[Tinyos-help] Why plus 0x7f when read rssi in CC2420ControlP.nc?

Nick2010 tinyos2010 at gmail.com
Sat Apr 17 18:21:48 PDT 2010

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Content preview:  In module CC2420ControlP, I found this: 395 event void RssiResource.granted()
   { 396 uint16_t data; 397 call CSN.clr(); 398 call RSSI.read(&data); 399 call
   CSN.set(); 400 401 call RssiResource.release(); *402 data += 0x7f;* 403 data
   &= 0x00ff; 404 signal ReadRssi.readDone(SUCCESS, data); 405 } [...] 

Content analysis details:   (4.0 points, 3.3 required)

 pts rule name              description
---- ---------------------- --------------------------------------------------
 3.2 FH_DATE_PAST_20XX      The date is grossly in the future.
 0.0 BAYES_50               BODY: Bayesian spam probability is 40 to 60%
                            [score: 0.4955]
 1.1 DNS_FROM_OPENWHOIS     RBL: Envelope sender listed in bl.open-whois.org.
-0.3 AWL                    AWL: From: address is in the auto white-list

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