wait until next

[tinnitus]

Hello,

i have little trouble with wait until next ms

the first loop is very large around expected cycle value so it generate desynchronisation on devices...
ex:  my cycle is 10 second and first loop can reach 6 second in worst case !!!
is there tips to have correct timed loops and avoid 1st loop trouble ?

i tried 2 solutions to bypass this probleme but i loose a full cycle ( 10 sec)

1) with 1st call function and a condition structure but it looks heavy "timer01.vi"

2) with a pretempo before real working loop, it seems to be correct on few trys but i would like to have confirmation about repetability "timer02.vi"

here two files attached with a simplified exemple for theorie , the light have to light on only 2 sec out of 4

cordialy

Tinnitus
 

 

[altenbach]

Maybe you should use a plain "wait(ms), instead of a "wait next ms multiple".

Better yet, use a timed loop. See attached.

Message Edited by altenbach on 04-03-2008 05:20 PM

[tinnitus]

thank you altenbach,

i finally change to this structure, i tought  it was designed for  more  complex  applications,

now i  don't see when a wait until next can be usefull, or only if code takes 2 times less than loop cycle

Best regards

Tinnitus

[JB]

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tinnitus a écrit:
now i  don't see when a wait until next can be usefull, or only if code takes 2 times less than loop cycle

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See here... there is nothing wrong about this function. You only need to know how it works ! Sometimes it is the way to go, sometimes other solutions may be better.

[altenbach]

For some other discussion about "wait next ms multiple", also have a look at the following thread:

http://forums.ni.com/ni/board/message?board.id=170&message.id=291455&query.id=41686#M291455