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Re: gPTP and usb network device

Jukka Rissanen
 

Hi Chuck,

the gPTP is probably not a proper solution for this kind time sync as
it is normally meant to synchronize two devices with nanosecond
accuracy in industrial ethernet environments. The actual time value is
typically not that important in these TSN solutions, main thing is the
time synchronization between devices.

Have you considered using SNTP to synchronize the time, there is
already SNTP client supported in Zephyr? This has lower resolution but
it should be fine in normal applications.


Cheers,
Jukka

On Tue, 2018-10-16 at 12:09 -0700, cpmcparland@... wrote:
I'm setting up a IP link between a debian platform and a bluetooth
usb dongle running
zephyr. usb network device interface appears to work fine with the
zephyr IP stack running in
the dongle. I want the dongle zephyr os to be time sync'd with the
linux system and
am thinking gPTP would be a good way to achieve this.....particularly
because its been
implemented on zephyr. There's a note that zephyr gPTP only works on
boards that
have ethernet hardware links. Am wondering if anyone has tried using
gPTP with
usb networking enabled? Since the usb interface will likely run at
1Mb/s+ between
linux and zephyr (on dongle), I would expect it to behave reasonably
well - at least for
my application's timing requirements. Any experience or thoughts?

Regards,
Chuck McP
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