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Diffstat (limited to 'stm32f091/esp/Src/system_stm32f0xx.c')
| -rw-r--r-- | stm32f091/esp/Src/system_stm32f0xx.c | 246 |
1 files changed, 0 insertions, 246 deletions
diff --git a/stm32f091/esp/Src/system_stm32f0xx.c b/stm32f091/esp/Src/system_stm32f0xx.c deleted file mode 100644 index add4405..0000000 --- a/stm32f091/esp/Src/system_stm32f0xx.c +++ /dev/null @@ -1,246 +0,0 @@ -/** - ****************************************************************************** - * @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>© 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****/ - |