STM32F4xx_StdPeriph_Driver/src/stm32f4xx_rcc.c

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

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* ------------ RCC registers bit address in the alias region ----------- */
#define RCC_OFFSET                (RCC_BASE - PERIPH_BASE)
/* --- CR Register ---*/
/* Alias word address of HSION bit */
#define CR_OFFSET                 (RCC_OFFSET + 0x00)
#define HSION_BitNumber           0x00
#define CR_HSION_BB               (PERIPH_BB_BASE + (CR_OFFSET * 32) + (HSION_BitNumber * 4))
/* Alias word address of CSSON bit */
#define CSSON_BitNumber           0x13
#define CR_CSSON_BB               (PERIPH_BB_BASE + (CR_OFFSET * 32) + (CSSON_BitNumber * 4))
/* Alias word address of PLLON bit */
#define PLLON_BitNumber           0x18
#define CR_PLLON_BB               (PERIPH_BB_BASE + (CR_OFFSET * 32) + (PLLON_BitNumber * 4))
/* Alias word address of PLLI2SON bit */
#define PLLI2SON_BitNumber        0x1A
#define CR_PLLI2SON_BB            (PERIPH_BB_BASE + (CR_OFFSET * 32) + (PLLI2SON_BitNumber * 4))

/* --- CFGR Register ---*/
/* Alias word address of I2SSRC bit */
#define CFGR_OFFSET               (RCC_OFFSET + 0x08)
#define I2SSRC_BitNumber          0x17
#define CFGR_I2SSRC_BB            (PERIPH_BB_BASE + (CFGR_OFFSET * 32) + (I2SSRC_BitNumber * 4))

/* --- BDCR Register ---*/
/* Alias word address of RTCEN bit */
#define BDCR_OFFSET               (RCC_OFFSET + 0x70)
#define RTCEN_BitNumber           0x0F
#define BDCR_RTCEN_BB             (PERIPH_BB_BASE + (BDCR_OFFSET * 32) + (RTCEN_BitNumber * 4))
/* Alias word address of BDRST bit */
#define BDRST_BitNumber           0x10
#define BDCR_BDRST_BB             (PERIPH_BB_BASE + (BDCR_OFFSET * 32) + (BDRST_BitNumber * 4))

/* --- CSR Register ---*/
/* Alias word address of LSION bit */
#define CSR_OFFSET                (RCC_OFFSET + 0x74)
#define LSION_BitNumber           0x00
#define CSR_LSION_BB              (PERIPH_BB_BASE + (CSR_OFFSET * 32) + (LSION_BitNumber * 4))

/* --- DCKCFGR Register ---*/
/* Alias word address of TIMPRE bit */
#define DCKCFGR_OFFSET            (RCC_OFFSET + 0x8C)
#define TIMPRE_BitNumber          0x18
#define DCKCFGR_TIMPRE_BB         (PERIPH_BB_BASE + (DCKCFGR_OFFSET * 32) + (TIMPRE_BitNumber * 4))
/* ---------------------- RCC registers bit mask ------------------------ */
/* CFGR register bit mask */
#define CFGR_MCO2_RESET_MASK      ((uint32_t)0x07FFFFFF)
#define CFGR_MCO1_RESET_MASK      ((uint32_t)0xF89FFFFF)

/* RCC Flag Mask */
#define FLAG_MASK                 ((uint8_t)0x1F)

/* CR register byte 3 (Bits[23:16]) base address */
#define CR_BYTE3_ADDRESS          ((uint32_t)0x40023802)

/* CIR register byte 2 (Bits[15:8]) base address */
#define CIR_BYTE2_ADDRESS         ((uint32_t)(RCC_BASE + 0x0C + 0x01))

/* CIR register byte 3 (Bits[23:16]) base address */
#define CIR_BYTE3_ADDRESS         ((uint32_t)(RCC_BASE + 0x0C + 0x02))

/* BDCR register base address */
#define BDCR_ADDRESS              (PERIPH_BASE + BDCR_OFFSET)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static __I uint8_t APBAHBPrescTable[16] = {0, 0, 0, 0, 1, 2, 3, 4, 1, 2, 3, 4, 6, 7, 8, 9};

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

void RCC_DeInit(void)
{
  /* Set HSION bit */
  RCC->CR |= (uint32_t)0x00000001;

  /* Reset CFGR register */
  RCC->CFGR = 0x00000000;

  /* Reset HSEON, CSSON, PLLON and PLLI2S bits */
  RCC->CR &= (uint32_t)0xFAF6FFFF;

  /* Reset PLLCFGR register */
  RCC->PLLCFGR = 0x24003010;

  /* Reset PLLI2SCFGR register */
  RCC->PLLI2SCFGR = 0x20003000;

  /* Reset HSEBYP bit */
  RCC->CR &= (uint32_t)0xFFFBFFFF;

  /* Disable all interrupts */
  RCC->CIR = 0x00000000;

#ifdef STM32F427X 
  /* Disable Timers clock prescalers selection */
  RCC->DCKCFGR = 0x00000000;
#endif /* STM32F427X */ 

}

void RCC_HSEConfig(uint8_t RCC_HSE)
{
  /* Check the parameters */
  assert_param(IS_RCC_HSE(RCC_HSE));

  /* Reset HSEON and HSEBYP bits before configuring the HSE ------------------*/
  *(__IO uint8_t *) CR_BYTE3_ADDRESS = RCC_HSE_OFF;

  /* Set the new HSE configuration -------------------------------------------*/
  *(__IO uint8_t *) CR_BYTE3_ADDRESS = RCC_HSE;
}

ErrorStatus RCC_WaitForHSEStartUp(void)
{
  __IO uint32_t startupcounter = 0;
  ErrorStatus status = ERROR;
  FlagStatus hsestatus = RESET;
  /* Wait till HSE is ready and if Time out is reached exit */
  do
  {
    hsestatus = RCC_GetFlagStatus(RCC_FLAG_HSERDY);
    startupcounter++;
  } while((startupcounter != HSE_STARTUP_TIMEOUT) && (hsestatus == RESET));

  if (RCC_GetFlagStatus(RCC_FLAG_HSERDY) != RESET)
  {
    status = SUCCESS;
  }
  else
  {
    status = ERROR;
  }
  return (status);
}

void RCC_AdjustHSICalibrationValue(uint8_t HSICalibrationValue)
{
  uint32_t tmpreg = 0;
  /* Check the parameters */
  assert_param(IS_RCC_CALIBRATION_VALUE(HSICalibrationValue));

  tmpreg = RCC->CR;

  /* Clear HSITRIM[4:0] bits */
  tmpreg &= ~RCC_CR_HSITRIM;

  /* Set the HSITRIM[4:0] bits according to HSICalibrationValue value */
  tmpreg |= (uint32_t)HSICalibrationValue << 3;

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

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

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

void RCC_LSEConfig(uint8_t RCC_LSE)
{
  /* Check the parameters */
  assert_param(IS_RCC_LSE(RCC_LSE));

  /* Reset LSEON and LSEBYP bits before configuring the LSE ------------------*/
  /* Reset LSEON bit */
  *(__IO uint8_t *) BDCR_ADDRESS = RCC_LSE_OFF;

  /* Reset LSEBYP bit */
  *(__IO uint8_t *) BDCR_ADDRESS = RCC_LSE_OFF;

  /* Configure LSE (RCC_LSE_OFF is already covered by the code section above) */
  switch (RCC_LSE)
  {
    case RCC_LSE_ON:
      /* Set LSEON bit */
      *(__IO uint8_t *) BDCR_ADDRESS = RCC_LSE_ON;
      break;
    case RCC_LSE_Bypass:
      /* Set LSEBYP and LSEON bits */
      *(__IO uint8_t *) BDCR_ADDRESS = RCC_LSE_Bypass | RCC_LSE_ON;
      break;
    default:
      break;
  }
}

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

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

void RCC_PLLConfig(uint32_t RCC_PLLSource, uint32_t PLLM, uint32_t PLLN, uint32_t PLLP, uint32_t PLLQ)
{
  /* Check the parameters */
  assert_param(IS_RCC_PLL_SOURCE(RCC_PLLSource));
  assert_param(IS_RCC_PLLM_VALUE(PLLM));
  assert_param(IS_RCC_PLLN_VALUE(PLLN));
  assert_param(IS_RCC_PLLP_VALUE(PLLP));
  assert_param(IS_RCC_PLLQ_VALUE(PLLQ));

  RCC->PLLCFGR = PLLM | (PLLN << 6) | (((PLLP >> 1) -1) << 16) | (RCC_PLLSource) |
                 (PLLQ << 24);
}

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

void RCC_PLLI2SConfig(uint32_t PLLI2SN, uint32_t PLLI2SR)
{
  /* Check the parameters */
  assert_param(IS_RCC_PLLI2SN_VALUE(PLLI2SN));
  assert_param(IS_RCC_PLLI2SR_VALUE(PLLI2SR));

  RCC->PLLI2SCFGR = (PLLI2SN << 6) | (PLLI2SR << 28);
}

void RCC_PLLI2SCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  *(__IO uint32_t *) CR_PLLI2SON_BB = (uint32_t)NewState;
}

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

void RCC_MCO1Config(uint32_t RCC_MCO1Source, uint32_t RCC_MCO1Div)
{
  uint32_t tmpreg = 0;
  
  /* Check the parameters */
  assert_param(IS_RCC_MCO1SOURCE(RCC_MCO1Source));
  assert_param(IS_RCC_MCO1DIV(RCC_MCO1Div));  

  tmpreg = RCC->CFGR;

  /* Clear MCO1[1:0] and MCO1PRE[2:0] bits */
  tmpreg &= CFGR_MCO1_RESET_MASK;

  /* Select MCO1 clock source and prescaler */
  tmpreg |= RCC_MCO1Source | RCC_MCO1Div;

  /* Store the new value */
  RCC->CFGR = tmpreg;  
}

void RCC_MCO2Config(uint32_t RCC_MCO2Source, uint32_t RCC_MCO2Div)
{
  uint32_t tmpreg = 0;
  
  /* Check the parameters */
  assert_param(IS_RCC_MCO2SOURCE(RCC_MCO2Source));
  assert_param(IS_RCC_MCO2DIV(RCC_MCO2Div));
  
  tmpreg = RCC->CFGR;
  
  /* Clear MCO2 and MCO2PRE[2:0] bits */
  tmpreg &= CFGR_MCO2_RESET_MASK;

  /* Select MCO2 clock source and prescaler */
  tmpreg |= RCC_MCO2Source | RCC_MCO2Div;

  /* Store the new value */
  RCC->CFGR = tmpreg;  
}

void RCC_SYSCLKConfig(uint32_t RCC_SYSCLKSource)
{
  uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_RCC_SYSCLK_SOURCE(RCC_SYSCLKSource));

  tmpreg = RCC->CFGR;

  /* Clear SW[1:0] bits */
  tmpreg &= ~RCC_CFGR_SW;

  /* Set SW[1:0] bits according to RCC_SYSCLKSource value */
  tmpreg |= RCC_SYSCLKSource;

  /* Store the new value */
  RCC->CFGR = tmpreg;
}

uint8_t RCC_GetSYSCLKSource(void)
{
  return ((uint8_t)(RCC->CFGR & RCC_CFGR_SWS));
}

void RCC_HCLKConfig(uint32_t RCC_SYSCLK)
{
  uint32_t tmpreg = 0;
  
  /* Check the parameters */
  assert_param(IS_RCC_HCLK(RCC_SYSCLK));

  tmpreg = RCC->CFGR;

  /* Clear HPRE[3:0] bits */
  tmpreg &= ~RCC_CFGR_HPRE;

  /* Set HPRE[3:0] bits according to RCC_SYSCLK value */
  tmpreg |= RCC_SYSCLK;

  /* Store the new value */
  RCC->CFGR = tmpreg;
}


void RCC_PCLK1Config(uint32_t RCC_HCLK)
{
  uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_RCC_PCLK(RCC_HCLK));

  tmpreg = RCC->CFGR;

  /* Clear PPRE1[2:0] bits */
  tmpreg &= ~RCC_CFGR_PPRE1;

  /* Set PPRE1[2:0] bits according to RCC_HCLK value */
  tmpreg |= RCC_HCLK;

  /* Store the new value */
  RCC->CFGR = tmpreg;
}

void RCC_PCLK2Config(uint32_t RCC_HCLK)
{
  uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_RCC_PCLK(RCC_HCLK));

  tmpreg = RCC->CFGR;

  /* Clear PPRE2[2:0] bits */
  tmpreg &= ~RCC_CFGR_PPRE2;

  /* Set PPRE2[2:0] bits according to RCC_HCLK value */
  tmpreg |= RCC_HCLK << 3;

  /* Store the new value */
  RCC->CFGR = tmpreg;
}

void RCC_GetClocksFreq(RCC_ClocksTypeDef* RCC_Clocks)
{
  uint32_t tmp = 0, presc = 0, pllvco = 0, pllp = 2, pllsource = 0, pllm = 2;

  /* Get SYSCLK source -------------------------------------------------------*/
  tmp = RCC->CFGR & RCC_CFGR_SWS;

  switch (tmp)
  {
    case 0x00:  /* HSI used as system clock source */
      RCC_Clocks->SYSCLK_Frequency = HSI_VALUE;
      break;
    case 0x04:  /* HSE used as system clock  source */
      RCC_Clocks->SYSCLK_Frequency = HSE_VALUE;
      break;
    case 0x08:  /* PLL used as system clock  source */

      /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLLM) * PLLN
         SYSCLK = PLL_VCO / PLLP
         */    
      pllsource = (RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) >> 22;
      pllm = RCC->PLLCFGR & RCC_PLLCFGR_PLLM;
      
      if (pllsource != 0)
      {
        /* HSE used as PLL clock source */
        pllvco = (HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6);
      }
      else
      {
        /* HSI used as PLL clock source */
        pllvco = (HSI_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6);      
      }

      pllp = (((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) >>16) + 1 ) *2;
      RCC_Clocks->SYSCLK_Frequency = pllvco/pllp;
      break;
    default:
      RCC_Clocks->SYSCLK_Frequency = HSI_VALUE;
      break;
  }
  /* Compute HCLK, PCLK1 and PCLK2 clocks frequencies ------------------------*/

  /* Get HCLK prescaler */
  tmp = RCC->CFGR & RCC_CFGR_HPRE;
  tmp = tmp >> 4;
  presc = APBAHBPrescTable[tmp];
  /* HCLK clock frequency */
  RCC_Clocks->HCLK_Frequency = RCC_Clocks->SYSCLK_Frequency >> presc;

  /* Get PCLK1 prescaler */
  tmp = RCC->CFGR & RCC_CFGR_PPRE1;
  tmp = tmp >> 10;
  presc = APBAHBPrescTable[tmp];
  /* PCLK1 clock frequency */
  RCC_Clocks->PCLK1_Frequency = RCC_Clocks->HCLK_Frequency >> presc;

  /* Get PCLK2 prescaler */
  tmp = RCC->CFGR & RCC_CFGR_PPRE2;
  tmp = tmp >> 13;
  presc = APBAHBPrescTable[tmp];
  /* PCLK2 clock frequency */
  RCC_Clocks->PCLK2_Frequency = RCC_Clocks->HCLK_Frequency >> presc;
}

void RCC_RTCCLKConfig(uint32_t RCC_RTCCLKSource)
{
  uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_RCC_RTCCLK_SOURCE(RCC_RTCCLKSource));

  if ((RCC_RTCCLKSource & 0x00000300) == 0x00000300)
  { /* If HSE is selected as RTC clock source, configure HSE division factor for RTC clock */
    tmpreg = RCC->CFGR;

    /* Clear RTCPRE[4:0] bits */
    tmpreg &= ~RCC_CFGR_RTCPRE;

    /* Configure HSE division factor for RTC clock */
    tmpreg |= (RCC_RTCCLKSource & 0xFFFFCFF);

    /* Store the new value */
    RCC->CFGR = tmpreg;
  }
    
  /* Select the RTC clock source */
  RCC->BDCR |= (RCC_RTCCLKSource & 0x00000FFF);
}

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

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

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

void RCC_I2SCLKConfig(uint32_t RCC_I2SCLKSource)
{
  /* Check the parameters */
  assert_param(IS_RCC_I2SCLK_SOURCE(RCC_I2SCLKSource));

  *(__IO uint32_t *) CFGR_I2SSRC_BB = RCC_I2SCLKSource;
}

void RCC_TIMCLKPresConfig(uint32_t RCC_TIMCLKPrescaler)
{
  /* Check the parameters */
  assert_param(IS_RCC_TIMCLK_PRESCALER(RCC_TIMCLKPrescaler));

  *(__IO uint32_t *) DCKCFGR_TIMPRE_BB = RCC_TIMCLKPrescaler;
  
}

void RCC_AHB1PeriphClockCmd(uint32_t RCC_AHB1Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_AHB1_CLOCK_PERIPH(RCC_AHB1Periph));

  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    RCC->AHB1ENR |= RCC_AHB1Periph;
  }
  else
  {
    RCC->AHB1ENR &= ~RCC_AHB1Periph;
  }
}

void RCC_AHB2PeriphClockCmd(uint32_t RCC_AHB2Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_AHB2_PERIPH(RCC_AHB2Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    RCC->AHB2ENR |= RCC_AHB2Periph;
  }
  else
  {
    RCC->AHB2ENR &= ~RCC_AHB2Periph;
  }
}

void RCC_AHB3PeriphClockCmd(uint32_t RCC_AHB3Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_AHB3_PERIPH(RCC_AHB3Periph));  
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    RCC->AHB3ENR |= RCC_AHB3Periph;
  }
  else
  {
    RCC->AHB3ENR &= ~RCC_AHB3Periph;
  }
}

void RCC_APB1PeriphClockCmd(uint32_t RCC_APB1Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_APB1_PERIPH(RCC_APB1Periph));  
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    RCC->APB1ENR |= RCC_APB1Periph;
  }
  else
  {
    RCC->APB1ENR &= ~RCC_APB1Periph;
  }
}

void RCC_APB2PeriphClockCmd(uint32_t RCC_APB2Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_APB2_PERIPH(RCC_APB2Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    RCC->APB2ENR |= RCC_APB2Periph;
  }
  else
  {
    RCC->APB2ENR &= ~RCC_APB2Periph;
  }
}

void RCC_AHB1PeriphResetCmd(uint32_t RCC_AHB1Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_AHB1_RESET_PERIPH(RCC_AHB1Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    RCC->AHB1RSTR |= RCC_AHB1Periph;
  }
  else
  {
    RCC->AHB1RSTR &= ~RCC_AHB1Periph;
  }
}

void RCC_AHB2PeriphResetCmd(uint32_t RCC_AHB2Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_AHB2_PERIPH(RCC_AHB2Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    RCC->AHB2RSTR |= RCC_AHB2Periph;
  }
  else
  {
    RCC->AHB2RSTR &= ~RCC_AHB2Periph;
  }
}

void RCC_AHB3PeriphResetCmd(uint32_t RCC_AHB3Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_AHB3_PERIPH(RCC_AHB3Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    RCC->AHB3RSTR |= RCC_AHB3Periph;
  }
  else
  {
    RCC->AHB3RSTR &= ~RCC_AHB3Periph;
  }
}

void RCC_APB1PeriphResetCmd(uint32_t RCC_APB1Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_APB1_PERIPH(RCC_APB1Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    RCC->APB1RSTR |= RCC_APB1Periph;
  }
  else
  {
    RCC->APB1RSTR &= ~RCC_APB1Periph;
  }
}

void RCC_APB2PeriphResetCmd(uint32_t RCC_APB2Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_APB2_RESET_PERIPH(RCC_APB2Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    RCC->APB2RSTR |= RCC_APB2Periph;
  }
  else
  {
    RCC->APB2RSTR &= ~RCC_APB2Periph;
  }
}

void RCC_AHB1PeriphClockLPModeCmd(uint32_t RCC_AHB1Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_AHB1_LPMODE_PERIPH(RCC_AHB1Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    RCC->AHB1LPENR |= RCC_AHB1Periph;
  }
  else
  {
    RCC->AHB1LPENR &= ~RCC_AHB1Periph;
  }
}

void RCC_AHB2PeriphClockLPModeCmd(uint32_t RCC_AHB2Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_AHB2_PERIPH(RCC_AHB2Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    RCC->AHB2LPENR |= RCC_AHB2Periph;
  }
  else
  {
    RCC->AHB2LPENR &= ~RCC_AHB2Periph;
  }
}

void RCC_AHB3PeriphClockLPModeCmd(uint32_t RCC_AHB3Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_AHB3_PERIPH(RCC_AHB3Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    RCC->AHB3LPENR |= RCC_AHB3Periph;
  }
  else
  {
    RCC->AHB3LPENR &= ~RCC_AHB3Periph;
  }
}

void RCC_APB1PeriphClockLPModeCmd(uint32_t RCC_APB1Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_APB1_PERIPH(RCC_APB1Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    RCC->APB1LPENR |= RCC_APB1Periph;
  }
  else
  {
    RCC->APB1LPENR &= ~RCC_APB1Periph;
  }
}

void RCC_APB2PeriphClockLPModeCmd(uint32_t RCC_APB2Periph, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_APB2_PERIPH(RCC_APB2Periph));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    RCC->APB2LPENR |= RCC_APB2Periph;
  }
  else
  {
    RCC->APB2LPENR &= ~RCC_APB2Periph;
  }
}

void RCC_ITConfig(uint8_t RCC_IT, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_RCC_IT(RCC_IT));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Perform Byte access to RCC_CIR[14:8] bits to enable the selected interrupts */
    *(__IO uint8_t *) CIR_BYTE2_ADDRESS |= RCC_IT;
  }
  else
  {
    /* Perform Byte access to RCC_CIR[14:8] bits to disable the selected interrupts */
    *(__IO uint8_t *) CIR_BYTE2_ADDRESS &= (uint8_t)~RCC_IT;
  }
}

FlagStatus RCC_GetFlagStatus(uint8_t RCC_FLAG)
{
  uint32_t tmp = 0;
  uint32_t statusreg = 0;
  FlagStatus bitstatus = RESET;

  /* Check the parameters */
  assert_param(IS_RCC_FLAG(RCC_FLAG));

  /* Get the RCC register index */
  tmp = RCC_FLAG >> 5;
  if (tmp == 1)               /* The flag to check is in CR register */
  {
    statusreg = RCC->CR;
  }
  else if (tmp == 2)          /* The flag to check is in BDCR register */
  {
    statusreg = RCC->BDCR;
  }
  else                       /* The flag to check is in CSR register */
  {
    statusreg = RCC->CSR;
  }

  /* Get the flag position */
  tmp = RCC_FLAG & FLAG_MASK;
  if ((statusreg & ((uint32_t)1 << tmp)) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  /* Return the flag status */
  return bitstatus;
}

void RCC_ClearFlag(void)
{
  /* Set RMVF bit to clear the reset flags */
  RCC->CSR |= RCC_CSR_RMVF;
}

ITStatus RCC_GetITStatus(uint8_t RCC_IT)
{
  ITStatus bitstatus = RESET;

  /* Check the parameters */
  assert_param(IS_RCC_GET_IT(RCC_IT));

  /* Check the status of the specified RCC interrupt */
  if ((RCC->CIR & RCC_IT) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  /* Return the RCC_IT status */
  return  bitstatus;
}

void RCC_ClearITPendingBit(uint8_t RCC_IT)
{
  /* Check the parameters */
  assert_param(IS_RCC_CLEAR_IT(RCC_IT));

  /* Perform Byte access to RCC_CIR[23:16] bits to clear the selected interrupt
     pending bits */
  *(__IO uint8_t *) CIR_BYTE3_ADDRESS = RCC_IT;
}

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