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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "iospressure.h"
#import <CoreMotion/CoreMotion.h>
char const * const IOSPressure::id("ios.pressure");
QT_BEGIN_NAMESPACE
int IOSPressure::s_startCount = 0;
IOSPressure::IOSPressure(QSensor *sensor)
: QSensorBackend(sensor)
{
m_altimeter = [[CMAltimeter alloc] init];
setReading<QPressureReading>(&m_reading);
addDataRate(1, 100); // 100Hz
}
IOSPressure::~IOSPressure()
{
[m_altimeter stopRelativeAltitudeUpdates];
[m_altimeter release];
}
void IOSPressure::start()
{
if (m_timer != 0)
return;
int hz = sensor()->dataRate();
m_timer = startTimer(1000 / (hz == 0 ? 60 : hz));
if (++s_startCount == 1) {
[m_altimeter startRelativeAltitudeUpdatesToQueue:[NSOperationQueue mainQueue]
withHandler:^(CMAltitudeData * _Nullable altitudeData , NSError * _Nullable error) {
if (error == nil) {
m_reading.setPressure([altitudeData.pressure doubleValue] * 1000);
m_reading.setTimestamp(quint64(altitudeData.timestamp * 1e6));
}
}];
}
}
void IOSPressure::stop()
{
if (m_timer == 0)
return;
killTimer(m_timer);
m_timer = 0;
if (--s_startCount == 0)
[m_altimeter stopRelativeAltitudeUpdates];
}
void IOSPressure::timerEvent(QTimerEvent *)
{
// skip update if NaN or 0
if ((m_reading.pressure() != m_reading.pressure()) ||
m_reading.pressure() == 0)
return;
newReadingAvailable();
}
QT_END_NAMESPACE
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