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; [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
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