[Tinyos Core WG] Meeting: 21.iii.2007

[David Moss]

Not going to be able to make it today - I have another conference call with
some customers at the same time.  

CC2420 SPI:
* Removed the watchdog timer from TransmitP, which I think was responsible
for shutting off the SPI bus in the middle of Tx.
* Have yet to see the SPI bus issues reoccur, but further testing is
required to verify.

TEP105
* Kevin has the latest revision

CC2420 2.0.1 stack:
* Spent some time on the 2.0.1 stack over the past week ironing things out
* Will do a full regression test soon.
* Added in a secondary low power listening strategy to the CC2420 stack:
  > This LPL strategy mimics the send and receive behavior of the TinyOS 1.x
CC1000 stack.
  > Does not use acknowledgements, backoffs, or CCA in the middle of
delivery (after the first message secures the channel)
  > CCA receive checks are extremely short when compared to the other LPL
strategy that uses acknowledgements - about 100 times shorter.
  > The transmission does not get cut short like the original strategy - it
lasts the length of a full receive check.
  > This strategy makes sense for some networks types and densities; the
other strategy makes sense for other networks.
  > Developers can define some preprocessor variable to select which LPL
strategy to use in the CC2420 stack.


MessageTransport:
 - This should actually be "MessageLink" - it does not fulfill Layer 4
functionality, it fulfills Layer 2 functionality.  My nomenclature in
calling it "Transport" was incorrect.
 - Having it available as an optional layer in the CC2420 stack makes sense
because of the way the DSN byte is not changed when using it to deliver a
message reliably from point to point.
- We should discuss including this layer in the CC2420 stack when we're all
available to talk

-David



-----Original Message-----
From: tinyos-2.0wg-bounces at Mail.Millennium.Berkeley.EDU
[mailto:tinyos-2.0wg-bounces at Mail.Millennium.Berkeley.EDU] On Behalf Of
Philip Levis
Sent: Tuesday, March 20, 2007 11:51 PM
To: TinyOS Core WG
Subject: [Tinyos Core WG] Meeting: 21.iii.2007

Wednesday, March 21, 2007, 09:30 AM US Pacific Time
Bridge: 4
Passcode: 4758934

Numbers:
US: 1-916-356-2663 or 1-888-875-9370 (non-Intel)
UK: +44 1793 402663
Denmark: +45 4527 5090

Agenda:

Status
   - CC2420 SPI
   - Telos power draw/MSP430 pins
   - Power management results (SOSP)
TEP 116 (attached)
   - cancel
TinyOS 2.0.1
   - Feature list
   - Live CD
   - TTX4
   - Roadmap
Radio power control (TEP 105)
SIDs/Button

Phil