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 <[email protected]> wrote: > On Mon, Oct 20, 2014 at 10:50 PM, Neil Schroeder <[email protected]> > 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 -- [email protected] > 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.
