/**************************************************************************//**
 * @file     system_ADuCM360.c
 * @brief    CMSIS Device System Source File for
 *           Analog Devices ADuCM360 Device Series
 * @version  V2.00
 * @date     October 2015
 *
 * @note
 * Copyright (C) 2012 ARM Limited. All rights reserved.
 * Copyright (C) 2015 Analog Devices. All rights reserved.
 *
 * @par
 * ARM Limited (ARM) is supplying this software for use with Cortex-M
 * processor based microcontrollers.  This file can be freely distributed
 * within development tools that are supporting such ARM based processors.
 *
 * @par
 * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
 * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
 * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
 * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
 *
 ******************************************************************************/

#include "ADuCM360.h"

/*----------------------------------------------------------------------------
 Define clocks
 *----------------------------------------------------------------------------*/
#define __HFOSC           (16000000UL)    /* Oscillator frequency             */
#define __XTAL               (32768UL)    /* 32kHz Frequency                  */

/*----------------------------------------------------------------------------
 Clock Variable definitions
 *----------------------------------------------------------------------------*/
uint32_t SystemCoreClock; /*!< System Clock Frequency (Core Clock)*/
uint32_t uClk; /* Undivided System Clock Frequency (UCLK)   */

/* Frequency of the external clock source connected to P1.0 */
uint32_t SystemExtClock;

/*----------------------------------------------------------------------------
 Clock functions
 *----------------------------------------------------------------------------*/
void SystemCoreClockUpdate(void) /* Get Core Clock Frequency      */
{
	int iDiv;

	switch (pADI_CLKCTL->CLKCON0 & CLKCON0_CLKMUX_MSK) {
	case CLKCON0_CLKMUX_HFOSC:
		uClk = __HFOSC >> (pADI_CLKCTL->CLKSYSDIV & CLKSYSDIV_DIV2EN_MSK);
		break;

	case CLKCON0_CLKMUX_LFOSC:
	case CLKCON0_CLKMUX_LFXTAL:
		uClk = __XTAL;
		break;

	case CLKCON0_CLKMUX_EXTCLK:
		uClk = SystemExtClock;
		break;

	default:
		break;
	}

	iDiv = (pADI_CLKCTL->CLKCON0 & CLKCON0_CD_MSK); // Read CLKCON0 divider bits
	SystemCoreClock = uClk >> iDiv;
}

/**
 * Initialize the system
 *
 * @param  none
 * @return none
 *
 * @brief  Setup the microcontroller system.
 *         Initialize the System.
 */
void SystemInit(void)
{
	/* SetSystemExtClkFreq(Freq); // if an external clock is used SetSystemExtClkFreq must be called
	 // before calling SystemCoreClockUpdate() */

	pADI_WDT->T3CON = 0; /* disable watchdog */
	pADI_CLKCTL->CLKCON0 = 0x0; /* 16MHz output of UCLK divide */
	pADI_CLKCTL->CLKSYSDIV = 0; /* No divide of 16MHz system clock */
	pADI_CLKCTL->CLKCON1 =
		0x0; /* PWM = 16MHz, UART = 16MHz, SPI1 = 16MHz, SPI0=16MHz */
	pADI_CLKCTL->CLKDIS = 0x0; /* Enable clock to all peripherals */

	/* compute internal clocks */
	SystemCoreClockUpdate();

	/* Set all three (USGFAULTENA, BUSFAULTENA, and MEMFAULTENA) fault enable bits
	 * in the System Control Block, System Handler Control and State Register
	 * otherwise these faults are handled as hard faults.
	 */

	SCB->SHCSR |= SCB_SHCSR_USGFAULTENA_Msk | SCB_SHCSR_BUSFAULTENA_Msk |
		      SCB_SHCSR_MEMFAULTENA_Msk; //enable exception

	__ISB();
	__DSB();
}

/**
 * @brief  Sets the system external clock frequency
 *
 * @param  ExtClkFreq   External clock frequency in Hz
 * @return none
 *
 * Sets the clock frequency of the source connected to P1.0 clock input source
 */
void SetSystemExtClkFreq(uint32_t ExtClkFreq)
{
	SystemExtClock = ExtClkFreq;
}

/**
 * @brief  Gets the system external clock frequency
 *
 * @return External Clock frequency
 *
 * Gets the clock frequency of the source connected to P1.0 clock input source
 */
uint32_t GetSystemExtClkFreq(void)
{
	return SystemExtClock;
}