[Tinyos-help] Receive Indicator

[David Moss]

The indicators in the CC2420 stack are used for low power listening
strategies.  In this case, the byte indicator is high when the radio is
receiving bytes, and low when the radio is not receiving bytes: it follows
the SFD line exactly, and produces the same result whether you're
transmitting or receiving.  There is another physical indicator,
EnergyIndicator, and a link level indicator, PacketIndicator available in
the CC2420 stack.  I think the EnergyIndicator is the only one being used
right now.  No documentation exists, this is purely for development and
experimentation.

 

-David

 

 

  _____  

From: tinyos-help-bounces at millennium.berkeley.edu
[mailto:tinyos-help-bounces at millennium.berkeley.edu] On Behalf Of Nitin
Sharma
Sent: Wednesday, April 02, 2008 5:57 PM
To: tinyos-help at millennium.berkeley.edu
Subject: [Tinyos-help] Receive Indicator

 

I was reading through when i got stuck in this. 

 /** Byte reception/transmission indicator */
  bool sfdHigh;

ByteIndicator returns sfdHigh ?

CC2420TransmitC 
                ByteIndicator.isReceiving( ) , what does it return on
reception and what on transmission? (Sorry , couldn't find the
documentation)

CC2420ReceiveC 
               PacketIndicator.isReceiving( ) 

Whats the difference on Receive Detection using above i.e  Reception from
TransmitC or Reception from ReceiveC ( More generally, byte / packet )

Thanks.
Nitin Sharma 

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