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#include "compasssym.h"

/**

 * set the id of the accelerometer sensor

 */

const char *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();

    }

/*

 * RecvData 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::RecvData(CSensrvChannel &aChannel)

    {

    TPckg<TSensrvMagneticNorthData> proxpkg( iData );

    TInt ret = aChannel.GetData( proxpkg );

    if(KErrNone != ret)

        {

        // If there is no reading available, return without setting

        return;

        }

    // 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();

    }

/**

 * 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

    iMagnetometer = CMagnetometerSensorSym::NewL(NULL);

    // Listen only for property change on magnetometer as we are

    // interested only in calibration property

    iMagnetometer->SetListening(EFalse, ETrue);

    }