I have added to the cc2420 driver in tinyos-2.x to set the CCA
threshold to an arbitrary value of my choosing (CCA_THR field of the
RSSI register as the cc2420 datasheet calls it). I know what I am
succeeding in setting it, because I can read it back from the RSSI
register itself. However, it does not seem to have any effect on the
radios operation, as a test I set the cca threshold to -128, so it
would be impossible for the cca check to pass on an STXONCCA strobe
(the rssi value cannot be lower than this, being a signed 8-bit
integer).

However, packets still get sent... am I missing something here? Has
anyone had any experience doing this kind of thing?


Alan Medlar
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