[Tinyos-help] Disable backoff CC2420 tmote sky

[Gaurav Chhawchharia]

Hi Bhavish,

Thanks a lot.
It has been of a great help in my work too.

Gaurav.

On Mon, Apr 7, 2008 at 7:03 AM, Bhavish Aggarwal
<bhavishaggarwal at gmail.com> wrote:
> Hi David,
>
>  Thanks for your reply. I managed to remove both the initial and
>  congestion backoff by editing the CC2420RadioM.nc file and replacing
>  signals to MacBackoff.initialBackoff() and
>  MacBackoff.congestionBackoff() by the value 0.
>
>  Cheers,
>
>  Bhavish
>
>  On Fri, Apr 4, 2008 at 9:09 PM, David Moss <dmm at rincon.com> wrote:
>  > The proper way to disable CCA is to tell the radio to transmit without CCA.
>  >
>  >  I don't support Tinyos 1.x, but if you look for a strobe command like
>  >  "STXONCCA" and change it to "STXON" then the radio will not use clear
>  >  channel assessments and there should never be a congestion backoff.  The
>  >  initial backoff should still be in play, and you will probably need to edit
>  >  the radio stack code to properly and completely remove it.
>  >
>  >  -David
>  >
>  >
>  >
>  >
>  >
>  >
>  >  -----Original Message-----
>  >  From: tinyos-help-bounces at millennium.berkeley.edu
>  >  [mailto:tinyos-help-bounces at millennium.berkeley.edu] On Behalf Of Bhavish
>  >  Aggarwal
>  >  Sent: Thursday, April 03, 2008 5:05 PM
>  >  To: tinyos-help
>  >  Subject: [Tinyos-help] Disable backoff CC2420 tmote sky
>  >
>  >  Hi,
>  >
>  >  I too tried the same solution for disabling backoffs i.e. setting the
>  >  value of the events initialBackoff and congestionbackoff to 0 and 1 in
>  >  CC2420RadioM. But it did not make any perceivable difference in the
>  >  time taken for a packet to be transmitted (the time difference between
>  >  the send call and sendDone signal). This time was 6 ms before and
>  >  after turning off backoff.
>  >
>  >  Is there something I missed in this procedure?
>  >
>  >  Thanks,
>  >
>  >  Bhavish
>  >
>  >  On Thu, Jan 24, 2008 at 7:31 PM, shamo <shamo2 at student.cityu.edu.hk> wrote:
>  >  >
>  >  >
>  >  >
>  >  >
>  >  > Dear Sir,
>  >  >
>  >  > I just read David's answer about how to disable backoff.I use tmote sky.As
>  >  > he said, I connect CC2420RadioM to MacBackoff, and write
>  >  initialBackoff(...)
>  >  > and congestionBackoff(...) event to return 0 or 1. However, it does not
>  >  > work. It seems that I can not disable the backoff in this way.I do not
>  >  know
>  >  > why.Please give me a help. Can you give me an example?
>  >  >
>  >  >
>  >  > Your answer:---------------
>  >  > TinyOS 1.x:
>  >  >
>  >  > configuration CC2420RadioC
>  >  > {
>  >  >   provides {
>  >  >     ...
>  >  >     interface MacControl;
>  >  >     interface MacBackoff;
>  >  >     ...
>  >  >   }
>  >  > }
>  >  >
>  >  >
>  >  > interface MacBackoff
>  >  > {
>  >  >   async event int16_t initialBackoff(TOS_MsgPtr m);
>  >  >   async event int16_t congestionBackoff(TOS_MsgPtr m);
>  >  > }
>  >  >
>  >  > Connect to MacBackoff, and when you get an initialBackoff(...) or
>  >  > congestionBackoff(...) event, return 0 or 1.  This method wasn't very
>  >  > friendly for systems that wanted to specify different backoff periods for
>  >  > different outbound AM types.  With extra programming, you can get the
>  >  event
>  >  > to set the backoff as you want it for any outbound message.
>  >  >
>  >  > -David
>  >  >
>  >  > ---------------------------------
>  >  >
>  >  >  ________________________________
>  >  >
>  >  >
>  >  >
>  >  >
>  >  > SHA Mo
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