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/**

  ******************************************************************************

  * @file    stm32f0xx_ll_rcc.c

  * @author  MCD Application Team

  * @brief   RCC LL module driver.

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.

  * All rights reserved.</center></h2>

  *

  * This software component is licensed by ST under BSD 3-Clause license,

  * the "License"; You may not use this file except in compliance with the

  * License. You may obtain a copy of the License at:

  *                        opensource.org/licenses/BSD-3-Clause

  *

  ******************************************************************************

  */

#if defined(USE_FULL_LL_DRIVER)

/* Includes ------------------------------------------------------------------*/

#include "stm32f0xx_ll_rcc.h"

#ifdef  USE_FULL_ASSERT

  #include "stm32_assert.h"

#else

  #define assert_param(expr) ((void)0U)

#endif /* USE_FULL_ASSERT */

/** @addtogroup STM32F0xx_LL_Driver

  * @{

  */

#if defined(RCC)

/** @defgroup RCC_LL RCC

  * @{

  */

/* Private types -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private constants ---------------------------------------------------------*/

/* Private macros ------------------------------------------------------------*/

/** @addtogroup RCC_LL_Private_Macros

  * @{

  */

#if defined(RCC_CFGR3_USART2SW) && defined(RCC_CFGR3_USART3SW)

#define IS_LL_RCC_USART_CLKSOURCE(__VALUE__)  (((__VALUE__) == LL_RCC_USART1_CLKSOURCE) \

                                            || ((__VALUE__) == LL_RCC_USART2_CLKSOURCE) \

                                            || ((__VALUE__) == LL_RCC_USART3_CLKSOURCE))

#elif defined(RCC_CFGR3_USART2SW) && !defined(RCC_CFGR3_USART3SW)

#define IS_LL_RCC_USART_CLKSOURCE(__VALUE__)  (((__VALUE__) == LL_RCC_USART1_CLKSOURCE) \

                                            || ((__VALUE__) == LL_RCC_USART2_CLKSOURCE))

#elif defined(RCC_CFGR3_USART3SW) && !defined(RCC_CFGR3_USART2SW)

#define IS_LL_RCC_USART_CLKSOURCE(__VALUE__)  (((__VALUE__) == LL_RCC_USART1_CLKSOURCE) \

                                            || ((__VALUE__) == LL_RCC_USART3_CLKSOURCE))

#else

#define IS_LL_RCC_USART_CLKSOURCE(__VALUE__)  (((__VALUE__) == LL_RCC_USART1_CLKSOURCE))

#endif /* RCC_CFGR3_USART2SW && RCC_CFGR3_USART3SW */

#define IS_LL_RCC_I2C_CLKSOURCE(__VALUE__)     ((__VALUE__) == LL_RCC_I2C1_CLKSOURCE)

#if defined(USB)

#define IS_LL_RCC_USB_CLKSOURCE(__VALUE__)    (((__VALUE__) == LL_RCC_USB_CLKSOURCE))

#endif /* USB */

#if defined(CEC)

#define IS_LL_RCC_CEC_CLKSOURCE(__VALUE__)    (((__VALUE__) == LL_RCC_CEC_CLKSOURCE))

#endif /* CEC */

/**

  * @}

  */

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

/** @defgroup RCC_LL_Private_Functions RCC Private functions

  * @{

  */

uint32_t RCC_GetSystemClockFreq(void);

uint32_t RCC_GetHCLKClockFreq(uint32_t SYSCLK_Frequency);

uint32_t RCC_GetPCLK1ClockFreq(uint32_t HCLK_Frequency);

uint32_t RCC_PLL_GetFreqDomain_SYS(void);

/**

  * @}

  */

/* Exported functions --------------------------------------------------------*/

/** @addtogroup RCC_LL_Exported_Functions

  * @{

  */

/** @addtogroup RCC_LL_EF_Init

  * @{

  */

/**

  * @brief  Reset the RCC clock configuration to the default reset state.

  * @note   The default reset state of the clock configuration is given below:

  *         - HSI ON and used as system clock source

  *         - HSE and PLL OFF

  *         - AHB and APB1 prescaler set to 1.

  *         - CSS, MCO OFF

  *         - All interrupts disabled

  * @note   This function doesn't modify the configuration of the

  *         - Peripheral clocks

  *         - LSI, LSE and RTC clocks

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: RCC registers are de-initialized

  *          - ERROR: not applicable

  */

ErrorStatus LL_RCC_DeInit(void)

{

  __IO uint32_t vl_mask;

  /* Set HSION bit */

  LL_RCC_HSI_Enable();

  /* Wait for HSI READY bit */

  while(LL_RCC_HSI_IsReady() != 1U)

  {}

  /* Set HSITRIM bits to the reset value*/

  LL_RCC_HSI_SetCalibTrimming(0x10U);

  /* Reset SW, HPRE, PPRE and MCOSEL bits */

  vl_mask = 0xFFFFFFFFU;

  CLEAR_BIT(vl_mask, (RCC_CFGR_SW | RCC_CFGR_HPRE | RCC_CFGR_PPRE | RCC_CFGR_MCOSEL));

  /* Write new value in CFGR register */

  LL_RCC_WriteReg(CFGR, vl_mask);

  /* Wait till system clock source is ready */

  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSI)

  {}

  /* Read CR register */

  vl_mask = LL_RCC_ReadReg(CR);

  /* Reset HSEON, CSSON, PLLON bits */

  CLEAR_BIT(vl_mask, (RCC_CR_PLLON | RCC_CR_CSSON | RCC_CR_HSEON));

  /* Write new value in CR register */

  LL_RCC_WriteReg(CR, vl_mask);

  /* Wait for PLL READY bit to be reset */

  while(LL_RCC_PLL_IsReady() != 0U)

  {}

  /* Reset HSEBYP bit */

  LL_RCC_HSE_DisableBypass();

  /* Reset CFGR register */

  LL_RCC_WriteReg(CFGR, 0x00000000U);

#if defined(RCC_HSI48_SUPPORT)

  /* Reset CR2 register */

  LL_RCC_WriteReg(CR2, 0x00000000U);

  /* Disable HSI48 */

  LL_RCC_HSI48_Disable();

#endif /*RCC_HSI48_SUPPORT*/

  /* Set HSI14TRIM/HSI14ON/HSI14DIS bits to the reset value*/

  LL_RCC_HSI14_SetCalibTrimming(0x10U);

  LL_RCC_HSI14_Disable();

  LL_RCC_HSI14_EnableADCControl();

  /* Reset CFGR2 register */

  LL_RCC_WriteReg(CFGR2, 0x00000000U);

  /* Reset CFGR3 register */

  LL_RCC_WriteReg(CFGR3, 0x00000000U);

  /* Clear pending flags */

#if defined(RCC_HSI48_SUPPORT)

  vl_mask = (LL_RCC_CIR_LSIRDYC | LL_RCC_CIR_LSERDYC | LL_RCC_CIR_HSIRDYC | LL_RCC_CIR_HSERDYC |\

             LL_RCC_CIR_PLLRDYC | LL_RCC_CIR_HSI14RDYC | LL_RCC_CIR_HSI48RDYC | LL_RCC_CIR_CSSC);

#else

  vl_mask = (LL_RCC_CIR_LSIRDYC | LL_RCC_CIR_LSERDYC | LL_RCC_CIR_HSIRDYC | LL_RCC_CIR_HSERDYC |\

             LL_RCC_CIR_PLLRDYC | LL_RCC_CIR_HSI14RDYC | LL_RCC_CIR_CSSC);

#endif /* RCC_HSI48_SUPPORT */

  /* Write new value in CIR register */

  LL_RCC_WriteReg(CIR, vl_mask);

  /* Disable all interrupts */

  LL_RCC_WriteReg(CIR, 0x00000000U);

  /* Clear reset flags */

  LL_RCC_ClearResetFlags();

  return SUCCESS;

}

/**

  * @}

  */

/** @addtogroup RCC_LL_EF_Get_Freq

  * @brief  Return the frequencies of different on chip clocks;  System, AHB and APB1 buses clocks

  *         and different peripheral clocks available on the device.

  * @note   If SYSCLK source is HSI, function returns values based on HSI_VALUE(**)

  * @note   If SYSCLK source is HSE, function returns values based on HSE_VALUE(***)

  * @note   If SYSCLK source is PLL, function returns values based on

  *         HSI_VALUE(**) or HSE_VALUE(***) multiplied/divided by the PLL factors.

  * @note   (**) HSI_VALUE is a defined constant but the real value may vary

  *              depending on the variations in voltage and temperature.

  * @note   (***) HSE_VALUE is a defined constant, user has to ensure that

  *               HSE_VALUE is same as the real frequency of the crystal used.

  *               Otherwise, this function may have wrong result.

  * @note   The result of this function could be incorrect when using fractional

  *         value for HSE crystal.

  * @note   This function can be used by the user application to compute the

  *         baud-rate for the communication peripherals or configure other parameters.

  * @{

  */

/**

  * @brief  Return the frequencies of different on chip clocks;  System, AHB and APB1 buses clocks

  * @note   Each time SYSCLK, HCLK and/or PCLK1 clock changes, this function

  *         must be called to update structure fields. Otherwise, any

  *         configuration based on this function will be incorrect.

  * @param  RCC_Clocks pointer to a @ref LL_RCC_ClocksTypeDef structure which will hold the clocks frequencies

  * @retval None

  */

void LL_RCC_GetSystemClocksFreq(LL_RCC_ClocksTypeDef *RCC_Clocks)

{

  /* Get SYSCLK frequency */

  RCC_Clocks->SYSCLK_Frequency = RCC_GetSystemClockFreq();

  /* HCLK clock frequency */

  RCC_Clocks->HCLK_Frequency   = RCC_GetHCLKClockFreq(RCC_Clocks->SYSCLK_Frequency);

  /* PCLK1 clock frequency */

  RCC_Clocks->PCLK1_Frequency  = RCC_GetPCLK1ClockFreq(RCC_Clocks->HCLK_Frequency);

}

/**

  * @brief  Return USARTx clock frequency

  * @param  USARTxSource This parameter can be one of the following values:

  *         @arg @ref LL_RCC_USART1_CLKSOURCE

  *         @arg @ref LL_RCC_USART2_CLKSOURCE (*)

  *         @arg @ref LL_RCC_USART3_CLKSOURCE (*)

  *

  *         (*) value not defined in all devices.

  * @retval USART clock frequency (in Hz)

  *         @arg @ref LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (HSI or LSE) is not ready

  */

uint32_t LL_RCC_GetUSARTClockFreq(uint32_t USARTxSource)

{

  uint32_t usart_frequency = LL_RCC_PERIPH_FREQUENCY_NO;

  /* Check parameter */

  assert_param(IS_LL_RCC_USART_CLKSOURCE(USARTxSource));

#if defined(RCC_CFGR3_USART1SW)

  if (USARTxSource == LL_RCC_USART1_CLKSOURCE)

  {

    /* USART1CLK clock frequency */

    switch (LL_RCC_GetUSARTClockSource(USARTxSource))

    {

      case LL_RCC_USART1_CLKSOURCE_SYSCLK: /* USART1 Clock is System Clock */

        usart_frequency = RCC_GetSystemClockFreq();

        break;

      case LL_RCC_USART1_CLKSOURCE_HSI:    /* USART1 Clock is HSI Osc. */

        if (LL_RCC_HSI_IsReady())

        {

          usart_frequency = HSI_VALUE;

        }

        break;

      case LL_RCC_USART1_CLKSOURCE_LSE:    /* USART1 Clock is LSE Osc. */

        if (LL_RCC_LSE_IsReady())

        {

          usart_frequency = LSE_VALUE;

        }

        break;

      case LL_RCC_USART1_CLKSOURCE_PCLK1:  /* USART1 Clock is PCLK1 */

      default:

        usart_frequency = RCC_GetPCLK1ClockFreq(RCC_GetHCLKClockFreq(RCC_GetSystemClockFreq()));

        break;

    }

  }

#endif /* RCC_CFGR3_USART1SW  */

#if defined(RCC_CFGR3_USART2SW)

  if (USARTxSource == LL_RCC_USART2_CLKSOURCE)

  {

    /* USART2CLK clock frequency */

    switch (LL_RCC_GetUSARTClockSource(USARTxSource))

    {

      case LL_RCC_USART2_CLKSOURCE_SYSCLK: /* USART2 Clock is System Clock */

        usart_frequency = RCC_GetSystemClockFreq();

        break;

      case LL_RCC_USART2_CLKSOURCE_HSI:    /* USART2 Clock is HSI Osc. */

        if (LL_RCC_HSI_IsReady())

        {

          usart_frequency = HSI_VALUE;

        }

        break;

      case LL_RCC_USART2_CLKSOURCE_LSE:    /* USART2 Clock is LSE Osc. */

        if (LL_RCC_LSE_IsReady())

        {

          usart_frequency = LSE_VALUE;

        }

        break;

      case LL_RCC_USART2_CLKSOURCE_PCLK1:  /* USART2 Clock is PCLK1 */

      default:

        usart_frequency = RCC_GetPCLK1ClockFreq(RCC_GetHCLKClockFreq(RCC_GetSystemClockFreq()));

        break;

    }

  }

#endif /* RCC_CFGR3_USART2SW */

#if defined(RCC_CFGR3_USART3SW)

  if (USARTxSource == LL_RCC_USART3_CLKSOURCE)

  {

    /* USART3CLK clock frequency */

    switch (LL_RCC_GetUSARTClockSource(USARTxSource))

    {

      case LL_RCC_USART3_CLKSOURCE_SYSCLK: /* USART3 Clock is System Clock */

        usart_frequency = RCC_GetSystemClockFreq();

        break;

      case LL_RCC_USART3_CLKSOURCE_HSI:    /* USART3 Clock is HSI Osc. */

        if (LL_RCC_HSI_IsReady())

        {

          usart_frequency = HSI_VALUE;

        }

        break;

      case LL_RCC_USART3_CLKSOURCE_LSE:    /* USART3 Clock is LSE Osc. */

        if (LL_RCC_LSE_IsReady())

        {

          usart_frequency = LSE_VALUE;

        }

        break;

      case LL_RCC_USART3_CLKSOURCE_PCLK1:  /* USART3 Clock is PCLK1 */

      default:

        usart_frequency = RCC_GetPCLK1ClockFreq(RCC_GetHCLKClockFreq(RCC_GetSystemClockFreq()));

        break;

    }

  }

#endif /* RCC_CFGR3_USART3SW */

  return usart_frequency;

}

/**

  * @brief  Return I2Cx clock frequency

  * @param  I2CxSource This parameter can be one of the following values:

  *         @arg @ref LL_RCC_I2C1_CLKSOURCE

  * @retval I2C clock frequency (in Hz)

  *         @arg @ref LL_RCC_PERIPH_FREQUENCY_NO indicates that HSI oscillator is not ready

  */

uint32_t LL_RCC_GetI2CClockFreq(uint32_t I2CxSource)

{

  uint32_t i2c_frequency = LL_RCC_PERIPH_FREQUENCY_NO;

  /* Check parameter */

  assert_param(IS_LL_RCC_I2C_CLKSOURCE(I2CxSource));

  /* I2C1 CLK clock frequency */

  if (I2CxSource == LL_RCC_I2C1_CLKSOURCE)

  {

    switch (LL_RCC_GetI2CClockSource(I2CxSource))

    {

      case LL_RCC_I2C1_CLKSOURCE_SYSCLK: /* I2C1 Clock is System Clock */

        i2c_frequency = RCC_GetSystemClockFreq();

        break;

      case LL_RCC_I2C1_CLKSOURCE_HSI:    /* I2C1 Clock is HSI Osc. */

      default:

        if (LL_RCC_HSI_IsReady())

        {

          i2c_frequency = HSI_VALUE;

        }

        break;

    }

  }

  return i2c_frequency;

}

#if defined(USB)

/**

  * @brief  Return USBx clock frequency

  * @param  USBxSource This parameter can be one of the following values:

  *         @arg @ref LL_RCC_USB_CLKSOURCE

  * @retval USB clock frequency (in Hz)

  *         @arg @ref LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (HSI48) or PLL is not ready

  *         @arg @ref LL_RCC_PERIPH_FREQUENCY_NA indicates that no clock source selected

  */

uint32_t LL_RCC_GetUSBClockFreq(uint32_t USBxSource)

{

  uint32_t usb_frequency = LL_RCC_PERIPH_FREQUENCY_NO;

  /* Check parameter */

  assert_param(IS_LL_RCC_USB_CLKSOURCE(USBxSource));

  /* USBCLK clock frequency */

  switch (LL_RCC_GetUSBClockSource(USBxSource))

  {

    case LL_RCC_USB_CLKSOURCE_PLL:        /* PLL clock used as USB clock source */

      if (LL_RCC_PLL_IsReady())

      {

        usb_frequency = RCC_PLL_GetFreqDomain_SYS();

      }

      break;

#if defined(RCC_CFGR3_USBSW_HSI48)

    case LL_RCC_USB_CLKSOURCE_HSI48:      /* HSI48 clock used as USB clock source */

    default:

      if (LL_RCC_HSI48_IsReady())

      {

        usb_frequency = HSI48_VALUE;

      }

      break;

#else

    case LL_RCC_USB_CLKSOURCE_NONE:       /* No clock used as USB clock source */

    default:

      usb_frequency = LL_RCC_PERIPH_FREQUENCY_NA;

      break;

#endif /* RCC_CFGR3_USBSW_HSI48 */

  }

  return usb_frequency;

}

#endif /* USB */

#if defined(CEC)

/**

  * @brief  Return CECx clock frequency

  * @param  CECxSource This parameter can be one of the following values:

  *         @arg @ref LL_RCC_CEC_CLKSOURCE

  * @retval CEC clock frequency (in Hz)

  *        @arg @ref LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillators (HSI or LSE) are not ready

  */

uint32_t LL_RCC_GetCECClockFreq(uint32_t CECxSource)

{

  uint32_t cec_frequency = LL_RCC_PERIPH_FREQUENCY_NO;

  /* Check parameter */

  assert_param(IS_LL_RCC_CEC_CLKSOURCE(CECxSource));

  /* CECCLK clock frequency */

  switch (LL_RCC_GetCECClockSource(CECxSource))

  {

    case LL_RCC_CEC_CLKSOURCE_HSI_DIV244:   /* HSI / 244 clock used as CEC clock source */

      if (LL_RCC_HSI_IsReady())

      {

        cec_frequency = HSI_VALUE / 244U;

      }

      break;

    case LL_RCC_CEC_CLKSOURCE_LSE:          /* LSE clock used as CEC clock source */

    default:

      if (LL_RCC_LSE_IsReady())

      {

        cec_frequency = LSE_VALUE;

      }

      break;

  }

  return cec_frequency;

}

#endif /* CEC */

/**

  * @}

  */

/**

  * @}

  */

/** @addtogroup RCC_LL_Private_Functions

  * @{

  */

/**

  * @brief  Return SYSTEM clock frequency

  * @retval SYSTEM clock frequency (in Hz)

  */

uint32_t RCC_GetSystemClockFreq(void)

{

  uint32_t frequency = 0U;

  /* Get SYSCLK source -------------------------------------------------------*/

  switch (LL_RCC_GetSysClkSource())

  {

    case LL_RCC_SYS_CLKSOURCE_STATUS_HSI:  /* HSI used as system clock  source */

      frequency = HSI_VALUE;

      break;

    case LL_RCC_SYS_CLKSOURCE_STATUS_HSE:  /* HSE used as system clock  source */

      frequency = HSE_VALUE;

      break;

    case LL_RCC_SYS_CLKSOURCE_STATUS_PLL:  /* PLL used as system clock  source */

      frequency = RCC_PLL_GetFreqDomain_SYS();

      break;

#if defined(RCC_HSI48_SUPPORT)

    case LL_RCC_SYS_CLKSOURCE_STATUS_HSI48:/* HSI48 used as system clock  source */

      frequency = HSI48_VALUE;

      break;

#endif /* RCC_HSI48_SUPPORT */

    default:

      frequency = HSI_VALUE;

      break;

  }

  return frequency;

}

/**

  * @brief  Return HCLK clock frequency

  * @param  SYSCLK_Frequency SYSCLK clock frequency

  * @retval HCLK clock frequency (in Hz)

  */

uint32_t RCC_GetHCLKClockFreq(uint32_t SYSCLK_Frequency)

{

  /* HCLK clock frequency */

  return __LL_RCC_CALC_HCLK_FREQ(SYSCLK_Frequency, LL_RCC_GetAHBPrescaler());

}

/**

  * @brief  Return PCLK1 clock frequency

  * @param  HCLK_Frequency HCLK clock frequency

  * @retval PCLK1 clock frequency (in Hz)

  */

uint32_t RCC_GetPCLK1ClockFreq(uint32_t HCLK_Frequency)

{

  /* PCLK1 clock frequency */

  return __LL_RCC_CALC_PCLK1_FREQ(HCLK_Frequency, LL_RCC_GetAPB1Prescaler());

}

/**

  * @brief  Return PLL clock frequency used for system domain

  * @retval PLL clock frequency (in Hz)

  */

uint32_t RCC_PLL_GetFreqDomain_SYS(void)

{

  uint32_t pllinputfreq = 0U, pllsource = 0U;

  /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL divider) * PLL Multiplicator */

  /* Get PLL source */

  pllsource = LL_RCC_PLL_GetMainSource();

  switch (pllsource)

  {

#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)

    case LL_RCC_PLLSOURCE_HSI:       /* HSI used as PLL clock source */

      pllinputfreq = HSI_VALUE;

#else

    case LL_RCC_PLLSOURCE_HSI_DIV_2: /* HSI used as PLL clock source */

      pllinputfreq = HSI_VALUE / 2U;

#endif /* RCC_PLLSRC_PREDIV1_SUPPORT */

      break;

#if defined(RCC_HSI48_SUPPORT)

    case LL_RCC_PLLSOURCE_HSI48:     /* HSI48 used as PLL clock source */

      pllinputfreq = HSI48_VALUE;

      break;

#endif /* RCC_HSI48_SUPPORT */

    case LL_RCC_PLLSOURCE_HSE:       /* HSE used as PLL clock source */

      pllinputfreq = HSE_VALUE;

      break;

    default:

#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)

      pllinputfreq = HSI_VALUE;

#else

      pllinputfreq = HSI_VALUE / 2U;

#endif /* RCC_PLLSRC_PREDIV1_SUPPORT */

      break;

  }

#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)

  return __LL_RCC_CALC_PLLCLK_FREQ(pllinputfreq, LL_RCC_PLL_GetMultiplicator(), LL_RCC_PLL_GetPrediv());

#else

  return __LL_RCC_CALC_PLLCLK_FREQ((pllinputfreq / (LL_RCC_PLL_GetPrediv() + 1U)), LL_RCC_PLL_GetMultiplicator());

#endif /* RCC_PLLSRC_PREDIV1_SUPPORT */

}

/**

  * @}

  */

/**

  * @}

  */

#endif /* defined(RCC) */

/**

  * @}

  */

#endif /* USE_FULL_LL_DRIVER */

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