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