[Thumbgps-devel] navisys GR-601W gps on FreeBSD/NTP

[Ron Frazier (NTP)]

Hi Jim,

I may or may not be able to help. I have successfully run PPS before through a USB - Serial converter using windows. I have not done it with Linux, BSD, etc. I am currently running PPS through a serial connection on Ubuntu Linux. What are the server lines in your ntp.conf? Are you running GPSD? For what it's worth, the USB signal comes into Linux on my system as /dev/ttyUSB0. When I was running NTP without GPSD in Windows, I had to make a symbolic link and map that to /dev/gps1 or something. I don't remember exactly. I was not running PPS then though, and I was not running GPSD in Windows. (You can't.)

Where ever the USB signal is coming in, if it's like Linux, you should be able to do the following to see the NMEA data:

cat /dev/ttyUSB0

Press CTRL-C to stop.

By the way, are the new GPS units with the PPS mod for sale anywhere yet? I wouldn't mind getting my hands on one.

Sincerely,

Ron


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Ron Frazier
timekeepingdude AT techstarship.com

Jim Thompson <jim at netgate.com> wrote:


after a long night of hacking, here is the result of about a 5 minute run on FreeBSD 8.3 (a pfSense 2.1 beta that was handy) running on a PC Engines Alix 3d2 board with
the Navisys GR-601W plugged in via USB

[2.1-BETA0][root at pfsense-beta.netgate.com]/dev(655): ntpdc -c kern
pll offset: 0.0131656 s
pll frequency: 25.385 ppm
maximum error: 0.025897 s
estimated error: 0.006287 s
status: 2001 pll nano
pll time constant: 4
precision: 1e-09 s
frequency tolerance: 496 ppm
pps frequency: 24.724 ppm
pps stability: 0.000 ppm
pps jitter: 0 s
calibration interval: 4 s
calibration cycles: 0
jitter exceeded: 0
stability exceeded: 0
calibration errors: 0
[2.1-BETA0][root at pfsense-beta.netgate.com]/dev(656): ntpdc -c "clockstat 127.127.20.0"
clock address: 127.127.20.0
clock type: Generic NMEA GPS Receiver (20)
last event: 0
current status: 0
number of polls: 21
no response to poll: 0
bad format responses: 0
bad data responses: 0
running time: 338
fudge time 1: 0.155000
fudge time 2: 0.000000
stratum: 0
reference ID: GPS
fudge flags: 0x5
[2.1-BETA0][root at pfsense-beta.netgate.com]/dev(657): ntpdc -c dm
remote local st poll reach delay offset disp
_____________________________________________

*GPS_NMEA(0) 127.0.0.1 0 16 377 0.00000 0.018658 0.02373
LOCAL(0) 127.0.0.1 10 64 77 0.00000 0.000000 0.43401
.clock.isc.org 192.168.3.166 1 64 77 0.05998 0.045383 0.43512
.199.4.29.166 192.168.3.166 2 64 77 0.04831 0.026922 0.06511
[2.1-BETA0][root at pfsense-beta.netgate.com]/dev(658): ntpq -p
remote refid st t when poll reach delay offset jitter
_____________________________________________

*GPS_NMEA(0) .GPS. 0 l 3 16 377 0.000 17.541 4.836
LOCAL(0) .LOCL. 10 l 43 64 77 0.000 0.000 0.004
+199.4.29.166 64.90.182.55 2 u 39 64 77 48.317 26.922 19.527
+clock.isc.org .GPS. 1 u 37 64 77 59.994 45.383 10.124
[2.1-BETA0][root at pfsense-beta.netgate.com]/dev(659): 

and after 10 minutes:

[2.1-BETA0][root at pfsense-beta.netgate.com]/dev(668): ntpdc -c "clockstat 127.127.20.0"
clock address: 127.127.20.0
clock type: Generic NMEA GPS Receiver (20)
last event: 0
current status: 0
number of polls: 42
no response to poll: 0
bad format responses: 0
bad data responses: 0
running time: 681
fudge time 1: 0.155000
fudge time 2: 0.000000
stratum: 0
reference ID: GPS
fudge flags: 0x5
[2.1-BETA0][root at pfsense-beta.netgate.com]/dev(669): ntpdc -c dm
remote local st poll reach delay offset disp
_____________________________________________

*GPS_NMEA(0) 127.0.0.1 0 16 377 0.00000 0.026902 0.02632
LOCAL(0) 127.0.0.1 10 64 377 0.00000 0.000000 0.03052
.clock.isc.org 192.168.3.166 1 64 377 0.05960 0.065447 0.03905
.199.4.29.166 192.168.3.166 2 64 377 0.04929 0.070362 0.05154
[2.1-BETA0][root at pfsense-beta.netgate.com]/dev(670): ntpq -p
remote refid st t when poll reach delay offset jitter
_____________________________________________

*GPS_NMEA(0) .GPS. 0 l 2 16 377 0.000 14.092 10.630
LOCAL(0) .LOCL. 10 l 46 64 377 0.000 0.000 0.004
+199.4.29.166 64.90.182.55 2 u 40 64 377 49.289 70.362 10.886
+clock.isc.org .GPS. 1 u 39 64 377 59.612 65.447 10.469


Note that PPS is not working 
[2.1-BETA0][root at pfsense-beta.netgate.com]/dev(659): tail /var/log/ntpd.log 
3 Jun 09:03:07 ntpd[61833]: synchronized to 199.4.29.166, stratum 2
3 Jun 09:03:07 ntpd[61833]: kernel time sync status change 2001
3 Jun 09:03:20 ntpd[61833]: refclock_nmea: time_pps_getcap failed: Inappropriate ioctl for device
3 Jun 09:03:23 ntpd[61833]: refclock_nmea: time_pps_getcap failed: Inappropriate ioctl for device
3 Jun 09:03:23 ntpd[61833]: refclock_nmea: time_pps_getcap failed: Inappropriate ioctl for device
3 Jun 09:03:25 ntpd[61833]: refclock_nmea: time_pps_getcap failed: Inappropriate ioctl for device
3 Jun 09:03:46 ntpd[61833]: synchronized to GPS_NMEA(0), stratum 0
3 Jun 09:03:50 ntpd[61833]: refclock_nmea: time_pps_getcap failed: Inappropriate ioctl for device
3 Jun 09:04:14 ntpd[61833]: refclock_nmea: time_pps_getcap failed: Inappropriate ioctl for device
3 Jun 09:08:34 ntpd[61833]: refclock_nmea: time_pps_getcap failed: Inappropriate ioctl for device

Will investigate.

Jim

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--

Sent from my Android Acer A500 tablet with bluetooth keyboard and K-9 Mail.
Please excuse my potential brevity.

(To whom it may concern.  My email address has changed.  Replying to former
messages prior to 03/31/12 with my personal address will go to the wrong
address.  Please send all personal correspondence to the new address.)

(PS - If you email me and don't get a quick response, don't be concerned.
I get about 300 emails per day from alternate energy mailing lists and such.
I don't always see new email messages very quickly.  If you need a reply and
haven't heard from me in 1 - 2 weeks, send your message again.)

Ron Frazier
timekeepingdude AT techstarship.com