| /** |
| ****************************************************************************** |
| * @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 0x0U /*!< 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****/ |
