Hi folks,
I'm trying to change the CCA threshold of the CC2420 on a TelosB mote. The
way I change it is to write the RSSI.CCA_THR value by inserting the
following line, as denoted by >>, into the CC2420ControP.nc file:
async event void InterruptCCA.fired() {
...
call IOCFG1.write(0);
writeId();
>> call RSSI.write( 0xc0 << CC2420_RSSI_CCA_THR);
call CSN.set();
call CSN.clr();
//position 2
...
}
It seems that the position of the RSSI.write statement is critical. Putting
it earlier or later in the radio start process will corrupt the radio
startup process (and no startDone event will be generated). I understand
that RSSI write has to follow IOCFG1.write(0) since setting I0FG1 to 0
returns CCA pin to its normal state, but why will the radio start fail if I
put it to position 2? Thank you.
Best regards,
-- Wenjie Zeng
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