[Tinyos-devel] Copying directly from RxFIFO to TxFIFO of CC2420

[Sagar Bijwe]

No. I have already been through that paper. That paper talks about packet
pre-copying which actually puts the packet into transmission buffer, in
advance. This pkt is then transmitted when another packet is received by
just sending a signal. Note that bringing pkt to msp is inevitable here. The
idea is similar. But if a pkt comes just check its header if it's intended
for the node otherwise relay it. So we just need to copy header to msp. I
want to get rid of other unnecessary data copying. I think you got my point.
One of my colleague is already in touch with the author of the paper.

-Sagar Bijwe
MyResearch <http://sag.bijwe.googlepages.com/mtp>

On Thu, Aug 14, 2008 at 2:45 AM, Razvan Musaloiu-E. <razvanm at cs.jhu.edu>wrote:

> Hi!
>
> On Thu, 14 Aug 2008, Sagar Bijwe wrote:
>
>  I should have elaborated more. I just needed to know whether there exists
>> a
>> control command (i could not find in CC2420 datasheet)  to transfer data
>> directly from rxbuffer to txbuffer. I don't want to use any external kit
>> for
>> the purpose of programming CC2420. Driver level modifications can be
>> handled
>> once i know that such a command exists. According to current
>> implemenation,
>> we have to first copy pkt from rxbuffer to msp & then to txbuffer (this
>> makes spi bus bottleneck). I want to remove this critical path. Thanks for
>> your response anyway.
>>
>
> If this is what you want to do then you'll probably find relevant this
> paper:
>        http://www.sics.se/~adam/osterlind08approaching.pdf<http://www.sics.se/%7Eadam/osterlind08approaching.pdf>
>
> All the best!
> Razvan ME
>
>  On Thu, Aug 14, 2008 at 2:04 AM, Eric Decker <cire831 at gmail.com> wrote:
>>
>>  How are you going to do that without programming the CC2420?
>>> There has to be somekind of control signalling which has to touch the
>>> CC2420.
>>> And there are state implications as well.
>>>
>>> It has to hook through the driver.  Starting with the CC2420 driver will
>>> be
>>> necessary.
>>>
>>> eric
>>>
>>>
>>> On Wed, Aug 13, 2008 at 12:39 PM, Sagar Bijwe <sag.bijwe at gmail.com>
>>> wrote:
>>>
>>>  Is there a way to copy directly from RxFIFO of CC2420 to TxFIFO?
>>>> I'm looking for the improved pkt forwarding without programming CC2420
>>>> itself.
>>>>
>>>>
>>>> - Sagar Bijwe <http://sag.bijwe.googlepages.com/home.html>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
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