Hi! On Fri, 12 Dec 2008, Ramon Duato Navarro wrote:
Hi! Maybe someone can help me. I am working with TinyOs 2.1 and Micaz and want to understand the link layer without using Packet Link Layer.
The Packet Link is implemented in chips/cc2420/link. The retransmission are implemented in PacketLinkP.nc from that place.
I hope this helps. :-) Razvan ME
I am reading the CC2420Csma.nc CC2420TransmitP.nc file and I am getting a bit confused with the ACK's In CC2420TransmitP.nc, when you send a packet and receive an ACK then you call signalDone(SUCCESS); and the sendDone event is signalled with SUCCESS. But what happens when you don't receive the ACK?? As far as I have understood, you call call BackoffTimer.start( CC2420_ACK_WAIT_DELAY ) and when this Timer expires you call again signalDone(SUCCESS); (since we are in the ACK_WAIT state) So , there are no retransmissions and you do the same signalling as if you had received the ACK. Is that correct? Thanks in advance! Ramon.
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