GPS data from gllin

[Andrew Turner]

I believe there is the possibility that GeoClue will be ported to
OpenMoko. This would provide a simple DBUS interface to "location" and
developers wouldn't have to care if the location was provided by GPS,
WiFi, Plazes, user entered, or whatever.

http://www.freedesktop.org/wiki/Software/GeoClue


On 8/6/07, Jonathon Suggs <jsuggs at murmp.com> wrote:
> Ken Yale wrote:
> > Hello,
> >
> > The GLLIN sends NMEA sentences to named pipe  "/tmp/nmeaNP".
> > The OMGUI uses this output to plot positions, satellite strength, etc.
> > on various OMGUI test panels.
> > Close your handle to /tmp/nmeaNP to stop the GLLIN (if it was opened
> > with "-np" option).
> >
> > Below is a typical NMEA output sequence from the GTA01 showing the
> > position (RMC,GGA), time (UTC format)  (RMC,GGA), satellites used (GSA),
> > satellites tracked (GSV), satellite signal strength (GSV), and satellite
> > position (GSV), type of fix (GSA), and various other details (GGA
> > especially has lots of miscellaneous information).
> >
> > Google "NMEA" and you'll find excellent tutorials about NMEA.  (Be sure
> > not to type too fast and end up with "NEMA" which, among other things,
> > is a medical-imaging file exchange standard.)
> >
> > $GPGGA,230648.00,3716.309458,N,12156.790892,W,1,07,0.5,040.0,M,-0.537000
> > ,M,0.0130515,0130*7C
> > $GPRMC,230648.00,A,3716.309458,N,12156.790892,W,005.9,188.0,060607,,,A*4
> > 1
> > $GPGSV,2,1,08,23,69,004,37,20,52,174,44,25,49,260,44,13,46,314,30*70
> > $GPGSV,2,2,08,16,42,064,35,04,14,292,34,01,12,096,30,27,25,250,16*77
> > $GPGSA,A,3,01,04,13,16,20,23,25,,,,,,1.1,0.5,1.0*32
> > $GPGGA,230649.00,3716.307825,N,12156.791167,W,1,07,0.5,040.0,M,-0.537000
> > ,M,0.0130515,0130*77
> > $GPRMC,230649.00,A,3716.307825,N,12156.791167,W,006.1,188.0,060607,,,A*4
> > 1
> > $GPGSV,2,1,08,23,69,004,35,20,52,174,43,25,49,260,43,13,46,314,28*7B
> > $GPGSV,2,2,08,16,42,064,35,04,14,292,34,01,12,096,28,27,25,250,27*7C
> > $GPGSA,A,3,01,04,13,16,20,23,25,,,,,,1.1,0.5,1.0*32
> >
> > The OpenMoko team will plug the GLLIN into the GPSD (see module
> > omgui/gllin.cpp for sample GLLIN start/stop code to use as the basis for
> > the GPSD).   I hear the DBUS link planned for GPS information
> > distribution beyond the GPSD multi-cast is done.
> >
> > TTFN
> > Ken Yale
> Thanks for the info, I'm looking into the gpds documentation right now.
> I'm somewhat familiar with DBUS, but will need to get my hands dirty
> with it before I feel truly comfortable.  Any DBUS and/or GPS gurus out
> there?
>
> I know possibly premature, but what would be the "correct" way to get
> gps information?
>
> You can get the raw output like is demonstrated in the wiki
> http://wiki.openmoko.org/wiki/GPS
>
> Or you could call d-bus methods (ie turnOn, turnOff, curPosition,
> curElevation, curSpeed, etc).  Do we have any idea what that address
> would be and/or has anyone worked on those interfaces/methods?
>
> I would think something like the dbus interface could make for "cleaner"
> more (re)usable code, plus you could hide some of the underlying
> complexities in the gpsd setup.
>
>


-- 
Andrew Turner
ajturner at highearthorbit.com      42.2774N x 83.7611W
http://highearthorbit.com              Ann Arbor, Michigan, USA
Introduction to Neogeography - http://oreilly.com/catalog/neogeography