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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "compasssym.h"
/**
* set the id of the accelerometer sensor
*/
char const * const CCompassSym::id("sym.compass");
/**
* Factory function, this is used to create the compass object
* @return CCompassSym if successful, leaves on failure
*/
CCompassSym* CCompassSym::NewL(QSensor *sensor)
{
CCompassSym* self = new (ELeave) CCompassSym(sensor);
CleanupStack::PushL(self);
self->ConstructL();
CleanupStack::Pop();
return self;
}
/**
* Destructor
* Closes the backend resources
*/
CCompassSym::~CCompassSym()
{
delete iMagnetometer;
Close();
}
/**
* Default constructor
*/
CCompassSym::CCompassSym(QSensor *sensor):CSensorBackendSym(sensor)
{
setReading<QCompassReading>(&iReading);
iBackendData.iSensorType = KSensrvChannelTypeIdMagneticNorthData;
}
/**
* start() overrides CSensorBackendSym::start()
* This is to allow starting magnetometer before stopping the compass
*/
void CCompassSym::start()
{
// start the magnetometer
iMagnetometer->start();
// start the compass backend
CSensorBackendSym::start();
}
/**
* stop() overrides CSensorBackendSym::stop()
* This is to allow stopping magnetometer before stopping the compass
*/
void CCompassSym::stop()
{
// stop the magnetometer
iMagnetometer->stop();
// start the compass backend
CSensorBackendSym::stop();
}
/*
* DataReceived is used to retrieve the sensor reading from sensor server
* It is implemented here to handle compass sensor specific
* reading data and provides conversion and utility code
*/
void CCompassSym::DataReceived(CSensrvChannel &aChannel, TInt aCount, TInt /*aDataLost*/)
{
ProcessData(aChannel, aCount, iData);
}
void CCompassSym::ProcessReading()
{
// Get a lock on the reading data
iBackendData.iReadingLock.Wait();
iReading.setAzimuth(iData.iAngleFromMagneticNorth);
// Retrieve and set the calibration level
iReading.setCalibrationLevel(iMagnetometer->GetCalibrationLevel());
// Set the timestamp
iReading.setTimestamp(iData.iTimeStamp.Int64());
// Release the lock
iBackendData.iReadingLock.Signal();
// Notify that a reading is available
newReadingAvailable();
}
/**
* Second phase constructor
* Initialize the backend resources
*/
void CCompassSym::ConstructL()
{
// Initialize the backend
InitializeL();
// Create magnetometer, this is required as in sensor server,
// calibration data is available only for magnetometer
// We need to have a QSensor instance for the magnetometer backend or we will crash
iMagnetometer = CMagnetometerSensorSym::NewL(new QSensor("QMagnetometer", this));
// Listen only for property change on magnetometer as we are
// interested only in calibration property
iMagnetometer->SetListening(EFalse, ETrue);
}
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