It may depend on how your system is configured but look in: /var/log/messages and /var/log/syslog The “app” (daemon) responsible to sync is running as ntpd, every reboot will force a sync with your pi. So the obvious way is to check the date after reboot. If it is correct, it means it sync’ed fine. You can also check the journal with journalctl -u ntpd -n500 and look through the log. The ntp query (ntpq) shows that your BBG is aware of the pi time server.
Franck Rougier From: "[email protected]" <[email protected]> on behalf of "[email protected]" <[email protected]> Reply-To: "[email protected]" <[email protected]> Date: Thursday, July 2, 2020 at 4:04 PM To: BeagleBoard <[email protected]> Subject: [beagleboard] Re: Setting system time and data frequently (offline, with LCM) Thanks. Fulfilling this by configuring ntp.conf sounds quite diable. I followed some instructions online but failed. Here is what in BBG's ntp.conf and Pi's ntp.conf. I use 192.168.0.102 to ssh into pi and 192.168.4.2 to ssh into BBG. Part of ntp.conf in BBG: # pool.ntp.org maps to about 1000 low-stratum NTP servers. Your server will # pick a different set every time it starts up. Please consider joining the # pool: <http://www.pool.ntp.org/join.html> server 192.168.0.102 Part of ntp.conf in Pi: # By default, exchange time with everybody, but don't allow configuration. restrict -4 default kod notrap nomodify nopeer noquery limited restrict -6 default kod notrap nomodify nopeer noquery limited restrict 192.168.4.0 mask 255.255.255.0 nomodify notrap And here is the result for ntpq -p on BBG. I don't know how to check if BBG is really trying to make time sync. debian@beaglebone:~$ sudo ntpq -p remote refid st t when poll reach delay offset jitter ============================================================================== 192.168.0.102 .XFAC. 16 u 58 64 0 0.000 0.000 0.000 在 2020年7月2日星期四 UTC-4下午4:11:07，[email protected]写道： Setup NTP server on the pi. The BBB should have the ntpd (NTP daemon) already setup. Change the ntp configuration to point to the IP of your pi. Let ntp maintain the time by itself no need for cron. Any scripts or custom implementation will had a delay which will increase the time drift between your systems. To maintain the clock between reboots or when the pi is unavailable, purchase an i2c real time clock like the DS1307 and use ntp to keep the time sync'ed. I hope this helps. On Thursday, July 2, 2020 at 9:27:23 AM UTC-7, [email protected] wrote: Yeah, GGB has its own power supply. And I am connecting raspberry pi and BBG through ethernet. For transmitting the message, it is done by LCM. I think LCM is faster because at least there's no password issue and I hope to let the BBG time sync quite often(like every 1 min), but not too often because that would be unnecessary. What I now have is a program(c or python) that can get the time sending by a raspberry pi. Now I plan to read the output and set the time using think command: date -s "2 OCT 2006 18:00:00" in the shell script. But I don't know how to do that. 在 2020年7月2日星期四 UTC-4上午11:03:20，Dennis Bieber写道： On Wed, 1 Jul 2020 22:45:25 -0700 (PDT), in gmane.comp.hardware.beagleboard.user [email protected] wrote: >Hi, > >I am doing a project using both beaglebone and raspberry pi. Now only the >pi has internet connection and I have to sync their time. Currently I can >send the pi's time to beaglebone green every second, but I don't know how >to use this data to set the system time on Beaglebone. I plan to write a >shell script so it can be running all the time from boot. Anyone knows how >to do that? Thanks. > "Information... We want... Information" How is the BBG connected to the R-Pi for this transfer? If the R-Pi is sending time data, there has to be something on the BBG that is reading it. It would probably be easier to have the BBG /ask/ the R-Pi for the time, and that could be done using a cron job on the BBG. Of course, that means now the R-Pi has to have running process to accept the requests... It all comes down to how the two devices are communicating. If the BBG is connected to the R-Pi via USB (hope you are using an external power supply on the BBG -- don't think an R-Pi USB can provide the power draw) you might just need to configure the R-Pi as a gateway, and let the BBG NTP (or whatever recent Debian/systemd sets up) do normal time sync through the R-Pi's network connection (or run a tier 3 NTP server on the R-Pi and let the BBG time sync to it). -- Dennis L Bieber -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to a topic in the Google Groups "BeagleBoard" group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/beagleboard/uLb8KWACeYo/unsubscribe. To unsubscribe from this group and all its topics, send an email to [email protected]<mailto:[email protected]>. 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