We implemented PPS output signal through AM335x Dual-Mode Timer running in the PWM mode with SCLK frequency.
This is more accurate than software GPIO output because the CPTS on the AM335x can generate hardware timestamp event on the rising edge of the DMTimer, making it possible to synchronize PPS with the CPTS internal clock counter. 2015-07-29 20:08 GMT+03:00 Chris Healy <cphe...@gmail.com>: > The Freescale MX6 based Sabre boards are inexpensive and have good PTP > support now, don't they? IIRC, recently there was some changes made to > support the HW 1588 block in the MAC that allows the HW to drive a 1588 > output pin correctly. > > I have not tested this myself yet though but will be doing so in the near > future as I'm working on a design that will depend on it.... ;-) > > On Wed, Jul 29, 2015 at 9:17 AM, Richard Cochran <richardcoch...@gmail.com > > wrote: > >> On Wed, Jul 29, 2015 at 05:28:12PM +0200, Juan Solano wrote: >> > Oops! time to ditch the BBB then. I have written a PPS generator driver >> > through GPIO: >> > >> > https://github.com/jsln/pps-gen-gpio >> >> Right, so the jitter you are seeing is mostly due to latencies in the >> OS. You can improve this a bit by using a PREEMPT_RT kernel. >> >> > Do you know of a cheap SBC we can use that supports HW timestamp? Has >> > anybody had success with Atmel SAMA5D3 chips? >> >> I can't think of any cheap SBC that also has good PTP support. >> >> Sorry, >> Richard >> >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> Linuxptp-devel mailing list >> Linuxptp-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/linuxptp-devel >> > > > > ------------------------------------------------------------------------------ > > _______________________________________________ > Linuxptp-devel mailing list > Linuxptp-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linuxptp-devel > >
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