Re: [gpsd-dev] Fw: [gpsd-commit-watch] [SCM] GPSD branch, master, updated. dev-3.19a-435-g7fc42e4

[Gary E. Miller]

Yo Fred!

On Thu, 28 Mar 2019 13:48:22 -0700 (PDT)
Fred Wright <address@hidden> wrote:

> On Thu, 28 Mar 2019, Gary E. Miller wrote:
> 
> > Thanks for the ubxtool patches!  As you correctly note, it is a very
> > young tool.  Many things were just thrown together and could be much
> > improved.  More to come when I get a u-blox 9.
> >
> > One comment:
> >
> >    Note that the baud rate is only applicable to the UART port, so
> >    there's no point in applying this to the -S option.
> >
> > Newer u-blox may have two serial ports.  So in some cases it would
> > need to apply to the -S as well.  
> 
> I considered that possibility, but as yet there's no readily
> available documentation covering such receivers.  In particular, if
> any protocol documentation for the 9 series exists at all, it's not
> published on their website.
It is part of the 5 series.  Documented here:

u-blox5_Protocol_Specifications\(GPS.G5-X-07036\).pdf 

It is part of the 9 series.  Documented here:

ZED-F9P_IntegrationManual_\(UBX-18010802\).pdf 

> I wouldn't be surprised if port ID 2 is for a second UART port, but
> it's not yet documented.  It would be easy enough to add that.

You are correct.

> I sometimes see "reserved" values in the USB port which look
> suspiciously like the flags and baud rate for a UART port.  I suspect
> that this is due to GPSD itself indiscriminately setting them.  It's
> technically illegal to send nonzero values for reserved fields, but
> what the receiver appears to do in this case is just set and echo the
> values, while probably completely ignoring them internally.  This is
> one of a few "not new" GPSD UBX-related bugs that I'll probably look
> at after chasing the new bug I reported earlier.

Crn you cite where reserved must be zero for ubx?  I can not find a
general statement of that.  Feel free to dig into that mess.

I have lots of samples where u-blox set "reserved" data fields.

I think what u-center does is read the existing value, and mask in the
changes.  A PITA to do.  The new 9 series does away with that mess.

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

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