/****************************************************************************
 *
 *   Copyright (c) 2013-2015 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
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/**
 * @file airspeed.cpp
 * @author Simon Wilks <simon@px4.io>
 * @author Lorenz Meier <lorenz@px4.io>
 *
 */

#include <px4_platform_common/px4_config.h>
#include <drivers/device/device.h>

#include <drivers/device/i2c.h>

#include <systemlib/err.h>
#include <parameters/param.h>
#include <perf/perf_counter.h>

#include <drivers/drv_hrt.h>

#include <uORB/topics/differential_pressure.h>

#include <drivers/airspeed/airspeed.h>

Airspeed::Airspeed(int bus, int bus_frequency, int address, unsigned conversion_interval) :
	I2C(0, "Airspeed", bus, address, bus_frequency),
	_sensor_ok(false),
	_measure_interval(conversion_interval),
	_collect_phase(false),
	_conversion_interval(conversion_interval),
	_sample_perf(perf_alloc(PC_ELAPSED, "aspd_read")),
	_comms_errors(perf_alloc(PC_COUNT, "aspd_com_err"))
{
}

Airspeed::~Airspeed()
{
	// free perf counters
	perf_free(_sample_perf);
	perf_free(_comms_errors);
}

int
Airspeed::init()
{
	/* do I2C init (and probe) first */
	if (I2C::init() != PX4_OK) {
		return PX4_ERROR;
	}

	/* advertise sensor topic, measure manually to initialize valid report */
	measure();

	return PX4_OK;
}

int
Airspeed::probe()
{
	/* on initial power up the device may need more than one retry
	   for detection. Once it is running the number of retries can
	   be reduced
	*/
	_retries = 1;
	int ret = measure();

	return ret;
}