text: /**
    ******************************************************************************
    * @file    stm32l0xx_hal_pwr_ex.c
    * @author  MCD Application Team
    * @version V1.3.0
    * @date    09-September-2015
    * @brief   Extended PWR HAL module driver.
    *          This file provides firmware functions to manage the following
    *          functionalities of the Power Controller (PWR) peripheral:
    *           + Extended Initialization and de-initialization functions
    *           + Extended Peripheral Control functions
    *         
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
    *
    * Redistribution and use in source and binary forms, with or without modification,
    * are permitted provided that the following conditions are met:
    *   1. Redistributions of source code must retain the above copyright notice,
    *      this list of conditions and the following disclaimer.
    *   2. Redistributions in binary form must reproduce the above copyright notice,
    *      this list of conditions and the following disclaimer in the documentation
    *      and/or other materials provided with the distribution.
    *   3. Neither the name of STMicroelectronics nor the names of its contributors
    *      may be used to endorse or promote products derived from this software
    *      without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
    * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    ******************************************************************************
    */
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32l0xx_hal.h"
  
  #ifdef HAL_PWR_MODULE_ENABLED
  /** @addtogroup STM32L0xx_HAL_Driver
    * @{
    */
  
  /** @addtogroup PWREx 
    * @{
    */
  
  /** @addtogroup PWREx_Private
    * @{
    */
  
  /** @defgroup PWR_Extended_TimeOut_Value PWREx Flag Setting Time Out Value
    * @{
    */ 
  #define PWR_FLAG_SETTING_DELAY_US 50
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  
  /** @addtogroup PWREx_Exported_Functions
    * @brief      Low Power modes configuration functions 
    *
  @verbatim
  
   ===============================================================================
                   ##### Peripheral extended features functions #####
   ===============================================================================
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Enables the Fast WakeUp from Ultra Low Power mode.
    * @note This bit works in conjunction with ULP bit. 
    *        Means, when ULP = 1 and FWU = 1 :VREFINT startup time is ignored when 
    *        exiting from low power mode.
    * @retval None
    */
  void HAL_PWREx_EnableFastWakeUp(void)
  {
    /* Enable the fast wake up */
    SET_BIT(PWR->CR, PWR_CR_FWU);
  }
  
  /**
    * @brief  Disables the Fast WakeUp from Ultra Low Power mode.
    * @retval None
    */
  void HAL_PWREx_DisableFastWakeUp(void)
  {
    /* Disable the fast wake up */
    CLEAR_BIT(PWR->CR, PWR_CR_FWU);
  }
  
  /**
    * @brief  Enables the Ultra Low Power mode
    * @retval None
    */
  void HAL_PWREx_EnableUltraLowPower(void)
  {
    /* Enable the Ultra Low Power mode */
    SET_BIT(PWR->CR, PWR_CR_ULP);
  }
  
  /**
    * @brief  Disables the Ultra Low Power mode
    * @retval None
    */
  void HAL_PWREx_DisableUltraLowPower(void)
  {
    /* Disable the Ultra Low Power mode */
    CLEAR_BIT(PWR->CR, PWR_CR_ULP);
  }
  
  /**
    * @brief  Enable the Low Power Run mode.
    * @note   Low power run mode can only be entered when VCORE is in range 2.
    *         In addition, the dynamic voltage scaling must not be used when Low
    *         power run mode is selected. Only Stop and Sleep modes with regulator
    *         configured in Low power mode is allowed when Low power run mode is 
    *         selected.
    * @note   The frequency of the system clock must be decreased to not exceed the
    *         frequency of RCC_MSIRANGE_1.
    * @note   In Low power run mode, all I/O pins keep the same state as in Run mode.
    * @retval None
    */
  void HAL_PWREx_EnableLowPowerRunMode(void)
  {
    /* Enters the Low Power Run mode */
    SET_BIT(PWR->CR, PWR_CR_LPSDSR);
    SET_BIT(PWR->CR, PWR_CR_LPRUN);
  }
  
  /**
    * @brief  Disable the Low Power Run mode.
    * @note  Before HAL_PWREx_DisableLowPowerRunMode() completion, the function checks that 
    *        REGLPF has been properly reset (otherwise, HAL_PWREx_DisableLowPowerRunMode 
    *        returns HAL_TIMEOUT status). The system clock frequency can then be
    *        increased above 2 MHz.   
    * @retval HAL_StatusTypeDef
    */
  HAL_StatusTypeDef HAL_PWREx_DisableLowPowerRunMode(void)
  {
    uint32_t wait_loop_index = 0;
    
    /* Exit the Low Power Run mode */
    CLEAR_BIT(PWR->CR, PWR_CR_LPRUN);
    CLEAR_BIT(PWR->CR, PWR_CR_LPSDSR);
    
    /* Wait until REGLPF is reset */
    wait_loop_index = (PWR_FLAG_SETTING_DELAY_US * (SystemCoreClock / 1000000));
  
    while ((wait_loop_index != 0) && (HAL_IS_BIT_SET(PWR->CSR, PWR_CSR_REGLPF)))
    {
      wait_loop_index--;
    }
  
    if (HAL_IS_BIT_SET(PWR->CSR, PWR_CSR_REGLPF))
    {
      return HAL_TIMEOUT;
    }
  
    return HAL_OK;
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  #endif /* HAL_PWR_MODULE_ENABLED */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  
  