/*
 * Copyright (c) 2015, Freescale Semiconductor, Inc.
 * Copyright 2016-2017 NXP
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include "board.h"
#include "fsl_debug_console.h"
#include "fsl_gpio.h"
#include "fsl_common.h"
#include "pin_mux.h"
#include "clock_config.h"
/*******************************************************************************
 * Definitions
 ******************************************************************************/
#define EXAMPLE_LED_GPIO     BOARD_USER_LED_GPIO
#define EXAMPLE_LED_GPIO_PIN BOARD_USER_LED_GPIO_PIN
#define EXAMPLE_DELAY_COUNT  8000000

#define EXAMPLE_SW_GPIO BOARD_USER_BUTTON_GPIO
#define EXAMPLE_SW_GPIO_PIN BOARD_USER_BUTTON_GPIO_PIN
#define EXAMPLE_SW_IRQ BOARD_USER_BUTTON_IRQ
#define EXAMPLE_GPIO_IRQHandler BOARD_USER_BUTTON_IRQ_HANDLER


#define EXAMPLE_SW_NAME BOARD_USER_BUTTON_NAME
/*******************************************************************************
 * Prototypes
 ******************************************************************************/
/*!
 * @brief delay a while.
 */
void delay(void);
volatile bool g_InputSignal = true;
/*******************************************************************************
 * Variables
 ******************************************************************************/
/* The PIN status */
volatile bool g_pinSet = false;
/*******************************************************************************
 * Code
 ******************************************************************************/
void delay(void)
{
    volatile uint32_t i = 0;
    for (i = 0; i < 1000000; ++i)
    {
        __asm("NOP"); /* delay */
    }
}

/*!
 * @brief Main function
 */
void EXAMPLE_GPIO_IRQHandler(void)
{
	PRINTF("inside IRQ handler...\r\n");
   /* clear the interrupt status */
   GPIO_PortClearInterruptFlags(EXAMPLE_SW_GPIO, 1U << EXAMPLE_SW_GPIO_PIN);
   /* Change state of switch. */

   g_InputSignal = true;
   /* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
     exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
   __DSB();
#endif
}
int main(void)
{
   /* Define the init structure for the input switch pin */
   gpio_pin_config_t sw_config = {
       kGPIO_DigitalInput,
       0,
       kGPIO_IntRisingEdge,
   };

   /* hardware initialiize, include IOMUX, Uart debug initialize */
   BOARD_ConfigMPU();
   BOARD_InitPins();
   BOARD_BootClockRUN();
   BOARD_InitDebugConsole();
   PRINTF("GPIO Driver example.\r\n");

   /* Init input switch GPIO. */
   EnableIRQ(EXAMPLE_SW_IRQ);
   GPIO_PinInit(EXAMPLE_SW_GPIO, EXAMPLE_SW_GPIO_PIN, &sw_config);

   /* Enable GPIO pin interrupt */
   GPIO_PortEnableInterrupts(EXAMPLE_SW_GPIO, 1U << EXAMPLE_SW_GPIO_PIN);

   while (1)
   {
       if (g_InputSignal)
       {
           delay();
           if (1 == GPIO_PinRead(EXAMPLE_SW_GPIO, EXAMPLE_SW_GPIO_PIN))
           {
               PRINTF("%s is turned on.\r\n", EXAMPLE_SW_NAME);
           }

           /* Reset state of switch. */
           g_InputSignal = false;
       }
   }
}