Re: GPS drivers (was Re: [PATCH v2 0/9] Serial slave device bus)
From: Pavel Machek
Date: Fri Jan 27 2017 - 15:23:50 EST
On Fri 2017-01-20 18:16:11, Andy Shevchenko wrote:
> On Fri, 2017-01-20 at 16:26 +0100, Linus Walleij wrote:
> > > Now, NMEA knows about some of the complexity (not AGPS), but gets
> > > the
> > > details wrong. In particular, it would be good to have error
> > > estimates
> > > and velocities from the same moment you get position estimates.
> > NMEA if it is this:
> > https://en.wikipedia.org/wiki/NMEA_0183
> > Seems to be a high-level format such as XML or CSV or any other
> > $FAVOURITE_ASCII_TRANSPORT format.
> Not exactly. It depends on device settings.
> Old GPS I used to play with have AT command to switch between ASCII and
> binary format. Some of the devices might use non-standard binary
> protocols (however, representable as NMEA), etc.
Apparently NMEA has some serious limitations. gpsd authors have some
good docs about that.
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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