[mc1322x] 6LowPAN data payload

[Jon Smirl]

On Wed, Jul 14, 2010 at 3:12 PM, Mariano Alvira <mar at devl.org> wrote:
> On Wed, Jul 14, 2010 at 11:01:26AM -0400, Mariano Alvira wrote:
>> On Wed, Jul 14, 2010 at 10:52:10AM -0400, Mariano Alvira wrote:
>>
>> I'm working on the slow ping times now --- there is a problem when the
>> radio goes from RX -> TX --- it looks like the first DMA transfer
>> needs a little time to finish (or something...)
>
> Hey everyone,
>
> I've just push two major changes.
>
> The first are two important performance enhancements to the tx_packet
> in the maca driver. Now tx_packet will force an interrupt if the maca
> is idle, causing an immediate transmission. And it will also advance
> the reception clock so that the current reception cycle will finish
> immediately or after the current packet is done being received. This
> also allows the reception cycle to be made much longer (since a
> transmit can preempt it now --- you can wait for packets as long as
> you want). This change has been pushed to libmc1322x and
> contiki-mc1322x.

Are you able to get AUTO mode working now?  I was never able to make it work.

>
> The second is a HUGE bugfix to contiki. Somehow a call to maca_on()
> made it's way into the prepare routine. maca_on() messes things up if
> you call it while the radio is doing stuff. Now you can safely disable
> BLOCKING_TX and enjoy super fast transmissions.
>
> Between econotags, a single packet ping is now 30ms (was 500ms!). And
> a 1200 byte ping (13 fragments, which should be the max) is now 337ms
> (before it wouldn't even work). Packet loss is greatly improved too on
> account of the long receive cycle. E.g. I can do this with 0% packet
> loss:
>
> ping6 -i .34 -s 1200 aaaa::250:c2ff:fea8:c3e2
>
> Chances are this will fix other things too, like some of the stability
> issues people were seeing.
>
> The econotag fragments will probably completely swamp Ravens now ---
> but these changes should make it easier to do a consistent interpacket
> delay.
>
> I haven't pushed these changes into Contiki CVS yet, but they will
> make it in there soon...
>
> Enjoy!
>
> -Mar.
>
>
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-- 
Jon Smirl
jonsmirl at gmail.com