i m doing sinktrail a proactive data reporting protocol for wireless sensor network using tossim.... plz help throught for completion of this project,....thank you...
On Thu, Mar 26, 2015 at 5:38 PM, Aruna Kurhade <kurhade.ar...@gmail.com> wrote: > tossim execution requires actual mote for execution of the program > > On Thu, Mar 26, 2015 at 12:30 AM, < > tinyos-help-requ...@millennium.berkeley.edu> wrote: > >> Send Tinyos-help mailing list submissions to >> tinyos-help@millennium.berkeley.edu >> >> To subscribe or unsubscribe via the World Wide Web, visit >> >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> >> or, via email, send a message with subject or body 'help' to >> tinyos-help-requ...@millennium.berkeley.edu >> >> You can reach the person managing the list at >> tinyos-help-ow...@millennium.berkeley.edu >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of Tinyos-help digest..." >> >> >> Today's Topics: >> >> 1. Workaround for Timer bug ( IRIS modules) (Roadstar Runner) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Wed, 25 Mar 2015 00:46:58 -0400 >> From: Roadstar Runner <redstripe...@gmail.com> >> Subject: [Tinyos-help] Workaround for Timer bug ( IRIS modules) >> To: tinyos forum <tinyos-help@millennium.berkeley.edu>, Miklos Maroti >> <mmar...@gmail.com>, Janos Sallai <sal...@isis.vanderbilt.edu>, >> Eric >> Decker <cire...@gmail.com> >> Message-ID: >> < >> can3ao+wg18yqirvfdzaihbx8co9x77m8cz+edd5e-4pa388...@mail.gmail.com> >> Content-Type: text/plain; charset="utf-8" >> >> I recently cam across a possible bug in the Timer module for the IRIS >> motes. I occasionally noticed that the timer would fire very late thus >> causing a whole series of cascading failures in my modules. >> >> After days of debugging, I traced the problem to the routine >> setInterrupt() >> in the module Atm1281AlarmAsyncP. >> If the alarm is armed to fire after 1 TCNT tick, in some situations OCR2A >> will be loaded with a value that will essentially be in the "past", thus >> requiring TCNT2 to wrap around for the compare to occur (about 255 ms >> late). >> Since TCNT2 is a free running timer, if TCNT2 increments after the current >> time is captured by the call to Counter.get(), the *fired *flag will not >> be >> set, even though the alarm has technically expired. After this, under some >> circumstances, the compare register can be loaded with a wrong value. >> Consider the following situation when setInterrupt() is called >> >> >> to = 24 >> dt = 1 >> TCNT2 =1 >> base = 23 >> >> now if TCNT increments (TCNT2 = 2) after the current time is captured >> uint32_t now = call Counter.get(); >> >> Then the following condition will fail >> /* Check if alarm expired */ >> if ((uint32_t)(now - t0) >= dt) >> The following variables will be updated as indicated below, to compute >> anew value for OCCR2A >> alarm_in = 2 >> newOcr2A = 1 >> >> Since newOcr2A =1 and TCNT2 =2 , When OCCR2A is loaded, it will delay >> the next alarm by 255 ms. >> >> As a quick workaround, i added the following code to force the timers to >> fire after calling setOcr2A(newOcr2A); >> >> //work around >> if(newOcr2A >= TCNT) >> { >> diff = newOcr2A - TCNT ; >> } >> else >> { >> diff = (0xFF - TCNT) + newOcr2A ; >> } >> if( diff > MAXT) >> { >> fired = TRUE; >> } >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: >> https://www.millennium.berkeley.edu/pipermail/tinyos-help/attachments/20150325/ca091374/attachment-0001.htm >> >> ------------------------------ >> >> _______________________________________________ >> Tinyos-help mailing list >> Tinyos-help@millennium.berkeley.edu >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> >> End of Tinyos-help Digest, Vol 143, Issue 10 >> ******************************************** >> > >
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