qtmobility/plugins/sensors/maemo6/maemo6accelerometer.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 23 Jun 2010 19:08:38 +0300
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Revision: 201023 Kit: 2010125
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Mobility Components.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "maemo6accelerometer.h"
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char const * const maemo6accelerometer::id("maemo6.accelerometer");
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bool maemo6accelerometer::m_initDone = false;
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maemo6accelerometer::maemo6accelerometer(QSensor *sensor)
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    : maemo6sensorbase(sensor)
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{
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    const QString sensorName = "accelerometersensor";
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    initSensor<AccelerometerSensorChannelInterface>(sensorName, m_initDone);
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    if (m_sensorInterface){
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        if (!(QObject::connect(m_sensorInterface, SIGNAL(dataAvailable(const XYZ&)),
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                               this, SLOT(slotDataAvailable(const XYZ&)))))
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            qWarning() << "Unable to connect "<< sensorName;
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    }
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    else
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        qWarning() << "Unable to initialize "<<sensorName;
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    setReading<QAccelerometerReading>(&m_reading);
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    // adding metadata
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    addDataRate(1, 130); // 130 Hz
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    //addDataRate(400, 400); // 400Hz
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    // accuracy - or resolution???
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    // 2^8 = 256    256/2 - 1 = 127
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    addOutputRange(-2*GRAVITY_EARTH, 2*GRAVITY_EARTH, 2*GRAVITY_EARTH/127); // 2G
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    //addOutputRange(-8*GRAVITY_EARTH, 8*GRAVITY_EARTH, 8*GRAVITY_EARTH/127); // 8G
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    setDescription(QLatin1String("Measures x, y, and z axes accelerations in m/s^2"));
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}
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void maemo6accelerometer::slotDataAvailable(const XYZ& data)
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{
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    // Convert from milli-Gs to meters per second per second
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    // Using 1 G = 9.80665 m/s^2
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    qreal ax = -data.x() * GRAVITY_EARTH_THOUSANDTH;
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    qreal ay = -data.y() * GRAVITY_EARTH_THOUSANDTH;
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    qreal az = -data.z() * GRAVITY_EARTH_THOUSANDTH;
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    m_reading.setX(ax);
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    m_reading.setY(ay);
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    m_reading.setZ(az);
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    m_reading.setTimestamp(data.XYZData().timestamp_);
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    newReadingAvailable();
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}