/*******************************************************************************
 * Copyright (C) 2016, Huada Semiconductor Co., Ltd. All rights reserved.
 *
 * This software is owned and published by:
 * Huada Semiconductor Co., Ltd. ("HDSC").
 *
 * BY DOWNLOADING, INSTALLING OR USING THIS SOFTWARE, YOU AGREE TO BE BOUND
 * BY ALL THE TERMS AND CONDITIONS OF THIS AGREEMENT.
 *
 * This software contains source code for use with HDSC
 * components. This software is licensed by HDSC to be adapted only
 * for use in systems utilizing HDSC components. HDSC shall not be
 * responsible for misuse or illegal use of this software for devices not
 * supported herein. HDSC is providing this software "AS IS" and will
 * not be responsible for issues arising from incorrect user implementation
 * of the software.
 *
 * Disclaimer:
 * HDSC MAKES NO WARRANTY, EXPRESS OR IMPLIED, ARISING BY LAW OR OTHERWISE,
 * REGARDING THE SOFTWARE (INCLUDING ANY ACCOMPANYING WRITTEN MATERIALS),
 * ITS PERFORMANCE OR SUITABILITY FOR YOUR INTENDED USE, INCLUDING,
 * WITHOUT LIMITATION, THE IMPLIED WARRANTY OF MERCHANTABILITY, THE IMPLIED
 * WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR USE, AND THE IMPLIED
 * WARRANTY OF NONINFRINGEMENT.
 * HDSC SHALL HAVE NO LIABILITY (WHETHER IN CONTRACT, WARRANTY, TORT,
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/******************************************************************************/
/** \file system_hc32f46x.c
 **
 ** A detailed description is available at
 ** @link Hc32f46xSystemGroup Hc32f46xSystem description @endlink
 **
 **   - 2018-10-15  1.0  Zhangxl First version
 **
 ******************************************************************************/

/*******************************************************************************
 * Include files
 ******************************************************************************/
#include "hc32_common.h"

/**
 *******************************************************************************
 ** \addtogroup Hc32f46xSystemGroup
 ******************************************************************************/

/*******************************************************************************
 * Global pre-processor symbols/macros ('define')
 ******************************************************************************/

//@{

/**
 ******************************************************************************
 ** System Clock Frequency (Core Clock) Variable according CMSIS
 ******************************************************************************/
uint32_t HRC_VALUE = HRC_16MHz_VALUE;
uint32_t SystemCoreClock = MRC_VALUE;

/**
 ******************************************************************************
 ** \brief  Setup the microcontroller system. Initialize the System and update
 ** the SystemCoreClock variable.
 **
 ** \param  None
 ** \return None
 ******************************************************************************/
void SystemInit(void)
{
#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
    SCB->CPACR |= ((3UL << 20) | (3UL << 22)); /* set CP10 and CP11 Full Access */
#endif

    SystemCoreClockUpdate();
}

void SystemCoreClockUpdate(void)  // Update SystemCoreClock variable
{
    uint8_t tmp = 0u;
    uint32_t plln = 19u, pllp = 1u, pllm = 0u, pllsource = 0u;

    /* Select proper HRC_VALUE according to ICG1.HRCFREQSEL bit */
    /* ICG1.HRCFREQSEL = '0' represent HRC_VALUE = 20000000UL   */
    /* ICG1.HRCFREQSEL = '1' represent HRC_VALUE = 16000000UL   */
    if (1UL == (HRC_FREQ_MON() & 1UL))
    {
        HRC_VALUE = HRC_16MHz_VALUE;
    }
    else
    {
        HRC_VALUE = HRC_20MHz_VALUE;
    }

    tmp = M4_SYSREG->CMU_CKSWR_f.CKSW;
    switch (tmp)
    {
        case 0x00:  /* use internal high speed RC */
            SystemCoreClock = HRC_VALUE;
            break;
        case 0x01:  /* use internal middle speed RC */
            SystemCoreClock = MRC_VALUE;
            break;
        case 0x02:  /* use internal low speed RC */
            SystemCoreClock = LRC_VALUE;
            break;
        case 0x03:  /* use external high speed OSC */
            SystemCoreClock = XTAL_VALUE;
            break;
        case 0x04:  /* use external low speed OSC */
            SystemCoreClock = XTAL32_VALUE;
            break;
        case 0x05:  /* use MPLL */
            /* PLLCLK = ((pllsrc / pllm) * plln) / pllp */
            pllsource = M4_SYSREG->CMU_PLLCFGR_f.PLLSRC;
            plln = M4_SYSREG->CMU_PLLCFGR_f.MPLLN;
            pllp = M4_SYSREG->CMU_PLLCFGR_f.MPLLP;
            pllm = M4_SYSREG->CMU_PLLCFGR_f.MPLLM;
            /* use exteranl high speed OSC as PLL source */
            if (0ul == pllsource)
            {
                SystemCoreClock = (XTAL_VALUE) / (pllm + 1ul) * (plln + 1ul) / (pllp + 1ul);
            }
            /* use interanl high RC as PLL source */
            else if (1ul == pllsource)
            {
                SystemCoreClock = (HRC_VALUE) / (pllm + 1ul) * (plln + 1ul) / (pllp + 1ul);
            }
            else
            {
                /* Reserved */
            }
            break;
    }
}

//@} // UsartGroup

/*******************************************************************************
 * EOF (not truncated)
 ******************************************************************************/