Re: [gpsd-dev] ✘NMEA_MAX

[Gary E. Miller]

Yo Eric!

On Mon, 28 Mar 2016 20:38:52 -0400
"Eric S. Raymond" <address@hidden> wrote:

> Gary E. Miller <address@hidden>:
> > The board also puts NMEA and RTCM on different serial ports.  So
> > I'll have to learn how gpsd does RTCM and then get this
> > implementation supported.  
> 
> Shouldn't be a big deal.  The way I set things up, RTCM2 and RTCM3 are
> just additional packet types that the packet sniffer can recognize
> (though it took some contortions to make this work for RTCM2 because
> it's bit-stream with 30-bit words, not byte-oriented - you have to
> run a separate state machine to sync to the packet boundaries).

Luckily this GPS is RTCM 3 and 3.1

> So, basically, you can plug in both ports and GPS should figure out
> which is NMEA and which is RTCM2 on its own.  At worst, you might
> have to tell the RTCM2 port the baud rate with stty, but pribably you
> won't need to do that.

Cool.  It also looks like I'll need to send some config string to enable
the RTCM output from the base GPS.

And in another twist.  cm accuracy mean lat/lon use 7 digits after the
deciaml point, not 6.  I'll dive in to find where that is getting
truncated.  With luck it will not break too many regressions...

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

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