From 343e88525d1d13a6da5629d7137b2d8a15f9d2d8 Mon Sep 17 00:00:00 2001 From: Clyhtsuriva Date: Sun, 24 Jan 2021 23:56:07 +0100 Subject: Adding the whole Core --- Core/Src/system_stm32l0xx.c | 275 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 275 insertions(+) create mode 100644 Core/Src/system_stm32l0xx.c (limited to 'Core/Src/system_stm32l0xx.c') diff --git a/Core/Src/system_stm32l0xx.c b/Core/Src/system_stm32l0xx.c new file mode 100644 index 0000000..9189ed8 --- /dev/null +++ b/Core/Src/system_stm32l0xx.c @@ -0,0 +1,275 @@ +/** + ****************************************************************************** + * @file system_stm32l0xx.c + * @author MCD Application Team + * @brief CMSIS Cortex-M0+ Device Peripheral Access Layer System Source File. + * + * 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_stm32l0xx.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 + * + *

© Copyright(c) 2016 STMicroelectronics. + * All rights reserved.

+ * + * 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 stm32l0xx_system + * @{ + */ + +/** @addtogroup STM32L0xx_System_Private_Includes + * @{ + */ + +#include "stm32l0xx.h" + +#if !defined (HSE_VALUE) + #define HSE_VALUE ((uint32_t)8000000U) /*!< Value of the External oscillator in Hz */ +#endif /* HSE_VALUE */ + +#if !defined (MSI_VALUE) + #define MSI_VALUE ((uint32_t)2097152U) /*!< Value of the Internal oscillator in Hz*/ +#endif /* MSI_VALUE */ + +#if !defined (HSI_VALUE) + #define HSI_VALUE ((uint32_t)16000000U) /*!< Value of the Internal oscillator in Hz*/ +#endif /* HSI_VALUE */ + + +/** + * @} + */ + +/** @addtogroup STM32L0xx_System_Private_TypesDefinitions + * @{ + */ + +/** + * @} + */ + +/** @addtogroup STM32L0xx_System_Private_Defines + * @{ + */ +/************************* Miscellaneous Configuration ************************/ + +/* Note: Following vector table addresses must be defined in line with linker + configuration. */ +/*!< Uncomment the following line if you need to relocate the vector table + anywhere in Flash or Sram, else the vector table is kept at the automatic + remap of boot address selected */ +/* #define USER_VECT_TAB_ADDRESS */ + +#if defined(USER_VECT_TAB_ADDRESS) +/*!< Uncomment the following line if you need to relocate your vector Table + in Sram else user remap will be done in Flash. */ +/* #define VECT_TAB_SRAM */ +#if defined(VECT_TAB_SRAM) +#define VECT_TAB_BASE_ADDRESS SRAM_BASE /*!< Vector Table base address field. + This value must be a multiple of 0x200. */ +#define VECT_TAB_OFFSET 0x00000000U /*!< Vector Table base offset field. + This value must be a multiple of 0x200. */ +#else +#define VECT_TAB_BASE_ADDRESS FLASH_BASE /*!< Vector Table base address field. + This value must be a multiple of 0x200. */ +#define VECT_TAB_OFFSET 0x00000000U /*!< Vector Table base offset field. + This value must be a multiple of 0x200. */ +#endif /* VECT_TAB_SRAM */ +#endif /* USER_VECT_TAB_ADDRESS */ + +/******************************************************************************/ +/** + * @} + */ + +/** @addtogroup STM32L0xx_System_Private_Macros + * @{ + */ + +/** + * @} + */ + +/** @addtogroup STM32L0xx_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 = 2097152U; /* 32.768 kHz * 2^6 */ + const uint8_t AHBPrescTable[16] = {0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, 1U, 2U, 3U, 4U, 6U, 7U, 8U, 9U}; + const uint8_t APBPrescTable[8] = {0U, 0U, 0U, 0U, 1U, 2U, 3U, 4U}; + const uint8_t PLLMulTable[9] = {3U, 4U, 6U, 8U, 12U, 16U, 24U, 32U, 48U}; + +/** + * @} + */ + +/** @addtogroup STM32L0xx_System_Private_FunctionPrototypes + * @{ + */ + +/** + * @} + */ + +/** @addtogroup STM32L0xx_System_Private_Functions + * @{ + */ + +/** + * @brief Setup the microcontroller system. + * @param None + * @retval None + */ +void SystemInit (void) +{ + /* Configure the Vector Table location add offset address ------------------*/ +#if defined (USER_VECT_TAB_ADDRESS) + SCB->VTOR = VECT_TAB_BASE_ADDRESS | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */ +#endif /* USER_VECT_TAB_ADDRESS */ +} + +/** + * @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 MSI, SystemCoreClock will contain the MSI + * value as defined by the MSI range. + * + * - 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 stm32l0xx_hal.h file (default value + * 16 MHz) but the real value may vary depending on the variations + * in voltage and temperature. + * + * (**) HSE_VALUE is a constant defined in stm32l0xx_hal.h file (default value + * 8 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. + * + * - 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 = 0U, pllmul = 0U, plldiv = 0U, pllsource = 0U, msirange = 0U; + + /* Get SYSCLK source -------------------------------------------------------*/ + tmp = RCC->CFGR & RCC_CFGR_SWS; + + switch (tmp) + { + case 0x00U: /* MSI used as system clock */ + msirange = (RCC->ICSCR & RCC_ICSCR_MSIRANGE) >> RCC_ICSCR_MSIRANGE_Pos; + SystemCoreClock = (32768U * (1U << (msirange + 1U))); + break; + case 0x04U: /* HSI used as system clock */ + if ((RCC->CR & RCC_CR_HSIDIVF) != 0U) + { + SystemCoreClock = HSI_VALUE / 4U; + } + else + { + SystemCoreClock = HSI_VALUE; + } + break; + case 0x08U: /* HSE used as system clock */ + SystemCoreClock = HSE_VALUE; + break; + default: /* PLL used as system clock */ + /* Get PLL clock source and multiplication factor ----------------------*/ + pllmul = RCC->CFGR & RCC_CFGR_PLLMUL; + plldiv = RCC->CFGR & RCC_CFGR_PLLDIV; + pllmul = PLLMulTable[(pllmul >> RCC_CFGR_PLLMUL_Pos)]; + plldiv = (plldiv >> RCC_CFGR_PLLDIV_Pos) + 1U; + + pllsource = RCC->CFGR & RCC_CFGR_PLLSRC; + + if (pllsource == 0x00U) + { + /* HSI oscillator clock selected as PLL clock entry */ + if ((RCC->CR & RCC_CR_HSIDIVF) != 0U) + { + SystemCoreClock = (((HSI_VALUE / 4U) * pllmul) / plldiv); + } + else + { + SystemCoreClock = (((HSI_VALUE) * pllmul) / plldiv); + } + } + else + { + /* HSE selected as PLL clock entry */ + SystemCoreClock = (((HSE_VALUE) * pllmul) / plldiv); + } + break; + } + /* Compute HCLK clock frequency --------------------------------------------*/ + /* Get HCLK prescaler */ + tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> RCC_CFGR_HPRE_Pos)]; + /* HCLK clock frequency */ + SystemCoreClock >>= tmp; +} + + + +/** + * @} + */ + +/** + * @} + */ + +/** + * @} + */ + +/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ -- cgit v1.2.3