That still doesn't help with seeing when the end of the packet has actually gone out.
On Wed, Feb 15, 2012 at 5:44 PM, Sergio Gonzalez <[email protected]> wrote: > Hi Ramakrishna, > > Before sending a packet, do: > > ... > call CC2420Config.setChannel(<channel>); // 11 or 26, etc. > call CC2420Config.sync(); > ... > > Then, send the packet inside the synchDone callback afterwards: > > // Called after radio has tuned into a new channel > event void CC2420Config.syncDone(error_t error) > { > if(error == SUCCESS) call AMSender.send(..); > ... > } > > > Sergio Gonzalez > > > > Hi , This is Ramakrishna, working on tinyos-2.1.1. I am experimenting on> > dynamic channel switching for telosb mote. I am trying to send 2 packets> one > in 26th channel and second in 11th channel. When i change the channel> from > 26 to 11 after sending the first packet in my program, first packet> also > being sent on 11th channel but not on 26th. why it is so? I am> modifying the > channel only after getting 'sendDone' event of the first> packet. how it is > overwriting the channel register with 11 before> transmitting the first > packet? Please help me in this regard.> > > It is my understanding that sendDone gets generated when the last byte has > been transfered to the h/w. It doesn't mean that the packet has acutally > transmitted. > > So if you are changing the channel at that point you will probably cause > problems for the back part of the packet. > > I'm not aware of an event being available from the h/w to indicate the > complete TX has finished. Not sure if current h/w makes that > available.... You will need to stare at the radio docs. > > > You could try putting a delay of somekind to see if that helps. > > As far as the channel register changing, I have no clue. > > > > -- > Eric B. Decker > Senior (over 50 :-) Researcher > > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > -- Eric B. Decker Senior (over 50 :-) Researcher
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