It can be but suffers from enough jitter to be unusable. All current BBB out of the box kernels have PPS-gpio. Google PPS gpio DTS bbb.
Enjoy :-) On Sunday, December 7, 2014, Chris Albertson <[email protected]> wrote: > On Sun, Dec 7, 2014 at 12:09 PM, folkert <[email protected] > <javascript:;>> wrote: > > > > > On my rpi the jitter is between 2 and 10us iirc but it is a while since > > I tested it. A quick peak shows me currently 3us jitter. Not bad for a > > userspace solution imho. > > > Really? The PPS to GPIO interface is handles in user space? It is not > interrupt driven? > In the implementations I've seen the critical real time work is done inside > the PPS interrupt handler and then of course ntpd runs in userland and can > take as much time as it needs > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > time-nuts mailing list -- [email protected] <javascript:;> > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ 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.
