Recently I want to use the interface CC2420Packet to set transmission power.
By using the command setPower. I am now working at Tinyos 2.1.2.
However, I encounter this error:
RadioCountToLedsC.nc: In function `changepower':
RadioCountToLedsC.nc:139: CC2420Packet.setPower not connected
In
how to sample the channel power when no node is transmitting?
the example in tinyos tutorial only the sampling under the transmission
power.
as shown in http://tinyos.stanford.edu/tinyos-wiki/index.php/Rssi_Demo
However, as the application that is mentioned in above website:
*"Another usage
Thanks very much, I have tried to output the timestamp using hex and just
shorten the output length, reformat the output format to
"cca,sfd,timestamp", and the results are fine.
1,0,aca7.
0,0,acac.
1,0,acb4.
0,1,acb6.
1,0,acbe.
1,0,acbf.
1,0,acc5.
1,0,acca.
0,1,acd0.
1,0,acd8.
1,0,acdb.
1,0,acdc.
Currently, I am intending to record the cca and sfd value using a timer.
Due to the high frequency sampling rate (5ms/ sample), the output of the
printf would flush themselves like follows:
[26804][26820]cca:1, sfd:0.
[26823][26831]cca:1, sfd:0.
[26834]cca:1, sfd:0.
[26841]cca:1, [26847]cca:0,
Thanks,
I have figured it out.
The reason is that I edited the source file in another editor, while the
compiled source file is not changed. = =
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View this message in context:
In general, the path ETX is calculated as (1/first_link(P)+ ...
+1/last_link(P) ), along with the each link.
However, intuitively, the ETX of a path P should have this form
"1/first_link(P)*...*last_link(P).
why it is actually an additive metric rather than multplicative one?
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