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/****************************************************************************
*
* Copyright (c) 2014 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 mavlink_stream.cpp
* Mavlink messages stream implementation.
*
* @author Anton Babushkin <anton.babushkin@me.com>
*/
#include <stdlib.h>
#include "mavlink_stream.h"
#include "mavlink_main.h"
MavlinkStream::MavlinkStream() :
next(nullptr),
_channel(MAVLINK_COMM_0),
_interval(1000000),
_last_sent(0)
{
}
MavlinkStream::~MavlinkStream()
{
}
/**
* Set messages interval in ms
*/
void
MavlinkStream::set_interval(const unsigned int interval)
{
_interval = interval;
}
/**
* Set mavlink channel
*/
void
MavlinkStream::set_channel(mavlink_channel_t channel)
{
_channel = channel;
}
/**
* Update subscriptions and send message if necessary
*/
int
MavlinkStream::update(const hrt_abstime t)
{
uint64_t dt = t - _last_sent;
if (dt > 0 && dt >= _interval) {
/* interval expired, send message */
send(t);
_last_sent = (t / _interval) * _interval;
return 0;
}
return -1;
}
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