/** Calculates a difference between the system UTC time and the GPS based UTC time.
Accuracy of the calculations is affected by:
- time required to process the satellite information in the GPS HW
- time required to transfer the information over a HW link from the GPS HW to a mobile phone
- time required to receive the information by a Symbian OS drivers and decode by the AGPS
integration module
@param aSatInfo A satellite information with the GPS based UTC time
@param aTimeCorr A time correction that must be applied to the System UTC time. Not valid if the method returns an error.
@return KErrNone if sucedded.
KErrNotSupported if the satellite (GPS based UTC time) or the position
reception time is not present (0).
@see TPositionSatelliteInfo
@internalComponent
*/
TInt CAutoClockAdjust::CalculateTimeCorrection(const TPositionSatelliteInfo &aSatInfo, TTimeIntervalMicroSeconds &aTimeCorr)
{
LBSLOG(ELogP1, "CAutoClockAdjust::CalculateTimeCorrection()\n");
// The System UTC time when the location has been received from a GPS
TTime recTime;
// GPS based UTC time (satellite time)
TTime satTime;
TPosition pos;
TInt err = KErrNone;
aSatInfo.GetPosition(pos);
recTime = pos.Time();
satTime = aSatInfo.SatelliteTime();
if ((recTime == 0) || (satTime == 0))
{
err = KErrNotSupported;
}
else
{
aTimeCorr = satTime.MicroSecondsFrom(recTime);
}
return err;
}
/** Adjusts system time if required. The decision whether the adjustment is needed or not
is based on the following criterias:
- satellite time must be present in the location update
- time threshold must be exceeded
- time from a last adjustment is greater than a defined interval.
@param aStatus An error code.
@param TPositionSatelliteInfo Position and time information.
If clock adjustment takes place the TPosition::iTime is
re-set to the satellite time.
@see CLbsAdmin
@see TPositionSatelliteInfo
*/
void CAutoClockAdjust::LocationUpdate(TInt aStatus, TPositionSatelliteInfo& aPosInfo)
{
LBSLOG(ELogP1, "CAutoClockAdjust::LocationUpdate()\n");
TTimeIntervalMicroSeconds timeCorr;
TTime sysTime;
TInt err;
// If adjustment on, no error, and satellite information present
if ((iClockAdjustSetting == CLbsAdmin::EClockAdjustOn) && (aStatus == KErrNone) &&
((aPosInfo.PositionClassType() & EPositionSatelliteInfoClass) == EPositionSatelliteInfoClass))
{
// Is is time do do another time adjustment?
sysTime.UniversalTime();
if (Abs(sysTime.MicroSecondsFrom(iLastAdjustment).Int64()) > (1000*iAdjustInterval))
{
const TPositionSatelliteInfo& satInfo = static_cast<const TPositionSatelliteInfo&>(aPosInfo);
err = CalculateTimeCorrection(satInfo, timeCorr);
if (err == KErrNone)
{
// Is threshold exceeded?
if (Abs(timeCorr.Int64()) > (1000*iAdjustThreshold))
{
sysTime.UniversalTime();
sysTime += timeCorr;
LBSLOG(ELogP9, "->S CGpsSetClockBase::SetUTCTime() ClockModule\n");
LBSLOG5(ELogP9, " > TTime sysTime = %02d:%02d:%02d.%06d\n", sysTime.DateTime().Hour(),
sysTime.DateTime().Minute(),
sysTime.DateTime().Second(),
sysTime.DateTime().MicroSecond());
err = iSetClockImpl->SetUTCTime(sysTime);
LBSLOG2(ELogP9, " Return = %d\n", err);
if (err == KErrNone)
{
// Sync the position time with the satellite time
// to avoid re-adjusting the system time by the manual clock adjustment component.
TPosition pos;
aPosInfo.GetPosition(pos);
pos.SetTime(aPosInfo.SatelliteTime());
aPosInfo.SetPosition(pos);
LBSLOG2(ELogP2, "ACTION: Clock Adjusted by %ld\n", timeCorr.Int64());
}
}
if (err == KErrNone)
{
// Remember the current time even if threshold not exceeded
iLastAdjustment = sysTime;
}
else
{
LBSLOG_WARN2(ELogP3, "Clock Adjustment failed. Error: %d\n", err);
}
}
}
}
}
void CT_LbsClientPosTp2::CheckPositionSatelliteInfoL(TPositionSatelliteInfo& aSatelliteInfo)
{
CheckPositionCourseInfoL(aSatelliteInfo);
if((TUint)aSatelliteInfo.NumSatellitesUsed() != KNumberOfSatellitesUsed ||
aSatelliteInfo.SatelliteTime() != TTime(KSatelliteTime) ||
(TUint)aSatelliteInfo.NumSatellitesInView() != KNumberOfSatellitesInView ||
aSatelliteInfo.HorizontalDoP() != KHorizontalDoPValue ||
aSatelliteInfo.VerticalDoP() != KVerticalDoPValue ||
aSatelliteInfo.TimeDoP() != KTimeDoPValue)
{
_LIT(KErrBasicSat, "Basic satellite information not correct");
LogErrorAndLeaveL(KErrBasicSat);
}
TInt sats = aSatelliteInfo.NumSatellitesInView();
for (int i = 0; i < sats; i++)
{
TSatelliteData satelliteData;
TInt err = aSatelliteInfo.GetSatelliteData(i,satelliteData);
if (err != KErrNone)
{
_LIT(KErrGetSat, "Not possible to get satellite data, error code = %d");
TBuf<100> buf;
buf.Format(KErrGetSat, err);
LogErrorAndLeaveL(buf);
}
if ( (i%2) == 0 )
{
if( satelliteData.SatelliteId() != (KSatelliteId +i) ||
satelliteData.Azimuth() != KAzimuth ||
satelliteData.Elevation() != KElevation ||
satelliteData.IsUsed() != KIsUsed ||
satelliteData.SignalStrength() != KSignalStrength)
{
_LIT(KErrSatDataEven, "Incorrect satellite data on even satellites");
LogErrorAndLeaveL(KErrSatDataEven);
}
}
else
{
if( satelliteData.SatelliteId() != (KSatelliteId +i) ||
satelliteData.Azimuth() != KAzimuthOdd ||
satelliteData.Elevation() != KElevationOdd ||
satelliteData.IsUsed() != KIsUsedOdd ||
satelliteData.SignalStrength() != KSignalStrengthOdd)
{
_LIT(KErrSatDataOdd, "Incorrect satellite data on odd satellites");
LogErrorAndLeaveL(KErrSatDataOdd);
}
}
}
}
// ---------------------------------------------------------
// CPosPSYClearPositionDataTest::CheckSatelliteInfoClearsL
//
// (other items were commented in a header).
// ---------------------------------------------------------
//
void CPosPSYClearPositionDataTest::CheckSatelliteInfoClearsL()
{
TBool allIsCleared = ETrue;
TPositionSatelliteInfo* satInfo = static_cast<TPositionSatelliteInfo*> (iPosInfo);
if (satInfo->SatelliteTime() == KSatelliteTime)
{
_LIT(KError, "Satellite Time was not cleared for TPositionSatelliteInfo.");
AddTestResultL(KError, EErrorMessage);
allIsCleared = EFalse;
}
if (!Math::IsNaN(satInfo->HorizontalDoP()))
{
if (satInfo->HorizontalDoP() == KSatelliteHorizontalDoP)
{
_LIT(KError, "Horizontal DoP was not cleared for TPositionSatelliteInfo.");
AddTestResultL(KError, EErrorMessage);
allIsCleared = EFalse;
}
}
if (!Math::IsNaN(satInfo->VerticalDoP()))
{
if (satInfo->VerticalDoP() == KSatelliteVerticalDoP)
{
_LIT(KError, "Vertical DoP was not cleared for TPositionSatelliteInfo.");
AddTestResultL(KError, EErrorMessage);
allIsCleared = EFalse;
}
}
if (!Math::IsNaN(satInfo->TimeDoP()))
{
if (satInfo->TimeDoP() == KSatelliteTimeDoP)
{
_LIT(KError, "Time DoP was not cleared for TPositionSatelliteInfo.");
AddTestResultL(KError, EErrorMessage);
allIsCleared = EFalse;
}
}
TBool satelliteDataNotCleared = EFalse;
for (TInt i = 0; i < KSatelliteNumInView; i++)
{
TSatelliteData satellite;
TInt error = satInfo->GetSatelliteData(i, satellite);
if (error != KErrNotFound)
{
if (!Math::IsNaN(satellite.Azimuth()))
{
if (satellite.Azimuth() == KAzimuth)
{
satelliteDataNotCleared = ETrue;
}
}
if (!Math::IsNaN(satellite.Elevation()))
{
if (satellite.Elevation() == KElevation)
{
satelliteDataNotCleared = ETrue;
}
}
if (satellite.SatelliteId() == KSatelliteId ||
satellite.SignalStrength() == KSignalStrength)
{
satelliteDataNotCleared = ETrue;
}
}
}
if (satelliteDataNotCleared)
{
_LIT(KError, "Satellite Data was not cleared for all satellites in TPositionSatelliteInfo.");
AddTestResultL(KError, EErrorMessage);
allIsCleared = EFalse;
}
if (allIsCleared)
{
_LIT(KInfo, "All fields were cleared for TPositionSatelliteInfo.");
AddTestResultL(KInfo, EInfoMessage);
}
}