/*
** ###################################################################
**     Processors:          LPC55S28JBD100
**                          LPC55S28JBD64
**                          LPC55S28JEV59
**                          LPC55S28JEV98
**
**     Compilers:           GNU C Compiler
**                          IAR ANSI C/C++ Compiler for ARM
**                          Keil ARM C/C++ Compiler
**                          MCUXpresso Compiler
**
**     Reference manual:    LPC55S6x/LPC55S2x/LPC552x User manual(UM11126) Rev.1.3  16 May 2019
**     Version:             rev. 1.1, 2019-05-16
**     Build:               b231019
**
**     Abstract:
**         Provides a system configuration function and a global variable that
**         contains the system frequency. It configures the device and initializes
**         the oscillator (PLL) that is part of the microcontroller device.
**
**     Copyright 2016 Freescale Semiconductor, Inc.
**     Copyright 2016-2023 NXP
**     SPDX-License-Identifier: BSD-3-Clause
**
**     http:                 www.nxp.com
**     mail:                 support@nxp.com
**
**     Revisions:
**     - rev. 1.0 (2018-08-22)
**         Initial version based on v0.2UM
**     - rev. 1.1 (2019-05-16)
**         Initial A1 version based on v1.3UM
**
** ###################################################################
*/

/*!
 * @file LPC55S28
 * @version 1.1
 * @date 2019-05-16
 * @brief Device specific configuration file for LPC55S28 (implementation file)
 *
 * Provides a system configuration function and a global variable that contains
 * the system frequency. It configures the device and initializes the oscillator
 * (PLL) that is part of the microcontroller device.
 */

#include <stdint.h>
#include "fsl_device_registers.h"

/* PLL0 SSCG control1 */
#define PLL_SSCG_MD_FRACT_P 0U
#define PLL_SSCG_MD_INT_P 25U
#define PLL_SSCG_MD_FRACT_M (0x1FFFFFFUL << PLL_SSCG_MD_FRACT_P)
#define PLL_SSCG_MD_INT_M ((uint64_t)0xFFUL << PLL_SSCG_MD_INT_P)

/* Get predivider (N) from PLL0 NDEC setting */
static uint32_t findPll0PreDiv(void)
{
    uint32_t preDiv = 1UL;

    /* Direct input is not used? */
    if ((SYSCON->PLL0CTRL & SYSCON_PLL0CTRL_BYPASSPREDIV_MASK) == 0UL)
    {
        preDiv = SYSCON->PLL0NDEC & SYSCON_PLL0NDEC_NDIV_MASK;
        if (preDiv == 0UL)
        {
            preDiv = 1UL;
        }
    }
    return preDiv;
}

/* Get postdivider (P) from PLL0 PDEC setting */
static uint32_t findPll0PostDiv(void)
{
    uint32_t postDiv = 1;

    if ((SYSCON->PLL0CTRL & SYSCON_PLL0CTRL_BYPASSPOSTDIV_MASK) == 0UL)
    {
        if ((SYSCON->PLL0CTRL & SYSCON_PLL0CTRL_BYPASSPOSTDIV2_MASK) != 0UL)
        {
            postDiv = SYSCON->PLL0PDEC & SYSCON_PLL0PDEC_PDIV_MASK;
        }
        else
        {
            postDiv = 2UL * (SYSCON->PLL0PDEC & SYSCON_PLL0PDEC_PDIV_MASK);
        }
        if (postDiv == 0UL)
        {
            postDiv = 2UL;
        }
    }
    return postDiv;
}

/* Get multiplier (M) from PLL0 SSCG and SEL_EXT settings */
static float findPll0MMult(void)
{
    float mMult = 1.0F;
    float mMult_fract;
    uint32_t mMult_int;

    if ((SYSCON->PLL0SSCG1 & SYSCON_PLL0SSCG1_SEL_EXT_MASK) != 0UL)
    {
        mMult = (float)(uint32_t)((SYSCON->PLL0SSCG1 & SYSCON_PLL0SSCG1_MDIV_EXT_MASK) >> SYSCON_PLL0SSCG1_MDIV_EXT_SHIFT);
    }
    else
    {
        mMult_int   = ((SYSCON->PLL0SSCG1 & SYSCON_PLL0SSCG1_MD_MBS_MASK) << 7U);
        mMult_int   = mMult_int | ((SYSCON->PLL0SSCG0) >> PLL_SSCG_MD_INT_P);
        mMult_fract = ((float)(uint32_t)((SYSCON->PLL0SSCG0) & PLL_SSCG_MD_FRACT_M) /
                       (float)(uint32_t)(1UL << PLL_SSCG_MD_INT_P));
        mMult       = (float)mMult_int + mMult_fract;
    }
    if (0ULL == ((uint64_t)mMult))
    {
        mMult = 1.0F;
    }
    return mMult;
}

/* Get predivider (N) from PLL1 NDEC setting */
static uint32_t findPll1PreDiv(void)
{
    uint32_t preDiv = 1UL;

    /* Direct input is not used? */
    if ((SYSCON->PLL1CTRL & SYSCON_PLL1CTRL_BYPASSPREDIV_MASK) == 0UL)
    {
        preDiv = SYSCON->PLL1NDEC & SYSCON_PLL1NDEC_NDIV_MASK;
        if (preDiv == 0UL)
        {
            preDiv = 1UL;
        }
    }
    return preDiv;
}

/* Get postdivider (P) from PLL1 PDEC setting */
static uint32_t findPll1PostDiv(void)
{
    uint32_t postDiv = 1UL;

    if ((SYSCON->PLL1CTRL & SYSCON_PLL1CTRL_BYPASSPOSTDIV_MASK) == 0UL)
    {
        if ((SYSCON->PLL1CTRL & SYSCON_PLL1CTRL_BYPASSPOSTDIV2_MASK) != 0UL)
        {
            postDiv = SYSCON->PLL1PDEC & SYSCON_PLL1PDEC_PDIV_MASK;
        }
        else
        {
            postDiv = 2UL * (SYSCON->PLL1PDEC & SYSCON_PLL1PDEC_PDIV_MASK);
        }
        if (postDiv == 0UL)
        {
            postDiv = 2UL;
        }
    }
    return postDiv;
}

/* Get multiplier (M) from PLL1 MDEC settings */
static uint32_t findPll1MMult(void)
{
    uint32_t mMult = 1UL;

    mMult = SYSCON->PLL1MDEC & SYSCON_PLL1MDEC_MDIV_MASK;

    if (mMult == 0UL)
    {
        mMult = 1UL;
    }
    return mMult;
}

/* Get FRO 12M Clk */
/*! brief  Return Frequency of FRO 12MHz
 *  return Frequency of FRO 12MHz
 */
static uint32_t GetFro12MFreq(void)
{
    return ((ANACTRL->FRO192M_CTRL & ANACTRL_FRO192M_CTRL_ENA_12MHZCLK_MASK) != 0UL) ? 12000000U : 0U;
}

/* Get FRO 1M Clk */
/*! brief  Return Frequency of FRO 1MHz
 *  return Frequency of FRO 1MHz
 */
static uint32_t GetFro1MFreq(void)
{
    return ((SYSCON->CLOCK_CTRL & SYSCON_CLOCK_CTRL_FRO1MHZ_CLK_ENA_MASK) != 0UL) ? 1000000U : 0U;
}

/* Get EXT OSC Clk */
/*! brief  Return Frequency of External Clock
 *  return Frequency of External Clock. If no external clock is used returns 0.
 */
static uint32_t GetExtClkFreq(void)
{
    return ((ANACTRL->XO32M_CTRL & ANACTRL_XO32M_CTRL_ENABLE_SYSTEM_CLK_OUT_MASK) != 0UL) ? CLK_CLK_IN : 0U;
}

/* Get HF FRO Clk */
/*! brief  Return Frequency of High-Freq output of FRO
 *  return Frequency of High-Freq output of FRO
 */
static uint32_t GetFroHfFreq(void)
{
    return ((ANACTRL->FRO192M_CTRL & ANACTRL_FRO192M_CTRL_ENA_96MHZCLK_MASK) != 0UL) ? 96000000U : 0U;
}

/* Get RTC OSC Clk */
/*! brief  Return Frequency of 32kHz osc
 *  return Frequency of 32kHz osc
 */
static uint32_t GetOsc32KFreq(void)
{
    return ((0UL == (PMC->PDRUNCFG0 & PMC_PDRUNCFG0_PDEN_FRO32K_MASK)) && (0UL == (PMC->RTCOSC32K & PMC_RTCOSC32K_SEL_MASK))) ?
               CLK_RTC_32K_CLK :
               ((0UL == (PMC->PDRUNCFG0 & PMC_PDRUNCFG0_PDEN_XTAL32K_MASK)) && ((PMC->RTCOSC32K & PMC_RTCOSC32K_SEL_MASK) != 0UL)) ?
               CLK_RTC_32K_CLK :
               0U;
}



/* ----------------------------------------------------------------------------
   -- Core clock
   ---------------------------------------------------------------------------- */

uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;

/* ----------------------------------------------------------------------------
   -- SystemInit()
   ---------------------------------------------------------------------------- */

__attribute__ ((weak)) void SystemInit (void) {
#if ((__FPU_PRESENT == 1) && (__FPU_USED == 1))
  SCB->CPACR |= ((3UL << 10*2) | (3UL << 11*2));    /* set CP10, CP11 Full Access in Secure mode */
  #if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
  SCB_NS->CPACR |= ((3UL << 10*2) | (3UL << 11*2));    /* set CP10, CP11 Full Access in Non-secure mode */
  #endif /* (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) */
#endif /* ((__FPU_PRESENT == 1) && (__FPU_USED == 1)) */

  SCB->CPACR |= ((3UL << 0*2) | (3UL << 1*2));    /* set CP0, CP1 Full Access in Secure mode (enable PowerQuad) */
#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
  SCB_NS->CPACR |= ((3UL << 0*2) | (3UL << 1*2));    /* set CP0, CP1 Full Access in Normal mode (enable PowerQuad) */
#endif /* (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) */

  SCB->NSACR |= ((3UL << 0) | (3UL << 10));   /* enable CP0, CP1, CP10, CP11 Non-secure Access */

#if defined(__MCUXPRESSO)
    extern void(*const g_pfnVectors[]) (void);
    SCB->VTOR = (uint32_t) &g_pfnVectors;
#else
    extern void *__Vectors;
    SCB->VTOR = (uint32_t) &__Vectors;
#endif
    SYSCON->TRACECLKDIV = 0;
/* Optionally enable RAM banks that may be off by default at reset */
#if !defined(DONT_ENABLE_DISABLED_RAMBANKS)
    SYSCON->AHBCLKCTRLSET[0] = SYSCON_AHBCLKCTRL0_SRAM_CTRL1_MASK | SYSCON_AHBCLKCTRL0_SRAM_CTRL2_MASK
                          | SYSCON_AHBCLKCTRL0_SRAM_CTRL3_MASK | SYSCON_AHBCLKCTRL0_SRAM_CTRL4_MASK;
#endif
  SystemInitHook();
}

/* ----------------------------------------------------------------------------
   -- SystemCoreClockUpdate()
   ---------------------------------------------------------------------------- */

void SystemCoreClockUpdate (void) {
    uint32_t clkRate = 0;
    uint32_t prediv, postdiv;
    uint64_t workRate;
    uint64_t workRate1;

    switch (SYSCON->MAINCLKSELB & SYSCON_MAINCLKSELB_SEL_MASK)
    {
        case 0x00: /* MAINCLKSELA clock (main_clk_a)*/
            switch (SYSCON->MAINCLKSELA & SYSCON_MAINCLKSELA_SEL_MASK)
            {
                case 0x00: /* FRO 12 MHz (fro_12m) */
                    clkRate = GetFro12MFreq();
                    break;
                case 0x01: /* CLKIN (clk_in) */
                    clkRate = GetExtClkFreq();
                    break;
                case 0x02: /* Fro 1MHz (fro_1m) */
                    clkRate = GetFro1MFreq();
                    break;
                default: /* = 0x03 = FRO 96 MHz (fro_hf) */
                    clkRate = GetFroHfFreq();
                    break;
            }
            break;
        case 0x01: /* PLL0 clock (pll0_clk)*/
            switch (SYSCON->PLL0CLKSEL & SYSCON_PLL0CLKSEL_SEL_MASK)
            {
                case 0x00: /* FRO 12 MHz (fro_12m) */
                    clkRate = GetFro12MFreq();
                    break;
                case 0x01: /* CLKIN (clk_in) */
                    clkRate = GetExtClkFreq();
                    break;
                case 0x02: /* Fro 1MHz (fro_1m) */
                    clkRate = GetFro1MFreq();
                    break;
                case 0x03: /* RTC oscillator 32 kHz output (32k_clk) */
                    clkRate = GetOsc32KFreq();
                    break;
                default:
                    clkRate = 0UL;
                    break;
            }
            if (((SYSCON->PLL0CTRL & SYSCON_PLL0CTRL_BYPASSPLL_MASK) == 0UL) && ((SYSCON->PLL0CTRL & SYSCON_PLL0CTRL_CLKEN_MASK) != 0UL) && ((PMC->PDRUNCFG0 & PMC_PDRUNCFG0_PDEN_PLL0_MASK) == 0UL) && ((PMC->PDRUNCFG0 & PMC_PDRUNCFG0_PDEN_PLL0_SSCG_MASK) == 0UL))
            {
                prediv = findPll0PreDiv();
                postdiv = findPll0PostDiv();
                /* Adjust input clock */
                clkRate = clkRate / prediv;
                /* MDEC used for rate */
                workRate = (uint64_t)clkRate * (uint64_t)findPll0MMult();
                clkRate = (uint32_t)(workRate / ((uint64_t)postdiv));
            }
            break;
        case 0x02: /* PLL1 clock (pll1_clk)*/
            switch (SYSCON->PLL1CLKSEL & SYSCON_PLL1CLKSEL_SEL_MASK)
            {
                case 0x00: /* FRO 12 MHz (fro_12m) */
                    clkRate = GetFro12MFreq();
                    break;
                case 0x01: /* CLKIN (clk_in) */
                    clkRate = GetExtClkFreq();
                    break;
                case 0x02: /* Fro 1MHz (fro_1m) */
                    clkRate = GetFro1MFreq();
                    break;
                case 0x03: /* RTC oscillator 32 kHz output (32k_clk) */
                    clkRate = GetOsc32KFreq();
                    break;
                default:
                    clkRate = 0UL;
                    break;
            }
            if (((SYSCON->PLL1CTRL & SYSCON_PLL1CTRL_BYPASSPLL_MASK) == 0UL) && ((SYSCON->PLL1CTRL & SYSCON_PLL1CTRL_CLKEN_MASK) != 0UL) && ((PMC->PDRUNCFG0 & PMC_PDRUNCFG0_PDEN_PLL1_MASK) == 0UL))
            {
                /* PLL is not in bypass mode, get pre-divider, post-divider, and M divider */
                prediv = findPll1PreDiv();
                postdiv = findPll1PostDiv();
                /* Adjust input clock */
                clkRate = clkRate / prediv;

                /* MDEC used for rate */
                workRate1 = (uint64_t)clkRate * (uint64_t)findPll1MMult();
                clkRate = (uint32_t)(workRate1 / ((uint64_t)postdiv));
            }
            break;
        case 0x03: /* RTC oscillator 32 kHz output (32k_clk) */
            clkRate = GetOsc32KFreq();
            break;
        default:
            clkRate = 0UL;
            break;
    }
    SystemCoreClock = clkRate / ((SYSCON->AHBCLKDIV & 0xFFUL) + 1UL);
}

/* ----------------------------------------------------------------------------
   -- SystemInitHook()
   ---------------------------------------------------------------------------- */

__attribute__ ((weak)) void SystemInitHook (void) {
  /* Void implementation of the weak function. */
}
