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] <javascript:> > 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 the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/17bf44ef-d7ab-4edd-97de-31da244d82b5o%40googlegroups.com.
