/*
** ###################################################################
**     Processors:          MK64FN1M0CAJ12
**                          MK64FN1M0VDC12
**                          MK64FN1M0VLL12
**                          MK64FN1M0VLQ12
**                          MK64FN1M0VMD12
**                          MK64FX512VDC12
**                          MK64FX512VLL12
**                          MK64FX512VLQ12
**                          MK64FX512VMD12
**
**     Compilers:           Keil ARM C/C++ Compiler
**                          Freescale C/C++ for Embedded ARM
**                          GNU C Compiler
**                          IAR ANSI C/C++ Compiler for ARM
**                          MCUXpresso Compiler
**
**     Reference manual:    K64P144M120SF5RM, Rev.2, January 2014
**     Version:             rev. 2.9, 2016-03-21
**     Build:               b180801
**
**     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 2016-2018 NXP
**
**     SPDX-License-Identifier: BSD-3-Clause
**
**     http:                 www.nxp.com
**     mail:                 support@nxp.com
**
**     Revisions:
**     - rev. 1.0 (2013-08-12)
**         Initial version.
**     - rev. 2.0 (2013-10-29)
**         Register accessor macros added to the memory map.
**         Symbols for Processor Expert memory map compatibility added to the memory map.
**         Startup file for gcc has been updated according to CMSIS 3.2.
**         System initialization updated.
**         MCG - registers updated.
**         PORTA, PORTB, PORTC, PORTE - registers for digital filter removed.
**     - rev. 2.1 (2013-10-30)
**         Definition of BITBAND macros updated to support peripherals with 32-bit acces disabled.
**     - rev. 2.2 (2013-12-09)
**         DMA - EARS register removed.
**         AIPS0, AIPS1 - MPRA register updated.
**     - rev. 2.3 (2014-01-24)
**         Update according to reference manual rev. 2
**         ENET, MCG, MCM, SIM, USB - registers updated
**     - rev. 2.4 (2014-02-10)
**         The declaration of clock configurations has been moved to separate header file system_MK64F12.h
**         Update of SystemInit() and SystemCoreClockUpdate() functions.
**     - rev. 2.5 (2014-02-10)
**         The declaration of clock configurations has been moved to separate header file system_MK64F12.h
**         Update of SystemInit() and SystemCoreClockUpdate() functions.
**         Module access macro module_BASES replaced by module_BASE_PTRS.
**     - rev. 2.6 (2014-08-28)
**         Update of system files - default clock configuration changed.
**         Update of startup files - possibility to override DefaultISR added.
**     - rev. 2.7 (2014-10-14)
**         Interrupt INT_LPTimer renamed to INT_LPTMR0, interrupt INT_Watchdog renamed to INT_WDOG_EWM.
**     - rev. 2.8 (2015-02-19)
**         Renamed interrupt vector LLW to LLWU.
**     - rev. 2.9 (2016-03-21)
**         Added MK64FN1M0CAJ12 part.
**         GPIO - renamed port instances: PTx -> GPIOx.
**
** ###################################################################
*/

/*!
 * @file MK64F12
 * @version 2.9
 * @date 2016-03-21
 * @brief Device specific configuration file for MK64F12 (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"
#include "MK64F12.h"


/*----------------------------------------------------------------------------
  Define clock source values
 *----------------------------------------------------------------------------*/
#define CLOCK_SETUP 1

#if (CLOCK_SETUP == 1)
    #define CPU_XTAL0_CLK_HZ                SYS_FREQ_OSC
    #define CPU_XTAL32k_CLK_HZ              32768u    /* Value of the external 32k crystal or oscillator clock frequency in Hz */
    #define CPU_INT_SLOW_CLK_HZ             32768u    /* Value of the slow internal oscillator clock frequency in Hz  */
    #define CPU_INT_FAST_CLK_HZ             4000000u  /* Value of the fast internal oscillator clock frequency in Hz  */

	#undef DEFAULT_SYSTEM_CLOCK
    #define DEFAULT_SYSTEM_CLOCK            120000000u /* Default System clock value */
#endif //CLOCK_SETUP == 1

uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;


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

void SystemInit (void) {
#if ((__FPU_PRESENT == 1) && (__FPU_USED == 1))
  SCB->CPACR |= ((3UL << 10*2) | (3UL << 11*2));    /* set CP10, CP11 Full Access */
#endif /* ((__FPU_PRESENT == 1) && (__FPU_USED == 1)) */
#if (DISABLE_WDOG)
  /* WDOG->UNLOCK: WDOGUNLOCK=0xC520 */
  WDOG->UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xC520); /* Key 1 */
  /* WDOG->UNLOCK: WDOGUNLOCK=0xD928 */
  WDOG->UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xD928); /* Key 2 */
  /* WDOG->STCTRLH: ?=0,DISTESTWDOG=0,BYTESEL=0,TESTSEL=0,TESTWDOG=0,?=0,?=1,WAITEN=1,STOPEN=1,DBGEN=0,ALLOWUPDATE=1,WINEN=0,IRQRSTEN=0,CLKSRC=1,WDOGEN=0 */
  WDOG->STCTRLH = WDOG_STCTRLH_BYTESEL(0x00) |
                 WDOG_STCTRLH_WAITEN_MASK |
                 WDOG_STCTRLH_STOPEN_MASK |
                 WDOG_STCTRLH_ALLOWUPDATE_MASK |
                 WDOG_STCTRLH_CLKSRC_MASK |
                 0x0100U;
#endif /* (DISABLE_WDOG) */

  SystemInitHook();

  /* System clock initialization */
#if (CLOCK_SETUP == 1)
  /* SIM_SCGC5: PORTA=1 */
  SIM->SCGC5 |= (uint32_t)0x0200UL;     /* Enable clock gate for ports to enable pin routing */
  /* SIM_CLKDIV1: OUTDIV1=0,OUTDIV2=1,OUTDIV3=3,OUTDIV4=5,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */
  SIM->CLKDIV1 = (uint32_t)0x01350000UL; /* Update system prescalers */
  /* SIM_SOPT2: PLLFLLSEL=1 */
  SIM->SOPT2 = (uint32_t)((SIM->SOPT2 & (uint32_t)~0x00020000UL) | (uint32_t)0x00010000UL); /* Select PLL 0 as a clock source for various peripherals */
  /* SIM_SOPT1: OSC32KSEL=0 */
  SIM->SOPT1 &= (uint32_t)~0x00080000UL; /* System oscillator drives 32 kHz clock for various peripherals */
  /* SIM_SCGC1: OSC1=1 */
  SIM->SCGC1 |= (uint32_t)0x20UL;
  /* PORTA_PCR18: ISF=0,MUX=0 */
  PORTA->PCR[18] &= (uint32_t)~0x01000700UL;
  /* Switch to FBE Mode */
  /* OSC0_CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
  OSC->CR = (uint8_t)0x80U;
  /* OSC1_CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
  //OSC1->CR = (uint8_t)0x80U;
  /* MCG_C7: OSCSEL=0 */
  MCG->C7 &= (uint8_t)~(uint8_t)0x01U;
  /* MCG_C2: LOCRE0=0,??=0,RANGE0=1,HGO0=0,EREFS0=1,LP=0,IRCS=0 */
  MCG->C2 = (uint8_t)0x14U;
  /* MCG_C1: CLKS=2,FRDIV=4,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
  MCG->C1 = (uint8_t)0xA2U;
  /* MCG_C4: DMX32=0,DRST_DRS=0 */
  MCG->C4 &= (uint8_t)~(uint8_t)0xE0U;
  /* MCG_C5: PLLREFSEL0=0,PLLCLKEN0=0,PLLSTEN0=0,??=0,??=0,PRDIV0=3 */
  MCG->C5 = (uint8_t)0x03U;
  /* MCG_C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=6 */
  MCG->C6 = (uint8_t)0x06U;
  /* MCG_C11: PLLREFSEL1=0,PLLCLKEN1=0,PLLSTEN1=0,PLLCS=0,??=0,PRDIV1=0 */
  //MCG->C11 = (uint8_t)0x00U;
  /* MCG_C12: LOLIE1=0,??=0,CME2=0,VDIV1=0 */
  //MCG->C12 = (uint8_t)0x00U;
  while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
  }
  while((MCG->S & 0x0CU) != 0x08U) {    /* Wait until external reference clock is selected as MCG output */
  }
  /* Switch to PBE Mode */
  /* MCG_C6: LOLIE0=0,PLLS=1,CME0=0,VDIV0=6 */
  MCG->C6 = (uint8_t)0x46U;
  while((MCG->S & 0x0CU) != 0x08U) {    /* Wait until external reference clock is selected as MCG output */
  }
  while((MCG->S & MCG_S_LOCK0_MASK) == 0x00U) { /* Wait until PLL locked */
  }
  /* Switch to PEE Mode */
  /* MCG->C1: CLKS=0,FRDIV=5,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
  MCG->C1 = (uint8_t)0x2AU;
  while((MCG->S & 0x0CU) != 0x0CU) {}    /* Wait until output of the PLL is selected */
#endif
}

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

void SystemCoreClockUpdate (void) {
  uint32_t MCGOUTClock;                /* Variable to store output clock frequency of the MCG module */
  uint16_t Divider;

  if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x00U) {
    /* Output of FLL or PLL is selected */
    if ((MCG->C6 & MCG_C6_PLLS_MASK) == 0x00U) {
      /* FLL is selected */
      if ((MCG->C1 & MCG_C1_IREFS_MASK) == 0x00U) {
        /* External reference clock is selected */
        switch (MCG->C7 & MCG_C7_OSCSEL_MASK) {
        case 0x00U:
          MCGOUTClock = CPU_XTAL_CLK_HZ; /* System oscillator drives MCG clock */
          break;
        case 0x01U:
          MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */
          break;
        case 0x02U:
        default:
          MCGOUTClock = CPU_INT_IRC_CLK_HZ; /* IRC 48MHz oscillator drives MCG clock */
          break;
        }
        if (((MCG->C2 & MCG_C2_RANGE_MASK) != 0x00U) && ((MCG->C7 & MCG_C7_OSCSEL_MASK) != 0x01U)) {
          switch (MCG->C1 & MCG_C1_FRDIV_MASK) {
          case 0x38U:
            Divider = 1536U;
            break;
          case 0x30U:
            Divider = 1280U;
            break;
          default:
            Divider = (uint16_t)(32LU << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT));
            break;
          }
        } else {/* ((MCG->C2 & MCG_C2_RANGE_MASK) != 0x00U) */
          Divider = (uint16_t)(1LU << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT));
        }
        MCGOUTClock = (MCGOUTClock / Divider); /* Calculate the divided FLL reference clock */
      } else { /* (!((MCG->C1 & MCG_C1_IREFS_MASK) == 0x00U)) */
        MCGOUTClock = CPU_INT_SLOW_CLK_HZ; /* The slow internal reference clock is selected */
      } /* (!((MCG->C1 & MCG_C1_IREFS_MASK) == 0x00U)) */
      /* Select correct multiplier to calculate the MCG output clock  */
      switch (MCG->C4 & (MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS_MASK)) {
        case 0x00U:
          MCGOUTClock *= 640U;
          break;
        case 0x20U:
          MCGOUTClock *= 1280U;
          break;
        case 0x40U:
          MCGOUTClock *= 1920U;
          break;
        case 0x60U:
          MCGOUTClock *= 2560U;
          break;
        case 0x80U:
          MCGOUTClock *= 732U;
          break;
        case 0xA0U:
          MCGOUTClock *= 1464U;
          break;
        case 0xC0U:
          MCGOUTClock *= 2197U;
          break;
        case 0xE0U:
          MCGOUTClock *= 2929U;
          break;
        default:
          break;
      }
    } else { /* (!((MCG->C6 & MCG_C6_PLLS_MASK) == 0x00U)) */
      /* PLL is selected */
      Divider = (((uint16_t)MCG->C5 & MCG_C5_PRDIV0_MASK) + 0x01U);
      MCGOUTClock = (uint32_t)(CPU_XTAL_CLK_HZ / Divider); /* Calculate the PLL reference clock */
      Divider = (((uint16_t)MCG->C6 & MCG_C6_VDIV0_MASK) + 24U);
      MCGOUTClock *= Divider;          /* Calculate the MCG output clock */
    } /* (!((MCG->C6 & MCG_C6_PLLS_MASK) == 0x00U)) */
  } else if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x40U) {
    /* Internal reference clock is selected */
    if ((MCG->C2 & MCG_C2_IRCS_MASK) == 0x00U) {
      MCGOUTClock = CPU_INT_SLOW_CLK_HZ; /* Slow internal reference clock selected */
    } else { /* (!((MCG->C2 & MCG_C2_IRCS_MASK) == 0x00U)) */
      Divider = (uint16_t)(0x01LU << ((MCG->SC & MCG_SC_FCRDIV_MASK) >> MCG_SC_FCRDIV_SHIFT));
      MCGOUTClock = (uint32_t) (CPU_INT_FAST_CLK_HZ / Divider); /* Fast internal reference clock selected */
    } /* (!((MCG->C2 & MCG_C2_IRCS_MASK) == 0x00U)) */
  } else if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80U) {
    /* External reference clock is selected */
    switch (MCG->C7 & MCG_C7_OSCSEL_MASK) {
    case 0x00U:
      MCGOUTClock = CPU_XTAL_CLK_HZ;   /* System oscillator drives MCG clock */
      break;
    case 0x01U:
      MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */
      break;
    case 0x02U:
    default:
      MCGOUTClock = CPU_INT_IRC_CLK_HZ; /* IRC 48MHz oscillator drives MCG clock */
      break;
    }
  } else { /* (!((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80U)) */
    /* Reserved value */
    return;
  } /* (!((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80U)) */
  SystemCoreClock = (MCGOUTClock / (0x01U + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT)));
}

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

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