/** ****************************************************************************** * @file system_stm32wbxx.c * @author MCD Application Team * @brief CMSIS Cortex 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_stm32wbxx.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. * * After each device reset the MSI (4 MHz) is used as system clock source. * Then SystemInit() function is called, in "startup_stm32wbxx.s" file, to * configure the system clock before to branch to main program. * * This file configures the system clock as follows: *============================================================================= *----------------------------------------------------------------------------- * System Clock source | MSI *----------------------------------------------------------------------------- * SYSCLK(Hz) | 4000000 *----------------------------------------------------------------------------- * HCLK(Hz) | 4000000 *----------------------------------------------------------------------------- * AHB Prescaler | 1 *----------------------------------------------------------------------------- * APB1 Prescaler | 1 *----------------------------------------------------------------------------- * APB2 Prescaler | 1 *----------------------------------------------------------------------------- * PLL_M | 1 *----------------------------------------------------------------------------- * PLL_N | 8 *----------------------------------------------------------------------------- * PLL_P | 7 *----------------------------------------------------------------------------- * PLL_Q | 2 *----------------------------------------------------------------------------- * PLL_R | 2 *----------------------------------------------------------------------------- * PLLSAI1_P | NA *----------------------------------------------------------------------------- * PLLSAI1_Q | NA *----------------------------------------------------------------------------- * PLLSAI1_R | NA *----------------------------------------------------------------------------- * Require 48MHz for USB OTG FS, | Disabled * SDIO and RNG clock | *----------------------------------------------------------------------------- *============================================================================= ****************************************************************************** * @attention * * <h2><center>© Copyright (c) 2019 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 stm32WBxx_system * @{ */ /** @addtogroup stm32WBxx_System_Private_Includes * @{ */ #include "stm32wbxx.h" #if !defined (HSE_VALUE) #define HSE_VALUE (32000000UL) /*!< Value of the External oscillator in Hz */ #endif /* HSE_VALUE */ #if !defined (MSI_VALUE) #define MSI_VALUE (4000000UL) /*!< Value of the Internal oscillator in Hz*/ #endif /* MSI_VALUE */ #if !defined (HSI_VALUE) #define HSI_VALUE (16000000UL) /*!< Value of the Internal oscillator in Hz*/ #endif /* HSI_VALUE */ #if !defined (LSI_VALUE) #define LSI_VALUE (32000UL) /*!< Value of LSI in Hz*/ #endif /* LSI_VALUE */ #if !defined (LSE_VALUE) #define LSE_VALUE (32768UL) /*!< Value of LSE in Hz*/ #endif /* LSE_VALUE */ /** * @} */ /** @addtogroup STM32WBxx_System_Private_TypesDefinitions * @{ */ /** * @} */ /** @addtogroup STM32WBxx_System_Private_Defines * @{ */ /*!< Uncomment the following line if you need to relocate your vector Table in Internal SRAM. */ /* #define VECT_TAB_SRAM */ #define VECT_TAB_OFFSET OS_OFFSET /*!< Vector Table base offset field. This value must be a multiple of 0x200. */ #define VECT_TAB_BASE_ADDRESS SRAM1_BASE /*!< Vector Table base offset field. This value must be a multiple of 0x200. */ /** * @} */ /** @addtogroup STM32WBxx_System_Private_Macros * @{ */ /** * @} */ /** @addtogroup STM32WBxx_System_Private_Variables * @{ */ /* The SystemCoreClock 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 = 4000000UL ; /*CPU1: M4 on MSI clock after startup (4MHz)*/ const uint32_t AHBPrescTable[16UL] = {1UL, 3UL, 5UL, 1UL, 1UL, 6UL, 10UL, 32UL, 2UL, 4UL, 8UL, 16UL, 64UL, 128UL, 256UL, 512UL}; const uint32_t APBPrescTable[8UL] = {0UL, 0UL, 0UL, 0UL, 1UL, 2UL, 3UL, 4UL}; const uint32_t MSIRangeTable[16UL] = {100000UL, 200000UL, 400000UL, 800000UL, 1000000UL, 2000000UL, \ 4000000UL, 8000000UL, 16000000UL, 24000000UL, 32000000UL, 48000000UL, 0UL, 0UL, 0UL, 0UL}; /* 0UL values are incorrect cases */ #if defined(STM32WB55xx) || defined(STM32WB5Mxx) || defined(STM32WB35xx) const uint32_t SmpsPrescalerTable[4UL][6UL]={{1UL,3UL,2UL,2UL,1UL,2UL}, \ {2UL,6UL,4UL,3UL,2UL,4UL}, \ {4UL,12UL,8UL,6UL,4UL,8UL}, \ {4UL,12UL,8UL,6UL,4UL,8UL}}; #endif /** * @} */ /** @addtogroup STM32WBxx_System_Private_FunctionPrototypes * @{ */ /** * @} */ /** @addtogroup STM32WBxx_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(VECT_TAB_SRAM) && defined(VECT_TAB_BASE_ADDRESS) /* program in SRAMx */ SCB->VTOR = VECT_TAB_BASE_ADDRESS | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAMx for CPU1 */ #else /* program in FLASH */ SCB->VTOR = VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */ #endif /* FPU settings ------------------------------------------------------------*/ #if (__FPU_PRESENT == 1) && (__FPU_USED == 1) SCB->CPACR |= ((3UL << (10UL*2UL))|(3UL << (11UL*2UL))); /* set CP10 and CP11 Full Access */ #endif /* Reset the RCC clock configuration to the default reset state ------------*/ /* Set MSION bit */ RCC->CR |= RCC_CR_MSION; /* Reset CFGR register */ RCC->CFGR = 0x00070000U; /* Reset PLLSAI1ON, PLLON, HSECSSON, HSEON, HSION, and MSIPLLON bits */ RCC->CR &= (uint32_t)0xFAF6FEFBU; /*!< Reset LSI1 and LSI2 bits */ RCC->CSR &= (uint32_t)0xFFFFFFFAU; /*!< Reset HSI48ON bit */ RCC->CRRCR &= (uint32_t)0xFFFFFFFEU; /* Reset PLLCFGR register */ RCC->PLLCFGR = 0x22041000U; #if defined(STM32WB55xx) || defined(STM32WB5Mxx) /* Reset PLLSAI1CFGR register */ RCC->PLLSAI1CFGR = 0x22041000U; #endif /* Reset HSEBYP bit */ RCC->CR &= 0xFFFBFFFFU; /* Disable all interrupts */ RCC->CIER = 0x00000000; } /** * @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(*) * * - 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(*) or MSI_VALUE(*) multiplied/divided by the PLL factors. * * (*) MSI_VALUE is a constant defined in stm32wbxx_hal.h file (default value * 4 MHz) but the real value may vary depending on the variations * in voltage and temperature. * * (**) HSI_VALUE is a constant defined in stm32wbxx_hal_conf.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 stm32wbxx_hal_conf.h file (default value * 32 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, msirange, pllvco, pllr, pllsource , pllm; /* Get MSI Range frequency--------------------------------------------------*/ /*MSI frequency range in Hz*/ msirange = MSIRangeTable[(RCC->CR & RCC_CR_MSIRANGE) >> RCC_CR_MSIRANGE_Pos]; /* Get SYSCLK source -------------------------------------------------------*/ switch (RCC->CFGR & RCC_CFGR_SWS) { case 0x00: /* MSI used as system clock source */ SystemCoreClock = msirange; break; case 0x04: /* HSI used as system clock source */ /* HSI used as system clock source */ SystemCoreClock = HSI_VALUE; break; case 0x08: /* HSE used as system clock source */ SystemCoreClock = HSE_VALUE; break; case 0x0C: /* PLL used as system clock source */ /* PLL_VCO = (HSE_VALUE or HSI_VALUE or MSI_VALUE/ PLLM) * PLLN SYSCLK = PLL_VCO / PLLR */ pllsource = (RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC); pllm = ((RCC->PLLCFGR & RCC_PLLCFGR_PLLM) >> RCC_PLLCFGR_PLLM_Pos) + 1UL ; if(pllsource == 0x02UL) /* HSI used as PLL clock source */ { pllvco = (HSI_VALUE / pllm); } else if(pllsource == 0x03UL) /* HSE used as PLL clock source */ { pllvco = (HSE_VALUE / pllm); } else /* MSI used as PLL clock source */ { pllvco = (msirange / pllm); } pllvco = pllvco * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> RCC_PLLCFGR_PLLN_Pos); pllr = (((RCC->PLLCFGR & RCC_PLLCFGR_PLLR) >> RCC_PLLCFGR_PLLR_Pos) + 1UL); SystemCoreClock = pllvco/pllr; break; default: SystemCoreClock = msirange; break; } /* Compute HCLK clock frequency --------------------------------------------*/ /* Get HCLK1 prescaler */ tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> RCC_CFGR_HPRE_Pos)]; /* HCLK clock frequency */ SystemCoreClock = SystemCoreClock / tmp; } /** * @} */ /** * @} */ /** * @} */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/