On Sat, 2 Jan 2016 11:47:09 -0000 "David J Taylor" <[email protected]> wrote:
> I'm also using PPS with the BBB - you even commented on my Web page! > > http://www.satsignal.eu/ntp/BBB-vs-RPi.html Yes, I know. But I didn't mention your webpage, because there is something weird going on with your system. The jitter you are seeing is very high. And it depends on the load of the OS that seems to have many unnecessary processes running. Even if you don't use the timer unit, like Dan Drown did, you shouldn't see a jitter higher than 2-4us on the PPS pin (that's approximately half the interrupt latency of the BBB including kernel/software induced latency). But yours goes up to +/-12us, ie is 6-12 times higher. Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
