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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nitin Sharma Sent: Wednesday, April 02, 2008 5:57 PM To: tinyos-help@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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