Difference between revisions of "NTP"

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(Created page with "==Get current Time from Internet== <pre class="apf"> </pre> ==Time synchronisation from GPS== * You will need the "real" NTP daemon, not the Busybox one. * Config file (''/e...")
 
(Get current Time from Internet)
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==Get current Time from Internet==
 
==Get current Time from Internet==
 
<pre class="apf">
 
<pre class="apf">
 
+
# ntpd -nqp 217.147.208.1
 
</pre>
 
</pre>
  

Revision as of 14:42, 19 September 2016

Get current Time from Internet

# ntpd -nqp 217.147.208.1

Time synchronisation from GPS

  • You will need the "real" NTP daemon, not the Busybox one.
  • Config file (/etc/ntpd.conf):
# Allow only time queries, at a limited rate, sending KoD when in excess.
# Allow all local queries (IPv4, IPv6)
restrict default nomodify nopeer noquery limited kod
restrict 127.0.0.1
restrict [::1]

server 127.127.20.0 mode 17 minpoll 4 maxpoll 4 prefer
fudge 127.127.20.0 flag3 1 flag2 0 flag1 1 time1 0.0

  • 127.127.20.0 means: "use /dev/gps0 and parse it as NMEA to get time" (See [1]).
  • mode 17 is for 9600 bauds GPS providing GPRMC frames
  • To create /dev/gpsX (GPS is connected to UART2):
# ln -sf /dev/ttymxc1 /dev/gps0
  • To launch ntpd:
# /usr/sbin/ntpd -g -c /etc/ntp.conf

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