[Tinyos-help] A clock problem trouble me for a long time

[Michael Schippling]

Well, that's an interesting question...
I think your output is from the simulator?
I haven't really checked, but I also haven't noticed
a big difference in time-between-interrupts on mica2's
using TimerC, and since the sim is not timing using
interrupts I'd not be surprised to see your divergence.

On the 3ms thing...I see a note in TimerM:
    * This implementation assumes that DEFAULT_SCALE is 3.
But I have no idea to what it refers as I can't find
"DEFAULT_SCALE" used anywhere else. I have run a 1ms Timer
on mica2's, but the same code didn't work on micaz's and I
never investigated, so that might have something to do with it.

Anyway, your original message said you wanted a 3ms timer...?
MS



roy liu ^-^ wrote:
> schip,
>   I have tried in the Blink app.The result showed that the clock frequence changed during the silulation. As below:
> 
> : CLOCK: event handled for mote 0 at 0:0:14.80509050 (15624 ticks).
> interval to 4 @ 0:0:14.80509050
> : CLOCK: event handled for mote 0 at 0:0:14.80899650 (15624 ticks).
> interval to 4 @ 0:0:14.80899650
> : CLOCK: event handled for mote 0 at 0:0:14.81290250 (15624 ticks).
> interval to 0 @ 0:0:14.81290250
> : CLOCK: event handled for mote 0 at 0:0:15.06288650 (999936 ticks)
> interval to 4 @ 0:0:15.06288650
> : CLOCK: event handled for mote 0 at 0:0:15.06679250 (15624 ticks).
> interval to 4 @ 0:0:15.06679250
> : CLOCK: event handled for mote 0 at 0:0:15.07069850 (15624 ticks).
> 
>   As the author said in TimerM that TimerM cannot support continuous timers that fire faster than every 3 ticks (3ms).
> Does that mean I have no choice but to update to tinyos2.0 version? ohh,I am so depressed.
> 
> ------------------				 
> roy  liu ^-^
> 2007-01-16
> 
> -------------------------------------------------------------
> From：Michael Schippling
> Data：2007-01-15 05:16:07
> To：roy liu ^-^
> Copy：tinyos-help
> Subject：Re: [Tinyos-help] A clock problem trouble me for a long time
> 
> If that's 3 MILLI-sec you should be able to use the standard
> TimerC interface/code as is done in the Oscilloscope demo app.
> MS
> 
> roy liu ^-^ wrote:
>> hi,everyone 
>>      I want to implement a timer fired every 3ms.Someone suggest me to use Timermillic,but it is implemented in the tinyos2.0 and my version is 1.1.15.
>>     Is it possible for me to achieve my project without updating?
>> thx a lot 
>>  				
>> BestRegards
>> roy  liu ^-^
>> 2007-01-14
>>
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