tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32L1/stm32l1xx_hal_pwr.c

   1 /**
   2   ******************************************************************************
   3   * @file    stm32l1xx_hal_pwr.c
   4   * @author  MCD Application Team
   5   * @version V1.0.0
   6   * @date    5-September-2014
   7   * @brief   PWR HAL module driver.
   8   *
   9   *          This file provides firmware functions to manage the following
  10   *          functionalities of the Power Controller (PWR) peripheral:
  11   *           + Initialization/de-initialization functions
  12   *           + Peripheral Control functions
  13   *
  14   ******************************************************************************
  15   * @attention
  16   *
  17   * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
  18   *
  19   * Redistribution and use in source and binary forms, with or without modification,
  20   * are permitted provided that the following conditions are met:
  21   *   1. Redistributions of source code must retain the above copyright notice,
  22   *      this list of conditions and the following disclaimer.
  23   *   2. Redistributions in binary form must reproduce the above copyright notice,
  24   *      this list of conditions and the following disclaimer in the documentation
  25   *      and/or other materials provided with the distribution.
  26   *   3. Neither the name of STMicroelectronics nor the names of its contributors
  27   *      may be used to endorse or promote products derived from this software
  28   *      without specific prior written permission.
  29   *
  30   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  31   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  32   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  33   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  34   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  35   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  36   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  37   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  38   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  39   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40   *
  41   ******************************************************************************
  42   */
  43
  44 /* Includes ------------------------------------------------------------------*/
  45 #include "stm32l1xx_hal.h"
  46
  47 /** @addtogroup STM32L1xx_HAL_Driver
  48   * @{
  49   */
  50
  51 /** @defgroup PWR PWR
  52   * @brief    PWR HAL module driver
  53   * @{
  54   */
  55
  56 #ifdef HAL_PWR_MODULE_ENABLED
  57
  58 /* Private typedef -----------------------------------------------------------*/
  59 /* Private define ------------------------------------------------------------*/
  60 #define PVD_MODE_IT               ((uint32_t)0x00010000)
  61 #define PVD_MODE_EVT              ((uint32_t)0x00020000)
  62 #define PVD_RISING_EDGE           ((uint32_t)0x00000001)
  63 #define PVD_FALLING_EDGE          ((uint32_t)0x00000002)
  64
  65 /* Private macro -------------------------------------------------------------*/
  66 /* Private variables ---------------------------------------------------------*/
  67 /* Private function prototypes -----------------------------------------------*/
  68 /* Private functions ---------------------------------------------------------*/
  69
  70 /** @defgroup PWR_Exported_Functions PWR Exported Functions
  71   * @{
  72   */
  73
  74 /** @defgroup PWR_Exported_Functions_Group1 Initialization and de-initialization functions
  75   *  @brief   Initialization and de-initialization functions
  76   *
  77 @verbatim
  78  ===============================================================================
  79               ##### Initialization and de-initialization functions #####
  80  ===============================================================================
  81     [..]
  82       After reset, the backup domain (RTC registers, RTC backup data
  83       registers) is protected against possible unwanted
  84       write accesses.
  85       To enable access to the RTC Domain and RTC registers, proceed as follows:
  86         (+) Enable the Power Controller (PWR) APB1 interface clock using the
  87             __PWR_CLK_ENABLE() macro.
  88         (+) Enable access to RTC domain using the HAL_PWR_EnableBkUpAccess() function.
  89
  90 @endverbatim
  91   * @{
  92   */
  93
  94 /**
  95   * @brief  Deinitializes the PWR peripheral registers to their default reset values.
  96   * @note   Before calling this function, the VOS[1:0] bits should be configured
  97   *         to "10" and the system frequency has to be configured accordingly.
  98   *         To configure the VOS[1:0] bits, use the PWR_VoltageScalingConfig()
  99   *         function.
 100   * @note   ULP and FWU bits are not reset by this function.
 101   * @retval None
 102   */
 103 void HAL_PWR_DeInit(void)
 104 {
 105   __PWR_FORCE_RESET();
 106   __PWR_RELEASE_RESET();
 107 }
 108
 109 /**
 110   * @brief  Enables access to the backup domain (RTC registers, RTC
 111   *         backup data registers ).
 112   * @note   If the HSE divided by 2, 4, 8 or 16 is used as the RTC clock, the
 113   *         Backup Domain Access should be kept enabled.
 114   * @retval None
 115   */
 116 void HAL_PWR_EnableBkUpAccess(void)
 117 {
 118   /* Enable access to RTC and backup registers */
 119   *(__IO uint32_t *) CR_DBP_BB = (uint32_t)ENABLE;
 120 }
 121
 122 /**
 123   * @brief  Disables access to the backup domain (RTC registers, RTC
 124   *         backup data registers).
 125   * @note   If the HSE divided by 2, 4, 8 or 16 is used as the RTC clock, the
 126   *         Backup Domain Access should be kept enabled.
 127   * @retval None
 128   */
 129 void HAL_PWR_DisableBkUpAccess(void)
 130 {
 131   /* Disable access to RTC and backup registers */
 132   *(__IO uint32_t *) CR_DBP_BB = (uint32_t)DISABLE;
 133 }
 134
 135 /**
 136   * @}
 137   */
 138
 139 /** @defgroup PWR_Exported_Functions_Group2 Peripheral Control functions
 140   * @brief    Low Power modes configuration functions
 141   *
 142 @verbatim
 143
 144  ===============================================================================
 145                  ##### Peripheral Control functions #####
 146  ===============================================================================
 147
 148     *** PVD configuration ***
 149     =========================
 150     [..]
 151       (+) The PVD is used to monitor the VDD power supply by comparing it to a
 152           threshold selected by the PVD Level (PLS[2:0] bits in the PWR_CR).
 153       (+) The PVD can use an external input analog voltage (PVD_IN) which is compared
 154       internally to VREFINT. The PVD_IN (PB7) has to be configured in Analog mode
 155       when PWR_PVDLevel_7 is selected (PLS[2:0] = 111).
 156
 157       (+) A PVDO flag is available to indicate if VDD/VDDA is higher or lower
 158           than the PVD threshold. This event is internally connected to the EXTI
 159           line16 and can generate an interrupt if enabled. This is done through
 160           __HAL_PVD_EXTI_ENABLE_IT() macro.
 161       (+) The PVD is stopped in Standby mode.
 162
 163     *** WakeUp pin configuration ***
 164     ================================
 165     [..]
 166       (+) WakeUp pin is used to wake up the system from Standby mode. This pin is
 167           forced in input pull-down configuration and is active on rising edges.
 168       (+) There are two or three WakeUp pins:
 169           WakeUp Pin 1 on PA.00.
 170           WakeUp Pin 2 on PC.13.
 171           WakeUp Pin 3 on PE.06. : Only on product with GPIOE available
 172
 173     [..]
 174     *** Main and Backup Regulators configuration ***
 175     ================================================
 176
 177       (+) The main internal regulator can be configured to have a tradeoff between
 178           performance and power consumption when the device does not operate at
 179           the maximum frequency. This is done through __HAL_PWR_VOLTAGESCALING_CONFIG()
 180           macro which configure VOS bit in PWR_CR register:
 181         (++) When this bit is set (Regulator voltage output Scale 1 mode selected)
 182              the System frequency can go up to 32 MHz.
 183         (++) When this bit is reset (Regulator voltage output Scale 2 mode selected)
 184              the System frequency can go up to 16 MHz.
 185         (++) When this bit is reset (Regulator voltage output Scale 3 mode selected)
 186              the System frequency can go up to 4.2 MHz.
 187
 188         Refer to the datasheets for more details.
 189
 190     *** Low Power modes configuration ***
 191     =====================================
 192      [..]
 193       The device features 5 low-power modes:
 194       (+) Low power run mode: regulator in low power mode, limited clock frequency,
 195         limited number of peripherals running.
 196       (+) Sleep mode: Cortex-M3 core stopped, peripherals kept running.
 197       (+) Low power sleep mode: Cortex-M3 core stopped, limited clock frequency,
 198          limited number of peripherals running, regulator in low power mode.
 199       (+) Stop mode: All clocks are stopped, regulator running, regulator in low power mode.
 200       (+) Standby mode: VCORE domain powered off
 201
 202    *** Low power run mode ***
 203    =========================
 204     [..]
 205        To further reduce the consumption when the system is in Run mode, the regulator can be
 206         configured in low power mode. In this mode, the system frequency should not exceed
 207         MSI frequency range1.
 208         In Low power run mode, all I/O pins keep the same state as in Run mode.
 209
 210       (+) Entry:
 211         (++) VCORE in range2
 212         (++) Decrease the system frequency tonot exceed the frequency of MSI frequency range1.
 213         (++) The regulator is forced in low power mode using the HAL_PWREx_EnableLowPowerRunMode()
 214              function.
 215       (+) Exit:
 216         (++) The regulator is forced in Main regulator mode using the HAL_PWREx_DisableLowPowerRunMode()
 217               function.
 218         (++) Increase the system frequency if needed.
 219
 220    *** Sleep mode ***
 221    ==================
 222     [..]
 223       (+) Entry:
 224           The Sleep mode is entered by using the HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFx)
 225               functions with
 226           (++) PWR_SLEEPENTRY_WFI: enter SLEEP mode with WFI instruction
 227           (++) PWR_SLEEPENTRY_WFE: enter SLEEP mode with WFE instruction
 228
 229       (+) Exit:
 230         (++) Any peripheral interrupt acknowledged by the nested vectored interrupt
 231               controller (NVIC) can wake up the device from Sleep mode.
 232
 233    *** Low power sleep mode ***
 234    ============================
 235     [..]
 236       (+) Entry:
 237           The Low power sleep mode is entered by using the HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFx)
 238               functions with
 239           (++) PWR_SLEEPENTRY_WFI: enter SLEEP mode with WFI instruction
 240           (++) PWR_SLEEPENTRY_WFE: enter SLEEP mode with WFE instruction
 241        (+) The Flash memory can be switched off by using the control bits (SLEEP_PD in the FLASH_ACR register.
 242              This reduces power consumption but increases the wake-up time.
 243
 244       (+) Exit:
 245         (++) If the WFI instruction was used to enter Low power sleep mode, any peripheral interrupt
 246               acknowledged by the nested vectored interrupt controller (NVIC) can wake up the device
 247               from Low power sleep mode. If the WFE instruction was used to enter Low power sleep mode,
 248               the MCU exits Sleep mode as soon as an event occurs.
 249
 250    *** Stop mode ***
 251    =================
 252     [..]
 253       The Stop mode is based on the Cortex-M3 deepsleep mode combined with peripheral
 254       clock gating. The voltage regulator can be configured either in normal or low-power mode.
 255       In Stop mode, all clocks in the VCORE domain are stopped, the PLL, the MSI, the HSI and
 256       the HSE RC oscillators are disabled. Internal SRAM and register contents are preserved.
 257       To get the lowest consumption in Stop mode, the internal Flash memory also enters low
 258       power mode. When the Flash memory is in power-down mode, an additional startup delay is
 259       incurred when waking up from Stop mode.
 260       To minimize the consumption In Stop mode, VREFINT, the BOR, PVD, and temperature
 261       sensor can be switched off before entering Stop mode. They can be switched on again by
 262       software after exiting Stop mode using the ULP bit in the PWR_CR register.
 263       In Stop mode, all I/O pins keep the same state as in Run mode.
 264
 265       (+) Entry:
 266            The Stop mode is entered using the HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI )
 267              function with:
 268           (++) Main regulator ON.
 269           (++) Low Power regulator ON.
 270           (++) PWR_SLEEPENTRY_WFI: enter SLEEP mode with WFI instruction
 271           (++) PWR_SLEEPENTRY_WFE: enter SLEEP mode with WFE instruction
 272       (+) Exit:
 273         (++) By issuing an interrupt or a wakeup event, the MSI RC oscillator is selected as system clock.
 274
 275    *** Standby mode ***
 276    ====================
 277      [..]
 278       The Standby mode allows to achieve the lowest power consumption. It is based on the
 279       Cortex-M3 deepsleep mode, with the voltage regulator disabled. The VCORE domain is
 280       consequently powered off. The PLL, the MSI, the HSI oscillator and the HSE oscillator are
 281       also switched off. SRAM and register contents are lost except for the RTC registers, RTC
 282       backup registers and Standby circuitry.
 283
 284       To minimize the consumption In Standby mode, VREFINT, the BOR, PVD, and temperature
 285        sensor can be switched off before entering the Standby mode. They can be switched
 286        on again by software after exiting the Standby mode.
 287        function.
 288
 289       (+) Entry:
 290         (++) The Standby mode is entered using the HAL_PWR_EnterSTANDBYMode() function.
 291       (+) Exit:
 292         (++) WKUP pin rising edge, RTC alarm (Alarm A and Alarm B), RTC wakeup,
 293              tamper event, time-stamp event, external reset in NRST pin, IWDG reset.
 294
 295    *** Auto-wakeup (AWU) from low-power mode ***
 296    =============================================
 297     [..]
 298       The MCU can be woken up from low-power mode by an RTC Alarm event, an RTC
 299       Wakeup event, a tamper event, a time-stamp event, or a comparator event,
 300       without depending on an external interrupt (Auto-wakeup mode).
 301
 302     (+) RTC auto-wakeup (AWU) from the Stop mode
 303         (++) To wake up from the Stop mode with an RTC alarm event, it is necessary to:
 304              (+++) Configure the EXTI Line 17 to be sensitive to rising edges (Interrupt
 305                    or Event modes) and Enable the RTC Alarm Interrupt using the HAL_RTC_SetAlarm_IT()
 306                    function
 307              (+++) Configure the RTC to generate the RTC alarm using the HAL_RTC_Init()
 308                    and HAL_RTC_SetTime() functions.
 309         (++) To wake up from the Stop mode with an RTC Tamper or time stamp event, it
 310              is necessary to:
 311              (+++) Configure the EXTI Line 19 to be sensitive to rising edges (Interrupt or Event modes) and
 312                    Enable the RTC Tamper or time stamp Interrupt using the HAL_RTCEx_SetTamper_IT()
 313                    or HAL_RTCEx_SetTimeStamp_IT() functions.
 314         (++) To wake up from the Stop mode with an RTC WakeUp event, it is necessary to:
 315              (+++) Configure the EXTI Line 20 to be sensitive to rising edges (Interrupt or Event modes) and
 316                    Enable the RTC WakeUp Interrupt using the HAL_RTCEx_SetWakeUpTimer_IT() function.
 317              (+++) Configure the RTC to generate the RTC WakeUp event using the HAL_RTCEx_SetWakeUpTimer()
 318                    function.
 319
 320     (+) RTC auto-wakeup (AWU) from the Standby mode
 321         (++) To wake up from the Standby mode with an RTC alarm event, it is necessary to:
 322              (+++) Enable the RTC Alarm Interrupt using the HAL_RTC_SetAlarm_IT() function.
 323              (+++) Configure the RTC to generate the RTC alarm using the HAL_RTC_Init()
 324                    and HAL_RTC_SetTime() functions.
 325         (++) To wake up from the Standby mode with an RTC Tamper or time stamp event, it
 326              is necessary to:
 327              (+++) Enable the RTC Tamper or time stamp Interrupt and Configure the RTC to
 328                    detect the tamper or time stamp event using the HAL_RTCEx_SetTimeStamp_IT()
 329                    or HAL_RTCEx_SetTamper_IT()functions.
 330         (++) To wake up from the Standby mode with an RTC WakeUp event, it is necessary to:
 331              (+++) Enable the RTC WakeUp Interrupt and Configure the RTC to generate the RTC WakeUp event
 332                    using the HAL_RTCEx_SetWakeUpTimer_IT() and HAL_RTCEx_SetWakeUpTimer() functions.
 333
 334     (+) Comparator auto-wakeup (AWU) from the Stop mode
 335         (++) To wake up from the Stop mode with an comparator 1 or comparator 2 wakeup
 336              event, it is necessary to:
 337              (+++) Configure the EXTI Line 21 or EXTI Line 22 for comparator to be sensitive to to the
 338                    selected edges (falling, rising or falling and rising) (Interrupt or Event modes) using
 339                    the COMP functions.
 340              (+++) Configure the comparator to generate the event.
 341
 342
 343
 344 @endverbatim
 345   * @{
 346   */
 347
 348 /**
 349   * @brief  Configures the voltage threshold detected by the Power Voltage Detector(PVD).
 350   * @param  sConfigPVD: pointer to an PWR_PVDTypeDef structure that contains the configuration
 351   *         information for the PVD.
 352   * @note   Refer to the electrical characteristics of your device datasheet for
 353   *         more details about the voltage threshold corresponding to each
 354   *         detection level.
 355   * @retval None
 356   */
 357 void HAL_PWR_PVDConfig(PWR_PVDTypeDef *sConfigPVD)
 358 {
 359   /* Check the parameters */
 360   assert_param(IS_PWR_PVD_LEVEL(sConfigPVD->PVDLevel));
 361   assert_param(IS_PWR_PVD_MODE(sConfigPVD->Mode));
 362
 363   /* Set PLS[7:5] bits according to PVDLevel value */
 364   MODIFY_REG(PWR->CR, PWR_CR_PLS, sConfigPVD->PVDLevel);
 365
 366   /* Clear any previous config. Keep it clear if no event or IT mode is selected */
 367   __HAL_PWR_PVD_EXTI_DISABLE_EVENT();
 368   __HAL_PWR_PVD_EXTI_DISABLE_IT();
 369   __HAL_PWR_PVD_EXTI_CLEAR_EGDE_TRIGGER();
 370
 371   /* Configure interrupt mode */
 372   if((sConfigPVD->Mode & PVD_MODE_IT) == PVD_MODE_IT)
 373   {
 374     __HAL_PWR_PVD_EXTI_ENABLE_IT();
 375   }
 376
 377   /* Configure event mode */
 378   if((sConfigPVD->Mode & PVD_MODE_EVT) == PVD_MODE_EVT)
 379   {
 380     __HAL_PWR_PVD_EXTI_ENABLE_EVENT();
 381   }
 382
 383   /* Configure the edge */
 384   if((sConfigPVD->Mode & PVD_RISING_EDGE) == PVD_RISING_EDGE)
 385   {
 386     __HAL_PWR_PVD_EXTI_SET_RISING_EDGE_TRIGGER();
 387   }
 388
 389   if((sConfigPVD->Mode & PVD_FALLING_EDGE) == PVD_FALLING_EDGE)
 390   {
 391     __HAL_PWR_PVD_EXTI_SET_FALLING_EGDE_TRIGGER();
 392   }
 393 }
 394
 395 /**
 396   * @brief  Enables the Power Voltage Detector(PVD).
 397   * @retval None
 398   */
 399 void HAL_PWR_EnablePVD(void)
 400 {
 401   /* Enable the power voltage detector */
 402   *(__IO uint32_t *) CR_PVDE_BB = (uint32_t)ENABLE;
 403 }
 404
 405 /**
 406   * @brief  Disables the Power Voltage Detector(PVD).
 407   * @retval None
 408   */
 409 void HAL_PWR_DisablePVD(void)
 410 {
 411   /* Disable the power voltage detector */
 412   *(__IO uint32_t *) CR_PVDE_BB = (uint32_t)DISABLE;
 413 }
 414
 415 /**
 416   * @brief Enables the WakeUp PINx functionality.
 417   * @param WakeUpPinx: Specifies the Power Wake-Up pin to enable.
 418   *        This parameter can be one of the following values:
 419   *           @arg PWR_WAKEUP_PIN1
 420   *           @arg PWR_WAKEUP_PIN2
 421   *           @arg PWR_WAKEUP_PIN3: Only on product with GPIOE available
 422   * @retval None
 423   */
 424 void HAL_PWR_EnableWakeUpPin(uint32_t WakeUpPinx)
 425 {
 426   /* Check the parameter */
 427   assert_param(IS_PWR_WAKEUP_PIN(WakeUpPinx));
 428   /* Enable the EWUPx pin */
 429   *(__IO uint32_t *) CSR_EWUP_BB(WakeUpPinx) = (uint32_t)ENABLE;
 430 }
 431
 432 /**
 433   * @brief Disables the WakeUp PINx functionality.
 434   * @param WakeUpPinx: Specifies the Power Wake-Up pin to disable.
 435   *        This parameter can be one of the following values:
 436   *           @arg PWR_WAKEUP_PIN1
 437   *           @arg PWR_WAKEUP_PIN2
 438   *           @arg PWR_WAKEUP_PIN3: Only on product with GPIOE available
 439   * @retval None
 440   */
 441 void HAL_PWR_DisableWakeUpPin(uint32_t WakeUpPinx)
 442 {
 443   /* Check the parameter */
 444   assert_param(IS_PWR_WAKEUP_PIN(WakeUpPinx));
 445   /* Disable the EWUPx pin */
 446   *(__IO uint32_t *) CSR_EWUP_BB(WakeUpPinx) = (uint32_t)DISABLE;
 447 }
 448
 449 /**
 450   * @brief Enters Sleep mode.
 451   * @note  In Sleep mode, all I/O pins keep the same state as in Run mode.
 452   * @param Regulator: Specifies the regulator state in SLEEP mode.
 453   *         This parameter can be one of the following values:
 454   *            @arg PWR_MAINREGULATOR_ON: SLEEP mode with regulator ON
 455   *            @arg PWR_LOWPOWERREGULATOR_ON: SLEEP mode with low power regulator ON
 456   * @param SLEEPEntry: Specifies if SLEEP mode is entered with WFI or WFE instruction.
 457   *           When WFI entry is used, tick interrupt have to be disabled if not desired as
 458   *           the interrupt wake up source.
 459   *           This parameter can be one of the following values:
 460   *            @arg PWR_SLEEPENTRY_WFI: enter SLEEP mode with WFI instruction
 461   *            @arg PWR_SLEEPENTRY_WFE: enter SLEEP mode with WFE instruction
 462   * @retval None
 463   */
 464 void HAL_PWR_EnterSLEEPMode(uint32_t Regulator, uint8_t SLEEPEntry)
 465 {
 466   /* Check the parameters */
 467   assert_param(IS_PWR_REGULATOR(Regulator));
 468   assert_param(IS_PWR_SLEEP_ENTRY(SLEEPEntry));
 469
 470   /* Select the regulator state in Sleep mode: Set PDDS and LPSDSR bit according to PWR_Regulator value */
 471   MODIFY_REG(PWR->CR, (PWR_CR_PDDS | PWR_CR_LPSDSR), Regulator);
 472
 473   /* Clear SLEEPDEEP bit of Cortex System Control Register */
 474   CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));
 475
 476   /* Select SLEEP mode entry -------------------------------------------------*/
 477   if(SLEEPEntry == PWR_SLEEPENTRY_WFI)
 478   {
 479     /* Request Wait For Interrupt */
 480     __WFI();
 481   }
 482   else
 483   {
 484     /* Request Wait For Event */
 485     __SEV();
 486     __WFE();
 487     __WFE();
 488   }
 489 }
 490
 491 /**
 492   * @brief Enters Stop mode.
 493   * @note  In Stop mode, all I/O pins keep the same state as in Run mode.
 494   * @note  When exiting Stop mode by using an interrupt or a wakeup event,
 495   *        MSI RC oscillator is selected as system clock.
 496   * @note  When the voltage regulator operates in low power mode, an additional
 497   *         startup delay is incurred when waking up from Stop mode.
 498   *         By keeping the internal regulator ON during Stop mode, the consumption
 499   *         is higher although the startup time is reduced.
 500   * @param Regulator: Specifies the regulator state in Stop mode.
 501   *          This parameter can be one of the following values:
 502   *            @arg PWR_MAINREGULATOR_ON: Stop mode with regulator ON
 503   *            @arg PWR_LOWPOWERREGULATOR_ON: Stop mode with low power regulator ON
 504   * @param STOPEntry: Specifies if Stop mode in entered with WFI or WFE instruction.
 505   *          This parameter can be one of the following values:
 506   *            @arg PWR_STOPENTRY_WFI: Enter Stop mode with WFI instruction
 507   *            @arg PWR_STOPENTRY_WFE: Enter Stop mode with WFE instruction
 508   * @retval None
 509   */
 510 void HAL_PWR_EnterSTOPMode(uint32_t Regulator, uint8_t STOPEntry)
 511 {
 512   /* Check the parameters */
 513   assert_param(IS_PWR_REGULATOR(Regulator));
 514   assert_param(IS_PWR_STOP_ENTRY(STOPEntry));
 515
 516   /* Select the regulator state in Stop mode: Set PDDS and LPSDSR bit according to PWR_Regulator value */
 517   MODIFY_REG(PWR->CR, (PWR_CR_PDDS | PWR_CR_LPSDSR), Regulator);
 518
 519   /* Set SLEEPDEEP bit of Cortex System Control Register */
 520   SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));
 521
 522   /* Select Stop mode entry --------------------------------------------------*/
 523   if(STOPEntry == PWR_STOPENTRY_WFI)
 524   {
 525     /* Request Wait For Interrupt */
 526     __WFI();
 527   }
 528   else
 529   {
 530     /* Request Wait For Event */
 531     __SEV();
 532     __WFE();
 533     __WFE();
 534   }
 535   /* Reset SLEEPDEEP bit of Cortex System Control Register */
 536   CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));
 537 }
 538
 539 /**
 540   * @brief Enters Standby mode.
 541   * @note  In Standby mode, all I/O pins are high impedance except for:
 542   *          - Reset pad (still available)
 543   *          - RTC_AF1 pin (PC13) if configured for tamper, time-stamp, RTC
 544   *            Alarm out, or RTC clock calibration out.
 545   *          - WKUP pin 1 (PA0) if enabled.
 546   *          - WKUP pin 2 (PC13) if enabled.
 547   *          - WKUP pin 3 (PE6) if enabled.
 548   * @retval None
 549   */
 550 void HAL_PWR_EnterSTANDBYMode(void)
 551 {
 552   /* Select Standby mode */
 553   SET_BIT(PWR->CR, PWR_CR_PDDS);
 554
 555   /* Set SLEEPDEEP bit of Cortex System Control Register */
 556   SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));
 557
 558   /* This option is used to ensure that store operations are completed */
 559 #if defined ( __CC_ARM)
 560   __force_stores();
 561 #endif
 562   /* Request Wait For Interrupt */
 563   __WFI();
 564 }
 565
 566 /**
 567   * @brief  This function handles the PWR PVD interrupt request.
 568   * @note   This API should be called under the PVD_IRQHandler().
 569   * @retval None
 570   */
 571 void HAL_PWR_PVD_IRQHandler(void)
 572 {
 573   /* Check PWR exti flag */
 574   if(__HAL_PWR_PVD_EXTI_GET_FLAG() != RESET)
 575   {
 576     /* PWR PVD interrupt user callback */
 577     HAL_PWR_PVDCallback();
 578
 579     /* Clear PWR Exti pending bit */
 580     __HAL_PWR_PVD_EXTI_CLEAR_FLAG();
 581   }
 582 }
 583
 584 /**
 585   * @brief  PWR PVD interrupt callback
 586   * @retval None
 587   */
 588 __weak void HAL_PWR_PVDCallback(void)
 589 {
 590   /* NOTE : This function Should not be modified, when the callback is needed,
 591             the HAL_PWR_PVDCallback could be implemented in the user file
 592    */
 593 }
 594
 595 /**
 596   * @}
 597   */
 598
 599 /**
 600   * @}
 601   */
 602
 603 #endif /* HAL_PWR_MODULE_ENABLED */
 604 /**
 605   * @}
 606   */
 607
 608 /**
 609   * @}
 610   */
 611
 612 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/