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     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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    16 ** GNU Lesser General Public License Usage

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    40 ****************************************************************************/

    41 

    42 #include "compasssym.h"

    43 

    44 /**

    45  * set the id of the accelerometer sensor

    46  */

    47 const char *CCompassSym::id("sym.compass");

    48 

    49 /**

    50  * Factory function, this is used to create the compass object

    51  * @return CCompassSym if successful, leaves on failure

    52  */

    53 CCompassSym* CCompassSym::NewL(QSensor *sensor)

    54     {

    55     CCompassSym* self = new (ELeave) CCompassSym(sensor);

    56     CleanupStack::PushL(self);

    57     self->ConstructL();

    58     CleanupStack::Pop();

    59     return self;    

    60     }

    61 

    62 /**

    63  * Destructor

    64  * Closes the backend resources

    65  */

    66 CCompassSym::~CCompassSym()

    67     {

    68     delete iMagnetometer;

    69     Close();

    70     }

    71 

    72 /**

    73  * Default constructor

    74  */

    75 CCompassSym::CCompassSym(QSensor *sensor):CSensorBackendSym(sensor)

    76     {

    77     setReading<QCompassReading>(&iReading);

    78     iBackendData.iSensorType = KSensrvChannelTypeIdMagneticNorthData;

    79     }

    80 

    81 /**

    82  * start() overrides CSensorBackendSym::start()

    83  * This is to allow starting magnetometer before stopping the compass 

    84  */

    85 void CCompassSym::start()

    86     {

    87     // start the magnetometer

    88     iMagnetometer->start();

    89     // start the compass backend

    90     CSensorBackendSym::start();

    91     }

    92 

    93 /**

    94  * stop() overrides CSensorBackendSym::stop()

    95  * This is to allow stopping magnetometer before stopping the compass 

    96  */

    97 void CCompassSym::stop()

    98     {

    99     // stop the magnetometer

   100     iMagnetometer->stop();

   101     // start the compass backend

   102     CSensorBackendSym::stop();

   103     }

   104 

   105 /*

   106  * RecvData is used to retrieve the sensor reading from sensor server

   107  * It is implemented here to handle compass sensor specific

   108  * reading data and provides conversion and utility code

   109  */  

   110 void CCompassSym::RecvData(CSensrvChannel &aChannel)

   111     {

   112     TPckg<TSensrvMagneticNorthData> proxpkg( iData );

   113     TInt ret = aChannel.GetData( proxpkg );

   114     if(KErrNone != ret)

   115         {

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

   117         return;

   118         }

   119     // Get a lock on the reading data

   120     iBackendData.iReadingLock.Wait();    

   121     iReading.setAzimuth(iData.iAngleFromMagneticNorth);

   122     // Retrieve and set the calibration level

   123     iReading.setCalibrationLevel(iMagnetometer->GetCalibrationLevel());

   124     // Set the timestamp

   125     iReading.setTimestamp(iData.iTimeStamp.Int64());

   126     // Release the lock

   127     iBackendData.iReadingLock.Signal();

   128     }

   129 

   130 /**

   131  * Second phase constructor

   132  * Initialize the backend resources

   133  */

   134 void CCompassSym::ConstructL()

   135     {

   136     // Initialize the backend

   137     InitializeL();

   138     // Create magnetometer, this is required as in sensor server,

   139     // calibration data is available only for magnetometer

   140     iMagnetometer = CMagnetometerSensorSym::NewL(NULL);

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

   142     // interested only in calibration property

   143     iMagnetometer->SetListening(EFalse, ETrue);

   144     }

   145