stm32f7xx_hal_rcc.c

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/* Includes ------------------------------------------------------------------*/
#include "stm32f7xx_hal.h"

#ifdef HAL_RCC_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
#define MCO1_CLK_ENABLE()   __HAL_RCC_GPIOA_CLK_ENABLE()
#define MCO1_GPIO_PORT        GPIOA
#define MCO1_PIN              GPIO_PIN_8

#define MCO2_CLK_ENABLE()   __HAL_RCC_GPIOC_CLK_ENABLE()
#define MCO2_GPIO_PORT         GPIOC
#define MCO2_PIN               GPIO_PIN_9

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

void HAL_RCC_DeInit(void)
{
  /* Set HSION bit */
  SET_BIT(RCC->CR, RCC_CR_HSION | RCC_CR_HSITRIM_4); 
  
  /* Reset CFGR register */
  CLEAR_REG(RCC->CFGR);
  
  /* Reset HSEON, CSSON, PLLON, PLLI2S */
  CLEAR_BIT(RCC->CR, RCC_CR_HSEON | RCC_CR_CSSON | RCC_CR_PLLON| RCC_CR_PLLI2SON); 
  
  /* Reset PLLCFGR register */
  CLEAR_REG(RCC->PLLCFGR);
  SET_BIT(RCC->PLLCFGR, RCC_PLLCFGR_PLLM_4 | RCC_PLLCFGR_PLLN_6 | RCC_PLLCFGR_PLLN_7 | RCC_PLLCFGR_PLLQ_2 | ((uint32_t)0x20000000U)); 
  
  /* Reset PLLI2SCFGR register */
  CLEAR_REG(RCC->PLLI2SCFGR);
  SET_BIT(RCC->PLLI2SCFGR,  RCC_PLLI2SCFGR_PLLI2SN_6 | RCC_PLLI2SCFGR_PLLI2SN_7 | RCC_PLLI2SCFGR_PLLI2SR_1);
  
  /* Reset HSEBYP bit */
  CLEAR_BIT(RCC->CR, RCC_CR_HSEBYP);
  
  /* Disable all interrupts */
  CLEAR_REG(RCC->CIR);
  
  /* Update the SystemCoreClock global variable */
  SystemCoreClock = HSI_VALUE;
}

__weak HAL_StatusTypeDef HAL_RCC_OscConfig(RCC_OscInitTypeDef  *RCC_OscInitStruct)
{
  uint32_t tickstart = 0;  
 
  /* Check the parameters */
  assert_param(IS_RCC_OSCILLATORTYPE(RCC_OscInitStruct->OscillatorType));
  
  /*------------------------------- HSE Configuration ------------------------*/ 
  if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_HSE) == RCC_OSCILLATORTYPE_HSE)
  {
    /* Check the parameters */
    assert_param(IS_RCC_HSE(RCC_OscInitStruct->HSEState));
    /* When the HSE is used as system clock or clock source for PLL, It can not be disabled */
    if((__HAL_RCC_GET_SYSCLK_SOURCE() == RCC_SYSCLKSOURCE_STATUS_HSE) 
       || ((__HAL_RCC_GET_SYSCLK_SOURCE() == RCC_SYSCLKSOURCE_STATUS_PLLCLK) && ((RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) == RCC_PLLCFGR_PLLSRC_HSE)))
    {
      if((__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) != RESET) && (RCC_OscInitStruct->HSEState == RCC_HSE_OFF))
      {
        return HAL_ERROR;
      }
    }
    else
    {
      /* Set the new HSE configuration ---------------------------------------*/
      __HAL_RCC_HSE_CONFIG(RCC_OscInitStruct->HSEState);
      
      /* Check the HSE State */
      if(RCC_OscInitStruct->HSEState != RCC_HSE_OFF)
      {
        /* Get Start Tick*/
        tickstart = HAL_GetTick();
        
        /* Wait till HSE is ready */  
        while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) == RESET)
        {
          if((HAL_GetTick() - tickstart ) > HSE_TIMEOUT_VALUE)
          {
            return HAL_TIMEOUT;
          }
        }
      }
      else
      {
        /* Get Start Tick*/
        tickstart = HAL_GetTick();
        
        /* Wait till HSE is bypassed or disabled */
        while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) != RESET)
        {
           if((HAL_GetTick() - tickstart ) > HSE_TIMEOUT_VALUE)
          {
            return HAL_TIMEOUT;
          }
        }
      }
    }
  }
  /*----------------------------- HSI Configuration --------------------------*/ 
  if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_HSI) == RCC_OSCILLATORTYPE_HSI)
  {
    /* Check the parameters */
    assert_param(IS_RCC_HSI(RCC_OscInitStruct->HSIState));
    assert_param(IS_RCC_CALIBRATION_VALUE(RCC_OscInitStruct->HSICalibrationValue));
    
    /* Check if HSI is used as system clock or as PLL source when PLL is selected as system clock */ 
    if((__HAL_RCC_GET_SYSCLK_SOURCE() == RCC_SYSCLKSOURCE_STATUS_HSI) 
       || ((__HAL_RCC_GET_SYSCLK_SOURCE() == RCC_SYSCLKSOURCE_STATUS_PLLCLK) && ((RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) == RCC_PLLCFGR_PLLSRC_HSI)))
    {
      /* When HSI is used as system clock it will not disabled */
      if((__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) != RESET) && (RCC_OscInitStruct->HSIState != RCC_HSI_ON))
      {
        return HAL_ERROR;
      }
      /* Otherwise, just the calibration is allowed */
      else
      {
        /* Adjusts the Internal High Speed oscillator (HSI) calibration value.*/
        __HAL_RCC_HSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->HSICalibrationValue);
      }
    }
    else
    {
      /* Check the HSI State */
      if((RCC_OscInitStruct->HSIState)!= RCC_HSI_OFF)
      {
        /* Enable the Internal High Speed oscillator (HSI). */
        __HAL_RCC_HSI_ENABLE();

        /* Get Start Tick*/
        tickstart = HAL_GetTick();

        /* Wait till HSI is ready */  
        while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) == RESET)
        {
          if((HAL_GetTick() - tickstart ) > HSI_TIMEOUT_VALUE)
          {
            return HAL_TIMEOUT;
          }
        }
                
        /* Adjusts the Internal High Speed oscillator (HSI) calibration value.*/
        __HAL_RCC_HSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->HSICalibrationValue);
      }
      else
      {
        /* Disable the Internal High Speed oscillator (HSI). */
        __HAL_RCC_HSI_DISABLE();

        /* Get Start Tick*/
        tickstart = HAL_GetTick();
      
        /* Wait till HSI is ready */  
        while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) != RESET)
        {
          if((HAL_GetTick() - tickstart ) > HSI_TIMEOUT_VALUE)
          {
            return HAL_TIMEOUT;
          } 
        } 
      }
    }
  }
  /*------------------------------ LSI Configuration -------------------------*/
  if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_LSI) == RCC_OSCILLATORTYPE_LSI)
  {
    /* Check the parameters */
    assert_param(IS_RCC_LSI(RCC_OscInitStruct->LSIState));

    /* Check the LSI State */
    if((RCC_OscInitStruct->LSIState)!= RCC_LSI_OFF)
    {
      /* Enable the Internal Low Speed oscillator (LSI). */
      __HAL_RCC_LSI_ENABLE();
      
      /* Get Start Tick*/
      tickstart = HAL_GetTick();
      
      /* Wait till LSI is ready */
      while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSIRDY) == RESET)
      {
        if((HAL_GetTick() - tickstart ) > LSI_TIMEOUT_VALUE)
        {
          return HAL_TIMEOUT;
        }
      }
    }
    else
    {
      /* Disable the Internal Low Speed oscillator (LSI). */
      __HAL_RCC_LSI_DISABLE();
      
      /* Get Start Tick*/
      tickstart = HAL_GetTick();
      
      /* Wait till LSI is ready */  
      while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSIRDY) != RESET)
      {
        if((HAL_GetTick() - tickstart ) > LSI_TIMEOUT_VALUE)
        {
          return HAL_TIMEOUT;
        }
      }
    }
  }
  /*------------------------------ LSE Configuration -------------------------*/ 
  if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_LSE) == RCC_OSCILLATORTYPE_LSE)
  {
    /* Check the parameters */
    assert_param(IS_RCC_LSE(RCC_OscInitStruct->LSEState));
    
    /* Enable Power Clock*/
    __HAL_RCC_PWR_CLK_ENABLE();
    
    /* Enable write access to Backup domain */
    PWR->CR1 |= PWR_CR1_DBP;
    
    /* Wait for Backup domain Write protection disable */
    tickstart = HAL_GetTick();
    
    while((PWR->CR1 & PWR_CR1_DBP) == RESET)
    {
      if((HAL_GetTick() - tickstart ) > RCC_DBP_TIMEOUT_VALUE)
      {
        return HAL_TIMEOUT;
      }      
    }
    
    /* Set the new LSE configuration -----------------------------------------*/
    __HAL_RCC_LSE_CONFIG(RCC_OscInitStruct->LSEState);
    /* Check the LSE State */
    if((RCC_OscInitStruct->LSEState) != RCC_LSE_OFF)
    {
      /* Get Start Tick*/
      tickstart = HAL_GetTick();
      
      /* Wait till LSE is ready */  
      while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) == RESET)
      {
        if((HAL_GetTick() - tickstart ) > RCC_LSE_TIMEOUT_VALUE)
        {
          return HAL_TIMEOUT;
        }       
      }
    }
    else
    {
      /* Get Start Tick*/
      tickstart = HAL_GetTick();
      
      /* Wait till LSE is ready */  
      while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) != RESET)
      {
        if((HAL_GetTick() - tickstart ) > RCC_LSE_TIMEOUT_VALUE)
        {
          return HAL_TIMEOUT;
        }       
      }
    }
  }
  /*-------------------------------- PLL Configuration -----------------------*/
  /* Check the parameters */
  assert_param(IS_RCC_PLL(RCC_OscInitStruct->PLL.PLLState));
  if ((RCC_OscInitStruct->PLL.PLLState) != RCC_PLL_NONE)
  {
    /* Check if the PLL is used as system clock or not */
    if(__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_SYSCLKSOURCE_STATUS_PLLCLK)
    { 
      if((RCC_OscInitStruct->PLL.PLLState) == RCC_PLL_ON)
      {
        /* Check the parameters */
        assert_param(IS_RCC_PLLSOURCE(RCC_OscInitStruct->PLL.PLLSource));
        assert_param(IS_RCC_PLLM_VALUE(RCC_OscInitStruct->PLL.PLLM));
        assert_param(IS_RCC_PLLN_VALUE(RCC_OscInitStruct->PLL.PLLN));
        assert_param(IS_RCC_PLLP_VALUE(RCC_OscInitStruct->PLL.PLLP));
        assert_param(IS_RCC_PLLQ_VALUE(RCC_OscInitStruct->PLL.PLLQ));
        
        /* Disable the main PLL. */
        __HAL_RCC_PLL_DISABLE();
        
        /* Get Start Tick*/
        tickstart = HAL_GetTick();
        
        /* Wait till PLL is ready */  
        while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) != RESET)
        {
          if((HAL_GetTick() - tickstart ) > PLL_TIMEOUT_VALUE)
          {
            return HAL_TIMEOUT;
          }
        }
        
        /* Configure the main PLL clock source, multiplication and division factors. */
        WRITE_REG(RCC->PLLCFGR, (RCC_OscInitStruct->PLL.PLLSource                                            | \
                                 RCC_OscInitStruct->PLL.PLLM                                                 | \
                                 (RCC_OscInitStruct->PLL.PLLN << POSITION_VAL(RCC_PLLCFGR_PLLN))             | \
                                 (((RCC_OscInitStruct->PLL.PLLP >> 1) -1) << POSITION_VAL(RCC_PLLCFGR_PLLP)) | \
                                 (RCC_OscInitStruct->PLL.PLLQ << POSITION_VAL(RCC_PLLCFGR_PLLQ))));
        /* Enable the main PLL. */
        __HAL_RCC_PLL_ENABLE();

        /* Get Start Tick*/
        tickstart = HAL_GetTick();
        
        /* Wait till PLL is ready */  
        while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) == RESET)
        {
          if((HAL_GetTick() - tickstart ) > PLL_TIMEOUT_VALUE)
          {
            return HAL_TIMEOUT;
          } 
        }
      }
      else
      {
        /* Disable the main PLL. */
        __HAL_RCC_PLL_DISABLE();
 
        /* Get Start Tick*/
        tickstart = HAL_GetTick();
        
        /* Wait till PLL is ready */  
        while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) != RESET)
        {
          if((HAL_GetTick() - tickstart ) > PLL_TIMEOUT_VALUE)
          {
            return HAL_TIMEOUT;
          }
        }
      }
    }
    else
    {
      return HAL_ERROR;
    }
  }
  return HAL_OK;
}
 
HAL_StatusTypeDef HAL_RCC_ClockConfig(RCC_ClkInitTypeDef  *RCC_ClkInitStruct, uint32_t FLatency)
{
  uint32_t tickstart = 0;

  /* Check the parameters */
  assert_param(IS_RCC_CLOCKTYPE(RCC_ClkInitStruct->ClockType));
  assert_param(IS_FLASH_LATENCY(FLatency));

  /* To correctly read data from FLASH memory, the number of wait states (LATENCY) 
  must be correctly programmed according to the frequency of the CPU clock 
  (HCLK) and the supply voltage of the device. */
  
  /* Increasing the CPU frequency */
  if(FLatency > (FLASH->ACR & FLASH_ACR_LATENCY))
  {    
    /* Program the new number of wait states to the LATENCY bits in the FLASH_ACR register */
    __HAL_FLASH_SET_LATENCY(FLatency);
    
    /* Check that the new number of wait states is taken into account to access the Flash
    memory by reading the FLASH_ACR register */
    if((FLASH->ACR & FLASH_ACR_LATENCY) != FLatency)
    {
      return HAL_ERROR;
    }
  }
  
  /*-------------------------- HCLK Configuration --------------------------*/
  if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_HCLK) == RCC_CLOCKTYPE_HCLK)
  {
    assert_param(IS_RCC_HCLK(RCC_ClkInitStruct->AHBCLKDivider));
    MODIFY_REG(RCC->CFGR, RCC_CFGR_HPRE, RCC_ClkInitStruct->AHBCLKDivider);
  }
  
  /*------------------------- SYSCLK Configuration ---------------------------*/ 
  if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_SYSCLK) == RCC_CLOCKTYPE_SYSCLK)
  {    
    assert_param(IS_RCC_SYSCLKSOURCE(RCC_ClkInitStruct->SYSCLKSource));
    
    /* HSE is selected as System Clock Source */
    if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSE)
    {
      /* Check the HSE ready flag */  
      if(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) == RESET)
      {
        return HAL_ERROR;
      }
    }
    /* PLL is selected as System Clock Source */
    else if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_PLLCLK)
    {
      /* Check the PLL ready flag */  
      if(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) == RESET)
      {
        return HAL_ERROR;
      }
    }
    /* HSI is selected as System Clock Source */
    else
    {
      /* Check the HSI ready flag */  
      if(__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) == RESET)
      {
        return HAL_ERROR;
      }
    }
    
    __HAL_RCC_SYSCLK_CONFIG(RCC_ClkInitStruct->SYSCLKSource);
    /* Get Start Tick*/
    tickstart = HAL_GetTick();
    
    if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSE)
    {
      while (__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_SYSCLKSOURCE_STATUS_HSE)
      {
        if((HAL_GetTick() - tickstart ) > CLOCKSWITCH_TIMEOUT_VALUE)
        {
          return HAL_TIMEOUT;
        }
      }
    }
    else if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_PLLCLK)
    {
      while (__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_SYSCLKSOURCE_STATUS_PLLCLK)
      {
        if((HAL_GetTick() - tickstart ) > CLOCKSWITCH_TIMEOUT_VALUE)
        {
          return HAL_TIMEOUT;
        }
      }
    }
    else
    {
      while(__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_SYSCLKSOURCE_STATUS_HSI)
      {
        if((HAL_GetTick() - tickstart ) > CLOCKSWITCH_TIMEOUT_VALUE)
        {
          return HAL_TIMEOUT;
        }
      }
    }
  }
  
  /* Decreasing the number of wait states because of lower CPU frequency */
  if(FLatency < (FLASH->ACR & FLASH_ACR_LATENCY))
  {
    /* Program the new number of wait states to the LATENCY bits in the FLASH_ACR register */
    __HAL_FLASH_SET_LATENCY(FLatency);
    
    /* Check that the new number of wait states is taken into account to access the Flash
    memory by reading the FLASH_ACR register */
    if((FLASH->ACR & FLASH_ACR_LATENCY) != FLatency)
    {
      return HAL_ERROR;
    }
  }

  /*-------------------------- PCLK1 Configuration ---------------------------*/ 
  if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_PCLK1) == RCC_CLOCKTYPE_PCLK1)
  {
    assert_param(IS_RCC_PCLK(RCC_ClkInitStruct->APB1CLKDivider));
    MODIFY_REG(RCC->CFGR, RCC_CFGR_PPRE1, RCC_ClkInitStruct->APB1CLKDivider);
  }
  
  /*-------------------------- PCLK2 Configuration ---------------------------*/ 
  if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_PCLK2) == RCC_CLOCKTYPE_PCLK2)
  {
    assert_param(IS_RCC_PCLK(RCC_ClkInitStruct->APB2CLKDivider));
    MODIFY_REG(RCC->CFGR, RCC_CFGR_PPRE2, ((RCC_ClkInitStruct->APB2CLKDivider) << 3));
  }

  /* Update the SystemCoreClock global variable */
  SystemCoreClock = HAL_RCC_GetSysClockFreq() >> AHBPrescTable[(RCC->CFGR & RCC_CFGR_HPRE)>> POSITION_VAL(RCC_CFGR_HPRE)];
  
  /* Configure the source of time base considering new system clocks settings*/
  HAL_InitTick (TICK_INT_PRIORITY);
  
  return HAL_OK;
}

void HAL_RCC_MCOConfig(uint32_t RCC_MCOx, uint32_t RCC_MCOSource, uint32_t RCC_MCODiv)
{
  GPIO_InitTypeDef GPIO_InitStruct;
  /* Check the parameters */
  assert_param(IS_RCC_MCO(RCC_MCOx));
  assert_param(IS_RCC_MCODIV(RCC_MCODiv));
  /* RCC_MCO1 */
  if(RCC_MCOx == RCC_MCO1)
  {
    assert_param(IS_RCC_MCO1SOURCE(RCC_MCOSource));
    
    /* MCO1 Clock Enable */
    MCO1_CLK_ENABLE();
    
    /* Configure the MCO1 pin in alternate function mode */    
    GPIO_InitStruct.Pin = MCO1_PIN;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Alternate = GPIO_AF0_MCO;
    HAL_GPIO_Init(MCO1_GPIO_PORT, &GPIO_InitStruct);
    
    /* Mask MCO1 and MCO1PRE[2:0] bits then Select MCO1 clock source and prescaler */
    MODIFY_REG(RCC->CFGR, (RCC_CFGR_MCO1 | RCC_CFGR_MCO1PRE), (RCC_MCOSource | RCC_MCODiv));
  }
  else
  {
    assert_param(IS_RCC_MCO2SOURCE(RCC_MCOSource));
    
    /* MCO2 Clock Enable */
    MCO2_CLK_ENABLE();
    
    /* Configure the MCO2 pin in alternate function mode */
    GPIO_InitStruct.Pin = MCO2_PIN;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Alternate = GPIO_AF0_MCO;
    HAL_GPIO_Init(MCO2_GPIO_PORT, &GPIO_InitStruct);
    
    /* Mask MCO2 and MCO2PRE[2:0] bits then Select MCO2 clock source and prescaler */
    MODIFY_REG(RCC->CFGR, (RCC_CFGR_MCO2 | RCC_CFGR_MCO2PRE), (RCC_MCOSource | (RCC_MCODiv << 3)));
  }
}

void HAL_RCC_EnableCSS(void)
{
  SET_BIT(RCC->CR, RCC_CR_CSSON);
}

void HAL_RCC_DisableCSS(void)
{
  CLEAR_BIT(RCC->CR, RCC_CR_CSSON);
}

uint32_t HAL_RCC_GetSysClockFreq(void)
{
  uint32_t pllm = 0, pllvco = 0, pllp = 0;
  uint32_t sysclockfreq = 0;

  /* Get SYSCLK source -------------------------------------------------------*/
  switch (RCC->CFGR & RCC_CFGR_SWS)
  {
    case RCC_SYSCLKSOURCE_STATUS_HSI:  /* HSI used as system clock source */
    {
      sysclockfreq = HSI_VALUE;
       break;
    }
    case RCC_SYSCLKSOURCE_STATUS_HSE:  /* HSE used as system clock  source */
    {
      sysclockfreq = HSE_VALUE;
      break;
    }
    case RCC_SYSCLKSOURCE_STATUS_PLLCLK:  /* PLL used as system clock  source */
    {
      /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLLM) * PLLN
      SYSCLK = PLL_VCO / PLLP */
      pllm = RCC->PLLCFGR & RCC_PLLCFGR_PLLM;
      if (__HAL_RCC_GET_PLL_OSCSOURCE() != RCC_PLLCFGR_PLLSRC_HSI)
      {
        /* HSE used as PLL clock source */
        pllvco = ((HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> POSITION_VAL(RCC_PLLCFGR_PLLN)));
      }
      else
      {
        /* HSI used as PLL clock source */
        pllvco = ((HSI_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> POSITION_VAL(RCC_PLLCFGR_PLLN)));    
      }
      pllp = ((((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) >> POSITION_VAL(RCC_PLLCFGR_PLLP)) + 1 ) *2);
      
      sysclockfreq = pllvco/pllp;
      break;
    }
    default:
    {
      sysclockfreq = HSI_VALUE;
      break;
    }
  }
  return sysclockfreq;
}

uint32_t HAL_RCC_GetHCLKFreq(void)
{
  return SystemCoreClock;
}

uint32_t HAL_RCC_GetPCLK1Freq(void)
{  
  /* Get HCLK source and Compute PCLK1 frequency ---------------------------*/
  return (HAL_RCC_GetHCLKFreq() >> APBPrescTable[(RCC->CFGR & RCC_CFGR_PPRE1)>> POSITION_VAL(RCC_CFGR_PPRE1)]);
}

uint32_t HAL_RCC_GetPCLK2Freq(void)
{
  /* Get HCLK source and Compute PCLK2 frequency ---------------------------*/
  return (HAL_RCC_GetHCLKFreq()>> APBPrescTable[(RCC->CFGR & RCC_CFGR_PPRE2)>> POSITION_VAL(RCC_CFGR_PPRE2)]);
} 

void HAL_RCC_GetOscConfig(RCC_OscInitTypeDef  *RCC_OscInitStruct)
{
  /* Set all possible values for the Oscillator type parameter ---------------*/
  RCC_OscInitStruct->OscillatorType = RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_LSE | RCC_OSCILLATORTYPE_LSI;
  
  /* Get the HSE configuration -----------------------------------------------*/
  if((RCC->CR &RCC_CR_HSEBYP) == RCC_CR_HSEBYP)
  {
    RCC_OscInitStruct->HSEState = RCC_HSE_BYPASS;
  }
  else if((RCC->CR &RCC_CR_HSEON) == RCC_CR_HSEON)
  {
    RCC_OscInitStruct->HSEState = RCC_HSE_ON;
  }
  else
  {
    RCC_OscInitStruct->HSEState = RCC_HSE_OFF;
  }
  
  /* Get the HSI configuration -----------------------------------------------*/
  if((RCC->CR &RCC_CR_HSION) == RCC_CR_HSION)
  {
    RCC_OscInitStruct->HSIState = RCC_HSI_ON;
  }
  else
  {
    RCC_OscInitStruct->HSIState = RCC_HSI_OFF;
  }
  
  RCC_OscInitStruct->HSICalibrationValue = (uint32_t)((RCC->CR &RCC_CR_HSITRIM) >> POSITION_VAL(RCC_CR_HSITRIM));
  
  /* Get the LSE configuration -----------------------------------------------*/
  if((RCC->BDCR &RCC_BDCR_LSEBYP) == RCC_BDCR_LSEBYP)
  {
    RCC_OscInitStruct->LSEState = RCC_LSE_BYPASS;
  }
  else if((RCC->BDCR &RCC_BDCR_LSEON) == RCC_BDCR_LSEON)
  {
    RCC_OscInitStruct->LSEState = RCC_LSE_ON;
  }
  else
  {
    RCC_OscInitStruct->LSEState = RCC_LSE_OFF;
  }
  
  /* Get the LSI configuration -----------------------------------------------*/
  if((RCC->CSR &RCC_CSR_LSION) == RCC_CSR_LSION)
  {
    RCC_OscInitStruct->LSIState = RCC_LSI_ON;
  }
  else
  {
    RCC_OscInitStruct->LSIState = RCC_LSI_OFF;
  }
  
  /* Get the PLL configuration -----------------------------------------------*/
  if((RCC->CR &RCC_CR_PLLON) == RCC_CR_PLLON)
  {
    RCC_OscInitStruct->PLL.PLLState = RCC_PLL_ON;
  }
  else
  {
    RCC_OscInitStruct->PLL.PLLState = RCC_PLL_OFF;
  }
  RCC_OscInitStruct->PLL.PLLSource = (uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC);
  RCC_OscInitStruct->PLL.PLLM = (uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLM);
  RCC_OscInitStruct->PLL.PLLN = (uint32_t)((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> POSITION_VAL(RCC_PLLCFGR_PLLN));
  RCC_OscInitStruct->PLL.PLLP = (uint32_t)((((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) + RCC_PLLCFGR_PLLP_0) << 1) >> POSITION_VAL(RCC_PLLCFGR_PLLP));
  RCC_OscInitStruct->PLL.PLLQ = (uint32_t)((RCC->PLLCFGR & RCC_PLLCFGR_PLLQ) >> POSITION_VAL(RCC_PLLCFGR_PLLQ));
}

void HAL_RCC_GetClockConfig(RCC_ClkInitTypeDef  *RCC_ClkInitStruct, uint32_t *pFLatency)
{
  /* Set all possible values for the Clock type parameter --------------------*/
  RCC_ClkInitStruct->ClockType = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
   
  /* Get the SYSCLK configuration --------------------------------------------*/ 
  RCC_ClkInitStruct->SYSCLKSource = (uint32_t)(RCC->CFGR & RCC_CFGR_SW);
  
  /* Get the HCLK configuration ----------------------------------------------*/ 
  RCC_ClkInitStruct->AHBCLKDivider = (uint32_t)(RCC->CFGR & RCC_CFGR_HPRE); 
  
  /* Get the APB1 configuration ----------------------------------------------*/ 
  RCC_ClkInitStruct->APB1CLKDivider = (uint32_t)(RCC->CFGR & RCC_CFGR_PPRE1);   
  
  /* Get the APB2 configuration ----------------------------------------------*/ 
  RCC_ClkInitStruct->APB2CLKDivider = (uint32_t)((RCC->CFGR & RCC_CFGR_PPRE2) >> 3);
  
  /* Get the Flash Wait State (Latency) configuration ------------------------*/   
  *pFLatency = (uint32_t)(FLASH->ACR & FLASH_ACR_LATENCY); 
}

void HAL_RCC_NMI_IRQHandler(void)
{
  /* Check RCC CSSF flag  */
  if(__HAL_RCC_GET_IT(RCC_IT_CSS))
  {
    /* RCC Clock Security System interrupt user callback */
    HAL_RCC_CSSCallback();

    /* Clear RCC CSS pending bit */
    __HAL_RCC_CLEAR_IT(RCC_IT_CSS);
  }
}

__weak void HAL_RCC_CSSCallback(void)
{
  /* NOTE : This function Should not be modified, when the callback is needed,
            the HAL_RCC_CSSCallback could be implemented in the user file
   */ 
}

#endif /* HAL_RCC_MODULE_ENABLED */

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