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