> <mailto:
fros-02ecni/8Nmo@public.gmane.org>> wrote:
>
> Hi Vijay,
>
> We also used the TmoteSky for our experiments, and the mechanism
> required a few (uncommitted) changes to the CC2420 driver.
> The technique should be easy to port to any system:
>
> You are correct in that the CC2420 does not allow transferring data
> between the FIFOs, nor can the RX FIFO be transmitted directly,
> however,
> the technique evaluated in the paper does not use these features.
> Instead if immediately forwarding incoming data, the approach employs
> pre-copying of already received data. Hence, on a forwarding node, an
> outgoing packet is triggered by an incoming packet, *but does not
> contain the same data*. The outgoing packet contains the data of the
> previous incoming packet.
>
> I believe some packet radios, such as the Chipcon CC2430, support
> transmitting directly from the "RX FIFO". Using such a radio
> reduces the
> advantages of the pre-copying approach, but would be comparable to
> decreasing the SPI communication overhead.
>
> Regards,
> Fredrik Österlind
>
> Vijay Gabale wrote:
> > Hi there,
> >
> > I greatly "appreciated Approaching the maximum 802.15.4 multi-hop
> > throughput" zero copy mechanism.I have been trying to dig out how to
> > implement this mechanism on Tmote sky platform (MSP430 + CC2420
> radio)
> > using TinyOS. I observed following
> >
> > 1) No command is available on the part of CC2420 to transmit data
> > directly from RX fifo to TX fifo, thus avoiding unnecessary copying.
> > If you want to do this with current design, the data has to go all
> > over through processor memory.
> > 2) STXON command can only transmit data from transmit fifo i.e. data
> > in TX fifo specific location of RAM. There is no command to transmit
> > data from RX fifo directly.
> >
> > I would be highly obliged if you could convey how you
> implemented the
> > mechanism using CC2420 radio only in Contiki esp. the features of
> > CC2420 that you have utilized.
> >
> > Eagerly awaiting your early response.
> >
> > Thanks in advance.
> >
> > Regards,
> > Vijay Gabale
> > Senior graduate student
> > IIT Bombay, India.
> >
http://www.cse.iitb.ac.in/~vijaygabale
> <
http://www.cse.iitb.ac.in/%7Evijaygabale>
> > <
http://www.cse.iitb.ac.in/%7Evijaygabale>
> >
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