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stmbl/lib/STM32F3xx_HAL_Driver/Src/stm32f3xx_ll_utils.c
Rene Hopf abde8f7017 f3 hal and cmsis update
2018-03-02 04:34:09 +01:00

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/**
******************************************************************************
* @file stm32f3xx_ll_utils.c
* @author MCD Application Team
* @brief UTILS LL module driver.
******************************************************************************
* @attention
*
* <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f3xx_ll_rcc.h"
#include "stm32f3xx_ll_utils.h"
#include "stm32f3xx_ll_system.h"
#include "stm32f3xx_ll_pwr.h"
#ifdef USE_FULL_ASSERT
#include "stm32_assert.h"
#else
#define assert_param(expr) ((void)0U)
#endif
/** @addtogroup STM32F3xx_LL_Driver
* @{
*/
/** @addtogroup UTILS_LL
* @{
*/
/* Private types -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private constants ---------------------------------------------------------*/
/** @addtogroup UTILS_LL_Private_Constants
* @{
*/
/* Defines used for PLL range */
#define UTILS_PLL_OUTPUT_MAX 72000000U /*!< Frequency max for PLL output, in Hz */
/* Defines used for HSE range */
#define UTILS_HSE_FREQUENCY_MIN 4000000U /*!< Frequency min for HSE frequency, in Hz */
#define UTILS_HSE_FREQUENCY_MAX 32000000U /*!< Frequency max for HSE frequency, in Hz */
/* Defines used for FLASH latency according to SYSCLK Frequency */
#define UTILS_LATENCY1_FREQ 24000000U /*!< SYSCLK frequency to set FLASH latency 1 */
#define UTILS_LATENCY2_FREQ 48000000U /*!< SYSCLK frequency to set FLASH latency 2 */
/**
* @}
*/
/* Private macros ------------------------------------------------------------*/
/** @addtogroup UTILS_LL_Private_Macros
* @{
*/
#define IS_LL_UTILS_SYSCLK_DIV(__VALUE__) (((__VALUE__) == LL_RCC_SYSCLK_DIV_1) \
|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_2) \
|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_4) \
|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_8) \
|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_16) \
|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_64) \
|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_128) \
|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_256) \
|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_512))
#define IS_LL_UTILS_APB1_DIV(__VALUE__) (((__VALUE__) == LL_RCC_APB1_DIV_1) \
|| ((__VALUE__) == LL_RCC_APB1_DIV_2) \
|| ((__VALUE__) == LL_RCC_APB1_DIV_4) \
|| ((__VALUE__) == LL_RCC_APB1_DIV_8) \
|| ((__VALUE__) == LL_RCC_APB1_DIV_16))
#define IS_LL_UTILS_APB2_DIV(__VALUE__) (((__VALUE__) == LL_RCC_APB2_DIV_1) \
|| ((__VALUE__) == LL_RCC_APB2_DIV_2) \
|| ((__VALUE__) == LL_RCC_APB2_DIV_4) \
|| ((__VALUE__) == LL_RCC_APB2_DIV_8) \
|| ((__VALUE__) == LL_RCC_APB2_DIV_16))
#define IS_LL_UTILS_PLLMUL_VALUE(__VALUE__) (((__VALUE__) == LL_RCC_PLL_MUL_2) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_3) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_4) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_5) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_6) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_7) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_8) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_9) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_10) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_11) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_12) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_13) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_14) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_15) \
|| ((__VALUE__) == LL_RCC_PLL_MUL_16))
#define IS_LL_UTILS_PREDIV_VALUE(__VALUE__) (((__VALUE__) == LL_RCC_PREDIV_DIV_1) || ((__VALUE__) == LL_RCC_PREDIV_DIV_2) || \
((__VALUE__) == LL_RCC_PREDIV_DIV_3) || ((__VALUE__) == LL_RCC_PREDIV_DIV_4) || \
((__VALUE__) == LL_RCC_PREDIV_DIV_5) || ((__VALUE__) == LL_RCC_PREDIV_DIV_6) || \
((__VALUE__) == LL_RCC_PREDIV_DIV_7) || ((__VALUE__) == LL_RCC_PREDIV_DIV_8) || \
((__VALUE__) == LL_RCC_PREDIV_DIV_9) || ((__VALUE__) == LL_RCC_PREDIV_DIV_10) || \
((__VALUE__) == LL_RCC_PREDIV_DIV_11) || ((__VALUE__) == LL_RCC_PREDIV_DIV_12) || \
((__VALUE__) == LL_RCC_PREDIV_DIV_13) || ((__VALUE__) == LL_RCC_PREDIV_DIV_14) || \
((__VALUE__) == LL_RCC_PREDIV_DIV_15) || ((__VALUE__) == LL_RCC_PREDIV_DIV_16))
#define IS_LL_UTILS_PLL_FREQUENCY(__VALUE__) ((__VALUE__) <= UTILS_PLL_OUTPUT_MAX)
#define IS_LL_UTILS_HSE_BYPASS(__STATE__) (((__STATE__) == LL_UTILS_HSEBYPASS_ON) \
|| ((__STATE__) == LL_UTILS_HSEBYPASS_OFF))
#define IS_LL_UTILS_HSE_FREQUENCY(__FREQUENCY__) (((__FREQUENCY__) >= UTILS_HSE_FREQUENCY_MIN) && ((__FREQUENCY__) <= UTILS_HSE_FREQUENCY_MAX))
/**
* @}
*/
/* Private function prototypes -----------------------------------------------*/
/** @defgroup UTILS_LL_Private_Functions UTILS Private functions
* @{
*/
static uint32_t UTILS_GetPLLOutputFrequency(uint32_t PLL_InputFrequency,
LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct);
#if defined(FLASH_ACR_LATENCY)
static ErrorStatus UTILS_SetFlashLatency(uint32_t Frequency);
#endif /* FLASH_ACR_LATENCY */
static ErrorStatus UTILS_EnablePLLAndSwitchSystem(uint32_t SYSCLK_Frequency, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct);
static ErrorStatus UTILS_PLL_IsBusy(void);
/**
* @}
*/
/* Exported functions --------------------------------------------------------*/
/** @addtogroup UTILS_LL_Exported_Functions
* @{
*/
/** @addtogroup UTILS_LL_EF_DELAY
* @{
*/
/**
* @brief This function configures the Cortex-M SysTick source to have 1ms time base.
* @note When a RTOS is used, it is recommended to avoid changing the Systick
* configuration by calling this function, for a delay use rather osDelay RTOS service.
* @param HCLKFrequency HCLK frequency in Hz
* @note HCLK frequency can be calculated thanks to RCC helper macro or function @ref LL_RCC_GetSystemClocksFreq
* @retval None
*/
void LL_Init1msTick(uint32_t HCLKFrequency)
{
/* Use frequency provided in argument */
LL_InitTick(HCLKFrequency, 1000U);
}
/**
* @brief This function provides accurate delay (in milliseconds) based
* on SysTick counter flag
* @note When a RTOS is used, it is recommended to avoid using blocking delay
* and use rather osDelay service.
* @note To respect 1ms timebase, user should call @ref LL_Init1msTick function which
* will configure Systick to 1ms
* @param Delay specifies the delay time length, in milliseconds.
* @retval None
*/
void LL_mDelay(uint32_t Delay)
{
__IO uint32_t tmp = SysTick->CTRL; /* Clear the COUNTFLAG first */
/* Add this code to indicate that local variable is not used */
((void)tmp);
/* Add a period to guaranty minimum wait */
if (Delay < LL_MAX_DELAY)
{
Delay++;
}
while (Delay)
{
if ((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) != 0U)
{
Delay--;
}
}
}
/**
* @}
*/
/** @addtogroup UTILS_EF_SYSTEM
* @brief System Configuration functions
*
@verbatim
===============================================================================
##### System Configuration functions #####
===============================================================================
[..]
System, AHB and APB buses clocks configuration
(+) The maximum frequency of the SYSCLK, HCLK, PCLK1 and PCLK2 is 72000000 Hz.
@endverbatim
@internal
Depending on the SYSCLK frequency, the flash latency should be adapted accordingly:
(++) +-----------------------------------------------+
(++) | Latency | SYSCLK clock frequency (MHz) |
(++) |---------------|-------------------------------|
(++) |0WS(1CPU cycle)| 0 < SYSCLK <= 24 |
(++) |---------------|-------------------------------|
(++) |1WS(2CPU cycle)| 24 < SYSCLK <= 48 |
(++) |---------------|-------------------------------|
(++) |2WS(3CPU cycle)| 48 < SYSCLK <= 72 |
(++) +-----------------------------------------------+
@endinternal
* @{
*/
/**
* @brief This function sets directly SystemCoreClock CMSIS variable.
* @note Variable can be calculated also through SystemCoreClockUpdate function.
* @param HCLKFrequency HCLK frequency in Hz (can be calculated thanks to RCC helper macro)
* @retval None
*/
void LL_SetSystemCoreClock(uint32_t HCLKFrequency)
{
/* HCLK clock frequency */
SystemCoreClock = HCLKFrequency;
}
/**
* @brief This function configures system clock with HSI as clock source of the PLL
* @note The application need to ensure that PLL is disabled.
* @note Function is based on the following formula:
* - PLL output frequency = ((HSI frequency / PREDIV) * PLLMUL)
* - PREDIV: Set to 2 for few devices
* - PLLMUL: The application software must set correctly the PLL multiplication factor to
* not exceed 72MHz
* @note FLASH latency can be modified through this function.
* @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains
* the configuration information for the PLL.
* @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains
* the configuration information for the BUS prescalers.
* @retval An ErrorStatus enumeration value:
* - SUCCESS: Max frequency configuration done
* - ERROR: Max frequency configuration not done
*/
ErrorStatus LL_PLL_ConfigSystemClock_HSI(LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct,
LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct)
{
ErrorStatus status = SUCCESS;
uint32_t pllfreq = 0U;
/* Check if one of the PLL is enabled */
if (UTILS_PLL_IsBusy() == SUCCESS)
{
#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
/* Check PREDIV value */
assert_param(IS_LL_UTILS_PREDIV_VALUE(UTILS_PLLInitStruct->PLLDiv));
#else
/* Force PREDIV value to 2 */
UTILS_PLLInitStruct->Prediv = LL_RCC_PREDIV_DIV_2;
#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
/* Calculate the new PLL output frequency */
pllfreq = UTILS_GetPLLOutputFrequency(HSI_VALUE, UTILS_PLLInitStruct);
/* Enable HSI if not enabled */
if (LL_RCC_HSI_IsReady() != 1U)
{
LL_RCC_HSI_Enable();
while (LL_RCC_HSI_IsReady() != 1U)
{
/* Wait for HSI ready */
}
}
/* Configure PLL */
#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI, UTILS_PLLInitStruct->PLLMul, UTILS_PLLInitStruct->PLLDiv);
#else
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI_DIV_2, UTILS_PLLInitStruct->PLLMul);
#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
/* Enable PLL and switch system clock to PLL */
status = UTILS_EnablePLLAndSwitchSystem(pllfreq, UTILS_ClkInitStruct);
}
else
{
/* Current PLL configuration cannot be modified */
status = ERROR;
}
return status;
}
/**
* @brief This function configures system clock with HSE as clock source of the PLL
* @note The application need to ensure that PLL is disabled.
* @note Function is based on the following formula:
* - PLL output frequency = ((HSI frequency / PREDIV) * PLLMUL)
* - PREDIV: Set to 2 for few devices
* - PLLMUL: The application software must set correctly the PLL multiplication factor to
* not exceed @ref UTILS_PLL_OUTPUT_MAX
* @note FLASH latency can be modified through this function.
* @param HSEFrequency Value between Min_Data = 4000000 and Max_Data = 32000000
* @param HSEBypass This parameter can be one of the following values:
* @arg @ref LL_UTILS_HSEBYPASS_ON
* @arg @ref LL_UTILS_HSEBYPASS_OFF
* @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains
* the configuration information for the PLL.
* @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains
* the configuration information for the BUS prescalers.
* @retval An ErrorStatus enumeration value:
* - SUCCESS: Max frequency configuration done
* - ERROR: Max frequency configuration not done
*/
ErrorStatus LL_PLL_ConfigSystemClock_HSE(uint32_t HSEFrequency, uint32_t HSEBypass,
LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct)
{
ErrorStatus status = SUCCESS;
uint32_t pllfreq = 0U;
/* Check the parameters */
assert_param(IS_LL_UTILS_HSE_FREQUENCY(HSEFrequency));
assert_param(IS_LL_UTILS_HSE_BYPASS(HSEBypass));
/* Check if one of the PLL is enabled */
if (UTILS_PLL_IsBusy() == SUCCESS)
{
/* Check PREDIV value */
#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
assert_param(IS_LL_UTILS_PREDIV_VALUE(UTILS_PLLInitStruct->PLLDiv));
#else
assert_param(IS_LL_UTILS_PREDIV_VALUE(UTILS_PLLInitStruct->Prediv));
#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
/* Calculate the new PLL output frequency */
pllfreq = UTILS_GetPLLOutputFrequency(HSEFrequency, UTILS_PLLInitStruct);
/* Enable HSE if not enabled */
if (LL_RCC_HSE_IsReady() != 1U)
{
/* Check if need to enable HSE bypass feature or not */
if (HSEBypass == LL_UTILS_HSEBYPASS_ON)
{
LL_RCC_HSE_EnableBypass();
}
else
{
LL_RCC_HSE_DisableBypass();
}
/* Enable HSE */
LL_RCC_HSE_Enable();
while (LL_RCC_HSE_IsReady() != 1U)
{
/* Wait for HSE ready */
}
}
/* Configure PLL */
#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, UTILS_PLLInitStruct->PLLMul, UTILS_PLLInitStruct->PLLDiv);
#else
LL_RCC_PLL_ConfigDomain_SYS((RCC_CFGR_PLLSRC_HSE_PREDIV | UTILS_PLLInitStruct->Prediv), UTILS_PLLInitStruct->PLLMul);
#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
/* Enable PLL and switch system clock to PLL */
status = UTILS_EnablePLLAndSwitchSystem(pllfreq, UTILS_ClkInitStruct);
}
else
{
/* Current PLL configuration cannot be modified */
status = ERROR;
}
return status;
}
/**
* @}
*/
/**
* @}
*/
/** @addtogroup UTILS_LL_Private_Functions
* @{
*/
/**
* @brief Update number of Flash wait states in line with new frequency and current
voltage range.
* @param Frequency SYSCLK frequency
* @retval An ErrorStatus enumeration value:
* - SUCCESS: Latency has been modified
* - ERROR: Latency cannot be modified
*/
#if defined(FLASH_ACR_LATENCY)
static ErrorStatus UTILS_SetFlashLatency(uint32_t Frequency)
{
ErrorStatus status = SUCCESS;
uint32_t latency = LL_FLASH_LATENCY_0; /* default value 0WS */
/* Frequency cannot be equal to 0 */
if (Frequency == 0U)
{
status = ERROR;
}
else
{
if (Frequency > UTILS_LATENCY2_FREQ)
{
/* 48 < SYSCLK <= 72 => 2WS (3 CPU cycles) */
latency = LL_FLASH_LATENCY_2;
}
else
{
if (Frequency > UTILS_LATENCY1_FREQ)
{
/* 24 < SYSCLK <= 48 => 1WS (2 CPU cycles) */
latency = LL_FLASH_LATENCY_1;
}
/* else SYSCLK < 24MHz default LL_FLASH_LATENCY_0 0WS */
}
LL_FLASH_SetLatency(latency);
/* Check that the new number of wait states is taken into account to access the Flash
memory by reading the FLASH_ACR register */
if (LL_FLASH_GetLatency() != latency)
{
status = ERROR;
}
}
return status;
}
#endif /* FLASH_ACR_LATENCY */
/**
* @brief Function to check that PLL can be modified
* @param PLL_InputFrequency PLL input frequency (in Hz)
* @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains
* the configuration information for the PLL.
* @retval PLL output frequency (in Hz)
*/
static uint32_t UTILS_GetPLLOutputFrequency(uint32_t PLL_InputFrequency, LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct)
{
uint32_t pllfreq = 0U;
/* Check the parameters */
assert_param(IS_LL_UTILS_PLLMUL_VALUE(UTILS_PLLInitStruct->PLLMul));
/* Check different PLL parameters according to RM */
/* The application software must set correctly the PLL multiplication factor to
not exceed @ref UTILS_PLL_OUTPUT_MAX */
#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
pllfreq = __LL_RCC_CALC_PLLCLK_FREQ(PLL_InputFrequency, UTILS_PLLInitStruct->PLLMul, UTILS_PLLInitStruct->PLLDiv);
#else
pllfreq = __LL_RCC_CALC_PLLCLK_FREQ(PLL_InputFrequency / (UTILS_PLLInitStruct->Prediv + 1U), UTILS_PLLInitStruct->PLLMul);
#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
assert_param(IS_LL_UTILS_PLL_FREQUENCY(pllfreq));
return pllfreq;
}
/**
* @brief Function to check that PLL can be modified
* @retval An ErrorStatus enumeration value:
* - SUCCESS: PLL modification can be done
* - ERROR: PLL is busy
*/
static ErrorStatus UTILS_PLL_IsBusy(void)
{
ErrorStatus status = SUCCESS;
/* Check if PLL is busy*/
if (LL_RCC_PLL_IsReady() != 0U)
{
/* PLL configuration cannot be modified */
status = ERROR;
}
return status;
}
/**
* @brief Function to enable PLL and switch system clock to PLL
* @param SYSCLK_Frequency SYSCLK frequency
* @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains
* the configuration information for the BUS prescalers.
* @retval An ErrorStatus enumeration value:
* - SUCCESS: No problem to switch system to PLL
* - ERROR: Problem to switch system to PLL
*/
static ErrorStatus UTILS_EnablePLLAndSwitchSystem(uint32_t SYSCLK_Frequency, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct)
{
ErrorStatus status = SUCCESS;
uint32_t sysclk_frequency_current = 0U;
assert_param(IS_LL_UTILS_SYSCLK_DIV(UTILS_ClkInitStruct->AHBCLKDivider));
assert_param(IS_LL_UTILS_APB1_DIV(UTILS_ClkInitStruct->APB1CLKDivider));
assert_param(IS_LL_UTILS_APB2_DIV(UTILS_ClkInitStruct->APB2CLKDivider));
/* Calculate current SYSCLK frequency */
sysclk_frequency_current = (SystemCoreClock << AHBPrescTable[LL_RCC_GetAHBPrescaler() >> RCC_POSITION_HPRE]);
/* Increasing the number of wait states because of higher CPU frequency */
if (sysclk_frequency_current < SYSCLK_Frequency)
{
/* Set FLASH latency to highest latency */
status = UTILS_SetFlashLatency(SYSCLK_Frequency);
}
/* Update system clock configuration */
if (status == SUCCESS)
{
/* Enable PLL */
LL_RCC_PLL_Enable();
while (LL_RCC_PLL_IsReady() != 1U)
{
/* Wait for PLL ready */
}
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(UTILS_ClkInitStruct->AHBCLKDivider);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
/* Wait for system clock switch to PLL */
}
/* Set APB1 & APB2 prescaler*/
LL_RCC_SetAPB1Prescaler(UTILS_ClkInitStruct->APB1CLKDivider);
LL_RCC_SetAPB2Prescaler(UTILS_ClkInitStruct->APB2CLKDivider);
}
/* Decreasing the number of wait states because of lower CPU frequency */
if (sysclk_frequency_current > SYSCLK_Frequency)
{
/* Set FLASH latency to lowest latency */
status = UTILS_SetFlashLatency(SYSCLK_Frequency);
}
/* Update SystemCoreClock variable */
if (status == SUCCESS)
{
LL_SetSystemCoreClock(__LL_RCC_CALC_HCLK_FREQ(SYSCLK_Frequency, UTILS_ClkInitStruct->AHBCLKDivider));
}
return status;
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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