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/** |
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****************************************************************************** |
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* @file stm32f0xx_hal_pwr.c |
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* @author MCD Application Team |
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* @brief PWR HAL module driver. |
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* This file provides firmware functions to manage the following |
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* functionalities of the Power Controller (PWR) peripheral: |
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* + Initialization/de-initialization function |
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* + Peripheral Control function |
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* |
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@verbatim |
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****************************************************************************** |
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* @attention |
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* |
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* <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2> |
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* |
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* Redistribution and use in source and binary forms, with or without modification, |
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* are permitted provided that the following conditions are met: |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright notice, |
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* this list of conditions and the following disclaimer in the documentation |
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* and/or other materials provided with the distribution. |
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* 3. Neither the name of STMicroelectronics nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************** |
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*/ |
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/* Includes ------------------------------------------------------------------*/ |
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#include "stm32f0xx_hal.h" |
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/** @addtogroup STM32F0xx_HAL_Driver |
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* @{ |
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*/ |
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/** @defgroup PWR PWR |
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* @brief PWR HAL module driver |
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* @{ |
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*/ |
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#ifdef HAL_PWR_MODULE_ENABLED |
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/* Private typedef -----------------------------------------------------------*/ |
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/* Private define ------------------------------------------------------------*/ |
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/* Private macro -------------------------------------------------------------*/ |
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/* Private variables ---------------------------------------------------------*/ |
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/* Private function prototypes -----------------------------------------------*/ |
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/* Private functions ---------------------------------------------------------*/ |
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/** @defgroup PWR_Exported_Functions PWR Exported Functions |
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* @{ |
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*/ |
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/** @defgroup PWR_Exported_Functions_Group1 Initialization and de-initialization functions |
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* @brief Initialization and de-initialization functions |
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* |
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@verbatim |
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=============================================================================== |
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##### Initialization and de-initialization functions ##### |
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=============================================================================== |
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[..] |
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After reset, the backup domain (RTC registers, RTC backup data |
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registers) is protected against possible unwanted |
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write accesses. |
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To enable access to the RTC Domain and RTC registers, proceed as follows: |
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(+) Enable the Power Controller (PWR) APB1 interface clock using the |
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__HAL_RCC_PWR_CLK_ENABLE() macro. |
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(+) Enable access to RTC domain using the HAL_PWR_EnableBkUpAccess() function. |
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@endverbatim |
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* @{ |
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*/ |
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/** |
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* @brief Deinitializes the PWR peripheral registers to their default reset values. |
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* @retval None |
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*/ |
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void HAL_PWR_DeInit(void) |
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{ |
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__HAL_RCC_PWR_FORCE_RESET(); |
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__HAL_RCC_PWR_RELEASE_RESET(); |
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} |
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/** |
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* @brief Enables access to the backup domain (RTC registers, RTC |
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* backup data registers when present). |
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* @note If the HSE divided by 32 is used as the RTC clock, the |
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* Backup Domain Access should be kept enabled. |
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* @retval None |
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*/ |
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void HAL_PWR_EnableBkUpAccess(void) |
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{ |
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PWR->CR |= (uint32_t)PWR_CR_DBP; |
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} |
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/** |
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* @brief Disables access to the backup domain (RTC registers, RTC |
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* backup data registers when present). |
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* @note If the HSE divided by 32 is used as the RTC clock, the |
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* Backup Domain Access should be kept enabled. |
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* @retval None |
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*/ |
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void HAL_PWR_DisableBkUpAccess(void) |
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{ |
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PWR->CR &= ~((uint32_t)PWR_CR_DBP); |
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} |
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/** |
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* @} |
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*/ |
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/** @defgroup PWR_Exported_Functions_Group2 Peripheral Control functions |
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* @brief Low Power modes configuration functions |
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* |
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@verbatim |
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=============================================================================== |
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##### Peripheral Control functions ##### |
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=============================================================================== |
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*** WakeUp pin configuration *** |
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================================ |
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[..] |
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(+) WakeUp pin is used to wakeup the system from Standby mode. This pin is |
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forced in input pull down configuration and is active on rising edges. |
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(+) There are two WakeUp pins, and up to eight Wakeup pins on STM32F07x & STM32F09x devices. |
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(++)WakeUp Pin 1 on PA.00. |
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(++)WakeUp Pin 2 on PC.13. |
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(++)WakeUp Pin 3 on PE.06.(STM32F07x/STM32F09x) |
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(++)WakeUp Pin 4 on PA.02.(STM32F07x/STM32F09x) |
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(++)WakeUp Pin 5 on PC.05.(STM32F07x/STM32F09x) |
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(++)WakeUp Pin 6 on PB.05.(STM32F07x/STM32F09x) |
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(++)WakeUp Pin 7 on PB.15.(STM32F07x/STM32F09x) |
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(++)WakeUp Pin 8 on PF.02.(STM32F07x/STM32F09x) |
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*** Low Power modes configuration *** |
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===================================== |
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[..] |
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The devices feature 3 low-power modes: |
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(+) Sleep mode: Cortex-M0 core stopped, peripherals kept running. |
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(+) Stop mode: all clocks are stopped, regulator running, regulator |
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in low power mode |
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(+) Standby mode: 1.2V domain powered off (mode not available on STM32F0x8 devices). |
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*** Sleep mode *** |
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================== |
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[..] |
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(+) Entry: |
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The Sleep mode is entered by using the HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFx) |
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functions with |
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(++) PWR_SLEEPENTRY_WFI: enter SLEEP mode with WFI instruction |
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(++) PWR_SLEEPENTRY_WFE: enter SLEEP mode with WFE instruction |
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(+) Exit: |
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(++) Any peripheral interrupt acknowledged by the nested vectored interrupt |
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controller (NVIC) can wake up the device from Sleep mode. |
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*** Stop mode *** |
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================= |
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[..] |
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In Stop mode, all clocks in the 1.8V domain are stopped, the PLL, the HSI, |
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and the HSE RC oscillators are disabled. Internal SRAM and register contents |
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are preserved. |
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The voltage regulator can be configured either in normal or low-power mode. |
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To minimize the consumption. |
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(+) Entry: |
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The Stop mode is entered using the HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_STOPENTRY_WFI ) |
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function with: |
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(++) Main regulator ON. |
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(++) Low Power regulator ON. |
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(++) PWR_STOPENTRY_WFI: enter STOP mode with WFI instruction |
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(++) PWR_STOPENTRY_WFE: enter STOP mode with WFE instruction |
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(+) Exit: |
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(++) Any EXTI Line (Internal or External) configured in Interrupt/Event mode. |
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(++) Some specific communication peripherals (CEC, USART, I2C) interrupts, |
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when programmed in wakeup mode (the peripheral must be |
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programmed in wakeup mode and the corresponding interrupt vector |
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must be enabled in the NVIC) |
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*** Standby mode *** |
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==================== |
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[..] |
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The Standby mode allows to achieve the lowest power consumption. It is based |
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on the Cortex-M0 deep sleep mode, with the voltage regulator disabled. |
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The 1.8V domain is consequently powered off. The PLL, the HSI oscillator and |
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the HSE oscillator are also switched off. SRAM and register contents are lost |
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except for the RTC registers, RTC backup registers and Standby circuitry. |
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The voltage regulator is OFF. |
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(+) Entry: |
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(++) The Standby mode is entered using the HAL_PWR_EnterSTANDBYMode() function. |
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(+) Exit: |
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(++) WKUP pin rising edge, RTC alarm (Alarm A), RTC wakeup, |
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tamper event, time-stamp event, external reset in NRST pin, IWDG reset. |
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*** Auto-wakeup (AWU) from low-power mode *** |
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============================================= |
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[..] |
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The MCU can be woken up from low-power mode by an RTC Alarm event, an RTC |
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Wakeup event, a tamper event, a time-stamp event, or a comparator event, |
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without depending on an external interrupt (Auto-wakeup mode). |
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(+) RTC auto-wakeup (AWU) from the Stop and Standby modes |
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(++) To wake up from the Stop mode with an RTC alarm event, it is necessary to |
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configure the RTC to generate the RTC alarm using the HAL_RTC_SetAlarm_IT() function. |
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(++) To wake up from the Stop mode with an RTC Tamper or time stamp event, it |
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is necessary to configure the RTC to detect the tamper or time stamp event using the |
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HAL_RTC_SetTimeStamp_IT() or HAL_RTC_SetTamper_IT() functions. |
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(++) To wake up from the Stop mode with an RTC WakeUp event, it is necessary to |
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configure the RTC to generate the RTC WakeUp event using the HAL_RTC_SetWakeUpTimer_IT() function. |
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(+) Comparator auto-wakeup (AWU) from the Stop mode |
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(++) To wake up from the Stop mode with a comparator wakeup event, it is necessary to: |
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(+++) Configure the EXTI Line associated with the comparator (example EXTI Line 22 for comparator 2) |
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to be sensitive to to the selected edges (falling, rising or falling |
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and rising) (Interrupt or Event modes) using the EXTI_Init() function. |
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(+++) Configure the comparator to generate the event. |
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@endverbatim |
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* @{ |
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*/ |
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/** |
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* @brief Enables the WakeUp PINx functionality. |
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* @param WakeUpPinx Specifies the Power Wake-Up pin to enable. |
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* This parameter can be value of : |
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* @ref PWREx_WakeUp_Pins |
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* @retval None |
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*/ |
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void HAL_PWR_EnableWakeUpPin(uint32_t WakeUpPinx) |
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{ |
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/* Check the parameters */ |
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assert_param(IS_PWR_WAKEUP_PIN(WakeUpPinx)); |
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/* Enable the EWUPx pin */ |
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SET_BIT(PWR->CSR, WakeUpPinx); |
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} |
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/** |
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* @brief Disables the WakeUp PINx functionality. |
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* @param WakeUpPinx Specifies the Power Wake-Up pin to disable. |
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* This parameter can be values of : |
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* @ref PWREx_WakeUp_Pins |
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* @retval None |
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*/ |
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void HAL_PWR_DisableWakeUpPin(uint32_t WakeUpPinx) |
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{ |
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/* Check the parameters */ |
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assert_param(IS_PWR_WAKEUP_PIN(WakeUpPinx)); |
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/* Disable the EWUPx pin */ |
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CLEAR_BIT(PWR->CSR, WakeUpPinx); |
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} |
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/** |
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* @brief Enters Sleep mode. |
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* @note In Sleep mode, all I/O pins keep the same state as in Run mode. |
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* @param Regulator Specifies the regulator state in SLEEP mode. |
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* On STM32F0 devices, this parameter is a dummy value and it is ignored |
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* as regulator can't be modified in this mode. Parameter is kept for platform |
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* compatibility. |
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* @param SLEEPEntry Specifies if SLEEP mode is entered with WFI or WFE instruction. |
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* When WFI entry is used, tick interrupt have to be disabled if not desired as |
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* the interrupt wake up source. |
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* This parameter can be one of the following values: |
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* @arg PWR_SLEEPENTRY_WFI: enter SLEEP mode with WFI instruction |
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* @arg PWR_SLEEPENTRY_WFE: enter SLEEP mode with WFE instruction |
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* @retval None |
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*/ |
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void HAL_PWR_EnterSLEEPMode(uint32_t Regulator, uint8_t SLEEPEntry) |
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{ |
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/* Check the parameters */ |
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assert_param(IS_PWR_REGULATOR(Regulator)); |
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assert_param(IS_PWR_SLEEP_ENTRY(SLEEPEntry)); |
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/* Clear SLEEPDEEP bit of Cortex System Control Register */ |
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SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk); |
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/* Select SLEEP mode entry -------------------------------------------------*/ |
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if(SLEEPEntry == PWR_SLEEPENTRY_WFI) |
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{ |
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/* Request Wait For Interrupt */ |
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__WFI(); |
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} |
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else |
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{ |
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/* Request Wait For Event */ |
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__SEV(); |
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__WFE(); |
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__WFE(); |
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} |
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} |
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/** |
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* @brief Enters STOP mode. |
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* @note In Stop mode, all I/O pins keep the same state as in Run mode. |
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* @note When exiting Stop mode by issuing an interrupt or a wakeup event, |
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* the HSI RC oscillator is selected as system clock. |
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* @note When the voltage regulator operates in low power mode, an additional |
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* startup delay is incurred when waking up from Stop mode. |
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* By keeping the internal regulator ON during Stop mode, the consumption |
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* is higher although the startup time is reduced. |
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* @param Regulator Specifies the regulator state in STOP mode. |
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* This parameter can be one of the following values: |
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* @arg PWR_MAINREGULATOR_ON: STOP mode with regulator ON |
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* @arg PWR_LOWPOWERREGULATOR_ON: STOP mode with low power regulator ON |
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* @param STOPEntry specifies if STOP mode in entered with WFI or WFE instruction. |
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* This parameter can be one of the following values: |
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* @arg PWR_STOPENTRY_WFI:Enter STOP mode with WFI instruction |
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* @arg PWR_STOPENTRY_WFE: Enter STOP mode with WFE instruction |
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* @retval None |
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*/ |
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void HAL_PWR_EnterSTOPMode(uint32_t Regulator, uint8_t STOPEntry) |
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{ |
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uint32_t tmpreg = 0; |
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/* Check the parameters */ |
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assert_param(IS_PWR_REGULATOR(Regulator)); |
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assert_param(IS_PWR_STOP_ENTRY(STOPEntry)); |
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/* Select the regulator state in STOP mode ---------------------------------*/ |
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tmpreg = PWR->CR; |
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/* Clear PDDS and LPDS bits */ |
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tmpreg &= (uint32_t)~(PWR_CR_PDDS | PWR_CR_LPDS); |
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/* Set LPDS bit according to Regulator value */ |
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tmpreg |= Regulator; |
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/* Store the new value */ |
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PWR->CR = tmpreg; |
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/* Set SLEEPDEEP bit of Cortex System Control Register */ |
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SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk; |
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/* Select STOP mode entry --------------------------------------------------*/ |
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if(STOPEntry == PWR_STOPENTRY_WFI) |
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{ |
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/* Request Wait For Interrupt */ |
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__WFI(); |
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} |
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else |
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{ |
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/* Request Wait For Event */ |
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__SEV(); |
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__WFE(); |
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__WFE(); |
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} |
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|
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/* Reset SLEEPDEEP bit of Cortex System Control Register */ |
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SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk); |
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} |
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|
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/** |
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* @brief Enters STANDBY mode. |
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* @note In Standby mode, all I/O pins are high impedance except for: |
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* - Reset pad (still available) |
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* - RTC alternate function pins if configured for tamper, time-stamp, RTC |
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* Alarm out, or RTC clock calibration out. |
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* - WKUP pins if enabled. |
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* STM32F0x8 devices, the Stop mode is available, but it is |
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* aningless to distinguish between voltage regulator in Low power |
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* mode and voltage regulator in Run mode because the regulator |
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* not used and the core is supplied directly from an external source. |
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* Consequently, the Standby mode is not available on those devices. |
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* @retval None |
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*/ |
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void HAL_PWR_EnterSTANDBYMode(void) |
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{ |
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/* Select STANDBY mode */ |
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PWR->CR |= (uint32_t)PWR_CR_PDDS; |
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|
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/* Set SLEEPDEEP bit of Cortex System Control Register */ |
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SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk; |
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|
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/* This option is used to ensure that store operations are completed */ |
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#if defined ( __CC_ARM) |
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__force_stores(); |
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#endif |
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/* Request Wait For Interrupt */ |
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__WFI(); |
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} |
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|
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/** |
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* @brief Indicates Sleep-On-Exit when returning from Handler mode to Thread mode. |
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* @note Set SLEEPONEXIT bit of SCR register. When this bit is set, the processor |
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* re-enters SLEEP mode when an interruption handling is over. |
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* Setting this bit is useful when the processor is expected to run only on |
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* interruptions handling. |
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* @retval None |
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*/ |
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void HAL_PWR_EnableSleepOnExit(void) |
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{ |
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/* Set SLEEPONEXIT bit of Cortex System Control Register */ |
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SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPONEXIT_Msk)); |
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} |
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|
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|
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/** |
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* @brief Disables Sleep-On-Exit feature when returning from Handler mode to Thread mode. |
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* @note Clears SLEEPONEXIT bit of SCR register. When this bit is set, the processor |
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* re-enters SLEEP mode when an interruption handling is over. |
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* @retval None |
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*/ |
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void HAL_PWR_DisableSleepOnExit(void) |
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{ |
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/* Clear SLEEPONEXIT bit of Cortex System Control Register */ |
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CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPONEXIT_Msk)); |
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} |
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426 |
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427 |
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/** |
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* @brief Enables CORTEX M4 SEVONPEND bit. |
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* @note Sets SEVONPEND bit of SCR register. When this bit is set, this causes |
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* WFE to wake up when an interrupt moves from inactive to pended. |
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* @retval None |
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*/ |
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void HAL_PWR_EnableSEVOnPend(void) |
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{ |
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/* Set SEVONPEND bit of Cortex System Control Register */ |
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SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SEVONPEND_Msk)); |
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} |
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/** |
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* @brief Disables CORTEX M4 SEVONPEND bit. |
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* @note Clears SEVONPEND bit of SCR register. When this bit is set, this causes |
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444 |
* WFE to wake up when an interrupt moves from inactive to pended. |
|
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* @retval None |
|
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*/ |
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void HAL_PWR_DisableSEVOnPend(void) |
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448 |
{ |
|
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/* Clear SEVONPEND bit of Cortex System Control Register */ |
|
450 |
CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SEVONPEND_Msk)); |
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} |
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452 |
|
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/** |
|
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* @} |
|
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*/ |
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456 |
|
|
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/** |
|
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* @} |
|
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*/ |
|
460 |
|
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#endif /* HAL_PWR_MODULE_ENABLED */ |
|
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/** |
|
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* @} |
|
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*/ |
|
465 |
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/** |
|
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* @} |
|
468 |
*/ |
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469 |
|
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |