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Posted to dev@nuttx.apache.org by Robert Alexa <ro...@gmail.com> on 2023/01/27 12:22:56 UTC
Re: NuttX PTP Support
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 <ja...@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!
> > >
> >
>
Re: NuttX PTP Support
Posted by Nathan Hartman <ha...@gmail.com>.
On Fri, Jan 27, 2023 at 7:23 AM Robert Alexa <ro...@gmail.com> wrote:
> As a first step I was thinking of adding support for the PTP daemon, as
> Alan suggested.
That is probably the most important step right now. Hardware support
can be added as needed.
The TM4C129 Tiva-C ARM platform has hardware support for PTP on chips
that have the built-in MAC & PHY and I have wanted to take advantage
of that but there hasn't been a good starting point available and it
hasn't gotten high enough on my list of priorities yet. If this
feature starts to get some attention, I'll try to make it work on TM4C
as well...
Cheers,
Nathan
Re: NuttX PTP Support
Posted by James Dougherty <ja...@gmail.com>.
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 <ac...@gmail.com> wrote:
> Could be relevant to this thread:
> https://github.com/apache/nuttx/pull/9084
>
> On 1/30/23, Alan C. Assis <ac...@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 <ja...@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 <ja...@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 <ac...@gmail.com>
> wrote:
> >>>>
> >>>> Yes, it is supported: serial and network (ethernet and WiFi).
> >>>>
> >>>>>> On 1/27/23, James Dougherty <ja...@gmail.com> wrote:
> >>>>> Outstanding!
> >>>>>
> >>>>> Serial and Network…
> >>>>>
> >>>>> Thank you
> >>>>>
> >>>>>>> On Jan 27, 2023, at 10:01 AM, Alan C. Assis <ac...@gmail.com>
> >>>>>>> wrote:
> >>>>>>
> >>>>>> Hi James,
> >>>>>>
> >>>>>> ESP32 is supported, which features do you need?
> >>>>>>
> >>>>>> BR,
> >>>>>>
> >>>>>> Alan
> >>>>>>
> >>>>>>> On 1/27/23, James Dougherty <ja...@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
> >>>>>>> <ro...@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 <ja...@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!
> >>>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>>
> >>
> >
>
Re: NuttX PTP Support
Posted by "Alan C. Assis" <ac...@gmail.com>.
Could be relevant to this thread: https://github.com/apache/nuttx/pull/9084
On 1/30/23, Alan C. Assis <ac...@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 <ja...@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 <ja...@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 <ac...@gmail.com> wrote:
>>>>
>>>> Yes, it is supported: serial and network (ethernet and WiFi).
>>>>
>>>>>> On 1/27/23, James Dougherty <ja...@gmail.com> wrote:
>>>>> Outstanding!
>>>>>
>>>>> Serial and Network…
>>>>>
>>>>> Thank you
>>>>>
>>>>>>> On Jan 27, 2023, at 10:01 AM, Alan C. Assis <ac...@gmail.com>
>>>>>>> wrote:
>>>>>>
>>>>>> Hi James,
>>>>>>
>>>>>> ESP32 is supported, which features do you need?
>>>>>>
>>>>>> BR,
>>>>>>
>>>>>> Alan
>>>>>>
>>>>>>> On 1/27/23, James Dougherty <ja...@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
>>>>>>> <ro...@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 <ja...@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!
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>
>>
>
Re: NuttX PTP Support
Posted by "Alan C. Assis" <ac...@gmail.com>.
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 <ja...@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 <ja...@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 <ac...@gmail.com> wrote:
>>>
>>> Yes, it is supported: serial and network (ethernet and WiFi).
>>>
>>>>> On 1/27/23, James Dougherty <ja...@gmail.com> wrote:
>>>> Outstanding!
>>>>
>>>> Serial and Network…
>>>>
>>>> Thank you
>>>>
>>>>>> On Jan 27, 2023, at 10:01 AM, Alan C. Assis <ac...@gmail.com>
>>>>>> wrote:
>>>>>
>>>>> Hi James,
>>>>>
>>>>> ESP32 is supported, which features do you need?
>>>>>
>>>>> BR,
>>>>>
>>>>> Alan
>>>>>
>>>>>> On 1/27/23, James Dougherty <ja...@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
>>>>>> <ro...@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 <ja...@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!
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>
>
Re: NuttX PTP Support
Posted by James Dougherty <ja...@gmail.com>.
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 <ja...@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 <ac...@gmail.com> wrote:
>>
>> Yes, it is supported: serial and network (ethernet and WiFi).
>>
>>>> On 1/27/23, James Dougherty <ja...@gmail.com> wrote:
>>> Outstanding!
>>>
>>> Serial and Network…
>>>
>>> Thank you
>>>
>>>>> On Jan 27, 2023, at 10:01 AM, Alan C. Assis <ac...@gmail.com> wrote:
>>>>
>>>> Hi James,
>>>>
>>>> ESP32 is supported, which features do you need?
>>>>
>>>> BR,
>>>>
>>>> Alan
>>>>
>>>>> On 1/27/23, James Dougherty <ja...@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 <ro...@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 <ja...@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!
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>
Re: NuttX PTP Support
Posted by James Dougherty <ja...@gmail.com>.
Thanks, I will try it this weekend on one of my boards….
> On Jan 27, 2023, at 11:12 AM, Alan C. Assis <ac...@gmail.com> wrote:
>
> Yes, it is supported: serial and network (ethernet and WiFi).
>
>> On 1/27/23, James Dougherty <ja...@gmail.com> wrote:
>> Outstanding!
>>
>> Serial and Network…
>>
>> Thank you
>>
>>>> On Jan 27, 2023, at 10:01 AM, Alan C. Assis <ac...@gmail.com> wrote:
>>>
>>> Hi James,
>>>
>>> ESP32 is supported, which features do you need?
>>>
>>> BR,
>>>
>>> Alan
>>>
>>>> On 1/27/23, James Dougherty <ja...@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 <ro...@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 <ja...@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!
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>
Re: NuttX PTP Support
Posted by "Alan C. Assis" <ac...@gmail.com>.
Yes, it is supported: serial and network (ethernet and WiFi).
On 1/27/23, James Dougherty <ja...@gmail.com> wrote:
> Outstanding!
>
> Serial and Network…
>
> Thank you
>
>> On Jan 27, 2023, at 10:01 AM, Alan C. Assis <ac...@gmail.com> wrote:
>>
>> Hi James,
>>
>> ESP32 is supported, which features do you need?
>>
>> BR,
>>
>> Alan
>>
>>> On 1/27/23, James Dougherty <ja...@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 <ro...@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 <ja...@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!
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>
Re: NuttX PTP Support
Posted by James Dougherty <ja...@gmail.com>.
Outstanding!
Serial and Network…
Thank you
> On Jan 27, 2023, at 10:01 AM, Alan C. Assis <ac...@gmail.com> wrote:
>
> Hi James,
>
> ESP32 is supported, which features do you need?
>
> BR,
>
> Alan
>
>> On 1/27/23, James Dougherty <ja...@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 <ro...@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 <ja...@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!
>>>>>>
>>>>>
>>>>
>>>
>>
Re: NuttX PTP Support
Posted by "Alan C. Assis" <ac...@gmail.com>.
Hi James,
ESP32 is supported, which features do you need?
BR,
Alan
On 1/27/23, James Dougherty <ja...@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 <ro...@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 <ja...@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!
>> > > >
>> > >
>> >
>>
>
Re: NuttX PTP Support
Posted by James Dougherty <ja...@gmail.com>.
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 <ro...@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 <ja...@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!
> > > >
> > >
> >
>