[Tinyos-devel] Re: [Tinyos Core WG] time sync interfaces]

[Andreas Koepke]

For eyesIFX I use 32.768kHz and 32 bit width for over-the-air.
16 bit are not enough for e.g. preamble sampling type MACs with a
duty cycle in the permille area.

> Hi!
>
>> I expect that timesync protocol implementations in T2 (e.g. FTSP, RBS,
RITS) wouldn't wire the "standard precision" interfaces, but would work
directly with the arbitrary precision ones the radio stacks provide. I
would say that in 90% of the cases applications would wire the above
protocols instead of the low-level timestamping primitives. For the
remaining 10%, I don't think it's worth specifying a standard precision
for the HIL, either.
>
> No. The MAC in most cases will provide a SINGLE over the air precision.
How that is presented to the application developer (as a platform
sepcific precision or a standard one) is a different issue. I think for
now we can have this single patform dependent over the air precision (in
almost all cases 32khz) and have a standard PacketTimeSynch precision
(with 32khz). This way 90% of the applications can use the standard
interfaces, and would be completely shielded by changes in the MAC if
later we need to modify the over-the-air layout. Anyone how wants to
experiment with higher over-the-air precision now can rewire the MAC
layer and provide the native over-te-air precision PacketTimeSynch which
can be converted to the standard 32khz PacketTimeSynch with a simple
> wrapper.
>
> The applications need to be shileded, we need a standard interface that
MUST be provided by all platforms. The implementation details are
details.
>
> Miklos
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>