I noticed that, but this recalibration seems to happen also after receiving/listening..isn'it? Can I consider it as a tx<->rx transition? Just some minute ago I noticed that the 3 phase last about 840 us..what is that? Is the tx->rx transition (840us) longer than the rx->tx one (140 us)? And phase 4? What does it represent? Is it the backoff? My estimations for min-max values are correct..?
--- Gio 28/8/08, Sarfraz Nawaz <[EMAIL PROTECTED]> ha scritto: > Da: Sarfraz Nawaz <[EMAIL PROTECTED]> > Oggetto: Re: [Tinyos-help] cc2420 LPL broadcasting > A: [EMAIL PROTECTED] > Cc: "Tinyos" <[email protected]> > Data: Giovedì 28 agosto 2008, 16:44 > 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 > > __________________________________________________ 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
