Hi!
On Wed, 20 Jan 2010, Wenjie Zeng wrote:
> Hi,
>
> I read in the RI-MAC paper that by preloading the message into the TXFIFO
> buffer, we can accelerate the Send.send process. I am assuming that
> somewhere down the radio stack, we need to copy a message_t structure, which
> is somewhat time-consuming, rather than simply copying copying message_t*
> pointer along. Is this true?
No. :-) To send a packet using CC2420 the packet first needs to be loaded
in the TXFIFO, and then a STXON or STXONCCA strobe command needs to be
issued. The send strobe can be issued much later than the actual loading.
> I asked because, through tracing into the CC2420 radio stack, I see nothing
> beyond pointer copies. I am trying to push the limit of the efficiency of my
> protocol, so if such preloading can be done, could someone please tell me
> which file I should look at? Thank you.
>
I think the place you need to look is CC2420TransmitP.nc from
tos/chips/cc2420/transmit.
I highly recommend the CC2420 datasheet:
http://focus.ti.com/lit/ds/symlink/cc2420.pdf
--
Razvan ME
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