text: /**
   * Copyright (c) 2014 - 2018, Nordic Semiconductor ASA
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form, except as embedded into a Nordic
   *    Semiconductor ASA integrated circuit in a product or a software update for
   *    such product, 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.
   *
   * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
   *    contributors may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   *
   * 4. This software, with or without modification, must only be used with a
   *    Nordic Semiconductor ASA integrated circuit.
   *
   * 5. Any software provided in binary form under this license must not be reverse
   *    engineered, decompiled, modified and/or disassembled.
   *
   * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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   */
  /** @file
   * @defgroup pin_change_int_example_main main.c
   * @{
   * @ingroup pin_change_int_example
   * @brief Pin Change Interrupt Example Application main file.
   *
   * This file contains the source code for a sample application using interrupts triggered by GPIO pins.
   *
   */
  
  #include <stdbool.h>
  #include "nrf.h"
  #include "nrf_drv_gpiote.h"
  #include "app_error.h"
  #include "boards.h"
  
  #ifdef BSP_BUTTON_0
      #define PIN_IN BSP_BUTTON_0
  #endif
  #ifndef PIN_IN
      #error "Please indicate input pin"
  #endif
  
  #ifdef BSP_LED_0
      #define PIN_OUT BSP_LED_0
  #endif
  #ifndef PIN_OUT
      #error "Please indicate output pin"
  #endif
  
  void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
  {
      nrf_drv_gpiote_out_toggle(PIN_OUT);
  }
  /**
   * @brief Function for configuring: PIN_IN pin for input, PIN_OUT pin for output,
   * and configures GPIOTE to give an interrupt on pin change.
   */
  static void gpio_init(void)
  {
      ret_code_t err_code;
  
      err_code = nrf_drv_gpiote_init();
      APP_ERROR_CHECK(err_code);
  
      nrf_drv_gpiote_out_config_t out_config = GPIOTE_CONFIG_OUT_SIMPLE(false);
  
      err_code = nrf_drv_gpiote_out_init(PIN_OUT, &out_config);
      APP_ERROR_CHECK(err_code);
  
      nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(true);
      in_config.pull = NRF_GPIO_PIN_PULLUP;
  
      err_code = nrf_drv_gpiote_in_init(PIN_IN, &in_config, in_pin_handler);
      APP_ERROR_CHECK(err_code);
  
      nrf_drv_gpiote_in_event_enable(PIN_IN, true);
  }
  
  /**
   * @brief Function for application main entry.
   */
  int main(void)
  {
      gpio_init();
  
      while (true)
      {
          // Do nothing.
      }
  }
  
  
  /** @} */
  