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-/**
- ******************************************************************************
- * @file system_stm32f0xx.c
- * @author MCD Application Team
- * @brief CMSIS Cortex-M0 Device Peripheral Access Layer System Source File.
- *
- * 1. This file provides two functions and one global variable to be called from
- * user application:
- * - SystemInit(): This function is called at startup just after reset and
- * before branch to main program. This call is made inside
- * the "startup_stm32f0xx.s" file.
- *
- * - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
- * by the user application to setup the SysTick
- * timer or configure other parameters.
- *
- * - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
- * be called whenever the core clock is changed
- * during program execution.
- *
- *
- ******************************************************************************
- * @attention
- *
- * <h2><center>&copy; Copyright (c) 2016 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
- *
- ******************************************************************************
- */
-
-/** @addtogroup CMSIS
- * @{
- */
-
-/** @addtogroup stm32f0xx_system
- * @{
- */
-
-/** @addtogroup STM32F0xx_System_Private_Includes
- * @{
- */
-
-#include "stm32f0xx.h"
-
-/**
- * @}
- */
-
-/** @addtogroup STM32F0xx_System_Private_TypesDefinitions
- * @{
- */
-
-/**
- * @}
- */
-
-/** @addtogroup STM32F0xx_System_Private_Defines
- * @{
- */
-#if !defined (HSE_VALUE)
- #define HSE_VALUE ((uint32_t)8000000) /*!< Default value of the External oscillator in Hz.
- This value can be provided and adapted by the user application. */
-#endif /* HSE_VALUE */
-
-#if !defined (HSI_VALUE)
- #define HSI_VALUE ((uint32_t)8000000) /*!< Default value of the Internal oscillator in Hz.
- This value can be provided and adapted by the user application. */
-#endif /* HSI_VALUE */
-
-#if !defined (HSI48_VALUE)
-#define HSI48_VALUE ((uint32_t)48000000) /*!< Default value of the HSI48 Internal oscillator in Hz.
- This value can be provided and adapted by the user application. */
-#endif /* HSI48_VALUE */
-/**
- * @}
- */
-
-/** @addtogroup STM32F0xx_System_Private_Macros
- * @{
- */
-
-/**
- * @}
- */
-
-/** @addtogroup STM32F0xx_System_Private_Variables
- * @{
- */
- /* This variable is updated in three ways:
- 1) by calling CMSIS function SystemCoreClockUpdate()
- 2) by calling HAL API function HAL_RCC_GetHCLKFreq()
- 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
- Note: If you use this function to configure the system clock; then there
- is no need to call the 2 first functions listed above, since SystemCoreClock
- variable is updated automatically.
- */
-uint32_t SystemCoreClock = 8000000;
-
-const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
-const uint8_t APBPrescTable[8] = {0, 0, 0, 0, 1, 2, 3, 4};
-
-/**
- * @}
- */
-
-/** @addtogroup STM32F0xx_System_Private_FunctionPrototypes
- * @{
- */
-
-/**
- * @}
- */
-
-/** @addtogroup STM32F0xx_System_Private_Functions
- * @{
- */
-
-/**
- * @brief Setup the microcontroller system
- * @param None
- * @retval None
- */
-void SystemInit(void)
-{
- /* NOTE :SystemInit(): This function is called at startup just after reset and
- before branch to main program. This call is made inside
- the "startup_stm32f0xx.s" file.
- User can setups the default system clock (System clock source, PLL Multiplier
- and Divider factors, AHB/APBx prescalers and Flash settings).
- */
-}
-
-/**
- * @brief Update SystemCoreClock variable according to Clock Register Values.
- * The SystemCoreClock variable contains the core clock (HCLK), it can
- * be used by the user application to setup the SysTick timer or configure
- * other parameters.
- *
- * @note Each time the core clock (HCLK) changes, this function must be called
- * to update SystemCoreClock variable value. Otherwise, any configuration
- * based on this variable will be incorrect.
- *
- * @note - The system frequency computed by this function is not the real
- * frequency in the chip. It is calculated based on the predefined
- * constant and the selected clock source:
- *
- * - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
- *
- * - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
- *
- * - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**)
- * or HSI_VALUE(*) multiplied/divided by the PLL factors.
- *
- * (*) HSI_VALUE is a constant defined in stm32f0xx_hal_conf.h file (default value
- * 8 MHz) but the real value may vary depending on the variations
- * in voltage and temperature.
- *
- * (**) HSE_VALUE is a constant defined in stm32f0xx_hal_conf.h file (its value
- * depends on the application requirements), user has to ensure that HSE_VALUE
- * is same as the real frequency of the crystal used. Otherwise, this function
- * may have wrong result.
- *
- * - The result of this function could be not correct when using fractional
- * value for HSE crystal.
- *
- * @param None
- * @retval None
- */
-void SystemCoreClockUpdate (void)
-{
- uint32_t tmp = 0, pllmull = 0, pllsource = 0, predivfactor = 0;
-
- /* Get SYSCLK source -------------------------------------------------------*/
- tmp = RCC->CFGR & RCC_CFGR_SWS;
-
- switch (tmp)
- {
- case RCC_CFGR_SWS_HSI: /* HSI used as system clock */
- SystemCoreClock = HSI_VALUE;
- break;
- case RCC_CFGR_SWS_HSE: /* HSE used as system clock */
- SystemCoreClock = HSE_VALUE;
- break;
- case RCC_CFGR_SWS_PLL: /* PLL used as system clock */
- /* Get PLL clock source and multiplication factor ----------------------*/
- pllmull = RCC->CFGR & RCC_CFGR_PLLMUL;
- pllsource = RCC->CFGR & RCC_CFGR_PLLSRC;
- pllmull = ( pllmull >> 18) + 2;
- predivfactor = (RCC->CFGR2 & RCC_CFGR2_PREDIV) + 1;
-
- if (pllsource == RCC_CFGR_PLLSRC_HSE_PREDIV)
- {
- /* HSE used as PLL clock source : SystemCoreClock = HSE/PREDIV * PLLMUL */
- SystemCoreClock = (HSE_VALUE/predivfactor) * pllmull;
- }
-#if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F072xB) || defined(STM32F078xx) || defined(STM32F091xC) || defined(STM32F098xx)
- else if (pllsource == RCC_CFGR_PLLSRC_HSI48_PREDIV)
- {
- /* HSI48 used as PLL clock source : SystemCoreClock = HSI48/PREDIV * PLLMUL */
- SystemCoreClock = (HSI48_VALUE/predivfactor) * pllmull;
- }
-#endif /* STM32F042x6 || STM32F048xx || STM32F072xB || STM32F078xx || STM32F091xC || STM32F098xx */
- else
- {
-#if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F070x6) \
- || defined(STM32F078xx) || defined(STM32F071xB) || defined(STM32F072xB) \
- || defined(STM32F070xB) || defined(STM32F091xC) || defined(STM32F098xx) || defined(STM32F030xC)
- /* HSI used as PLL clock source : SystemCoreClock = HSI/PREDIV * PLLMUL */
- SystemCoreClock = (HSI_VALUE/predivfactor) * pllmull;
-#else
- /* HSI used as PLL clock source : SystemCoreClock = HSI/2 * PLLMUL */
- SystemCoreClock = (HSI_VALUE >> 1) * pllmull;
-#endif /* STM32F042x6 || STM32F048xx || STM32F070x6 ||
- STM32F071xB || STM32F072xB || STM32F078xx || STM32F070xB ||
- STM32F091xC || STM32F098xx || STM32F030xC */
- }
- break;
- default: /* HSI used as system clock */
- SystemCoreClock = HSI_VALUE;
- break;
- }
- /* Compute HCLK clock frequency ----------------*/
- /* Get HCLK prescaler */
- tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)];
- /* HCLK clock frequency */
- SystemCoreClock >>= tmp;
-}
-
-/**
- * @}
- */
-
-/**
- * @}
- */
-
-/**
- * @}
- */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
-