thanks for your suggestion, Kim. What kind of values are you getting? Juan.
On Wed, Jul 29, 2015, at 07:41 PM, Yursen Kim wrote: > 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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