/**
******************************************************************************
* @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 */