rt-thread/bsp/ft32/libraries/FT32F0xx/FT32F0xx_Driver/Src/ft32f0xx_pwr.c

/**
  ******************************************************************************
  * @file               ft32f0xx_pwr.c
  * @author             FMD AE
  * @brief              This file provides firmware functions to manage the following
  *                     functionalities of the Power Controller (PWR) peripheral:
  *                 + Backup Domain Access
  *                 + PVD configuration
  *                 + WakeUp pins configuration
  *                 + Low Power modes configuration
  *                 + Flags management
  * @version            V1.0.0
  * @data                   2021-07-01
    ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "ft32f0xx_pwr.h"
#include "ft32f0xx_rcc.h"


/* ------------------ PWR registers bit mask ------------------------ */

/* CR register bit mask */
#define CR_DS_MASK               ((uint32_t)0xFFFFFFFC)
#define CR_PLS_MASK              ((uint32_t)0xFFFFFD1F)


/**
  * @brief  Deinitializes the PWR peripheral registers to their default reset values.
  * @param  None
  * @retval None
  */
void PWR_DeInit(void)
{
  RCC_APB1PeriphResetCmd(RCC_APB1Periph_PWR, ENABLE);
  RCC_APB1PeriphResetCmd(RCC_APB1Periph_PWR, DISABLE);
}

/**
  * @brief  Enables or disables access to the Backup domain registers.
  * @note   If the HSE divided by 32 is used as the RTC clock, the
  *         Backup Domain Access should be kept enabled.
  * @param  NewState: new state of the access to the Backup domain registers.
  *          This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void PWR_BackupAccessCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the Backup Domain Access */
    PWR->CR |= PWR_CR_DBP;
  }
  else
  {
    /* Disable the Backup Domain Access */
    PWR->CR &= (uint32_t)~((uint32_t)PWR_CR_DBP);
  }
}

/**
  * @}
  */

/**
  * @brief  Configures the voltage threshold detected by the Power Voltage Detector(PVD).
  * @param  PWR_PVDLevel: specifies the PVD detection level
  *          This parameter can be one of the following values:
  *             @arg PWR_PVDLevel_0
  *             @arg PWR_PVDLevel_1
  *             @arg PWR_PVDLevel_2
  *             @arg PWR_PVDLevel_3
  *             @arg PWR_PVDLevel_4
  *             @arg PWR_PVDLevel_5
  *             @arg PWR_PVDLevel_6
  *             @arg PWR_PVDLevel_7
  *             @arg PWR_PVDLevel_8
  *             @arg PWR_PVDLevel_9
  *             @arg PWR_PVDLevel_10
  *             @arg PWR_PVDLevel_11
  *             @arg PWR_PVDLevel_12
  *             @arg PWR_PVDLevel_13
  *             @arg PWR_PVDLevel_14
  *             @arg PWR_PVDLevel_15
  * @note   Refer to the electrical characteristics of your device datasheet for
  *         more details about the voltage threshold corresponding to each
  *         detection level.
  * @retval None
  */
void PWR_PVDLevelConfig(uint32_t PWR_PVDLevel)
{
  uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_PWR_PVD_LEVEL(PWR_PVDLevel));

  tmpreg = PWR->CR;

  /* Clear PLS[7:5] bits  PLS3*/
  tmpreg &= CR_PLS_MASK;

  /* Set PLS[7:5] and PLS3 bits according to PWR_PVDLevel value */
  tmpreg |= PWR_PVDLevel;

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

/**
  * @brief  Enables or disables the Power Voltage Detector(PVD).
  * @param  NewState: new state of the PVD.
  *          This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void PWR_PVDCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the PVD */
    PWR->CR |= PWR_CR_PVDE;
  }
  else
  {
    /* Disable the PVD */
    PWR->CR &= (uint32_t)~((uint32_t)PWR_CR_PVDE);
  }
}

/**
  * @}
  */
/**
  * @brief  Enables or disables the WakeUp Pin functionality.
  * @param  PWR_WakeUpPin: specifies the WakeUpPin.
  *          This parameter can be one of the following values
  *             @arg PWR_WakeUpPin_1
  *             @arg PWR_WakeUpPin_2
  *             @arg PWR_WakeUpPin_3
  *             @arg PWR_WakeUpPin_4
  *             @arg PWR_WakeUpPin_5
  *             @arg PWR_WakeUpPin_6
  *             @arg PWR_WakeUpPin_7
  *             @arg PWR_WakeUpPin_8
  * @param  NewState: new state of the WakeUp Pin functionality.
  *          This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void PWR_WakeUpPinCmd(uint32_t PWR_WakeUpPin, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_PWR_WAKEUP_PIN(PWR_WakeUpPin));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the EWUPx pin */
    PWR->CSR |= PWR_WakeUpPin;
  }
  else
  {
    /* Disable the EWUPx pin */
    PWR->CSR &= ~PWR_WakeUpPin;
  }
}

/**
  * @}
  */

/**
  * @brief  Enters Sleep mode.
  * @note   In Sleep mode, all I/O pins keep the same state as in Run mode.
  * @param  PWR_SLEEPEntry: specifies if SLEEP mode in entered with WFI or WFE instruction.
  *          This parameter can be one of the following values:
  *             @arg PWR_SLEEPEntry_WFI: enter SLEEP mode with WFI instruction
  *             @arg PWR_SLEEPEntry_WFE: enter SLEEP mode with WFE instruction
  * @retval None
  */
void PWR_EnterSleepMode(uint8_t PWR_SLEEPEntry)
{
  /* Check the parameters */
  assert_param(IS_PWR_SLEEP_ENTRY(PWR_SLEEPEntry));

  /* Clear SLEEPDEEP bit of Cortex-M0 System Control Register */
  SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);

  /* Select SLEEP mode entry -------------------------------------------------*/
  if(PWR_SLEEPEntry == PWR_SLEEPEntry_WFI)
  {
    /* Request Wait For Interrupt */
    __WFI();
  }
  else
  {
    /* Request Wait For Event */
    __SEV();
    __WFE();
    __WFE();
  }
}

/**
  * @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 STANDBY mode.
  * @note   In Standby mode, all I/O pins are high impedance except for:
  *          - Reset pad (still available)
  *          - RTC_AF1 pin (PC13) if configured for Wakeup pin 2 (WKUP2), tamper,
  *             time-stamp, RTC Alarm out, or RTC clock calibration out.
  *          - WKUP pin 1 (PA0) if enabled.
  * @note The Wakeup flag (WUF) need to be cleared at application level before to call this function
  * @param  None
  * @retval None
  */
void PWR_EnterSTANDBYMode(void)
{
  /* Select STANDBY mode */
  PWR->CR |= PWR_CR_PDDS;

  /* Set SLEEPDEEP bit of Cortex-M0 System Control Register */
  SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;

  /* Request Wait For Interrupt */
  __WFI();
}

/**
  * @}
  */

/**
  * @brief  Checks whether the specified PWR flag is set or not.
  * @param  PWR_FLAG: specifies the flag to check.
  *          This parameter can be one of the following values:
  *             @arg PWR_FLAG_WU: Wake Up flag. This flag indicates that a wakeup
  *                  event was received from the WKUP pin or from the RTC alarm
  *                  (Alarm A or Alarm B), RTC Tamper event or RTC TimeStamp event.
  *             @arg PWR_FLAG_SB: StandBy flag. This flag indicates that the
  *                  system was resumed from StandBy mode.
  *             @arg PWR_FLAG_PVDO: PVD Output. This flag is valid only if PVD
  *                  is enabled by the PWR_PVDCmd() function.
  *             @arg PWR_FLAG_VREFINTRDY: Internal Voltage Reference Ready flag.
  *                  This flag indicates the state of the internal voltage
  *                  reference, VREFINT.
  * @retval The new state of PWR_FLAG (SET or RESET).
  */
FlagStatus PWR_GetFlagStatus(uint32_t PWR_FLAG)
{
  FlagStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_PWR_GET_FLAG(PWR_FLAG));

  if ((PWR->CSR & PWR_FLAG) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  /* Return the flag status */
  return bitstatus;
}

/**
  * @brief  Clears the PWR's pending flags.
  * @param  PWR_FLAG: specifies the flag to clear.
  *          This parameter can be one of the following values:
  *             @arg PWR_FLAG_WU: Wake Up flag
  *             @arg PWR_FLAG_SB: StandBy flag
  * @retval None
  */
void PWR_ClearFlag(uint32_t PWR_FLAG)
{
  /* Check the parameters */
  assert_param(IS_PWR_CLEAR_FLAG(PWR_FLAG));

  PWR->CR |=  PWR_FLAG << 2;
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

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