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1.40: use of Timer / Timing

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1.40: use of Timer / Timing

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Ford Prefect

Senior Roboticist

Joined: Sat Mar 01, 2008 12:52 pm
Posts: 936
Location: a small planet in the vicinity of Beteigeuze

1.40: use of Timer / Timing

hi to all,
I don't get how the timer has to be used.
I need functions


	Code: reset timer(0) start timer(0) get timer(0) (milli seconds) stop timer (0) reset timer(1) start timer(1) get timer(1) (milli seconds) stop timer (1) ... a.s.o.

the help, as usual, won't help... :evil:

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Ford Prefect

Never purchase release 1.x ! (ancient programmer's wisdom)
"Don't argue with idiots. They'll drag you down to their level and then beat you with experience."

Fri Aug 08, 2008 2:39 pm

vnguyen

Site Admin

Joined: Wed Jan 24, 2007 10:44 am
Posts: 421
Location: Pittsburgh, PA

Re: 1.40: use of Timer / Timing

Does this help?

http://www.robotc.net/teachingmindstorm ... timers.pdf

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Fri Aug 08, 2008 3:49 pm

Ford Prefect

Senior Roboticist

Joined: Sat Mar 01, 2008 12:52 pm
Posts: 936
Location: a small planet in the vicinity of Beteigeuze

Re: 1.40: use of Timer / Timing

thx, but actually unfortunately not.
I see how to reset (clear) , but I don't see how to stop in between or how to read.
I don't understand T1 , time(T1): what is this?
That is really not understandable.

there should be a


	Code: int GetTimer(int timer); int this_time, that_time; ResetTimer(1); StartTimer(1); this_time=GetTimer(1); StopTimer(1); // do sth. special not depending from the timer; StartTimer(1); that_time=GetTimer(1); ResetTimer(1);

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Ford Prefect

Never purchase release 1.x ! (ancient programmer's wisdom)
"Don't argue with idiots. They'll drag you down to their level and then beat you with experience."

Fri Aug 08, 2008 4:00 pm

vnguyen

Site Admin

Joined: Wed Jan 24, 2007 10:44 am
Posts: 421
Location: Pittsburgh, PA

Re: 1.40: use of Timer / Timing

You have 4 timers: T1, T2, T3, and T4

To start and clear the timer you use:


	Code: ClearTimer[T1];

To "read" in 1 millisecond values use time1[T1]. time10[T1] will return it in 10 millisecond values.

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Vu Nguyen
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Fri Aug 08, 2008 4:03 pm

Ford Prefect

Senior Roboticist

Joined: Sat Mar 01, 2008 12:52 pm
Posts: 936
Location: a small planet in the vicinity of Beteigeuze

Re: 1.40: use of Timer / Timing

aaah.
so T1=0, T2=1, T3=2, T4=3 ?

and
this_time=time1[T1] means
this_time=GetTimer(T1)=GetTimer(0) (result in milli seconds ?)

ok, then there's only a intermediate stop missing, and a new start command afterwards... :?:

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Ford Prefect

Never purchase release 1.x ! (ancient programmer's wisdom)
"Don't argue with idiots. They'll drag you down to their level and then beat you with experience."

Fri Aug 08, 2008 4:10 pm

Dick Swan

Creator

Joined: Fri Feb 09, 2007 9:21 am
Posts: 613

Re: 1.40: use of Timer / Timing

There is no "pause" command. Only restart. In other OS that I have worked with I have never seen a "pause timer" command.

If you want other functionality you can "build" it yourself using the "nSysTime" variable which is essentially a 1-msec "clock". You can compare current time against whatever value you have saved to determine the time difference.

Sat Aug 09, 2008 4:16 am

Ford Prefect

Senior Roboticist

Joined: Sat Mar 01, 2008 12:52 pm
Posts: 936
Location: a small planet in the vicinity of Beteigeuze

Re: 1.40: use of Timer / Timing

hello,
thx, with nSysTime it's now working!

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Ford Prefect

Never purchase release 1.x ! (ancient programmer's wisdom)
"Don't argue with idiots. They'll drag you down to their level and then beat you with experience."

Sat Aug 09, 2008 4:41 am

Ford Prefect

Senior Roboticist

Joined: Sat Mar 01, 2008 12:52 pm
Posts: 936
Location: a small planet in the vicinity of Beteigeuze

Re: 1.40: use of Timer / Timing

sorry, just 1 more question:
if I use nSysTime for timing, and the program keeps running for a longer time (maybe 2 hours), won't there be an overflow some time?


	Code: int StartTime, myTime; StartTime=nSysTime; while (true) { mytime=nSysTime-StartTime; }

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Ford Prefect

Never purchase release 1.x ! (ancient programmer's wisdom)
"Don't argue with idiots. They'll drag you down to their level and then beat you with experience."

Sat Aug 09, 2008 5:06 am

Dick Swan

Creator

Joined: Fri Feb 09, 2007 9:21 am
Posts: 613

Re: 1.40: use of Timer / Timing

Yes. You will eventually get overflow. In about 25 days!

'nSysTime" is a signed 32-bit value that is reset to zero when NXT is powered up. We only want positive values so there's 31-bits. This overflow in 24.7days.

You can also use "nPgmTime" which is a similar 32-bit counter that is reset every time a program is run. It also stops incrementing when a program is suspended by the ROBOTC debugger which is (or can be) convenient when debugging programs.

Sun Aug 10, 2008 1:24 am

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