flipperzero-firmware/firmware/targets/f7/Src/system_stm32wbxx.c

372 lines
13 KiB
C
Raw Normal View History

/**
******************************************************************************
* @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>&copy; 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****/