Perhaps the programmable realtime unit (PRU) is what you're looking for. It's used in the 5370 CPU replacement.
-- Paul On Tue, Oct 21, 2014 at 8:33 AM, Neil Schroeder <gign...@gmail.com> wrote: > Andrew- > I'm actually referring to using either the eCAP function or one of the > integrated dmtimer triggers - which are, from some accounts, more accurate > than a gpio. > > Google beaglebone dmtimer pps. > > NS > > On Mon, Oct 20, 2014 at 11:56 PM, Andrew Rodland <and...@cleverdomain.org> > wrote: > >> On Mon, Oct 20, 2014 at 10:50 PM, Neil Schroeder <gign...@gmail.com> >> wrote: >> > The one thing that hasn't yet happened is making the beaglebone timestamp >> > on the linux side in a way that works for ntp. >> > >> > Custom code no problem. Freebsd PPSAPI no problem. Linux, nothing there >> > yet. >> > >> > I have been working on it but if anyone has some insight its appreciated. >> > >> >> It appears to support gpio class devices, with interrupts, so the >> pps-gpio driver (in-tree since 3.2) should work just fine. The only >> thing that's needed (other than building the driver) is a bit of code >> in the board support file to register the device. Various folks have >> done it for the rpi (http://ntpi.openchaos.org/pps_pi/ for example), >> and I've done it for the UDOO Dual >> (https://gist.github.com/arodland/518f037e4f24b1984286). The BBB is >> probably about as easy. >> >> I'm not sure if there's other hardware that lets you do better than >> grabbing an interrupt, but that will get you in the microsecond range >> or a bit better, anyhow. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.