/*
** ###################################################################
**     Processors:          MKL03Z16VFG4
**                          MKL03Z16VFK4
**                          MKL03Z32CAF4
**                          MKL03Z32VFG4
**                          MKL03Z32VFK4
**                          MKL03Z8VFG4
**                          MKL03Z8VFK4
**
**     Compilers:           Keil ARM C/C++ Compiler
**                          Freescale C/C++ for Embedded ARM
**                          GNU C Compiler
**                          IAR ANSI C/C++ Compiler for ARM
**
**     Reference manual:    KL03P24M48SF0RM, Rev 2, Apr 2014
**     Version:             rev. 1.4, 2014-08-28
**     Build:               b151217
**
**     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) 2015 Freescale Semiconductor, Inc.
**     All rights reserved.
**
**     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 Freescale Semiconductor, Inc. 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.freescale.com
**     mail:                 support@freescale.com
**
**     Revisions:
**     - rev. 1.0 (2013-12-11)
**         Initial version.
**     - rev. 1.1 (2014-04-16)
**         Update of the I2C module (SMBUS feature).
**         Update of the MCG_Light module.
**         Added register file system (RFSYS).
**     - rev. 1.2 (2014-04-30)
**         PEx compatibility macros has been added.
**     - rev. 1.3 (2014-06-27)
**         I2C_S1 register was renamed.
**         GPIO - Modules PTA,PTB renamed to GPIOA,GPIOB.
**     - rev. 1.4 (2014-08-28)
**         Update of system files - default clock configuration changed.
**         Update of startup files - possibility to override DefaultISR added.
**
** ###################################################################
*/

/*!
 * @file MKL03Z4
 * @version 1.4
 * @date 2014-08-28
 * @brief Device specific configuration file for MKL03Z4 (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) {

#if (ACK_ISOLATION)
  if(PMC->REGSC &  PMC_REGSC_ACKISO_MASK) {
    PMC->REGSC |= PMC_REGSC_ACKISO_MASK; /* VLLSx recovery */
  }
#endif

#if (DISABLE_WDOG)
  /* SIM->COPC: ?=0,COPCLKSEL=0,COPDBGEN=0,COPSTPEN=0,COPT=0,COPCLKS=0,COPW=0 */
  SIM->COPC = (uint32_t)0x00u;
#endif /* (DISABLE_WDOG) */

}

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

void SystemCoreClockUpdate (void) {

  uint32_t MCGOUTClock;                                 /* Variable to store output clock frequency of the MCG module */
  uint16_t Divider;

  if ((MCG->S & MCG_S_CLKST_MASK) == 0x00U) {
    /* High internal reference clock is selected */
    MCGOUTClock = CPU_INT_FAST_CLK_HZ;                                  /* Fast internal reference clock selected */
  } else if ((MCG->S & MCG_S_CLKST_MASK) == 0x04U) {
    /* Internal reference clock is selected */
    Divider = (uint16_t)(0x01LU << ((MCG->SC & MCG_SC_FCRDIV_MASK) >> MCG_SC_FCRDIV_SHIFT));
    MCGOUTClock = (uint32_t) (CPU_INT_SLOW_CLK_HZ / Divider);           /* Slow internal reference clock 8MHz selected */
  } else if ((MCG->S & MCG_S_CLKST_MASK) == 0x08U) {
    /* External reference clock is selected */
    MCGOUTClock = CPU_XTAL_CLK_HZ;
  } else {
    /* Reserved value */
    return;
  } /* (!((MCG->S & MCG_S_CLKST_MASK) == 0x08U)) */
  SystemCoreClock = (MCGOUTClock / (0x01U + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT)));

}