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