text: /****************************************************************************
   *
   *   Copyright (c) 2013 PX4 Development Team. 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 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 PX4 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 OWNER 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.
   *
   ****************************************************************************/
  
  /**
   * @file sitl_led.c
   *
   * sitl LED backend.
   */
  
  #include <px4_config.h>
  #include <px4_log.h>
  #include <stdbool.h>
  #include <systemlib/px4_macros.h>
  
  __BEGIN_DECLS
  extern void led_init(void);
  extern void led_on(int led);
  extern void led_off(int led);
  extern void led_toggle(int led);
  __END_DECLS
  
  static bool _led_state[] = { false, false, false, false };
  
  __EXPORT void led_init()
  {
  	PX4_DEBUG("LED_INIT");
  }
  
  __EXPORT void led_on(int led)
  {
  	if ((unsigned int)led < arraySize(_led_state)) {
  		PX4_DEBUG("LED%d_ON", led);
  		_led_state[led] = true;
  	}
  }
  
  __EXPORT void led_off(int led)
  {
  	if ((unsigned int)led < arraySize(_led_state)) {
  		PX4_DEBUG("LED%d_OFF", led);
  		_led_state[led] = false;
  	}
  }
  
  __EXPORT void led_toggle(int led)
  {
  	if ((unsigned int)led < arraySize(_led_state)) {
  		_led_state[led] = !_led_state[led];
  		PX4_DEBUG("LED%d_TOGGLE: %s", led, _led_state[led] ? "ON" : "OFF");
  
  	}
  }
  