| /** |
| ****************************************************************************** |
| * @file stm32l4xx_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/de-initialization functions |
| * + Peripheral Control functions |
| * |
| ****************************************************************************** |
| * @attention |
| * |
| * Copyright (c) 2019 STMicroelectronics. |
| * All rights reserved. |
| * |
| * This software is licensed under terms that can be found in the LICENSE file |
| * in the root directory of this software component. |
| * If no LICENSE file comes with this software, it is provided AS-IS. |
| * |
| ****************************************************************************** |
| */ |
| |
| /* Includes ------------------------------------------------------------------*/ |
| #include "stm32l4xx_hal.h" |
| |
| /** @addtogroup STM32L4xx_HAL_Driver |
| * @{ |
| */ |
| |
| /** @defgroup PWR PWR |
| * @brief PWR HAL module driver |
| * @{ |
| */ |
| |
| #ifdef HAL_PWR_MODULE_ENABLED |
| |
| /* Private typedef -----------------------------------------------------------*/ |
| /* Private define ------------------------------------------------------------*/ |
| |
| /** @defgroup PWR_Private_Defines PWR Private Defines |
| * @{ |
| */ |
| |
| /** @defgroup PWR_PVD_Mode_Mask PWR PVD Mode Mask |
| * @{ |
| */ |
| #define PVD_MODE_IT ((uint32_t)0x00010000) /*!< Mask for interruption yielded by PVD threshold crossing */ |
| #define PVD_MODE_EVT ((uint32_t)0x00020000) /*!< Mask for event yielded by PVD threshold crossing */ |
| #define PVD_RISING_EDGE ((uint32_t)0x00000001) /*!< Mask for rising edge set as PVD trigger */ |
| #define PVD_FALLING_EDGE ((uint32_t)0x00000002) /*!< Mask for falling edge set as PVD trigger */ |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /* Private macro -------------------------------------------------------------*/ |
| /* Private variables ---------------------------------------------------------*/ |
| /* Private function prototypes -----------------------------------------------*/ |
| /* Exported 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 ##### |
| =============================================================================== |
| [..] |
| |
| @endverbatim |
| * @{ |
| */ |
| |
| /** |
| * @brief Deinitialize 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 Enable access to the backup domain |
| * (RTC registers, RTC backup data registers). |
| * @note After reset, the backup domain is protected against |
| * possible unwanted write accesses. |
| * @note RTCSEL that sets the RTC clock source selection is in the RTC back-up domain. |
| * In order to set or modify the RTC clock, the backup domain access must be |
| * disabled. |
| * @note LSEON bit that switches on and off the LSE crystal belongs as well to the |
| * back-up domain. |
| * @retval None |
| */ |
| void HAL_PWR_EnableBkUpAccess(void) |
| { |
| SET_BIT(PWR->CR1, PWR_CR1_DBP); |
| } |
| |
| /** |
| * @brief Disable access to the backup domain |
| * (RTC registers, RTC backup data registers). |
| * @retval None |
| */ |
| void HAL_PWR_DisableBkUpAccess(void) |
| { |
| 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 PWR_CR2 register). |
| |
| (+) 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_PVD_EXTI_ENABLE_IT() macro. |
| (+) The PVD is stopped in Standby mode. |
| |
| |
| *** WakeUp pin configuration *** |
| ================================ |
| [..] |
| (+) WakeUp pins are used to wakeup the system from Standby mode or Shutdown mode. |
| The polarity of these pins can be set to configure event detection on high |
| level (rising edge) or low level (falling edge). |
| |
| |
| |
| *** Low Power modes configuration *** |
| ===================================== |
| [..] |
| The devices feature 8 low-power modes: |
| (+) Low-power Run mode: core and peripherals are running, main regulator off, low power regulator on. |
| (+) Sleep mode: Cortex-M4 core stopped, peripherals kept running, main and low power regulators on. |
| (+) Low-power Sleep mode: Cortex-M4 core stopped, peripherals kept running, main regulator off, low power regulator on. |
| (+) Stop 0 mode: all clocks are stopped except LSI and LSE, main and low power regulators on. |
| (+) Stop 1 mode: all clocks are stopped except LSI and LSE, main regulator off, low power regulator on. |
| (+) Stop 2 mode: all clocks are stopped except LSI and LSE, main regulator off, low power regulator on, reduced set of waking up IPs compared to Stop 1 mode. |
| (+) Standby mode with SRAM2: all clocks are stopped except LSI and LSE, SRAM2 content preserved, main regulator off, low power regulator on. |
| (+) Standby mode without SRAM2: all clocks are stopped except LSI and LSE, main and low power regulators off. |
| (+) Shutdown mode: all clocks are stopped except LSE, main and low power regulators off. |
| |
| |
| *** Low-power run mode *** |
| ========================== |
| [..] |
| (+) Entry: (from main run mode) |
| (++) set LPR bit with HAL_PWREx_EnableLowPowerRunMode() API after having decreased the system clock below 2 MHz. |
| |
| (+) Exit: |
| (++) clear LPR bit then wait for REGLP bit to be reset with HAL_PWREx_DisableLowPowerRunMode() API. Only |
| then can the system clock frequency be increased above 2 MHz. |
| |
| |
| *** Sleep mode / Low-power sleep mode *** |
| ========================================= |
| [..] |
| (+) Entry: |
| The Sleep mode / Low-power Sleep mode is entered thru HAL_PWR_EnterSLEEPMode() API |
| in specifying whether or not the regulator is forced to low-power mode and if exit is interrupt or event-triggered. |
| (++) PWR_MAINREGULATOR_ON: Sleep mode (regulator in main mode). |
| (++) PWR_LOWPOWERREGULATOR_ON: Low-power sleep (regulator in low power mode). |
| In the latter case, the system clock frequency must have been decreased below 2 MHz beforehand. |
| (++) PWR_SLEEPENTRY_WFI: enter SLEEP mode with WFI instruction |
| (++) PWR_SLEEPENTRY_WFE: enter SLEEP mode with WFE instruction |
| |
| (+) WFI Exit: |
| (++) Any peripheral interrupt acknowledged by the nested vectored interrupt |
| controller (NVIC) or any wake-up event. |
| |
| (+) WFE Exit: |
| (++) Any wake-up event such as an EXTI line configured in event mode. |
| |
| [..] When exiting the Low-power sleep mode by issuing an interrupt or a wakeup event, |
| the MCU is in Low-power Run mode. |
| |
| *** Stop 0, Stop 1 and Stop 2 modes *** |
| =============================== |
| [..] |
| (+) Entry: |
| The Stop 0, Stop 1 or Stop 2 modes are entered thru the following API's: |
| (++) HAL_PWREx_EnterSTOP0Mode() for mode 0 or HAL_PWREx_EnterSTOP1Mode() for mode 1 or for porting reasons HAL_PWR_EnterSTOPMode(). |
| (++) HAL_PWREx_EnterSTOP2Mode() for mode 2. |
| (+) Regulator setting (applicable to HAL_PWR_EnterSTOPMode() only): |
| (++) PWR_MAINREGULATOR_ON |
| (++) PWR_LOWPOWERREGULATOR_ON |
| (+) Exit (interrupt or event-triggered, specified when entering STOP mode): |
| (++) PWR_STOPENTRY_WFI: enter Stop mode with WFI instruction |
| (++) PWR_STOPENTRY_WFE: enter Stop mode with WFE instruction |
| |
| (+) WFI Exit: |
| (++) Any EXTI Line (Internal or External) configured in Interrupt mode. |
| (++) Some specific communication peripherals (USART, LPUART, I2C) interrupts |
| when programmed in wakeup mode. |
| (+) WFE Exit: |
| (++) Any EXTI Line (Internal or External) configured in Event mode. |
| |
| [..] |
| When exiting Stop 0 and Stop 1 modes, the MCU is either in Run mode or in Low-power Run mode |
| depending on the LPR bit setting. |
| When exiting Stop 2 mode, the MCU is in Run mode. |
| |
| *** Standby mode *** |
| ==================== |
| [..] |
| The Standby mode offers two options: |
| (+) option a) all clocks off except LSI and LSE, RRS bit set (keeps voltage regulator in low power mode). |
| SRAM and registers contents are lost except for the SRAM2 content, the RTC registers, RTC backup registers |
| and Standby circuitry. |
| (+) option b) all clocks off except LSI and LSE, RRS bit cleared (voltage regulator then disabled). |
| SRAM and register contents are lost except for the RTC registers, RTC backup registers |
| and Standby circuitry. |
| |
| (++) Entry: |
| (+++) The Standby mode is entered thru HAL_PWR_EnterSTANDBYMode() API. |
| SRAM1 and register contents are lost except for registers in the Backup domain and |
| Standby circuitry. SRAM2 content can be preserved if the bit RRS is set in PWR_CR3 register. |
| To enable this feature, the user can resort to HAL_PWREx_EnableSRAM2ContentRetention() API |
| to set RRS bit. |
| |
| (++) Exit: |
| (+++) WKUP pin rising edge, RTC alarm or wakeup, tamper event, time-stamp event, |
| external reset in NRST pin, IWDG reset. |
| |
| [..] After waking up from Standby mode, program execution restarts in the same way as after a Reset. |
| |
| |
| *** Shutdown mode *** |
| ====================== |
| [..] |
| In Shutdown mode, |
| voltage regulator is disabled, all clocks are off except LSE, RRS bit is cleared. |
| SRAM and registers contents are lost except for backup domain registers. |
| |
| (+) Entry: |
| The Shutdown mode is entered thru HAL_PWREx_EnterSHUTDOWNMode() API. |
| |
| (+) Exit: |
| (++) WKUP pin rising edge, RTC alarm or wakeup, tamper event, time-stamp event, |
| external reset in NRST pin. |
| |
| [..] After waking up from Shutdown mode, program execution restarts in the same way as after a 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, Standby and Shutdown 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 Configure the voltage threshold detected by the Power Voltage Detector (PVD). |
| * @param sConfigPVD: pointer to a PWR_PVDTypeDef structure that contains the PVD |
| * configuration information. |
| * @note Refer to the electrical characteristics of your device datasheet for |
| * more details about the voltage thresholds corresponding to each |
| * detection level. |
| * @retval None |
| */ |
| HAL_StatusTypeDef 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 bits according to PVDLevel value */ |
| MODIFY_REG(PWR->CR2, PWR_CR2_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_FALLING_EDGE(); |
| __HAL_PWR_PVD_EXTI_DISABLE_RISING_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(); |
| } |
| |
| return HAL_OK; |
| } |
| |
| |
| /** |
| * @brief Enable the Power Voltage Detector (PVD). |
| * @retval None |
| */ |
| void HAL_PWR_EnablePVD(void) |
| { |
| SET_BIT(PWR->CR2, PWR_CR2_PVDE); |
| } |
| |
| /** |
| * @brief Disable the Power Voltage Detector (PVD). |
| * @retval None |
| */ |
| void HAL_PWR_DisablePVD(void) |
| { |
| CLEAR_BIT(PWR->CR2, PWR_CR2_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 set the default polarity |
| * i.e. detection on high level (rising edge): |
| * @arg @ref PWR_WAKEUP_PIN1, PWR_WAKEUP_PIN2, PWR_WAKEUP_PIN3, PWR_WAKEUP_PIN4, PWR_WAKEUP_PIN5 |
| * |
| * or one of the following value where the user can explicitly specify the enabled pin and |
| * the chosen polarity: |
| * @arg @ref PWR_WAKEUP_PIN1_HIGH or PWR_WAKEUP_PIN1_LOW |
| * @arg @ref PWR_WAKEUP_PIN2_HIGH or PWR_WAKEUP_PIN2_LOW |
| * @arg @ref PWR_WAKEUP_PIN3_HIGH or PWR_WAKEUP_PIN3_LOW |
| * @arg @ref PWR_WAKEUP_PIN4_HIGH or PWR_WAKEUP_PIN4_LOW |
| * @arg @ref PWR_WAKEUP_PIN5_HIGH or PWR_WAKEUP_PIN5_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)); |
| |
| /* Specifies the Wake-Up pin polarity for the event detection |
| (rising or falling edge) */ |
| MODIFY_REG(PWR->CR4, (PWR_CR3_EWUP & WakeUpPinPolarity), (WakeUpPinPolarity >> PWR_WUP_POLARITY_SHIFT)); |
| |
| /* Enable wake-up pin */ |
| SET_BIT(PWR->CR3, (PWR_CR3_EWUP & WakeUpPinPolarity)); |
| |
| |
| } |
| |
| /** |
| * @brief Disable the WakeUp PINx functionality. |
| * @param WakeUpPinx: Specifies the Power Wake-Up pin to disable. |
| * This parameter can be one of the following values: |
| * @arg @ref PWR_WAKEUP_PIN1, PWR_WAKEUP_PIN2, PWR_WAKEUP_PIN3, PWR_WAKEUP_PIN4, PWR_WAKEUP_PIN5 |
| * @retval None |
| */ |
| void HAL_PWR_DisableWakeUpPin(uint32_t WakeUpPinx) |
| { |
| assert_param(IS_PWR_WAKEUP_PIN(WakeUpPinx)); |
| |
| CLEAR_BIT(PWR->CR3, (PWR_CR3_EWUP & WakeUpPinx)); |
| } |
| |
| |
| /** |
| * @brief Enter Sleep or Low-power Sleep mode. |
| * @note In Sleep/Low-power Sleep mode, all I/O pins keep the same state as in Run mode. |
| * @param Regulator: Specifies the regulator state in Sleep/Low-power Sleep mode. |
| * This parameter can be one of the following values: |
| * @arg @ref PWR_MAINREGULATOR_ON Sleep mode (regulator in main mode) |
| * @arg @ref PWR_LOWPOWERREGULATOR_ON Low-power Sleep mode (regulator in low-power mode) |
| * @note Low-power Sleep mode is entered from Low-power Run mode. Therefore, if not yet |
| * in Low-power Run mode before calling HAL_PWR_EnterSLEEPMode() with Regulator set |
| * to PWR_LOWPOWERREGULATOR_ON, the user can optionally configure the |
| * Flash in power-down monde in setting the SLEEP_PD bit in FLASH_ACR register. |
| * Additionally, the clock frequency must be reduced below 2 MHz. |
| * Setting SLEEP_PD in FLASH_ACR then appropriately reducing the clock frequency must |
| * be done before calling HAL_PWR_EnterSLEEPMode() API. |
| * @note When exiting Low-power Sleep mode, the MCU is in Low-power Run mode. To move in |
| * Run mode, the user must resort to HAL_PWREx_DisableLowPowerRunMode() API. |
| * @param SLEEPEntry: Specifies if Sleep mode is entered with WFI or WFE instruction. |
| * This parameter can be one of the following values: |
| * @arg @ref PWR_SLEEPENTRY_WFI enter Sleep or Low-power Sleep mode with WFI instruction |
| * @arg @ref PWR_SLEEPENTRY_WFE enter Sleep or Low-power Sleep mode with WFE instruction |
| * @note When WFI entry is used, tick interrupt have to be disabled if not desired as |
| * the interrupt wake up source. |
| * @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)); |
| |
| /* Set Regulator parameter */ |
| if (Regulator == PWR_MAINREGULATOR_ON) |
| { |
| /* If in low-power run mode at this point, exit it */ |
| if (HAL_IS_BIT_SET(PWR->SR2, PWR_SR2_REGLPF)) |
| { |
| if (HAL_PWREx_DisableLowPowerRunMode() != HAL_OK) |
| { |
| return ; |
| } |
| } |
| /* Regulator now in main mode. */ |
| } |
| else |
| { |
| /* If in run mode, first move to low-power run mode. |
| The system clock frequency must be below 2 MHz at this point. */ |
| if (HAL_IS_BIT_SET(PWR->SR2, PWR_SR2_REGLPF) == RESET) |
| { |
| HAL_PWREx_EnableLowPowerRunMode(); |
| } |
| } |
| |
| /* 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 Enter Stop mode |
| * @note This API is named HAL_PWR_EnterSTOPMode to ensure compatibility with legacy code running |
| * on devices where only "Stop mode" is mentioned with main or low power regulator ON. |
| * @note In Stop mode, all I/O pins keep the same state as in Run mode. |
| * @note All clocks in the VCORE domain are stopped; the PLL, the MSI, |
| * the HSI and the HSE oscillators are disabled. Some peripherals with the wakeup capability |
| * (I2Cx, USARTx and LPUART) can switch on the HSI to receive a frame, and switch off the HSI |
| * after receiving the frame if it is not a wakeup frame. In this case, the HSI clock is propagated |
| * only to the peripheral requesting it. |
| * SRAM1, SRAM2 and register contents are preserved. |
| * The BOR is available. |
| * The voltage regulator can be configured either in normal (Stop 0) or low-power mode (Stop 1). |
| * @note When exiting Stop 0 or Stop 1 mode by issuing an interrupt or a wakeup event, |
| * the HSI RC oscillator is selected as system clock if STOPWUCK bit in RCC_CFGR register |
| * is set; the MSI oscillator is selected if STOPWUCK is cleared. |
| * @note When the voltage regulator operates in low power mode (Stop 1), an additional |
| * startup delay is incurred when waking up. |
| * By keeping the internal regulator ON during Stop mode (Stop 0), 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 @ref PWR_MAINREGULATOR_ON Stop 0 mode (main regulator ON) |
| * @arg @ref PWR_LOWPOWERREGULATOR_ON Stop 1 mode (low power regulator ON) |
| * @param STOPEntry: Specifies Stop 0 or Stop 1 mode is entered with WFI or WFE instruction. |
| * This parameter can be one of the following values: |
| * @arg @ref PWR_STOPENTRY_WFI Enter Stop 0 or Stop 1 mode with WFI instruction. |
| * @arg @ref PWR_STOPENTRY_WFE Enter Stop 0 or Stop 1 mode with WFE instruction. |
| * @retval None |
| */ |
| void HAL_PWR_EnterSTOPMode(uint32_t Regulator, uint8_t STOPEntry) |
| { |
| /* Check the parameters */ |
| assert_param(IS_PWR_REGULATOR(Regulator)); |
| |
| if(Regulator == PWR_LOWPOWERREGULATOR_ON) |
| { |
| HAL_PWREx_EnterSTOP1Mode(STOPEntry); |
| } |
| else |
| { |
| HAL_PWREx_EnterSTOP0Mode(STOPEntry); |
| } |
| } |
| |
| /** |
| * @brief Enter Standby mode. |
| * @note In Standby mode, the PLL, the HSI, the MSI and the HSE oscillators are switched |
| * off. The voltage regulator is disabled, except when SRAM2 content is preserved |
| * in which case the regulator is in low-power mode. |
| * SRAM1 and register contents are lost except for registers in the Backup domain and |
| * Standby circuitry. SRAM2 content can be preserved if the bit RRS is set in PWR_CR3 register. |
| * To enable this feature, the user can resort to HAL_PWREx_EnableSRAM2ContentRetention() API |
| * to set RRS bit. |
| * The BOR is available. |
| * @note The I/Os can be configured either with a pull-up or pull-down or can be kept in analog state. |
| * HAL_PWREx_EnableGPIOPullUp() and HAL_PWREx_EnableGPIOPullDown() respectively enable Pull Up and |
| * Pull Down state, HAL_PWREx_DisableGPIOPullUp() and HAL_PWREx_DisableGPIOPullDown() disable the |
| * same. |
| * These states are effective in Standby mode only if APC bit is set through |
| * HAL_PWREx_EnablePullUpPullDownConfig() API. |
| * @retval None |
| */ |
| void HAL_PWR_EnterSTANDBYMode(void) |
| { |
| /* Set Stand-by mode */ |
| MODIFY_REG(PWR->CR1, PWR_CR1_LPMS, PWR_CR1_LPMS_STANDBY); |
| |
| /* Set SLEEPDEEP bit of Cortex System Control Register */ |
| SET_BIT(SCB->SCR, ((uint32_t)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 Indicate 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 Disable Sleep-On-Exit feature when returning from Handler mode to Thread mode. |
| * @note Clear 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 Enable CORTEX M4 SEVONPEND bit. |
| * @note Set 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 Disable CORTEX M4 SEVONPEND bit. |
| * @note Clear 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)); |
| } |
| |
| |
| |
| |
| |
| /** |
| * @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 can be implemented in the user file |
| */ |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| #endif /* HAL_PWR_MODULE_ENABLED */ |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
