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// Copyright (C) 2016 Lorn Potter
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "iosaccelerometer.h"
#include "iosmotionmanager.h"
#import <CoreMotion/CoreMotion.h>
char const * const IOSAccelerometer::id("ios.accelerometer");
QT_BEGIN_NAMESPACE
int IOSAccelerometer::s_startCount = 0;
IOSAccelerometer::IOSAccelerometer(QSensor *sensor)
: QSensorBackend(sensor)
, m_motionManager([QIOSMotionManager sharedManager])
, m_timer(0)
{
setReading<QAccelerometerReading>(&m_reading);
addDataRate(1, 100); // 100Hz
addOutputRange(-22.418, 22.418, 0.17651); // 2G
}
void IOSAccelerometer::start()
{
if (m_timer != 0)
return;
int hz = sensor()->dataRate();
m_timer = startTimer(1000 / (hz == 0 ? 60 : hz));
if (++s_startCount == 1)
[m_motionManager startAccelerometerUpdates];
}
void IOSAccelerometer::stop()
{
if (m_timer == 0)
return;
killTimer(m_timer);
m_timer = 0;
if (--s_startCount == 0)
[m_motionManager stopAccelerometerUpdates];
}
void IOSAccelerometer::timerEvent(QTimerEvent *)
{
// Convert from NSTimeInterval to microseconds and G to m/s2, and flip axes:
CMAccelerometerData *data = m_motionManager.accelerometerData;
CMAcceleration acc = data.acceleration;
// skip update if NaN
if (acc.x != acc.x || acc.y != acc.y || acc.z != acc.z)
return;
static const qreal G = 9.8066;
m_reading.setTimestamp(quint64(data.timestamp * 1e6));
m_reading.setX(qreal(acc.x) * G * -1);
m_reading.setY(qreal(acc.y) * G * -1);
m_reading.setZ(qreal(acc.z) * G * -1);
newReadingAvailable();
}
QT_END_NAMESPACE
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