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; [email protected] > 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 [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
