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: 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
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