mirror of https://github.com/ARMmbed/mbed-os.git
325 lines
10 KiB
C
325 lines
10 KiB
C
/**
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******************************************************************************
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* @file system_stm32h7xx.c
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* @author MCD Application Team
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* @brief CMSIS Cortex-M7 Device Peripheral Access Layer System Source File.
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* This provides system initialization template function is case of
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* an application using a single core STM32H7 device
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*
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* This file provides two functions and one global variable to be called from
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* user application:
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* - SystemInit(): This function is called at startup just after reset and
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* before branch to main program. This call is made inside
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* the "startup_stm32h7xx.s" file.
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*
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* - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
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* by the user application to setup the SysTick
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* timer or configure other parameters.
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*
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* - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
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* be called whenever the core clock is changed
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* during program execution.
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*
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*
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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*/
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/** @addtogroup CMSIS
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* @{
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*/
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/** @addtogroup stm32h7xx_system
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* @{
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*/
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/** @addtogroup STM32H7xx_System_Private_Includes
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* @{
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*/
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#include "stm32h7xx.h"
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#include "nvic_addr.h" // MBED PATCH for Bootloader
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#if !defined (HSE_VALUE)
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#define HSE_VALUE ((uint32_t)25000000) /*!< Value of the External oscillator in Hz */
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#endif /* HSE_VALUE */
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#if !defined (CSI_VALUE)
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#define CSI_VALUE ((uint32_t)4000000) /*!< Value of the Internal oscillator in Hz*/
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#endif /* CSI_VALUE */
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#if !defined (HSI_VALUE)
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#define HSI_VALUE ((uint32_t)64000000) /*!< Value of the Internal oscillator in Hz*/
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#endif /* HSI_VALUE */
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/**
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* @}
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*/
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/** @addtogroup STM32H7xx_System_Private_TypesDefinitions
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* @{
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*/
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/**
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* @}
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*/
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/** @addtogroup STM32H7xx_System_Private_Defines
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* @{
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*/
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/************************* Miscellaneous Configuration ************************/
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/*!< Uncomment the following line if you need to relocate your vector Table in
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Internal SRAM. */
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/* #define VECT_TAB_SRAM */
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#define VECT_TAB_OFFSET 0x00 /*!< Vector Table base offset field.
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This value must be a multiple of 0x200. */
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/******************************************************************************/
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/**
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* @}
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*/
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/** @addtogroup STM32H7xx_System_Private_Macros
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* @{
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*/
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/**
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* @}
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*/
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/** @addtogroup STM32H7xx_System_Private_Variables
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* @{
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*/
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/* This variable is updated in three ways:
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1) by calling CMSIS function SystemCoreClockUpdate()
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2) by calling HAL API function HAL_RCC_GetHCLKFreq()
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3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
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Note: If you use this function to configure the system clock; then there
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is no need to call the 2 first functions listed above, since SystemCoreClock
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variable is updated automatically.
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*/
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uint32_t SystemCoreClock = 64000000;
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uint32_t SystemD2Clock = 64000000;
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const uint8_t D1CorePrescTable[16] = {0, 0, 0, 0, 1, 2, 3, 4, 1, 2, 3, 4, 6, 7, 8, 9};
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/**
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* @}
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*/
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/** @addtogroup STM32H7xx_System_Private_FunctionPrototypes
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* @{
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*/
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/**
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* @}
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*/
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/** @addtogroup STM32H7xx_System_Private_Functions
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* @{
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*/
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/**
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* @brief Setup the microcontroller system
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* Initialize the FPU setting and vector table location
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* configuration.
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* @param None
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* @retval None
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*/
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void SystemInit (void)
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{
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/* FPU settings ------------------------------------------------------------*/
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#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
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SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2)); /* set CP10 and CP11 Full Access */
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#endif
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/* Reset the RCC clock configuration to the default reset state ------------*/
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/* Set HSION bit */
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RCC->CR |= RCC_CR_HSION;
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/* Reset CFGR register */
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RCC->CFGR = 0x00000000;
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/* Reset HSEON, CSSON , CSION,RC48ON, CSIKERON PLL1ON, PLL2ON and PLL3ON bits */
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RCC->CR &= (uint32_t)0xEAF6ED7F;
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/* Reset D1CFGR register */
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RCC->D1CFGR = 0x00000000;
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/* Reset D2CFGR register */
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RCC->D2CFGR = 0x00000000;
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/* Reset D3CFGR register */
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RCC->D3CFGR = 0x00000000;
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/* Reset PLLCKSELR register */
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RCC->PLLCKSELR = 0x00000000;
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/* Reset PLLCFGR register */
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RCC->PLLCFGR = 0x00000000;
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/* Reset PLL1DIVR register */
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RCC->PLL1DIVR = 0x00000000;
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/* Reset PLL1FRACR register */
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RCC->PLL1FRACR = 0x00000000;
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/* Reset PLL2DIVR register */
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RCC->PLL2DIVR = 0x00000000;
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/* Reset PLL2FRACR register */
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RCC->PLL2FRACR = 0x00000000;
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/* Reset PLL3DIVR register */
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RCC->PLL3DIVR = 0x00000000;
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/* Reset PLL3FRACR register */
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RCC->PLL3FRACR = 0x00000000;
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/* Reset HSEBYP bit */
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RCC->CR &= (uint32_t)0xFFFBFFFF;
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/* Disable all interrupts */
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RCC->CIER = 0x00000000;
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/* Change the switch matrix read issuing capability to 1 for the AXI SRAM target (Target 7) */
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*((__IO uint32_t*)0x51008108) = 0x000000001;
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/* Configure the Vector Table location add offset address ------------------*/
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#ifdef VECT_TAB_SRAM
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SCB->VTOR = D1_AXISRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
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#else
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SCB->VTOR = NVIC_FLASH_VECTOR_ADDRESS; /* Vector Table Relocation in Internal FLASH */ // MBED PATCH for Bootloader
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#endif
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}
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/**
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* @brief Update SystemCoreClock variable according to Clock Register Values.
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* The SystemCoreClock variable contains the core clock , it can
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* be used by the user application to setup the SysTick timer or configure
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* other parameters.
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*
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* @note Each time the core clock changes, this function must be called
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* to update SystemCoreClock variable value. Otherwise, any configuration
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* based on this variable will be incorrect.
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*
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* @note - The system frequency computed by this function is not the real
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* frequency in the chip. It is calculated based on the predefined
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* constant and the selected clock source:
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*
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* - If SYSCLK source is CSI, SystemCoreClock will contain the CSI_VALUE(*)
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* - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(**)
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* - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(***)
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* - If SYSCLK source is PLL, SystemCoreClock will contain the CSI_VALUE(*),
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* HSI_VALUE(**) or HSE_VALUE(***) multiplied/divided by the PLL factors.
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*
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* (*) CSI_VALUE is a constant defined in stm32h7xx_hal.h file (default value
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* 4 MHz) but the real value may vary depending on the variations
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* in voltage and temperature.
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* (**) HSI_VALUE is a constant defined in stm32h7xx_hal.h file (default value
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* 64 MHz) but the real value may vary depending on the variations
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* in voltage and temperature.
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*
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* (***)HSE_VALUE is a constant defined in stm32h7xx_hal.h file (default value
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* 25 MHz), user has to ensure that HSE_VALUE is same as the real
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* frequency of the crystal used. Otherwise, this function may
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* have wrong result.
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*
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* - The result of this function could be not correct when using fractional
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* value for HSE crystal.
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* @param None
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* @retval None
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*/
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void SystemCoreClockUpdate (void)
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{
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uint32_t pllp = 2, pllsource = 0, pllm = 2 ,tmp, pllfracen =0 , hsivalue = 0;
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float fracn1, pllvco = 0 ;
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/* Get SYSCLK source -------------------------------------------------------*/
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switch (RCC->CFGR & RCC_CFGR_SWS)
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{
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case 0x00: /* HSI used as system clock source */
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SystemCoreClock = (uint32_t) (HSI_VALUE >> ((RCC->CR & RCC_CR_HSIDIV)>> 3));
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break;
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case 0x08: /* CSI used as system clock source */
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SystemCoreClock = CSI_VALUE;
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break;
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case 0x10: /* HSE used as system clock source */
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SystemCoreClock = HSE_VALUE;
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break;
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case 0x18: /* PLL1 used as system clock source */
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/* PLL_VCO = (HSE_VALUE or HSI_VALUE or CSI_VALUE/ PLLM) * PLLN
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SYSCLK = PLL_VCO / PLLR
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*/
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pllsource = (RCC->PLLCKSELR & RCC_PLLCKSELR_PLLSRC);
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pllm = ((RCC->PLLCKSELR & RCC_PLLCKSELR_DIVM1)>> 4) ;
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pllfracen = RCC->PLLCFGR & RCC_PLLCFGR_PLL1FRACEN;
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fracn1 = (pllfracen* ((RCC->PLL1FRACR & RCC_PLL1FRACR_FRACN1)>> 3));
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switch (pllsource)
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{
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case 0x00: /* HSI used as PLL clock source */
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hsivalue = (HSI_VALUE >> ((RCC->CR & RCC_CR_HSIDIV)>> 3)) ;
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pllvco = (hsivalue/ pllm) * ((RCC->PLL1DIVR & RCC_PLL1DIVR_N1) + (fracn1/0x2000) +1 );
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break;
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case 0x01: /* CSI used as PLL clock source */
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pllvco = (CSI_VALUE / pllm) * ((RCC->PLL1DIVR & RCC_PLL1DIVR_N1) + (fracn1/0x2000) +1 );
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break;
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case 0x02: /* HSE used as PLL clock source */
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pllvco = (HSE_VALUE / pllm) * ((RCC->PLL1DIVR & RCC_PLL1DIVR_N1) + (fracn1/0x2000) +1 );
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break;
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default:
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pllvco = (CSI_VALUE / pllm) * ((RCC->PLL1DIVR & RCC_PLL1DIVR_N1) + (fracn1/0x2000) +1 );
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break;
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}
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pllp = (((RCC->PLL1DIVR & RCC_PLL1DIVR_P1) >>9) + 1 ) ;
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SystemCoreClock = (uint32_t) (pllvco/pllp);
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break;
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default:
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SystemCoreClock = CSI_VALUE;
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break;
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}
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/* Compute HCLK frequency --------------------------------------------------*/
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/* Get HCLK prescaler */
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tmp = D1CorePrescTable[(RCC->D1CFGR & RCC_D1CFGR_D1CPRE)>> POSITION_VAL(RCC_D1CFGR_D1CPRE_0)];
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/* HCLK frequency */
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SystemCoreClock >>= tmp;
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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/**
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* @}
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*/
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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