"we need only microsecond accuracy" the Jetson board has SensorProcessingEnngine: "provide a built-in Cortex-R5 micro-controller within an always-on power domain also known as Sensor Processing Engine (SPE). Example uses include sensor data processing, wake up management, UAV, and robotics.
This source file will aid in the development of FreeRTOS-based firmware for SPE" from the SPE documentation On Wed, Jun 24, 2020 at 3:31 PM Richard Hill <plo...@gmx.de> wrote: > Some boards (but not yours) have PPS-in direct timestamping. Some iMX6s > have this. You’ll still need to mod the driver as it only handles PPS-out, > but > > it’s < 25ns accurate once running. > > > > There’s just far too much latency for PPS-in via GPIO to be useful. > > > > Richard H > > > > > > *From:* Andrey Volodin [mailto:andrevolo...@gmail.com] > *Sent:* Mittwoch, 24. Juni 2020 16:26 > *Cc:* linuxptp-users@lists.sourceforge.net > *Subject:* Re: [Linuxptp-users] Fwd: Fwd: adding precision with PPS with > PTP [linuxptp] on nvidia Jetson arm aarch64 device > > > > Dear Richard, > > Thank you for your response. > > How do we discipline the clocks to the global GPS time? using the software > time stamping from /dev/pps0? using linuxptp scenario defined previously? > > How to implement a better source for PTP GM? Do you have any exact > suggestions? > > Regards, > > Andrei > > > > On Wed, Jun 24, 2020 at 2:47 PM Richard Cochran <richardcoch...@gmail.com> > wrote: > > On Wed, Jun 24, 2020 at 12:48:45PM +0000, Andrey Volodin wrote: > > The initial host date/time in the example is set manually. > > probably /dev/pps0 can be used at the host side to set the time/date more > > accurately than using manual method defined above? so that the time > > sdynchronized with the dup will come from the GPS pps timepulse [ sourced > > in Ardusimple SimpleRT2K] ? > > So you want to discipline your two PHC clocks to the global GPS time? > > What are you trying to do? > > Remember that /dev/pps0 is using software time stamping, and as such > it makes a relatively poor source for a PTP GM. > > Thanks, > Richard > >
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