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 <[EMAIL PROTECTED]> 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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] 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 <[EMAIL PROTECTED]> 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 > > _______________________________________________ > > Tinyos-help mailing list > > [email protected] > > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
