Hi
Murray, Ben wrote:
Hi
Am I correct in thinking your tinyos-2.x-contrib/ethz/snpk/tos/chips/cc2420/
setup is basically keeping a table of neighbour wake-up times for more
efficient unicasts rather than trying to align their wake-up times?
yes, this is correct
I have been looking at the /ethz/snpk contrib, and also found
ethz\snpk\tos\lib\net\TimeSync which looks like it's trying to align clocks
(or at least the mote's view of a global clock) although it appears to
expect the nodes being physically arranged by ID? Sort of similar to FTSP
approach?
i think you are right (i don't know every detail about this
implementation). in the current state, information propagates in
ascending node id order. this was done for testing reasons, and since
then, we didn't change this code.
Cheers
Roman
Regards,
Ben
-----Original Message-----
From: Roman Lim [mailto:[EMAIL PROTECTED]
Sent: 20 February 2008 09:58
To: Murray, Ben
Cc: [email protected]; 'Brian Jump'
Subject: Re: [Tinyos-help] LPL syncronization
the sensor network platform kit (SNPK) has a synchronous LPL
implementation for CC2420.
you can download it at
http://tinyos.cvs.sourceforge.net/tinyos/tinyos-2.x-contrib/et
hz/snpk/tos/chips/cc2420/
it is based on the most recent tos2 cc2420 radio stack
its actually developed for tmotes, micaz is not tested.
roman
Murray, Ben wrote:
as far as I am aware LPL is asynchronous. The TEP is here:
http://www.tinyos.net/tinyos-2.x/doc/html/tep105.html
and tutorials are here:
http://www.tinyos.net/tinyos-2.x/doc/html/tutorial/
I have, however, read in the contrib about "synchronous"
LPL (rincon)
http://docs.tinyos.net/index.php/TinyOS_2.x_index_of_contribut
ed_code#Rincon
_Enhanced_CC2420_Radio_Stack
...it appears to use a system of recording neighbour-schedules and times
its
preambles such that they start just before it thinks the intended
recipient
is to wake up, thus reducing the length of the preamble required
(recipients
can ACK a unicast to stop the senders preamble continuing longer than
necessary).
If you find anything else useful wrt LPL-style synchronous stuff please
share!
Cheers
-Ben
I have recently started working with TinyOS on the micaZ motes. I am
trying to implement the Low Power Listening that comes with
TinyOS. I
just have a few questions on how it works. What is the best way to
determine the duty cycle for the LPL. How do the motes stay
synchronized?
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