| /** |
| ****************************************************************************** |
| * @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 |
| * |
| * Copyright (c) 2019-2021 STMicroelectronics. |
| * All rights reserved. |
| * |
| * This software is licensed under terms that can be found in the LICENSE file |
| * in the root directory of this software component. |
| * If no LICENSE file comes with this software, it is provided AS-IS. |
| * |
| ****************************************************************************** |
| */ |
| |
| /** @addtogroup CMSIS |
| * @{ |
| */ |
| |
| /** @addtogroup stm32WBxx_system |
| * @{ |
| */ |
| |
| /** @addtogroup stm32WBxx_System_Private_Includes |
| * @{ |
| */ |
| |
| #include "app_common.h" |
| #include "otp.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 |
| * @{ |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /** @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) || defined(STM32WB15xx) |
| 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) |
| { |
| OTP_ID0_t * p_otp; |
| |
| /* FPU settings ------------------------------------------------------------*/ |
| #if (__FPU_PRESENT == 1) && (__FPU_USED == 1) |
| SCB->CPACR |= ((3UL << (10UL * 2UL)) | (3UL << (11UL * 2UL))); /* set CP10 and CP11 Full Access */ |
| #endif |
| |
| /** |
| * Read HSE_Tuning from OTP |
| */ |
| p_otp = (OTP_ID0_t *) OTP_Read(0); |
| if (p_otp) |
| { |
| LL_RCC_HSE_SetCapacitorTuning(p_otp->hse_tuning); |
| } |
| |
| LL_RCC_HSE_Enable(); |
| |
| /** |
| * Set FLASH latency to 1WS |
| */ |
| LL_FLASH_SetLatency(LL_FLASH_LATENCY_1); |
| while (LL_FLASH_GetLatency() != LL_FLASH_LATENCY_1) |
| ; |
| |
| /** |
| * Switch to HSE |
| * |
| */ |
| while (!LL_RCC_HSE_IsReady()) |
| ; |
| LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSE); |
| while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSE) |
| ; |
| |
| /** |
| * Switch OFF MSI |
| */ |
| LL_RCC_MSI_Disable(); |
| } |
| |
| /** |
| * @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]; |
| |
| /*SystemCoreClock=HAL_RCC_GetSysClockFreq();*/ |
| /* 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; |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
