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| |
| #include "iosmotionmanager.h" |
| #include "iosmagnetometer.h" |
| |
| #import <CoreMotion/CoreMotion.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| char const * const IOSMagnetometer::id("ios.magnetometer"); |
| |
| int IOSMagnetometer::s_magnetometerStartCount = 0; |
| int IOSMagnetometer::s_deviceMotionStartCount = 0; |
| |
| IOSMagnetometer::IOSMagnetometer(QSensor *sensor) |
| : QSensorBackend(sensor) |
| , m_motionManager([QIOSMotionManager sharedManager]) |
| , m_timer(0) |
| , m_returnGeoValues(false) |
| { |
| setReading<QMagnetometerReading>(&m_reading); |
| // Technical information about data rate is not found, but |
| // seems to be ~70Hz after testing on iPad4: |
| addDataRate(1, 70); |
| // Output range is +/- 2 gauss (0.0002 tesla) and can sense magnetic fields less than |
| // 100 microgauss (1e-08 tesla) Ref: "iOS Sensor Programming", Alasdair, 2012. |
| addOutputRange(-0.0002, 0.0002, 1e-08); |
| } |
| |
| void IOSMagnetometer::start() |
| { |
| if (m_timer != 0) |
| return; |
| |
| int hz = sensor()->dataRate(); |
| m_timer = startTimer(1000 / (hz == 0 ? 60 : hz)); |
| m_returnGeoValues = static_cast<QMagnetometer *>(sensor())->returnGeoValues(); |
| |
| if (m_returnGeoValues) { |
| if (++s_deviceMotionStartCount == 1) |
| [m_motionManager startDeviceMotionUpdates]; |
| } else { |
| if (++s_magnetometerStartCount == 1) |
| [m_motionManager startMagnetometerUpdates]; |
| } |
| } |
| |
| void IOSMagnetometer::stop() |
| { |
| if (m_timer == 0) |
| return; |
| |
| killTimer(m_timer); |
| m_timer = 0; |
| |
| if (m_returnGeoValues) { |
| if (--s_deviceMotionStartCount == 0) |
| [m_motionManager stopDeviceMotionUpdates]; |
| } else { |
| if (--s_magnetometerStartCount == 0) |
| [m_motionManager stopMagnetometerUpdates]; |
| } |
| } |
| |
| void IOSMagnetometer::timerEvent(QTimerEvent *) |
| { |
| CMMagneticField field; |
| |
| if (m_returnGeoValues) { |
| CMDeviceMotion *deviceMotion = m_motionManager.deviceMotion; |
| CMCalibratedMagneticField calibratedField = deviceMotion.magneticField; |
| field = calibratedField.field; |
| // skip update if NaN |
| if (field.x != field.x || field.y != field.y || field.z != field.z) |
| return; |
| m_reading.setTimestamp(quint64(deviceMotion.timestamp * 1e6)); |
| |
| switch (calibratedField.accuracy) { |
| case CMMagneticFieldCalibrationAccuracyUncalibrated: |
| m_reading.setCalibrationLevel(0.0); |
| break; |
| case CMMagneticFieldCalibrationAccuracyLow: |
| m_reading.setCalibrationLevel(0.3); |
| break; |
| case CMMagneticFieldCalibrationAccuracyMedium: |
| m_reading.setCalibrationLevel(0.6); |
| break; |
| case CMMagneticFieldCalibrationAccuracyHigh: |
| m_reading.setCalibrationLevel(1.0); |
| break; |
| } |
| } else { |
| CMMagnetometerData *data = m_motionManager.magnetometerData; |
| field = data.magneticField; |
| // skip update if NaN |
| if (field.x != field.x || field.y != field.y || field.z != field.z) |
| return; |
| m_reading.setTimestamp(quint64(data.timestamp * 1e6)); |
| m_reading.setCalibrationLevel(1.0); |
| } |
| |
| // Convert NSTimeInterval to microseconds and microtesla to tesla: |
| m_reading.setX(qreal(field.x) / 1e6); |
| m_reading.setY(qreal(field.y) / 1e6); |
| m_reading.setZ(qreal(field.z) / 1e6); |
| newReadingAvailable(); |
| } |
| |
| QT_END_NAMESPACE |