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openblt/Target/Demo/ARMCM3_STM32F2_Olimex_STM32.../Boot/Drivers/STM32F2xx_HAL_Driver/Src/stm32f2xx_ll_rcc.c

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/**
******************************************************************************
* @file stm32f2xx_ll_rcc.c
* @author MCD Application Team
* @brief RCC LL module driver.
******************************************************************************
* @attention
*
* <h2><center>&copy; Copyright (c) 2017 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 "stm32f2xx_ll_rcc.h"
#ifdef USE_FULL_ASSERT
#include "stm32_assert.h"
#else
#define assert_param(expr) ((void)0U)
#endif
/** @addtogroup STM32F2xx_LL_Driver
* @{
*/
#if defined(RCC)
/** @addtogroup RCC_LL
* @{
*/
/* Private types -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private constants ---------------------------------------------------------*/
/* Private macros ------------------------------------------------------------*/
/** @addtogroup RCC_LL_Private_Macros
* @{
*/
#define IS_LL_RCC_I2S_CLKSOURCE(__VALUE__) (((__VALUE__) == LL_RCC_I2S1_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);
uint32_t RCC_PLL_GetFreqDomain_48M(void);
uint32_t RCC_PLLI2S_GetFreqDomain_I2S(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, PLL, PLLI2S 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)
{
uint32_t vl_mask = 0U;
/* Set HSION bit */
LL_RCC_HSI_Enable();
/* Wait for HSI READY bit */
while(LL_RCC_HSI_IsReady() != 1U)
{}
/* Reset CFGR register */
LL_RCC_WriteReg(CFGR, 0x00000000U);
vl_mask = 0xFFFFFFFFU;
/* Reset HSEON, PLLSYSON bits */
CLEAR_BIT(vl_mask, (RCC_CR_HSEON | RCC_CR_HSEBYP | RCC_CR_PLLON | RCC_CR_CSSON));
/* Reset PLLI2SON bit */
CLEAR_BIT(vl_mask, RCC_CR_PLLI2SON);
/* Write new mask in CR register */
LL_RCC_WriteReg(CR, vl_mask);
/* Set HSITRIM bits to the reset value*/
LL_RCC_HSI_SetCalibTrimming(0x10U);
/* Wait for PLL READY bit to be reset */
while(LL_RCC_PLL_IsReady() != 0U)
{}
/* Wait for PLLI2S READY bit to be reset */
while(LL_RCC_PLLI2S_IsReady() != 0U)
{}
/* Reset PLLCFGR register */
LL_RCC_WriteReg(PLLCFGR, 0x24003010U);
/* Reset PLLI2SCFGR register */
LL_RCC_WriteReg(PLLI2SCFGR, 0x20003000U);
/* 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 HSE_VALUE(***)
* or HSI_VALUE(**) multiplied/divided by the PLL factors.
* @note (**) HSI_VALUE is a constant defined in this file (default value
* 16 MHz) but the real value may vary depending on the variations
* in voltage and temperature.
* @note (***) HSE_VALUE is a constant defined in this file (default value
* 25 MHz), 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);
}
/**
* @brief Return I2Sx clock frequency
* @param I2SxSource This parameter can be one of the following values:
* @arg @ref LL_RCC_I2S1_CLKSOURCE
* @retval I2S clock frequency (in Hz)
* - @ref LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator is not ready
*/
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));
if (I2SxSource == LL_RCC_I2S1_CLKSOURCE)
{
/* I2S1 CLK clock frequency */
switch (LL_RCC_GetI2SClockSource(I2SxSource))
{
case LL_RCC_I2S1_CLKSOURCE_PLLI2S: /* I2S1 Clock is PLLI2S */
if (LL_RCC_PLLI2S_IsReady())
{
i2s_frequency = RCC_PLLI2S_GetFreqDomain_I2S();
}
break;
case LL_RCC_I2S1_CLKSOURCE_PIN: /* I2S1 Clock is External clock */
default:
i2s_frequency = EXTERNAL_CLOCK_VALUE;
break;
}
}
return i2s_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 or HSI_VALUE / PLLM) * PLLN
*/
pllsource = LL_RCC_PLL_GetMainSource();
switch (pllsource)
{
case LL_RCC_PLLSOURCE_HSI: /* HSI used as PLL clock source */
pllinputfreq = HSI_VALUE;
break;
case LL_RCC_PLLSOURCE_HSE: /* HSE used as PLL clock source */
pllinputfreq = HSE_VALUE;
break;
default:
pllinputfreq = HSI_VALUE;
break;
}
return __LL_RCC_CALC_PLLCLK_FREQ(pllinputfreq, LL_RCC_PLL_GetDivider(),
LL_RCC_PLL_GetN(), LL_RCC_PLL_GetP());
}
/**
* @brief Return PLL clock frequency used for 48 MHz domain
* @retval PLL clock frequency (in Hz)
*/
uint32_t RCC_PLL_GetFreqDomain_48M(void)
{
uint32_t pllinputfreq = 0U, pllsource = 0U;
/* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLLM ) * PLLN
48M Domain clock = PLL_VCO / PLLQ
*/
pllsource = LL_RCC_PLL_GetMainSource();
switch (pllsource)
{
case LL_RCC_PLLSOURCE_HSI: /* HSI used as PLL clock source */
pllinputfreq = HSI_VALUE;
break;
case LL_RCC_PLLSOURCE_HSE: /* HSE used as PLL clock source */
pllinputfreq = HSE_VALUE;
break;
default:
pllinputfreq = HSI_VALUE;
break;
}
return __LL_RCC_CALC_PLLCLK_48M_FREQ(pllinputfreq, LL_RCC_PLL_GetDivider(),
LL_RCC_PLL_GetN(), LL_RCC_PLL_GetQ());
}
/**
* @brief Return PLLI2S clock frequency used for I2S domain
* @retval PLLI2S clock frequency (in Hz)
*/
uint32_t RCC_PLLI2S_GetFreqDomain_I2S(void)
{
uint32_t pllinputfreq = 0U, pllsource = 0U;
/* PLLI2S_VCO = (HSE_VALUE or HSI_VALUE / PLLM) * PLLI2SN
I2S Domain clock = PLLI2S_VCO / PLLI2SR
*/
pllsource = LL_RCC_PLL_GetMainSource();
switch (pllsource)
{
case LL_RCC_PLLSOURCE_HSE: /* HSE used as PLLI2S clock source */
pllinputfreq = HSE_VALUE;
break;
case LL_RCC_PLLSOURCE_HSI: /* HSI used as PLLI2S clock source */
default:
pllinputfreq = HSI_VALUE;
break;
}
return __LL_RCC_CALC_PLLI2S_I2S_FREQ(pllinputfreq, LL_RCC_PLL_GetDivider(),
LL_RCC_PLLI2S_GetN(), LL_RCC_PLLI2S_GetR());
}
/**
* @}
*/
/**
* @}
*/
#endif /* defined(RCC) */
/**
* @}
*/
#endif /* USE_FULL_LL_DRIVER */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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