Version 2.0.1 fixed my issues.
Thanks for the help!
On Thu, 2007-05-24 at 10:08 -0700, David Gay wrote:
> On 5/24/07, Jon Green <[EMAIL PROTECTED]> wrote:
> > I'm having a problem using the TimerMilliC component on a micaz mote.
> > Occasionally the local time as reported by the getNow() function seems
> > to jump backwards 255 microseconds, then jump forward and start counting
> > correctly.
>
> TinyOS 2.0 or 2.0.1? If 2.0, try 2.0.1 (the mica timer stuff was rewritten).
>
> David Gay
>
> > I am still researching the problem, but the sequence always seems to
> > look like this:
> > n-1
> > n-255
> > n+1
> > where n%255=0
> >
> > So maybe a 8 bit variable is overflowing somewhere in the counter code?
> > I was hoping someone a little more knowledgeable about tinyos might be
> > able to help me out and save me digging through all the timer subsystem
> > code.
> >
> > Heres a test case that shows this problem:
> >
> > module TestCaseC
> > {
> > uses interface Boot;
> > uses interface Timer<TMilli> as Timer;
> > uses interface UartDebug as Uart;
> > }
> >
> > implementation
> > {
> > uint8_t old;
> > uint8_t current;
> >
> > event void Boot.booted()
> > {
> > /* print anomalous values forever */
> > for(;;)
> > {
> > old = current;
> > current = call Timer.getNow();
> >
> > /* if the counter screwed up */
> > if(old > current)
> > {
> > /* output the values to the uart */
> > call Uart.Print("\n");
> > call Uart.PrintDec(total);
> > call Uart.PrintDec(end);
> > call Uart.PrintDec(call Timer.getNow());
> > }
> > }
> > }
> >
> > event void Timer.fired()
> > {
> > }
> >
> > }
> >
> > In the above test case UartDebug is just a component I use to output
> > debug data to the uart. PrintDec takes a 32bit number and outputs it to
> > the uart in decimal.
> >
> > Heres the first few lines of output from the test case:
> >
> > 255
> > 0
> > 258
> >
> > 511
> > 256
> > 515
> >
> > 767
> > 512
> > 771
> >
> > 1023
> > 768
> > 1027
> >
> > 1279
> > 1024
> > 1284
> >
> > 1535
> > 1280
> > 1540
> >
> > 1791
> > 1536
> > 1796
> >
> > 2047
> > 1792
> > 2052
> >
> > 2303
> > 2048
> > 2308
> >
> > 2559
> > 2304
> > 2564
> >
> > ...
> >
> > _______________________________________________
> > Tinyos-help mailing list
> > [email protected]
> > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
> >
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