[hafqa] [hafqa] [Bug 2877] Incorrect GPS timestamps reported over D-BUS

Wed Feb 6 10:39:10 EET 2008

https://bugs.maemo.org/show_bug.cgi?id=2877

------- Comment #13 from jukka.rissanen at nokia.com  2008-02-06 10:39 GMT+3 -------
(In reply to comment #11)
> Is it possible that bad data is fed to the chip via gps_last_saved_report? This
> file is generated by gpsd and most likely stores the incorrect timestamp.
> 
> I would think that gps_last_saved_report is involved in GPS startup. 

No, the gps_last_saved_report just contains the latest report + some other
stuff and it is used to show the info in "GPS location details" window if the
gpsd is not running. Its contents is not fed to internal chip.

> Otherwise,
> how would the chip know the last location? If last location is not used, this
> would imply that GPS5300 ignores almanac data and could explain the poor
> performance we've being seeing.

No, almanac and ephemeris are fed back to the chip. But if they are too old,
then the system needs to download them from satellite and if there is an error
during this download you will see delayed fixes etc, see
http://en.wikipedia.org/wiki/Gps#Navigation_signals for more details.

> 
> Are you also the maintainer for gpsdriver? I would really like to ask some
> questions about it. Any chance Nokia could opensource it?

No, I am not the gpsdriver maintainer.

Opensourcing the gpsdriver is currently not possible because of proprietary TI
messages used when communicating with the chip.

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