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Re: [gpsd-users] Set up for time sync and separate serial port use
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From: |
Pittman, Randall |
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Subject: |
Re: [gpsd-users] Set up for time sync and separate serial port use |
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Date: |
Fri, 10 Mar 2017 20:34:39 +0000 |
Also, I apologize for the dumb questions that I could probably answer
empirically. I'm flying blind at the moment--I cannot access the GPS hardware
again until next Tuesday, and need to get up and running by Wednesday!
-Randy
Randall Pittman
Faculty Research Assistant | School of Civil and Construction Engineering |
Oregon State University
Location: 006 Covell Hall | Mailing: 101 Kearney Hall | Corvallis, OR 97331-2132
Office: 541-737-2102 | Mobile: 541-286-7896
-----Original Message-----
From: gpsd-users [mailto:address@hidden On Behalf Of Gary E. Miller
Sent: Friday, March 10, 2017 10:04 AM
To: address@hidden
Subject: Re: [gpsd-users] Set up for time sync and separate serial port use
Yo Randall!
On Thu, 9 Mar 2017 18:04:18 +0000
"Pittman, Randall" <address@hidden> wrote:
> I have a python app that connects to my GPS Compass (Hemisphere Vector
> V103), sets it up to send certain messages, and then records the
> messages as they come in and parses them with the pynmea2 library.
You might consider adding that functionality to gpsd.
> However, I'd also like to sync the system clock (CentOS 7) with the
> 1PPS signal from the GPS. Here is how I'm considering doing this, but
> I have no idea if it will work:
Have you read the gpsd howtos? Like the time service howto?
> serial connection 38400 baud, GPZDA @ 20Hz, PASHR @ 20 Hz, GPGGA
> @ 20 Hz, GPROT @ 5 Hz from V103 with 1PPS
> __ on DCD line
> \ ________
> | /
> |==================================| USB-to-serial adapter >>
> | \\ \________ Used by Python app
> __/ \\
> \\
> \\
> \\ __
> \\ Tap RX line, /
> \\ Split off DCD line |
> \=======================| Serial port (ttyS0) >>
> | used by gpsd for time sync
> \__
>
> Will this work?
The problem is there is no way for gpsd to talk to the GPS. gpsd will
configure the GPS as it needs to be.
> What NMEA messages does gpsd need to work for time-sync? GPZDA only?
> My setup is currently outputting GPZDA at 20Hz
The minimal set of NMEA messages required is not a single unique set.
There are many ways to get the minimum. You will need the sats used (maybe
GPGSV and or GPGSA) and PVT data (maybe GPRMC).
> I guess an alternate approach could be to set up the message sending
> in my app and then is there any easy way to record all the message
> data with gpsd?
gpspipe -r
> Oregon State University Location
Stop by if you get to Bend.
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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