/**
******************************************************************************
* @file system_stm32h7xx.c
* @author MCD Application Team
* @brief CMSIS Cortex-Mx 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_stm32h7xx.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) 2018 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 stm32h7xx_system
* @{
*/
/** @addtogroup STM32H7xx_System_Private_Includes
* @{
*/
#include "stm32h7xx.h"
#include <math.h>
#ifdef __rtems__
#include <bsp/linker-symbols.h>
#include <bspopts.h>
#define HSE_VALUE STM32H7_HSE_FREQUENCY
#endif /* __rtems__ */
#if !defined (HSE_VALUE)
#define HSE_VALUE ((uint32_t)24000000) /*!< Value of the External oscillator in Hz */
#endif /* HSE_VALUE */
#if !defined (CSI_VALUE)
#define CSI_VALUE ((uint32_t)4000000) /*!< Value of the Internal oscillator in Hz*/
#endif /* CSI_VALUE */
#if !defined (HSI_VALUE)
#define HSI_VALUE ((uint32_t)64000000) /*!< Value of the Internal oscillator in Hz*/
#endif /* HSI_VALUE */
/**
* @}
*/
/** @addtogroup STM32H7xx_System_Private_TypesDefinitions
* @{
*/
/**
* @}
*/
/** @addtogroup STM32H7xx_System_Private_Defines
* @{
*/
/************************* Miscellaneous Configuration ************************/
/*!< Uncomment the following line if you need to use initialized data in CD domain AHB SRAM */
/* #define DATA_IN_CD_AHB_SRAM */
/*!< Uncomment the following line if you need to relocate your vector Table in
Internal SRAM. */
/* #define VECT_TAB_SRAM */
#define VECT_TAB_OFFSET 0x00000000UL /*!< Vector Table base offset field.
This value must be a multiple of 0x200. */
/******************************************************************************/
/**
* @}
*/
/** @addtogroup STM32H7xx_System_Private_Macros
* @{
*/
/**
* @}
*/
/** @addtogroup STM32H7xx_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.
*/
#ifndef __rtems__
uint32_t SystemCoreClock = 64000000;
uint32_t SystemD2Clock = 64000000; /* AXI and AHBs Clock frequency */
#else /* __rtems__ */
RTEMS_SECTION(".rtemsstack") uint32_t SystemCoreClock;
RTEMS_SECTION(".rtemsstack") uint32_t SystemD2Clock;
#endif /* __rtems__ */
const uint8_t D1CorePrescTable[16] = {0, 0, 0, 0, 1, 2, 3, 4, 1, 2, 3, 4, 6, 7, 8, 9}; /* CPU Domain Core Prescaler Table */
/**
* @}
*/
/** @addtogroup STM32H7xx_System_Private_FunctionPrototypes
* @{
*/
/**
* @}
*/
/** @addtogroup STM32H7xx_System_Private_Functions
* @{
*/
/**
* @brief Setup the microcontroller system
* Initialize the FPU setting and vector table location
* configuration.
* @param None
* @retval None
*/
void SystemInit (void)
{
#ifdef DATA_IN_CD_AHB_SRAM
__IO uint32_t tmpreg;
#endif /* DATA_IN_CD_AHB_SRAM */
/* FPU settings ------------------------------------------------------------*/
#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
SCB->CPACR |= ((3UL << (10*2))|(3UL << (11*2))); /* set CP10 and CP11 Full Access */
#endif
/* Reset the RCC clock configuration to the default reset state ------------*/
/* Set HSION bit */
RCC->CR |= RCC_CR_HSION;
/* Reset CFGR register */
RCC->CFGR = 0x00000000;
/* Reset HSEON, CSSON , CSION,RC48ON, CSIKERON PLL1ON, PLL2ON and PLL3ON bits */
RCC->CR &= 0xEAF6ED7FU;
/* Reset CDCFGR1 register */
RCC->CDCFGR1 = 0x00000000;
/* Reset CDCFGR2 register */
RCC->CDCFGR2 = 0x00000000;
/* Reset SRDCFGR register */
RCC->SRDCFGR = 0x00000000;
/* Reset PLLCKSELR register */
RCC->PLLCKSELR = 0x02020200;
/* Reset PLLCFGR register */
RCC->PLLCFGR = 0x01FF0000;
/* Reset PLL1DIVR register */
RCC->PLL1DIVR = 0x01010280;
/* Reset PLL1FRACR register */
RCC->PLL1FRACR = 0x00000000;
/* Reset PLL2DIVR register */
RCC->PLL2DIVR = 0x01010280;
/* Reset PLL2FRACR register */
RCC->PLL2FRACR = 0x00000000;
/* Reset PLL3DIVR register */
RCC->PLL3DIVR = 0x01010280;
/* Reset PLL3FRACR register */
RCC->PLL3FRACR = 0x00000000;
/* Reset HSEBYP bit */
RCC->CR &= 0xFFFBFFFFU;
/* Disable all interrupts */
RCC->CIER = 0x00000000;
#ifdef DATA_IN_CD_AHB_SRAM
/* in case of initialized data in CD AHB SRAM, enable the CD AHB SRAM clock */
RCC->AHB2ENR |= (RCC_AHB2ENR_AHBSRAM1EN | RCC_AHB2ENR_AHBSRAM2EN);
#ifndef __rtems__
tmpreg = RCC->AHB2ENR;
(void) tmpreg;
#else /* __rtems__ */
RCC->AHB2ENR;
#endif /* __rtems__ */
#endif /* DATA_IN_CD_AHB_SRAM */
/*
* Disable the FMC bank1 (enabled after reset).
* This, prevents CPU speculation access on this bank which blocks the use of FMC during
* 24us. During this time the others FMC master (such as LTDC) cannot use it!
*/
FMC_Bank1_R->BTCR[0] = 0x000030D2;
#ifndef __rtems__
/* Configure the Vector Table location add offset address for cortex-M7 ------------------*/
#ifdef VECT_TAB_SRAM
SCB->VTOR = CD_AXISRAM1_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal CD AXI-RAM */
#else
SCB->VTOR = FLASH_BANK1_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */
#endif
#else /* __rtems__ */
SCB->VTOR = (uint32_t) bsp_start_vector_table_begin;
#endif /* __rtems__ */
}
/**
* @brief Update SystemCoreClock variable according to Clock Register Values.
* The SystemCoreClock variable contains the core clock , it can
* be used by the user application to setup the SysTick timer or configure
* other parameters.
*
* @note Each time the core clock 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 CSI, SystemCoreClock will contain the CSI_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 CSI_VALUE(*),
* HSI_VALUE(**) or HSE_VALUE(***) multiplied/divided by the PLL factors.
*
* (*) CSI_VALUE is a constant defined in stm32h7xx_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 stm32h7xx_hal.h file (default value
* 64 MHz) but the real value may vary depending on the variations
* in voltage and temperature.
*
* (***)HSE_VALUE is a constant defined in stm32h7xx_hal.h file (default value
* 25 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 pllp, pllsource, pllm, pllfracen, hsivalue, tmp;
float_t fracn1, pllvco;
/* Get SYSCLK source -------------------------------------------------------*/
switch (RCC->CFGR & RCC_CFGR_SWS)
{
case RCC_CFGR_SWS_HSI: /* HSI used as system clock source */
SystemCoreClock = (uint32_t) (HSI_VALUE >> ((RCC->CR & RCC_CR_HSIDIV)>> 3));
break;
case RCC_CFGR_SWS_CSI: /* CSI used as system clock source */
SystemCoreClock = CSI_VALUE;
break;
case RCC_CFGR_SWS_HSE: /* HSE used as system clock source */
SystemCoreClock = HSE_VALUE;
break;
case RCC_CFGR_SWS_PLL1: /* PLL1 used as system clock source */
/* PLL_VCO = (HSE_VALUE or HSI_VALUE or CSI_VALUE/ PLLM) * PLLN
SYSCLK = PLL_VCO / PLLR
*/
pllsource = (RCC->PLLCKSELR & RCC_PLLCKSELR_PLLSRC);
pllm = ((RCC->PLLCKSELR & RCC_PLLCKSELR_DIVM1)>> 4) ;
pllfracen = ((RCC->PLLCFGR & RCC_PLLCFGR_PLL1FRACEN)>>RCC_PLLCFGR_PLL1FRACEN_Pos);
fracn1 = (float_t)(uint32_t)(pllfracen* ((RCC->PLL1FRACR & RCC_PLL1FRACR_FRACN1)>> 3));
if (pllm != 0U)
{
switch (pllsource)
{
case RCC_PLLCKSELR_PLLSRC_HSI: /* HSI used as PLL clock source */
hsivalue = (HSI_VALUE >> ((RCC->CR & RCC_CR_HSIDIV)>> 3)) ;
pllvco = ( (float_t)hsivalue / (float_t)pllm) * ((float_t)(uint32_t)(RCC->PLL1DIVR & RCC_PLL1DIVR_N1) + (fracn1/(float_t)0x2000) +(float_t)1 );
break;
case RCC_PLLCKSELR_PLLSRC_CSI: /* CSI used as PLL clock source */
pllvco = ((float_t)CSI_VALUE / (float_t)pllm) * ((float_t)(uint32_t)(RCC->PLL1DIVR & RCC_PLL1DIVR_N1) + (fracn1/(float_t)0x2000) +(float_t)1 );
break;
case RCC_PLLCKSELR_PLLSRC_HSE: /* HSE used as PLL clock source */
pllvco = ((float_t)HSE_VALUE / (float_t)pllm) * ((float_t)(uint32_t)(RCC->PLL1DIVR & RCC_PLL1DIVR_N1) + (fracn1/(float_t)0x2000) +(float_t)1 );
break;
default:
pllvco = ((float_t)CSI_VALUE / (float_t)pllm) * ((float_t)(uint32_t)(RCC->PLL1DIVR & RCC_PLL1DIVR_N1) + (fracn1/(float_t)0x2000) +(float_t)1 );
break;
}
pllp = (((RCC->PLL1DIVR & RCC_PLL1DIVR_P1) >>9) + 1U ) ;
SystemCoreClock = (uint32_t)(float_t)(pllvco/(float_t)pllp);
}
else
{
SystemCoreClock = 0U;
}
break;
default:
SystemCoreClock = CSI_VALUE;
break;
}
/* Compute SystemClock frequency --------------------------------------------------*/
tmp = D1CorePrescTable[(RCC->CDCFGR1 & RCC_CDCFGR1_CDCPRE)>> RCC_CDCFGR1_CDCPRE_Pos];
/* SystemCoreClock frequency : CM7 CPU frequency */
SystemCoreClock >>= tmp;
/* SystemD2Clock frequency : AXI and AHBs Clock frequency */
SystemD2Clock = (SystemCoreClock >> ((D1CorePrescTable[(RCC->CDCFGR1 & RCC_CDCFGR1_HPRE)>> RCC_CDCFGR1_HPRE_Pos]) & 0x1FU));
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
