Thanks fellows for your useful inputs. Well apparently, I did dig deeper into the CC2420 datasheet and what I have decided to do is to use the CC2420 transmitter test modes i.e. TX_MODE = 3 (as given in CC2420 datasheet page 65). The idea to use a modulated signal and just send out the Synchronization header, I think that would be enough to raise the SDF interrupt at the receiver end.
Jonas, I am working on a time synchronization protocol according to which, on reception of an incoming pulse, the receiver has to reply in the same manner via a broadcast message. Now according to the default stack, as I mentioned above and you all know very well, that from the point of initiating a send signal to the point when it should be received, 10's of ms of delay is already experienced, now what I want to achieve is to reduce this delay between the send and receive, because according to my approach the smaller the time between send/rec the better the synchronization would be. Thanks! BR, Wasif On Fri, Feb 8, 2013 at 8:02 AM, janricliutinyos <tinyos.janric...@gmail.com>wrote: > **1. **By default, the CSMA is used. Therefore the transmission > costs more time due to the backoffs.**** > > **2. **The on air transmission time as well as the cc2420 buffer > writing time varies according to the packet size. A small size packet > requires a shorter period for transmission.**** > > ** ** > > You should read the CC2420TransmitP file, and do some test based on the > program given in the …/apps/ **** > > ** ** > > Janric Liu**** > > ** ** > > *From:* tinyos-help-boun...@millennium.berkeley.edu [mailto: > tinyos-help-boun...@millennium.berkeley.edu] *On Behalf Of *wasif masood > *Sent:* Thursday, February 07, 2013 11:03 PM > *To:* tinyos forum > *Subject:* [Tinyos-help] Time to transmit in CC2420!**** > > ** ** > > ** ** > > Hi All, > **** > > ** ** > > I know this is probably an old topic but I still couldn't find any > solution to that. Well, I am using CC2420Transmit.Send interface which is > connected to CC2420TransmitC. Even at this lowest level of wiring the > time elapsed between the Send and SendDone signal is in 10's of > milliseconds (I have tested it for both Z1 and TelosB). Is there any way I > can reduce this time? Please share your expertise!**** > > ** ** > > Regards, > Wasif Masood**** > -- Wasif Masood
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