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! >>>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>> >>>
