/*******************************************************************************
* 函数名称: PWR_EnterSTOPMode
* 功能描述: 进入STOP模式.
* 输入参数: PWR_Regulator:STOP模式的校准状态。
*                    这个参数可以是下面的值之一:
*                       - PWR_Regulator_ON: 校准器开启的STOP模式
*                       - PWR_Regulator_LowPower: 在低功耗模式下带有校准器的STOP模式。
*                  - PWR_STOPEntry: 这个参数定义了STOP进入模式.
*                    这个参数可以是下面的值之一:
*                       - PWR_STOPEntry_WFI: 进入有WFI指令的STOP模式
*                       - PWR_STOPEntry_WFE: 进入有WFE指令的STOP模式
* 输出参数: 无
* 返回参数: 无
*******************************************************************************/
void PWR_EnterSTOPMode(u32 PWR_Regulator, u8 PWR_STOPEntry)
{
  u32 tmpreg = 0;

  /* Check the parameters [检查参数]*/
  assert_param(IS_PWR_REGULATOR(PWR_Regulator));
  assert_param(IS_PWR_STOP_ENTRY(PWR_STOPEntry));
  
  /* Select the regulator state in STOP mode [在停止模式选择校准状态]*/
  tmpreg = PWR->CR;

  /* Clear PDDS and LPDS bits [清PDDS和LPDS位]*/
  tmpreg &= CR_DS_Mask;

  /* Set LPDS bit according to PWR_Regulator value [依照PWR_Regulator值置位LPDS]*/
  tmpreg |= PWR_Regulator;

  /* Store the new value [保存新的值]*/
  PWR->CR = tmpreg;

  /* Set SLEEPDEEP bit of Cortex System Control Register [置位Cortex系统的控制寄存器SLEEPDEEP位]*/
  *(vu32 *) SCB_SysCtrl |= SysCtrl_SLEEPDEEP_Set;
  
  /* Select STOP mode entry [选择停止模式进入]*/
  if(PWR_STOPEntry == PWR_STOPEntry_WFI)
  {   
    /* Request Wait For Interrupt [请求等待中断]*/
    __WFI();
  }
  else
  {
    /* Request Wait For Event [请求等待事件]*/
    __WFE();
  }
}

/**
  * @brief Enter Stop 0 mode.
  * @note  In Stop 0 mode, main and low voltage regulators are ON.
  * @note  In Stop 0 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.
  * @note  When exiting Stop 0 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  By keeping the internal regulator ON during Stop 0 mode, the consumption
  *         is higher although the startup time is reduced.
  * @param STOPEntry  specifies if Stop mode in entered with WFI or WFE instruction.
  *          This parameter can be one of the following values:
  *            @arg @ref PWR_STOPENTRY_WFI  Enter Stop mode with WFI instruction
  *            @arg @ref PWR_STOPENTRY_WFE  Enter Stop mode with WFE instruction
  * @retval None
  */
void HAL_PWREx_EnterSTOP0Mode(uint8_t STOPEntry)
{
  /* Check the parameters */
  assert_param(IS_PWR_STOP_ENTRY(STOPEntry));
    
  /* Stop 0 mode with Main Regulator */
  MODIFY_REG(PWR->CR1, PWR_CR1_LPMS, PWR_CR1_LPMS_STOP0);

  /* Set SLEEPDEEP bit of Cortex System Control Register */
  SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));

  /* Select Stop mode entry --------------------------------------------------*/
  if(STOPEntry == PWR_STOPENTRY_WFI)
  {
    /* Request Wait For Interrupt */
    __WFI();
  }
  else
  {
    /* Request Wait For Event */
    __SEV();
    __WFE();
    __WFE();
  }

  /* Reset SLEEPDEEP bit of Cortex System Control Register */
  CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));
}

/**
  * @brief  Enters STOP mode.
  * @param  PWR_Regulator: specifies the regulator state in STOP mode.
  *   This parameter can be one of the following values:
  *     @arg PWR_Regulator_ON: STOP mode with regulator ON
  *     @arg PWR_Regulator_LowPower: STOP mode with regulator in low power mode
  * @param  PWR_STOPEntry: specifies if STOP mode in entered with WFI or WFE instruction.
  *   This parameter can be one of the following values:
  *     @arg PWR_STOPEntry_WFI: enter STOP mode with WFI instruction
  *     @arg PWR_STOPEntry_WFE: enter STOP mode with WFE instruction
  * @retval None
  */
void PWR_EnterSTOPMode(uint32_t PWR_Regulator, uint8_t PWR_STOPEntry)
{
  uint32_t tmpreg = 0;
  /* Check the parameters */
  assert_param(IS_PWR_REGULATOR(PWR_Regulator));
  assert_param(IS_PWR_STOP_ENTRY(PWR_STOPEntry));
  
  /* Select the regulator state in STOP mode ---------------------------------*/
  tmpreg = PWR->CR;
  /* Clear PDDS and LPDS bits */
  tmpreg &= CR_DS_Mask;
  /* Set LPDS bit according to PWR_Regulator value */
  tmpreg |= PWR_Regulator;
  /* Store the new value */
  PWR->CR = tmpreg;
  /* Set SLEEPDEEP bit of Cortex System Control Register */
  *(__IO uint32_t *) SCB_SysCtrl |= SysCtrl_SLEEPDEEP_Set;
  
  /* Select STOP mode entry --------------------------------------------------*/
  if(PWR_STOPEntry == PWR_STOPEntry_WFI)
  {   
    /* Request Wait For Interrupt */
    __WFI();
  }
  else
  {
    /* Request Wait For Event */
    __WFE();
  }
}

/**
  * @brief  Enters in Under-Drive STOP mode.
  * 
  * @note    This mode can be selected only when the Under-Drive is already active 
  *   
  * @note    This mode is enabled only with STOP low power mode.
  *          In this mode, the 1.2V domain is preserved in reduced leakage mode. This 
  *          mode is only available when the main regulator or the low power regulator 
  *          is in low voltage mode
  *        
  * @note   If the Under-drive mode was enabled, it is automatically disabled after 
  *         exiting Stop mode. 
  *         When the voltage regulator operates in Under-drive mode, an additional  
  *         startup delay is induced when waking up from Stop mode.
  *                    
  * @note   In Stop mode, all I/O pins keep the same state as in Run mode.
  *   
  * @note   When exiting Stop mode by issuing an interrupt or a wakeup event, 
  *         the HSI RC oscillator is selected as system clock.
  *           
  * @note   When the voltage regulator operates in low power mode, an additional 
  *         startup delay is incurred when waking up from Stop mode. 
  *         By keeping the internal regulator ON during Stop mode, 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 PWR_MAINREGULATOR_UNDERDRIVE_ON:  Main Regulator in under-drive mode 
  *                 and Flash memory in power-down when the device is in Stop under-drive mode
  *            @arg PWR_LOWPOWERREGULATOR_UNDERDRIVE_ON:  Low Power Regulator in under-drive mode 
  *                and Flash memory in power-down when the device is in Stop under-drive mode
  * @param  STOPEntry: specifies if STOP mode in entered with WFI or WFE instruction.
  *          This parameter can be one of the following values:
  *            @arg PWR_SLEEPENTRY_WFI: enter STOP mode with WFI instruction
  *            @arg PWR_SLEEPENTRY_WFE: enter STOP mode with WFE instruction
  * @retval None
  */
HAL_StatusTypeDef HAL_PWREx_EnterUnderDriveSTOPMode(uint32_t Regulator, uint8_t STOPEntry)
{
  uint32_t tempreg = 0;
  uint32_t tickstart = 0;
  
  /* Check the parameters */
  assert_param(IS_PWR_REGULATOR_UNDERDRIVE(Regulator));
  assert_param(IS_PWR_STOP_ENTRY(STOPEntry));
  
  /* Enable Power ctrl clock */
  __HAL_RCC_PWR_CLK_ENABLE();
  /* Enable the Under-drive Mode ---------------------------------------------*/
  /* Clear Under-drive flag */
  __HAL_PWR_CLEAR_ODRUDR_FLAG();
  
  /* Enable the Under-drive */ 
  __HAL_PWR_UNDERDRIVE_ENABLE();

  /* Get tick */
  tickstart = HAL_GetTick();

  /* Wait for UnderDrive mode is ready */
  while(__HAL_PWR_GET_FLAG(PWR_FLAG_UDRDY))
  {
    if((HAL_GetTick() - tickstart ) > PWR_UDERDRIVE_TIMEOUT_VALUE)
    {
      return HAL_TIMEOUT;
    }
  }
  
  /* Select the regulator state in STOP mode ---------------------------------*/
  tempreg = PWR->CR1;
  /* Clear PDDS, LPDS, MRLUDS and LPLUDS bits */
  tempreg &= (uint32_t)~(PWR_CR1_PDDS | PWR_CR1_LPDS | PWR_CR1_LPUDS | PWR_CR1_MRUDS);
  
  /* Set LPDS, MRLUDS and LPLUDS bits according to PWR_Regulator value */
  tempreg |= Regulator;
  
  /* Store the new value */
  PWR->CR1 = tempreg;
  
  /* Set SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
  
  /* Select STOP mode entry --------------------------------------------------*/
  if(STOPEntry == PWR_SLEEPENTRY_WFI)
  {   
    /* Request Wait For Interrupt */
    __WFI();
  }
  else
  {
    /* Request Wait For Event */
    __WFE();
  }
  /* Reset SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);

  return HAL_OK;  
}

/**
  * @brief Enters Stop mode. 
  * @note  In Stop mode, all I/O pins keep the same state as in Run mode.
  * @note  When exiting Stop mode by using an interrupt or a wakeup event,
  *        MSI RC oscillator is selected as system clock.
  * @note  When the voltage regulator operates in low power mode, an additional
  *         startup delay is incurred when waking up from Stop mode. 
  *         By keeping the internal regulator ON during Stop mode, 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 PWR_MAINREGULATOR_ON: Stop mode with regulator ON
  *            @arg PWR_LOWPOWERREGULATOR_ON: Stop mode with low power regulator ON
  * @param STOPEntry: Specifies if Stop mode in entered with WFI or WFE instruction.
  *          This parameter can be one of the following values:
  *            @arg PWR_STOPENTRY_WFI: Enter Stop mode with WFI instruction
  *            @arg PWR_STOPENTRY_WFE: Enter Stop 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));
  assert_param(IS_PWR_STOP_ENTRY(STOPEntry));

  /* Select the regulator state in Stop mode: Set PDDS and LPSDSR bit according to PWR_Regulator value */
  MODIFY_REG(PWR->CR, (PWR_CR_PDDS | PWR_CR_LPSDSR), Regulator);

  /* Set SLEEPDEEP bit of Cortex System Control Register */
  SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));

  /* Select Stop mode entry --------------------------------------------------*/
  if(STOPEntry == PWR_STOPENTRY_WFI)
  {
    /* Request Wait For Interrupt */
    __WFI();
  }
  else
  {
    /* Request Wait For Event */
    __SEV();
    __WFE();
    __WFE();
  }
  /* Reset SLEEPDEEP bit of Cortex System Control Register */
  CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));
}

/**
  * @brief Enters Stop mode. 
  * @note  In Stop mode, all I/O pins keep the same state as in Run mode.
  * @note  When exiting Stop mode by using an interrupt or a wakeup event,
  *        HSI RC oscillator is selected as system clock.
  * @note  When the voltage regulator operates in low power mode, an additional
  *         startup delay is incurred when waking up from Stop mode. 
  *         By keeping the internal regulator ON during Stop mode, 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 PWR_MAINREGULATOR_ON: Stop mode with regulator ON
  *            @arg PWR_LOWPOWERREGULATOR_ON: Stop mode with low power regulator ON
  * @param STOPEntry: Specifies if Stop mode in entered with WFI or WFE instruction.
  *          This parameter can be one of the following values:
  *            @arg PWR_STOPENTRY_WFI: Enter Stop mode with WFI instruction
  *            @arg PWR_STOPENTRY_WFE: Enter Stop 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));
  assert_param(IS_PWR_STOP_ENTRY(STOPEntry));

  /* Clear PDDS bit in PWR register to specify entering in STOP mode when CPU enter in Deepsleep */ 
  CLEAR_BIT(PWR->CR,  PWR_CR_PDDS);

  /* Select the voltage regulator mode by setting LPDS bit in PWR register according to Regulator parameter value */
  MODIFY_REG(PWR->CR, PWR_CR_LPDS, Regulator);

  /* Set SLEEPDEEP bit of Cortex System Control Register */
  SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));

  /* Select Stop mode entry --------------------------------------------------*/
  if(STOPEntry == PWR_STOPENTRY_WFI)
  {
    /* Request Wait For Interrupt */
    __WFI();
  }
  else
  {
    /* Request Wait For Event */
    __SEV();
    PWR_OverloadWfe(); /* WFE redefine locally */
    PWR_OverloadWfe(); /* WFE redefine locally */
  }
  /* Reset SLEEPDEEP bit of Cortex System Control Register */
  CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));
}

/**
  * @brief  Enter the system to STOP mode.
  * @note   In System Stop mode, all I/O pins keep the same state as in Run mode.
  * @note   When exiting System Stop mode by issuing an interrupt or a wakeup event,
  *         the HSI RC oscillator is selected as default system wakeup clock.
  * @note   In System STOP mode, when the voltage regulator operates in low power mode,
  *         an additional startup delay is incurred when the system is waking up.
  *         By keeping the internal regulator ON during Stop mode, 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 PWR_MAINREGULATOR_ON: Stop mode with regulator ON
  *            @arg PWR_LOWPOWERREGULATOR_ON: Stop mode with low power regulator ON
  * @param  STOPEntry: Specifies if Stop mode in entered with WFI or WFE instruction.
  *          This parameter can be one of the following values:
  *            @arg PWR_STOPENTRY_WFI: Enter Stop mode with WFI instruction
  *            @arg PWR_STOPENTRY_WFE: Enter Stop mode with WFE instruction
  * @retval None
  */
void HAL_PWR_EnterSTOPMode(uint32_t Regulator, uint8_t STOPEntry)
{
  uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_PWR_REGULATOR(Regulator));
  assert_param(IS_PWR_STOP_ENTRY(STOPEntry));

  /* Select the regulator state in Stop mode */
  tmpreg = PWR->CR1;
  /* Clear PDDS and LPDS bits */
  tmpreg &= (uint32_t)~(PWR_CR1_LPDS);

  /* Set LPDS bit according to Regulator value */
  tmpreg |= Regulator;

  /* Store the new value */
  PWR->CR1 = tmpreg;

  /* Keep DSTOP mode when D1 domain enters Deepsleep */
  CLEAR_BIT(PWR->CPUCR, PWR_CPUCR_PDDS_D1);

  /* Keep DSTOP mode when D2 domain enters Deepsleep */
  CLEAR_BIT(PWR->CPUCR, PWR_CPUCR_PDDS_D2);

  /* Keep DSTOP mode when D3 domain enters Deepsleep */
  CLEAR_BIT(PWR->CPUCR, PWR_CPUCR_PDDS_D3);

  /* Set SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;

  /* Ensure that all instructions done before entering STOP mode */
  __DSB();
  __ISB();

  /* Select Stop mode entry */
  if(STOPEntry == PWR_STOPENTRY_WFI)
  {
    /* Request Wait For Interrupt */
    __WFI();
  }
  else
  {
    /* Request Wait For Event */
    __SEV();
    __WFE();
    __WFE();
  }
  /* Reset SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);
}

/**
  * @brief  Enters STOP mode.
  * @param  PWR_Regulator: specifies the regulator state in STOP mode.
  *   This parameter can be one of the following values:
  *     @arg PWR_Regulator_ON: STOP mode with regulator ON
  *     @arg PWR_Regulator_LowPower: STOP mode with regulator in low power mode
  * @param  PWR_STOPEntry: specifies if STOP mode in entered with WFI or WFE instruction.
  *   This parameter can be one of the following values:
  *     @arg PWR_STOPEntry_WFI: enter STOP mode with WFI instruction
  *     @arg PWR_STOPEntry_WFE: enter STOP mode with WFE instruction
  * @retval None
  */
void PWR_EnterSTOPMode(uint32_t PWR_Regulator, uint8_t PWR_STOPEntry)
{
	
#ifdef	OS_UCOS
	OS_CPU_SR  cpu_sr;
#endif
	

  uint32_t tmpreg = 0;
	
#ifdef	OS_UCOS
	OS_ENTER_CRITICAL();
#endif
	 
  /* Check the parameters */
  assert_param(IS_PWR_REGULATOR(PWR_Regulator));
  assert_param(IS_PWR_STOP_ENTRY(PWR_STOPEntry));
  
  /* Select the regulator state in STOP mode ---------------------------------*/
  tmpreg = PWR->CR;
  /* Clear PDDS and LPDS bits */
  tmpreg &= CR_DS_MASK;
  /* Set LPDS bit according to PWR_Regulator value */
  tmpreg |= PWR_Regulator;
  /* Store the new value */
  PWR->CR = tmpreg;
  /* Set SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR |= SCB_SCR_SLEEPDEEP;
  
  /* Select STOP mode entry --------------------------------------------------*/
  if(PWR_STOPEntry == PWR_STOPEntry_WFI)
  {   
    /* Request Wait For Interrupt */
    __WFI();
  }
  else
  {
    /* Request Wait For Event */
    __WFE();
  }
  
  /* Reset SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP);  
	
#ifdef	OS_UCOS
	OS_EXIT_CRITICAL();
#endif
	
}

/**
  * @brief  Enters STOP mode.
  * @note   In Stop mode, all I/O pins keep the same state as in Run mode.
  * @note   When exiting Stop mode by issuing an interrupt or a wakeup event, 
  *         the HSI RC oscillator is selected as system clock.
  * @note   When the voltage regulator operates in low power mode, an additional 
  *         startup delay is incurred when waking up from Stop mode. 
  *         By keeping the internal regulator ON during Stop mode, the consumption 
  *         is higher although the startup time is reduced.
  * @param  PWR_Regulator: specifies the regulator state in STOP mode.
  *         This parameter can be one of the following values:
  *             @arg PWR_Regulator_ON: STOP mode with regulator ON
  *             @arg PWR_Regulator_LowPower: STOP mode with regulator in low power mode
  * @param  PWR_STOPEntry: specifies if STOP mode in entered with WFI or WFE instruction.
  *         This parameter can be one of the following values:
  *             @arg PWR_STOPEntry_WFI: enter STOP mode with WFI instruction
  *             @arg PWR_STOPEntry_WFE: enter STOP mode with WFE instruction
                @arg PWR_STOPEntry_SLEEPONEXIT: enter STOP mode with SLEEPONEXIT instruction
  * @retval None
  */
void PWR_EnterSTOPMode(uint32_t PWR_Regulator, uint8_t PWR_STOPEntry)
{
  uint32_t tmpreg = 0;
  
  /* Check the parameters */
  assert_param(IS_PWR_REGULATOR(PWR_Regulator));
  assert_param(IS_PWR_STOP_ENTRY(PWR_STOPEntry));
  
  /* Select the regulator state in STOP mode ---------------------------------*/
  tmpreg = PWR->CR;
  /* Clear PDDS and LPDSR bits */
  tmpreg &= CR_DS_MASK;
  
  /* Set LPDSR bit according to PWR_Regulator value */
  tmpreg |= PWR_Regulator;
  
  /* Store the new value */
  PWR->CR = tmpreg;
  
  /* Set SLEEPDEEP bit of Cortex-M0 System Control Register */
  SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
  
  /* Select STOP mode entry --------------------------------------------------*/
  if(PWR_STOPEntry == PWR_STOPEntry_WFI)
  {
    /* Request Wait For Interrupt */
    __WFI();
    /* Reset SLEEPDEEP bit of Cortex System Control Register */
    SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk); 
  }
  else if (PWR_STOPEntry == PWR_STOPEntry_WFE)
  {
    /* Request Wait For Event */
    __WFE();
    /* Reset SLEEPDEEP bit of Cortex System Control Register */
    SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);   
  }
  else
  {
    /* Set SLEEP on exit bit of Cortex-M0 System Control Register */
    SCB->SCR |= SCB_SCR_SLEEPONEXIT_Msk;
  }
}

/**
  * @brief Enters STOP mode.
  * @note  In Stop mode, all I/O pins keep the same state as in Run mode.
  * @note  When exiting Stop mode by issuing an interrupt or a wakeup event,
  *         the HSI RC oscillator is selected as system clock.
  * @note  When the voltage regulator operates in low power mode, an additional
  *         startup delay is incurred when waking up from Stop mode.
  *         By keeping the internal regulator ON during Stop mode, 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 PWR_MAINREGULATOR_ON: STOP mode with regulator ON
  *            @arg PWR_LOWPOWERREGULATOR_ON: STOP mode with low power regulator ON
  * @param STOPEntry: specifies if STOP mode in entered with WFI or WFE instruction.
  *          This parameter can be one of the following values:
  *            @arg PWR_STOPENTRY_WFI:Enter STOP mode with WFI instruction
  *            @arg PWR_STOPENTRY_WFE: Enter STOP mode with WFE instruction
  * @retval None
  */
void HAL_PWR_EnterSTOPMode(uint32_t Regulator, uint8_t STOPEntry)
{
  uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_PWR_REGULATOR(Regulator));
  assert_param(IS_PWR_STOP_ENTRY(STOPEntry));

  /* Select the regulator state in STOP mode ---------------------------------*/
  tmpreg = PWR->CR;
  
  /* Clear PDDS and LPDS bits */
  tmpreg &= (uint32_t)~(PWR_CR_PDDS | PWR_CR_LPDS);

  /* Set LPDS bit according to Regulator value */
  tmpreg |= Regulator;

  /* Store the new value */
  PWR->CR = tmpreg;

  /* Set SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;

  /* Select STOP mode entry --------------------------------------------------*/
  if(STOPEntry == PWR_STOPENTRY_WFI)
  {
    /* Request Wait For Interrupt */
    __WFI();
  }
  else
  {
    /* Request Wait For Event */
    __SEV();
    __WFE();
    __WFE();
  }

  /* Reset SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);
}