i’ll take a look at it as soon as I get some free time ; I have a working, GPS master clock.
On Mon, Apr 24, 2023 at 6:45 AM Alan C. Assis <acas...@gmail.com> wrote: > Could be relevant to this thread: > https://github.com/apache/nuttx/pull/9084 > > On 1/30/23, Alan C. Assis <acas...@gmail.com> wrote: > > Hi James, > > > > Yes, Espressif is doing a good work adding support to it. > > > > I hope in the future others silicon vendors start to contribute as > > well (hello ST, Microchip, Renesas, ...) > > > > Very nice James, I think PTP will be very useful. > > > > Please let me know if you want some help with tests, etc. > > > > BR, > > > > Alan > > > > On 1/30/23, James Dougherty <jafr...@gmail.com> wrote: > >> wow, it is really well supported! > >> OK I will start looking at a PTP server implementation and work on > client > >> later… > >> > >>> On Jan 27, 2023, at 11:36 AM, James Dougherty <jafr...@gmail.com> > wrote: > >>> > >>> Thanks, I will try it this weekend on one of my boards…. > >>> > >>>> On Jan 27, 2023, at 11:12 AM, Alan C. Assis <acas...@gmail.com> > wrote: > >>>> > >>>> Yes, it is supported: serial and network (ethernet and WiFi). > >>>> > >>>>>> On 1/27/23, James Dougherty <jafr...@gmail.com> wrote: > >>>>> Outstanding! > >>>>> > >>>>> Serial and Network… > >>>>> > >>>>> Thank you > >>>>> > >>>>>>> On Jan 27, 2023, at 10:01 AM, Alan C. Assis <acas...@gmail.com> > >>>>>>> wrote: > >>>>>> > >>>>>> Hi James, > >>>>>> > >>>>>> ESP32 is supported, which features do you need? > >>>>>> > >>>>>> BR, > >>>>>> > >>>>>> Alan > >>>>>> > >>>>>>> On 1/27/23, James Dougherty <jafr...@gmail.com> wrote: > >>>>>>> I haven’t looked at it yet, but I am working on ESP32; is WROOM > >>>>>>> supported > >>>>>>> in master or just the S3/C3? > >>>>>>> > >>>>>>> > >>>>>>> On Fri, Jan 27, 2023 at 4:23 AM Robert Alexa > >>>>>>> <robertalexa2...@gmail.com> > >>>>>>> wrote: > >>>>>>> > >>>>>>>> Hi all, > >>>>>>>> > >>>>>>>> What's the current status of this? I'm also interested in adding > >>>>>>>> PTP > >>>>>>>> support to NuttX, especially on ESP32 if that's possible - I > >>>>>>>> haven't > >>>>>>>> done > >>>>>>>> any research yet regarding the hardware capabilities of ESP32 in > >>>>>>>> this > >>>>>>>> matter. > >>>>>>>> > >>>>>>>> As a first step I was thinking of adding support for the PTP > >>>>>>>> daemon, > >>>>>>>> as > >>>>>>>> Alan suggested. > >>>>>>>> > >>>>>>>> Regards > >>>>>>>> Robert > >>>>>>>> > >>>>>>>>> On Fri, 9 Dec 2022 at 07:39, James Dougherty <jafr...@gmail.com> > >>>>>>>>> wrote: > >>>>>>>> > >>>>>>>>> Thanks Arie, > >>>>>>>>> > >>>>>>>>> Yes, very true, it depends on your application! > >>>>>>>>> > >>>>>>>>> My statement about what makes a good clock is very subjective. > >>>>>>>>> This > >>>>>>>>> all depends on your application, your measurement and of course > >>>>>>>>> your > >>>>>>>>> jitter. > >>>>>>>>> > >>>>>>>>> - For Wireless AV, a 10ms gps clock is fine. > >>>>>>>>> - For Wireless Earbuds, a 10us clock is required with 1us phase > >>>>>>>>> max > >>>>>>>> drift. > >>>>>>>>> - For Photon measurements, you're in the nano/pico domain... > >>>>>>>>> > >>>>>>>>> Accuracy costs money, how well do you need to measure? > >>>>>>>>> > >>>>>>>>> So the message is to know your application! Your application will > >>>>>>>>> have > >>>>>>>>> varying time requirements. The infrastructure and machinery for > >>>>>>>>> relaying and exchanging time is all PTP provides as a tool. > >>>>>>>>> > >>>>>>>>> The 802.1AS spec specifies how to manage that clock across > >>>>>>>>> multiple > >>>>>>>>> time domains. > >>>>>>>>> > >>>>>>>>> Related, know your latencies! > >>>>>>>>> > >>>>>>>>> https://gist.github.com/jboner/2841832 > >>>>>>>>> > >>>>>>>>> Best regards > >>>>>>>>> -James > >>>>>>>>> > >>>>>>>>> > >>>>>>>>> > >>>>>>>>> On Thu, Dec 8, 2022 at 3:37 AM Arie de Muijnck <nu...@ademu.com> > >>>>>>>>> wrote: > >>>>>>>>> > >>>>>>>>>> Beware of that 1PPS signal. A few years ago I bought several GPS > >>>>>>>> modules > >>>>>>>>>> and compared the signals. Some differ by exactly 100ns (within > >>>>>>>>>> 2ns, > >>>>>>>>>> the > >>>>>>>>>> accuracy of my scope) from others, and that is not the width of > >>>>>>>>>> the > >>>>>>>>> pulse, > >>>>>>>>>> that is much wider, I compared only the edge that are comes > close > >>>>>>>>>> to > >>>>>>>> the > >>>>>>>>>> others. Maybe I will test again, have a 1 GHz LeCroy now, should > >>>>>>>>>> be > >>>>>>>> able > >>>>>>>>> to > >>>>>>>>>> do jitter measurements too. > >>>>>>>>>> Oh, and yes, before someone asks: all antenna and scope cables > >>>>>>>>>> were > >>>>>>>>>> the > >>>>>>>>>> same length... ;-) > >>>>>>>>>> > >>>>>>>>>> Arie > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> On 2022-12-08 06:33, James Dougherty wrote: > >>>>>>>>>>> Related to this, I have a GPS receiver generating PPS > interrupts > >>>>>>>>>>> on > >>>>>>>>>> SAME70. It would be a perfect GMC - Atomic clock sync! > >>>>>>>>>>> I will look at this when I get a chance. I have a lot of > >>>>>>>>>>> upstream > >>>>>>>>>> contributions from HW platforms I have done over the last 5 > years > >>>>>>>>>> or > >>>>>>>>>> so > >>>>>>>>>> with myself and others ... I need some time to > >>>>>>>>>>> patch master on upstream -- something for 2023 and now that > >>>>>>>>>>> NuttX > >>>>>>>>>>> has > >>>>>>>>>> graduated! Yay! > >>>>>>>>>>> > >>>>>>>>>> > >>>>>>>>> > >>>>>>>> > >>>>>>> > >>>>> > >> > > >
