There is a state diagram on page 45 of cc2420 datasheet which might be helpful. After the transmission is complete, it goes into a state where the oscillator is calibrated again.
On Thu, Aug 28, 2008 at 8:13 PM, Flavio Pompermaier <[EMAIL PROTECTED]> wrote: > cc2420 broadcast transmission has a periodic waveform like this (leaving out > non-periodic phases such as radio initialization or DELAY_AFTER_RECEIVE > listening): > > 2 3 4 5 > | | |____| | > 1 | | /| |\ | 1 .... > ____| | / | | \|____ > |\|/ | | > | | | | | | > > If I understood correctly and supposing that the message to broadcast is 24 > bytes long (i.e., 24+11 (MAC header)+2 (CRC)-->37 bytes-->74 symbols. Being 2 > symbols sent in 1 jiffy then the tx of the message should theoretically take > 1.13 ms): > > 1) is the transmission of the message (oscilloscope duration: 1.4 ms. Almost > equal to the expected value) > 2) After transmission cc2420 drops its current consumption for 140 us. > Probably it corresponds to the tx/rx transition. Am I right? > 3 and 4)Total duration is about 2.120 ms. What do they represent? Are they > backoff + cca??? > 5) 140 us. Probably it corresponds to the rx/tx transition. > > Am I correct? If so, can I consider tx<->rx transition to last 140 us? > And what represent phases 3 and 4? And what is the backoff range (in ms)? > Is it correct to consider min backoff = 10 jiffies and max 50 jiffies (min > 0.305 ms and max 1.5 ms)? And waht is the duration of CCA? > > Best regards, > FP > > __________________________________________________ > Do You Yahoo!? > Poco spazio e tanto spam? Yahoo! Mail ti protegge dallo spam e ti da tanto > spazio gratuito per i tuoi file e i messaggi > http://mail.yahoo.it > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
