Hi Guys Thank you to your assistance . Seems is working now . I see that NMEA chosen as PPS peer server :
remote refid st t when poll reach delay offset jitter ============================================================================== oGPS_NMEA(0) .GPS. 0 l 12 16 377 0.010 -0.030 0.031. But please clarify the following : 1) Can I sure that is update the system clock in PPS resolution 2) Why I still doesn't see PPSFREQ,PPSTIME,PPSSIGNAL , when I run ntptime . My output is following : ntptime ntp_gettime() returns code 0 (OK) time d6e78fed.18c23fa0 Thu, Apr 3 2014 7:44:45.096, (.096714581), maximum error 3888 us, estimated error 474 us, TAI offset 0 ntp_adjtime() returns code 0 (OK) modes 0x0 (), offset 50.880 us, frequency -26.830 ppm, interval 1 s, maximum error 3888 us, estimated error 474 us, status 0x2001 (PLL,NANO), time constant 4, precision 0.001 us, tolerance 500 ppm. root@am335x-evm:/var/lib/ntp# ntpq -c as ind assid status conf reach auth condition last_event cnt =========================================================== 1 65397 976a yes yes none pps.peer sys_peer 6 root@am335x-evm:/var/lib/ntp# ntpq -c "rv 65397" associd=65397 status=976a conf, reach, sel_pps.peer, 6 events, sys_peer, srcadr=GPS_NMEA(0), srcport=123, dstadr=127.0.0.1, dstport=123, leap=00, stratum=0, precision=-20, rootdelay=0.000, rootdisp=0.000, refid=GPS, reftime=d6e79065.fffb1778 Thu, Apr 3 2014 7:46:45.999, rec=d6e79066.73ee526e Thu, Apr 3 2014 7:46:46.452, reach=377, unreach=0, hmode=3, pmode=4, hpoll=4, ppoll=4, headway=0, flash=00 ok, keyid=0, offset=0.054, delay=0.000, dispersion=0.262, jitter=0.031, filtdelay= 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00, filtoffset= 0.05 0.06 0.06 0.06 0.07 0.06 0.07 0.05, filtdisp= 0.03 0.27 0.51 0.75 0.99 1.23 1.47 1.71 3) Since I can attach only one GPS to the board ntp.conf is following : tos orphan 6 driftfile /var/lib/ntp/ntp.drift server 127.127.20.0 minpoll 4 iburst #NMEA Server fudge 127.127.20.0 flag1 1 flag2 0 time2 0.500 Regards Arthur -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of David Lord Sent: Wednesday, April 02, 2014 11:25 PM To: [email protected] Subject: Re: [ntp:questions] PPS problem David Lord wrote: ..... > I currently use a "Sure" gps, ntp-dev-4.2.7p433 on NetBSD-6 > > I have a few significant differences in my ntp.conf > > ################# > tos orphan 10 A few more comments tos orphan 10 # is to replace your three lines: server 127.127.1.0 #lo server fudge 127.127.1.0 stratum 7 restrict 127.127.1.0 noquery nomodify notrap > tos mindist 0.4 # allows pps to kick in > ^^^^^^^^^^^ > server 127.127.20.2 mode 18 You can use this as prefer peer: server 127.127.20.0 prefer > fudge 127.127.20.2 stratum 7 time2 0.407 flag1 0 refid GPSb Required value for time2 will depend on your GPS model and firmware version. > server 127.127.22.2 minpoll 4 maxpoll 4 server 127.127.22.2 flag2 0 > flag3 1 refid PPSb server -4 <ntp0.mydomain> server -4 <ntp1.myisp> > minpoll 8 maxpoll 10 iburst prefer For what it's worth the last entry in my /var/log/ntp-stat.20140402: Wed Apr 2 17:36:00 GMT 2014 remote refid st t poll reach delay offset jitter ============================================================ -GPS_NMEA(2) .GPSb. 7 l 64 377 0.000 -1.940 8.828 oPPS(2) .PPSb. 0 l 16 377 0.000 0.000 0.004 +ns0.lordyne 81.187 3 u 64 377 1.363 -0.175 0.202 ns2.lordyne 192.16 2 u 64 377 0.498 -0.237 0.613 +ns1.lordyne 81.187 3 u 64 377 0.577 0.007 0.703 +ns3.lordyne 81.187 3 u 64 377 0.849 -0.486 0.690 *ntp1.xxxxxx 195.66 2 u 256 377 19.589 -0.943 0.403 associd=0 status=011d leap_none, sync_pps, 1 event, kern, pll offset: -0.000317 pll frequency: -35.8115 maximum error: 0.406 estimated error: 3e-06 kernel status: pll ppsfreq ppstime ppssignal nano pll time constant: 4 precision: 1e-06 frequency tolerance: 495.911 pps frequency: -35.8115 pps stability: 0.00480652 pps jitter: 0.002 calibration interval 256 calibration cycles: 6087 jitter exceeded: 7635 stability exceeded: 0 calibration errors: 20 ntp_adjtime() returns code 0 (OK) modes 0x0 (), offset -0.317 us, frequency -35.812 ppm, interval 256 s, maximum error 406000 us, estimated error 3 us, status 0x2107 (PLL,PPSFREQ,PPSTIME,PPSSIGNAL,NANO), time constant 4, precision 0.001 us, tolerance 496 ppm, pps frequency -35.812 ppm, stability 0.005 ppm, jitter 1.500 us, intervals 6087, jitter exceeded 7635, stability exceeded 0, errors 20. David _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
