No subject

  typedef struct
  {
    uint32_t t0;
    uint32_t dt;
    bool isoneshot : 1;
    bool isrunning : 1;
    bool _reserved : 6;
  } Timer_t;



On Mon, May 19, 2008 at 11:06 AM, Paul Stickney <pstickne at gmail.com> wrote:

> I do not have a solid answer, but some things you may want to consider
> looking at:
>  -Maybe you are calling it with a smaller timeout than you suspect or
> earlier than expected
>  -The LED might be turned on by other code (internal or external)
>
>
> Paul
> _______________________________________________
> Tinyos-help mailing list
> Tinyos-help at millennium.berkeley.edu
> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>



-- 
Eric B. Decker
Research Associate
Autonomous Systems Lab
Jack Baskin School of Engineering
UCSC

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I&#39;ve been through the timer code in TinyOS2 pretty throughly.&nbsp; It is very low likelihood (via normal code execution, I am discounting a random memory writer) that a timer can fire before it is started.&nbsp; There is a control cell in the timer structure <b><i>&quot;isrunning&quot;</i></b> that has to be set for the fire signal to happen.&nbsp; This can only get set if the timer is started.&nbsp; Now if this bit is getting set through some other mechanism (like a run away) then all bets are off.<br>
<br>From tos/lib/timer/VirtualizeTimerC.nc.<br><br>&nbsp; typedef struct<br>&nbsp; {<br>&nbsp;&nbsp;&nbsp; uint32_t t0;<br>&nbsp;&nbsp;&nbsp; uint32_t dt;<br>&nbsp;&nbsp;&nbsp; bool isoneshot : 1;<br>&nbsp;&nbsp;&nbsp; bool isrunning : 1;<br>&nbsp;&nbsp;&nbsp; bool _reserved : 6;<br>&nbsp; } Timer_t;<br><br><br>
<br><div class="gmail_quote">On Mon, May 19, 2008 at 11:06 AM, Paul Stickney &lt;<a href="mailto:pstickne at gmail.com">pstickne at gmail.com</a>&gt; wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I do not have a solid answer, but some things you may want to consider<br>
looking at:<br>
 &nbsp;-Maybe you are calling it with a smaller timeout than you suspect or<br>
earlier than expected<br>
 &nbsp;-The LED might be turned on by other code (internal or external)<br>
<br>
<br>
Paul<br>
_______________________________________________<br>
Tinyos-help mailing list<br>
<a href="mailto:Tinyos-help at millennium.berkeley.edu">Tinyos-help at millennium.berkeley.edu</a><br>
<a href="https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help" target="_blank">https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help</a><br>
</blockquote></div><br><br clear="all"><br>-- <br>Eric B. Decker<br>Research Associate<br>Autonomous Systems Lab<br>Jack Baskin School of Engineering<br>UCSC<br>

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