/**
 ******************************************************************************
 * @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;
}

/**
 * @}
 */

/**
 * @}
 */

/**
 * @}
 */