On Thu, 6 Dec 2012, Stefan Tauner wrote:
> On Wed, 5 Dec 2012 10:35:31 -0500 (EST)
> Alan Stern wrote:
> > Your theory omits an important point: The host system generally doesn't
> > care exactly when frames start. Forcing it to keep track of these
> > events adds overhead.
>
> Yes, it does,
On Wed, 5 Dec 2012 10:35:31 -0500 (EST)
Alan Stern wrote:
> On Wed, 5 Dec 2012, Stefan Tauner wrote:
>
> > > Running NTP over a USB-based network link would certainly be the
> > > easiest solution, if your device can support it. Over the long run, it
> > > might even be more accurate on avera
On Thu, 6 Dec 2012 08:16:26 +0800
Xiaofan Chen wrote:
> Interestingly you mentioned this article. Back in 2008, we have
> some discussions about this topic in Microchip forum.
> http://www.microchip.com/forums/tm.aspx?m=329799
My favorite search engine told me about it of course while i did my
r
On Wed, Dec 5, 2012 at 8:58 AM, Stefan Tauner
wrote:
> On Tue, 4 Dec 2012 16:27:00 -0500 (EST)
> Alan Stern wrote:
>
>> I don't think referencing times to SOF packets is the best approach,
>> although it probably is the approach that would yield the most
>> precision. How precise do you want you
On Wed, 5 Dec 2012, Stefan Tauner wrote:
> > Running NTP over a USB-based network link would certainly be the
> > easiest solution, if your device can support it. Over the long run, it
> > might even be more accurate on average than using SOF packets.
>
> We are talking about microcontrollers
On Tue, 4 Dec 2012 16:27:00 -0500 (EST)
Alan Stern wrote:
> I don't think referencing times to SOF packets is the best approach,
> although it probably is the approach that would yield the most
> precision. How precise do you want your synchronization to be?
It should be below 1ms accuracy, b
On Tue, 4 Dec 2012, Stefan Tauner wrote:
> Hi!
>
> My broad goal is to transmit the current system time somewhat
> accurately to devices (namely fullspeed microcontrollers).
>
> I'd like to be able correlate some instant of a USB frame (i.e. a point
> in time with a known offset to the SOF) with
Hi!
My broad goal is to transmit the current system time somewhat
accurately to devices (namely fullspeed microcontrollers).
I'd like to be able correlate some instant of a USB frame (i.e. a point
in time with a known offset to the SOF) with the host's system time.
The host PC can then create a
