451 lines
16 KiB
C
451 lines
16 KiB
C
/**
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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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******************************************************************************
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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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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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/* 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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* @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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/* Set SLEEPDEEP bit of Cortex System Control Register */
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SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
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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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* @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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* @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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/**
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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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* 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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{
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/* Clear SEVONPEND bit of Cortex System Control Register */
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CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SEVONPEND_Msk));
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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#endif /* HAL_PWR_MODULE_ENABLED */
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/**
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* @}
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*/
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/**
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* @}
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*/
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