... I mean, since before transmitting there are 2 different modes, based on the measured cca value, I think it's possible to get the actual value of the incoming signal power, even not during a reception. In that case which command should I use to get the rssi?
On 6/19/07, roberto pagliari <[EMAIL PROTECTED]> wrote:
I'm wondering to know if it is possible to measure the RSSI value whenever I want, I mean, not necessary during the reception of a packet, but everytime, for some reasons due to my specific applications... thank you On 6/19/07, Tsung-Han Lin <[EMAIL PROTECTED]> wrote: > > It's over the first 8 symbols. The built-in RSSI is always averaged over > 8 symbol period (Page 49). > > -Han > > Aleksandr N. Sadkov : > > Thanks for reply :) > > > > But I have one more question, > > Looking through CC2420 datasheet we can see: > > "The length will be 8 bytes, RSSI will contain the average RSSI level > during > > receiving of the packet and FCS/corr contain information of FCS check > result > > and the correlation levels." Page 33 > > And on the other hand, we see: > > "The first FCS byte is replaced by the 8-bit RSSI value. This RSSI > value is > > measured over the first 8 symbols following the SFD." Page 38 > > > > What actually RSSI we measured? Averaged over the first 8 symbols or > over > > the full packet? > > > > Regards, Aleksandr. > > > > > > > > wbr, Sadkov Aleksandr > > [EMAIL PROTECTED] > > www.sumkino.com > > www.wl.unn.ru > >> -----Original Message----- > >> From: Philip Levis [mailto: [EMAIL PROTECTED] > >> Sent: Monday, June 18, 2007 9:42 PM > >> To: Tsung-Han Lin > >> Cc: Aleksandr N. Sadkov; tinyos-help@Millennium.Berkeley.EDU > >> Subject: Re: [Tinyos-help] RSSI measuring > >> > >> On Jun 18, 2007, at 6:05 AM, Tsung-Han Lin wrote: > >> > >>> According to the datasheet, "the RSSI_VALID status bit indicates > >>> when the RSSI value is valid, meaning that the receiver has been > >>> enabled for at least 8 symbol periods." Since receiving a packet > >>> will always be longer than 8 symbol periods, there's no need to > >>> check. I think this register should be checked when you're using > >>> CC2420 to sample background noise. > >> > >> Right. The RSSI_VALID bit is there for sampling when the radio is in > >> TX mode or before it's had a chance to generate a sample. > >> > >> Phil > > > > _______________________________________________ > > Tinyos-help mailing list > > Tinyos-help@Millennium.Berkeley.EDU > > > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@Millennium.Berkeley.EDU > > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >
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