/**************************************************************************//**
 * @file
 * @brief Simple LED Blink Demo for EFM32GG_DK3750
 * @author Energy Micro AS
 * @version 3.20.3
 ******************************************************************************
 * @section License
 * <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
 *******************************************************************************
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 * 4. The source and compiled code may only be used on Energy Micro "EFM32"
 *    microcontrollers and "EFR4" radios.
 *
 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
 * obligation to support this Software. Energy Micro AS is providing the
 * Software "AS IS", with no express or implied warranties of any kind,
 * including, but not limited to, any implied warranties of merchantability
 * or fitness for any particular purpose or warranties against infringement
 * of any proprietary rights of a third party.
 *
 * Energy Micro AS will not be liable for any consequential, incidental, or
 * special damages, or any other relief, or for any claim by any third party,
 * arising from your use of this Software.
 *
 *****************************************************************************/
#include "em_device.h"
#include "em_cmu.h"
#include "em_gpio.h"

/* Counts 1ms timeTicks */
volatile uint32_t msTicks;

/* Local prototypes */
void Delay(uint32_t dlyTicks);

/**************************************************************************//**
* @brief SysTick_Handler
* Interrupt Service Routine for system tick counter
 *****************************************************************************/
void SysTick_Handler(void)
{
    msTicks++; /* increment counter necessary in Delay()*/
}

/**************************************************************************//**
 * @brief Delays number of msTick Systicks (typically 1 ms)
 * @param dlyTicks Number of ticks to delay
 *****************************************************************************/
void Delay(uint32_t dlyTicks)
{
    uint32_t curTicks;

    curTicks = msTicks;
    while ((msTicks - curTicks) < dlyTicks);
}

/**************************************************************************//**
 * @brief  Main function
 *****************************************************************************/
int main(void)
{
    int i;

    /* Setup SysTick Timer for 1 msec interrupts */
    if (SysTick_Config(CMU_ClockFreqGet(cmuClock_CORE) / 1000)) while (1);

    CMU_ClockEnable(cmuClock_HFPER, true);
    CMU_ClockEnable(cmuClock_GPIO, true);

    // Enable clocks and configure pins
    for (i = 1; i < 5; ++i) {
        GPIO_PinModeSet(gpioPortD, i, gpioModePushPull, 0);
    }

    /* Infinite blink loop */
    while (1) {
        for (i = 1; i < 5; ++i) {
            GPIO_PinOutToggle(gpioPortD, i);
            Delay(200);
        }
    }
}

