Re: [gpsd-users] 1PPS not working with RPi 3 B+ and Stretch

[David J Taylor]

Chris,

Just a note, that following my own Web notes:

 https://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html

together with the updates further down the page, using a stock latest 
Raspbian on a 3B+, and both an Uputronics board and another GPS unit, NTP 
has worked correctly.

 https://www.satsignal.eu/mrtg/performance_raspi-18.php
 https://www.satsignal.eu/mrtg/performance_raspi-19.php

C:\Windows\System32>ntpq -crv -pn raspi-18
associd=0 status=01f8 leap_none, sync_pps, 15 events, no_sys_peer,
version="ntpd address@hidden Tue Mar 20 11:57:43 UTC 2018 (1)",
processor="armv7l", system="Linux/4.14.27-v7+", leap=00, stratum=1,
precision=-21, rootdelay=0.000, rootdisp=1.225, refid=kPPS,
reftime=deff4539.ff5f651b  Sun, Jul 22 2018 19:02:33.997,
clock=deff4549.363a4d7b  Sun, Jul 22 2018 19:02:49.211, peer=25812, tc=4,
mintc=3, offset=-0.001329, frequency=-9.561, sys_jitter=0.000477,
clk_jitter=0.001, clk_wander=0.000, tai=37, leapsec=201701010000,
expire=201712280000

    remote           refid      st t when poll reach   delay   offset 
jitter
==============================================================================
o127.127.22.0    .kPPS.           0 l   16   16  377    0.000   -0.001 
0.000
*192.168.0.20    .GPS.            1 u    1   32  377    2.609   -0.395 
0.224
+192.168.0.3     .kPPS.           1 u    6   32  377    2.715   -0.432 
0.312
+192.168.0.71    .kPPS.           1 u    -   32  377    2.761   -0.203 
0.687
uk.pool.ntp.org .POOL.          16 p    -   64    0    0.000    0.000 
0.000
-185.182.62.7    85.199.214.98    2 u   48   64  377   19.685    2.109 
2.096
-85.199.214.102  .GPS.            1 u   58   64  377   24.937    2.175 
1.857
-46.18.11.10     131.188.3.221    2 u   35   64  377   23.047    0.651 
3.119
-178.18.123.148  194.80.204.184   2 u   63   64  377   22.187    3.131 
3.829
-85.199.214.100  .GPS.            1 u    4   64  377   24.929    1.849 
4.341


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

address@hidden:~ $ cat /etc/ntp.conf
# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

driftfile /var/lib/ntp/ntp.drift

# Enable this if you want statistics to be logged.
statsdir /var/log/ntpstats/

statistics loopstats
filegen loopstats file loopstats type day enable

# filegen peerstats file peerstats type day enable
# filegen clockstats file clockstats type day enable

# This server for shared memory PPS source.

server 127.127.22.0 minpoll 4 maxpoll 4
fudge 127.127.22.0 refid kPPS

# You do need to talk to an NTP server or two (or three).

server 192.168.0.20 minpoll 5 maxpoll 5 iburst prefer   # LeoNTP
server 192.168.0.3  minpoll 5 maxpoll 5 iburst prefer   # Pixie
server 192.168.0.71 minpoll 5 maxpoll 5 iburst prefer   # RasPi-1 (LAN)

pool uk.pool.ntp.org minpoll 6 maxpoll 7 iburst

leapfile /home/pi/ntp/leap-seconds.file

# Suggestions for NTP restrictions:
restrict source notrap nomodify nopeer
restrict 127.0.0.1
restrict ::1
restrict 192.168.0.0 mask 255.255.255.0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Perhaps that helps?

Cheers,
David
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