Mojtaba,
Actually, i believe the bootAtTime is in 100's of pico seconds (10^-10)
seconds. So 1024 * 10^-10 = 0.0000001024, and apparently
sim_time_string() returns time in seconds (up to nano seconds (10^-9)).
There are actually 1024 milli "ticks" per second, so this is why each
timer fired is adding not quite 1.0 to the time.
As for your other issue, this is actually by design. If a node
transmits a broadcast packet, all other nodes in the transmission range
will receive it at the same time. The boot times only change when the
node powers up, but doesn't skew it's clock. In fact, i can't say for
100%, but I think that sim_time_string() grabs the global simulation
time, and there is no local clock simulation is TOSSIM.
-Paul
mojtaba raznahan wrote:
Hi Janos,
thanks for reply.
What's the meaning of this numbers ? I set the bootAtTime event as
these :
*t.getNode(0).bootAtTime(1024);
t.getNode(1).bootAtTime(1320);
t.getNode(2).bootAtTime(6000)*;
And i get the time by *"sim_time_string()*" method and it print the
boot times as this : 0:0:0.000000102 and 0:0:0.000000132 and
0:0:0.000000600 . As i can guess 102 means "1024" MilliSec and 132
means "1320" Milil.
And I set the startPeriodic at 1000 ,some thing is ambiguous.The last
statement prints the time equal to 0:0:0.000000142 the next statment
is *Timer.startPeriodic(1000)*,but in the output when i print the time
in *Timer.fired()* event, it prints the time equal to
*0:0:0.976562642* and the later *0:0:1.953125142* ,* 0:0:2.929687642*,
*0:0:3.906250142* what does it mean ?
And also when i send a packet, the 2 other recievers get the packet at
the same time!!(I've set the bootTimes differently!).
Thanks,
Mojtaba
On Mon, Nov 16, 2009 at 7:34 PM, Janos Sallai
<[email protected] <mailto:[email protected]>> wrote:
In tossim, the node object in python has a bootAtTime method which
lets you set when the mote boots. You can use this to make the local
clock's offsets different from each other. By the way, TOSSIM does not
simulate clock skew. This might limit the validity of the simulation
results.
Janos
On Mon, Nov 16, 2009 at 7:55 AM, mojtaba raznahan
<[email protected] <mailto:[email protected]>>
wrote:
> Hi all,
>
> I want to know how can I set the local time of each mote
programmatically ?
> I want to set different local time for each node then test my
> synchronization algorithm on them.
> I used the LocalTime interface to get the local time but i can't set
> different initial local time for each node.And LocalTime
interface has 2
> type "TMilli" and "TMicro" but when i use TMicro then in
configuration
> section there isn't any component provider for it! .I'm using
Tinyos 2.1.0
> and TOSSIM.
>
> Regards,
> --
> Mojtaba Raznahan
> BS of Computer engineering
> TMU university
> www.raznahan.com <http://www.raznahan.com>
>
> _______________________________________________
> Tinyos-help mailing list
> [email protected]
<mailto:[email protected]>
>
https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>
--
Mojtaba Raznahan
BS of Computer engineering
TMU university
www.raznahan.com <http://www.raznahan.com>
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