
  * @retval None
  */
__weak void HAL_PWR_PVDCallback(void)
{
  /* NOTE : This function Should not be modified, when the callback is needed,
            the HAL_PWR_PVDCallback could be implemented in the user file
   */ 
}

/**
  * @brief Indicates Sleep-On-Exit when returning from Handler mode to Thread mode. 
  * @note Set SLEEPONEXIT bit of SCR register. When this bit is set, the processor 
  *       re-enters SLEEP mode when an interruption handling is over.
  *       Setting this bit is useful when the processor is expected to run only on
  *       interruptions handling.         
  * @retval None
  */
void HAL_PWR_EnableSleepOnExit(void)
{
  /* Set SLEEPONEXIT bit of Cortex System Control Register */
  SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPONEXIT_Msk));
}

/**
  * @brief Disables Sleep-On-Exit feature when returning from Handler mode to Thread mode. 
  * @note Clears SLEEPONEXIT bit of SCR register. When this bit is set, the processor 
  *       re-enters SLEEP mode when an interruption handling is over.          
  * @retval None
  */
void HAL_PWR_DisableSleepOnExit(void)
{
  /* Clear SLEEPONEXIT bit of Cortex System Control Register */
  CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPONEXIT_Msk));
}

/**
  * @brief Enables CORTEX M4 SEVONPEND bit. 
  * @note Sets SEVONPEND bit of SCR register. When this bit is set, this causes 
  *       WFE to wake up when an interrupt moves from inactive to pended.
  * @retval None
  */
void HAL_PWR_EnableSEVOnPend(void)
{
  /* Set SEVONPEND bit of Cortex System Control Register */
  SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SEVONPEND_Msk));
}

/**
  * @brief Disables CORTEX M4 SEVONPEND bit. 
  * @note Clears SEVONPEND bit of SCR register. When this bit is set, this causes 
  *       WFE to wake up when an interrupt moves from inactive to pended.         
  * @retval None
  */
void HAL_PWR_DisableSEVOnPend(void)
{
  /* Clear SEVONPEND bit of Cortex System Control Register */
  CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SEVONPEND_Msk));
}

/**
  * @}
  */
  
/**
  * @}
  */

#endif /* HAL_PWR_MODULE_ENABLED */
/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/