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/**

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

  * @file    stm32f1xx_ll_rcc.c

  * @author  MCD Application Team

  * @brief   RCC LL module driver.

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

  * @attention

  *

  * Copyright (c) 2016 STMicroelectronics.

  * All rights reserved.

  *

  * This software is licensed under terms that can be found in the LICENSE file in

  * the root directory of this software component.

  * If no LICENSE file comes with this software, it is provided AS-IS.

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

  */

#if defined(USE_FULL_LL_DRIVER)

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

#include "stm32f1xx_ll_rcc.h"

#ifdef  USE_FULL_ASSERT

#include "stm32_assert.h"

#else

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

#endif /* USE_FULL_ASSERT */

/** @addtogroup STM32F1xx_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_PLLI2S_SUPPORT)

#define IS_LL_RCC_I2S_CLKSOURCE(__VALUE__)     (((__VALUE__) == LL_RCC_I2S2_CLKSOURCE) \

                                             || ((__VALUE__) == LL_RCC_I2S3_CLKSOURCE))

#endif /* RCC_PLLI2S_SUPPORT */

#if defined(USB) || defined(USB_OTG_FS)

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

#endif /* USB */

#define IS_LL_RCC_ADC_CLKSOURCE(__VALUE__)    (((__VALUE__) == LL_RCC_ADC_CLKSOURCE))

/**

  * @}

  */

/* 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_GetPCLK2ClockFreq(uint32_t HCLK_Frequency);

uint32_t RCC_PLL_GetFreqDomain_SYS(void);

#if defined(RCC_PLLI2S_SUPPORT)

uint32_t RCC_PLLI2S_GetFreqDomain_I2S(void);

#endif /* RCC_PLLI2S_SUPPORT */

#if defined(RCC_PLL2_SUPPORT)

uint32_t RCC_PLL2_GetFreqClockFreq(void);

#endif /* RCC_PLL2_SUPPORT */

/**

  * @}

  */

/* 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 PLL, PLL2 & PLL3 are OFF

  *         - AHB, APB1 and APB2 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)

{

  /* Set HSION bit */

  LL_RCC_HSI_Enable();

  /* Wait for HSI READY bit */

  while (LL_RCC_HSI_IsReady() != 1U)

  {}

  /* Configure HSI as system clock source */

  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSI);

  /* Wait till clock switch is ready */

  while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSI)

  {}

  /* Reset PLLON bit */

  CLEAR_BIT(RCC->CR, RCC_CR_PLLON);

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

  while (LL_RCC_PLL_IsReady() != 0U)

  {}

  /* Reset CFGR register */

  LL_RCC_WriteReg(CFGR, 0x00000000U);

  /* Reset HSEON, HSEBYP & CSSON bits */

  CLEAR_BIT(RCC->CR, (RCC_CR_CSSON | RCC_CR_HSEON | RCC_CR_HSEBYP));

#if defined(RCC_CR_PLL2ON)

  /* Reset PLL2ON bit */

  CLEAR_BIT(RCC->CR, RCC_CR_PLL2ON);

#endif /* RCC_CR_PLL2ON */

#if defined(RCC_CR_PLL3ON)

  /* Reset PLL3ON bit */

  CLEAR_BIT(RCC->CR, RCC_CR_PLL3ON);

#endif /* RCC_CR_PLL3ON */

  /* Set HSITRIM bits to the reset value */

  LL_RCC_HSI_SetCalibTrimming(0x10U);

#if defined(RCC_CFGR2_PREDIV1)

  /* Reset CFGR2 register */

  LL_RCC_WriteReg(CFGR2, 0x00000000U);

#endif /* RCC_CFGR2_PREDIV1 */

  /* 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, APB1 and APB2 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, APB1 and APB2 buses clocks

  * @note   Each time SYSCLK, HCLK, PCLK1 and/or PCLK2 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);

  /* PCLK2 clock frequency */

  RCC_Clocks->PCLK2_Frequency  = RCC_GetPCLK2ClockFreq(RCC_Clocks->HCLK_Frequency);

}

#if defined(RCC_CFGR2_I2S2SRC)

/**

  * @brief  Return I2Sx clock frequency

  * @param  I2SxSource This parameter can be one of the following values:

  *         @arg @ref LL_RCC_I2S2_CLKSOURCE

  *         @arg @ref LL_RCC_I2S3_CLKSOURCE

  * @retval I2S clock frequency (in Hz)

  */

uint32_t LL_RCC_GetI2SClockFreq(uint32_t I2SxSource)

{

  uint32_t i2s_frequency = LL_RCC_PERIPH_FREQUENCY_NO;

  /* Check parameter */

  assert_param(IS_LL_RCC_I2S_CLKSOURCE(I2SxSource));

  /* I2S1CLK clock frequency */

  switch (LL_RCC_GetI2SClockSource(I2SxSource))

  {

    case LL_RCC_I2S2_CLKSOURCE_SYSCLK:        /*!< System clock selected as I2S clock source */

    case LL_RCC_I2S3_CLKSOURCE_SYSCLK:

      i2s_frequency = RCC_GetSystemClockFreq();

      break;

    case LL_RCC_I2S2_CLKSOURCE_PLLI2S_VCO:    /*!< PLLI2S oscillator clock selected as I2S clock source */

    case LL_RCC_I2S3_CLKSOURCE_PLLI2S_VCO:

    default:

      i2s_frequency = RCC_PLLI2S_GetFreqDomain_I2S() * 2U;

      break;

  }

  return i2s_frequency;

}

#endif /* RCC_CFGR2_I2S2SRC */

#if defined(USB) || defined(USB_OTG_FS)

/**

  * @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 (HSI), HSE or PLL is not ready

  */

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))

  {

#if defined(RCC_CFGR_USBPRE)

    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;

    case LL_RCC_USB_CLKSOURCE_PLL_DIV_1_5:        /* PLL clock divided by 1.5 used as USB clock source */

    default:

      if (LL_RCC_PLL_IsReady())

      {

        usb_frequency = (RCC_PLL_GetFreqDomain_SYS() * 3U) / 2U;

      }

      break;

#endif /* RCC_CFGR_USBPRE */

#if defined(RCC_CFGR_OTGFSPRE)

    /* USBCLK = PLLVCO/2

              = (2 x PLLCLK) / 2

              = PLLCLK */

    case LL_RCC_USB_CLKSOURCE_PLL_DIV_2:        /* PLL clock used as USB clock source */

      if (LL_RCC_PLL_IsReady())

      {

        usb_frequency = RCC_PLL_GetFreqDomain_SYS();

      }

      break;

    /* USBCLK = PLLVCO/3

              = (2 x PLLCLK) / 3 */

    case LL_RCC_USB_CLKSOURCE_PLL_DIV_3:        /* PLL clock divided by 3 used as USB clock source */

    default:

      if (LL_RCC_PLL_IsReady())

      {

        usb_frequency = (RCC_PLL_GetFreqDomain_SYS() * 2U) / 3U;

      }

      break;

#endif /* RCC_CFGR_OTGFSPRE */

  }

  return usb_frequency;

}

#endif /* USB */

/**

  * @brief  Return ADCx clock frequency

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

  *         @arg @ref LL_RCC_ADC_CLKSOURCE

  * @retval ADC clock frequency (in Hz)

  */

uint32_t LL_RCC_GetADCClockFreq(uint32_t ADCxSource)

{

  uint32_t adc_prescaler = 0U;

  uint32_t adc_frequency = 0U;

  /* Check parameter */

  assert_param(IS_LL_RCC_ADC_CLKSOURCE(ADCxSource));

  /* Get ADC prescaler */

  adc_prescaler = LL_RCC_GetADCClockSource(ADCxSource);

  /* ADC frequency = PCLK2 frequency / ADC prescaler (2, 4, 6 or 8) */

  adc_frequency = RCC_GetPCLK2ClockFreq(RCC_GetHCLKClockFreq(RCC_GetSystemClockFreq()))

                  / (((adc_prescaler >> POSITION_VAL(ADCxSource)) + 1U) * 2U);

  return adc_frequency;

}

/**

  * @}

  */

/**

  * @}

  */

/** @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;

    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 PCLK2 clock frequency

  * @param  HCLK_Frequency HCLK clock frequency

  * @retval PCLK2 clock frequency (in Hz)

  */

uint32_t RCC_GetPCLK2ClockFreq(uint32_t HCLK_Frequency)

{

  /* PCLK2 clock frequency */

  return __LL_RCC_CALC_PCLK2_FREQ(HCLK_Frequency, LL_RCC_GetAPB2Prescaler());

}

/**

  * @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, HSI_VALUE or PLL2 / PLL Predivider) * PLL Multiplicator */

  /* Get PLL source */

  pllsource = LL_RCC_PLL_GetMainSource();

  switch (pllsource)

  {

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

      pllinputfreq = HSI_VALUE / 2U;

      break;

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

      pllinputfreq = HSE_VALUE / (LL_RCC_PLL_GetPrediv() + 1U);

      break;

#if defined(RCC_PLL2_SUPPORT)

    case LL_RCC_PLLSOURCE_PLL2:       /* PLL2 used as PLL clock source */

      pllinputfreq = RCC_PLL2_GetFreqClockFreq() / (LL_RCC_PLL_GetPrediv() + 1U);

      break;

#endif /* RCC_PLL2_SUPPORT */

    default:

      pllinputfreq = HSI_VALUE / 2U;

      break;

  }

  return __LL_RCC_CALC_PLLCLK_FREQ(pllinputfreq, LL_RCC_PLL_GetMultiplicator());

}

#if defined(RCC_PLL2_SUPPORT)

/**

  * @brief  Return PLL clock frequency used for system domain

  * @retval PLL clock frequency (in Hz)

  */

uint32_t RCC_PLL2_GetFreqClockFreq(void)

{

  return __LL_RCC_CALC_PLL2CLK_FREQ(HSE_VALUE, LL_RCC_PLL2_GetMultiplicator(), LL_RCC_HSE_GetPrediv2());

}

#endif /* RCC_PLL2_SUPPORT */

#if defined(RCC_PLLI2S_SUPPORT)

/**

  * @brief  Return PLL clock frequency used for system domain

  * @retval PLL clock frequency (in Hz)

  */

uint32_t RCC_PLLI2S_GetFreqDomain_I2S(void)

{

  return __LL_RCC_CALC_PLLI2SCLK_FREQ(HSE_VALUE, LL_RCC_PLLI2S_GetMultiplicator(), LL_RCC_HSE_GetPrediv2());

}

#endif /* RCC_PLLI2S_SUPPORT */

/**

  * @}

  */

/**

  * @}

  */

#endif /* defined(RCC) */

/**

  * @}

  */

#endif /* USE_FULL_LL_DRIVER */