stm32f4xx_pwr.c

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/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_pwr.h"
#include "stm32f4xx_rcc.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* --------- PWR registers bit address in the alias region ---------- */
#define PWR_OFFSET               (PWR_BASE - PERIPH_BASE)

/* --- CR Register ---*/

/* Alias word address of DBP bit */
#define CR_OFFSET                (PWR_OFFSET + 0x00)
#define DBP_BitNumber            0x08
#define CR_DBP_BB                (PERIPH_BB_BASE + (CR_OFFSET * 32) + (DBP_BitNumber * 4))

/* Alias word address of PVDE bit */
#define PVDE_BitNumber           0x04
#define CR_PVDE_BB               (PERIPH_BB_BASE + (CR_OFFSET * 32) + (PVDE_BitNumber * 4))

/* Alias word address of FPDS bit */
#define FPDS_BitNumber           0x09
#define CR_FPDS_BB               (PERIPH_BB_BASE + (CR_OFFSET * 32) + (FPDS_BitNumber * 4))

/* Alias word address of PMODE bit */
#define PMODE_BitNumber           0x0E
#define CR_PMODE_BB               (PERIPH_BB_BASE + (CR_OFFSET * 32) + (PMODE_BitNumber * 4))


/* --- CSR Register ---*/

/* Alias word address of EWUP bit */
#define CSR_OFFSET               (PWR_OFFSET + 0x04)
#define EWUP_BitNumber           0x08
#define CSR_EWUP_BB              (PERIPH_BB_BASE + (CSR_OFFSET * 32) + (EWUP_BitNumber * 4))

/* Alias word address of BRE bit */
#define BRE_BitNumber            0x09
#define CSR_BRE_BB              (PERIPH_BB_BASE + (CSR_OFFSET * 32) + (BRE_BitNumber * 4))

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

/* CR register bit mask */
#define CR_DS_MASK               ((uint32_t)0xFFFFFFFC)
#define CR_PLS_MASK              ((uint32_t)0xFFFFFF1F)
#define CR_VOS_MASK              ((uint32_t)0xFFFF3FFF)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

void PWR_DeInit(void)
{
  RCC_APB1PeriphResetCmd(RCC_APB1Periph_PWR, ENABLE);
  RCC_APB1PeriphResetCmd(RCC_APB1Periph_PWR, DISABLE);
}

void PWR_BackupAccessCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  
  *(__IO uint32_t *) CR_DBP_BB = (uint32_t)NewState;
}

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 */
  tmpreg &= CR_PLS_MASK;
  
  /* Set PLS[7:5] bits according to PWR_PVDLevel value */
  tmpreg |= PWR_PVDLevel;
  
  /* Store the new value */
  PWR->CR = tmpreg;
}

void PWR_PVDCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  
  *(__IO uint32_t *) CR_PVDE_BB = (uint32_t)NewState;
}

void PWR_WakeUpPinCmd(FunctionalState NewState)
{
  /* Check the parameters */  
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  *(__IO uint32_t *) CSR_EWUP_BB = (uint32_t)NewState;
}

void PWR_BackupRegulatorCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  *(__IO uint32_t *) CSR_BRE_BB = (uint32_t)NewState;
}

void PWR_MainRegulatorModeConfig(uint32_t PWR_Regulator_Voltage)
{
        uint32_t tmpreg = 0;
        
  /* Check the parameters */
  assert_param(IS_PWR_REGULATOR_VOLTAGE(PWR_Regulator_Voltage));

  tmpreg = PWR->CR;
  
  /* Clear VOS[15:14] bits */
  tmpreg &= CR_VOS_MASK;
  
  /* Set VOS[15:14] bits according to PWR_Regulator_Voltage value */
  tmpreg |= PWR_Regulator_Voltage;
  
  /* Store the new value */
  PWR->CR = tmpreg;
}

void PWR_FlashPowerDownCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  *(__IO uint32_t *) CR_FPDS_BB = (uint32_t)NewState;
}

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 System Control Register */
  SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
  
  /* 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_Msk);  
}

void PWR_EnterSTANDBYMode(void)
{
  /* Clear Wakeup flag */
  PWR->CR |= PWR_CR_CWUF;
  
  /* Select STANDBY mode */
  PWR->CR |= PWR_CR_PDDS;
  
  /* Set SLEEPDEEP bit of Cortex System Control Register */
  SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
  
/* This option is used to ensure that store operations are completed */
#if defined ( __CC_ARM   )
  __force_stores();
#endif
  /* Request Wait For Interrupt */
  __WFI();
}

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;
}

void PWR_ClearFlag(uint32_t PWR_FLAG)
{
  /* Check the parameters */
  assert_param(IS_PWR_CLEAR_FLAG(PWR_FLAG));
         
  PWR->CR |=  PWR_FLAG << 2;
}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/