[Tinyos-help] CC2420 LQI in TinyOS 2.0

[Paul Chiang]

Hi,

 

I have noticed that in TinyOS 2.0 the CC2420 LQI seems to be a function of
RSSI. More specifically, LQI seems to be calculated from RSSI as follows:

LQI = RSSI>0 ? RSSI : 128 + RSSI

This does not match the information given in the CC2420 datasheet where it
states that the range of LQI is 50~110, not to mention that the two values
should have been calculated using different methods in the first place.

I am calling CC2420ActiveMessageC's CC2420Packet interface for the LQI and
RSSI values. I wonder if I am doing anything wrong or if in TinyOS 2.0 LQI
is not being read from the CC2420 register?

 

TIA,

Paul Chiang

 

P.S. I am using MicaZ and TmoteSky motes.

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