/*
** ###################################################################
**     Processors:          MKE15Z128VLH7
**                          MKE15Z128VLL7
**                          MKE15Z256VLH7
**                          MKE15Z256VLL7
**
**     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:    KE1xZP100M72SF0RM, Rev. 2, Aug. 2016
**     Version:             rev. 6.0, 2016-09-20
**     Build:               b170112
**
**     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 (c) 2016 Freescale Semiconductor, Inc.
**     Copyright 2016 - 2017 NXP
**     Redistribution and use in source and binary forms, with or without modification,
**     are permitted provided that the following conditions are met:
**
**     o Redistributions of source code must retain the above copyright notice, this list
**       of conditions and the following disclaimer.
**
**     o Redistributions in binary form must reproduce the above copyright notice, this
**       list of conditions and the following disclaimer in the documentation and/or
**       other materials provided with the distribution.
**
**     o Neither the name of the copyright holder nor the names of its
**       contributors may be used to endorse or promote products derived from this
**       software without specific prior written permission.
**
**     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
**     ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
**     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
**     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
**     ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
**     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
**     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
**     ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
**     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
**     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
**     http:                 www.nxp.com
**     mail:                 support@nxp.com
**
**     Revisions:
**     - rev. 1.0 (2015-08-19)
**         Initial version.
**     - rev. 2.0 (2015-09-22)
**         Based on rev0final RDP, add PCC/TRGMUX.
**     - rev. 3.0 (2015-12-29)
**         Align LPFLL register names.
**     - rev. 4.0 (2016-02-19)
**         Based on rev1final RDP.
**     - rev. 5.0 (2016-08-02)
**         Based on rev1.x RDP.
**     - rev. 6.0 (2016-09-20)
**         Based on rev2 RDP.
**
** ###################################################################
*/

/*!
 * @file MKE15Z7
 * @version 6.0
 * @date 2016-09-20
 * @brief Device specific configuration file for MKE15Z7 (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"



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

uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;

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

void SystemInit (void) {

  /* Redirect vector table to Flash, in case of boot from ROM without overwriting FOPT boot option */
  RCM->MR = 3 << 1;

#if (DISABLE_WDOG)
  WDOG->CNT = WDOG_UPDATE_KEY;
  WDOG->TOVAL = 0xFFFF;
  WDOG->CS = (uint32_t) ((WDOG->CS) & ~WDOG_CS_EN_MASK) | WDOG_CS_UPDATE_MASK;
#endif /* (DISABLE_WDOG) */

}

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

void SystemCoreClockUpdate (void) {

  uint32_t SCGOUTClock;                                 /* Variable to store output clock frequency of the SCG module */
  uint16_t Divider;
  Divider = ((SCG->CSR & SCG_CSR_DIVCORE_MASK) >> SCG_CSR_DIVCORE_SHIFT) + 1;

  switch ((SCG->CSR & SCG_CSR_SCS_MASK) >> SCG_CSR_SCS_SHIFT) {
    case 0x1:
      /* System OSC */
      SCGOUTClock = CPU_XTAL_CLK_HZ;
      break;
    case 0x2:
      /* Slow IRC */
      SCGOUTClock = (((SCG->SIRCCFG & SCG_SIRCCFG_RANGE_MASK) >> SCG_SIRCCFG_RANGE_SHIFT) ? 8000000 : 2000000);
      break;
    case 0x3:
      /* Fast IRC */
      SCGOUTClock = 48000000 + ((SCG->FIRCCFG & SCG_FIRCCFG_RANGE_MASK) >> SCG_FIRCCFG_RANGE_SHIFT) * 4000000;
      break;
    case 0x5:
      /* Low Power FLL */
      SCGOUTClock = 48000000 + ((SCG->LPFLLCFG & SCG_LPFLLCFG_FSEL_MASK) >> SCG_LPFLLCFG_FSEL_SHIFT) * 24000000;
      break;
    default:
      return;
  }
  SystemCoreClock = (SCGOUTClock / Divider);

}
