Re: Two real time tasks?

> I have a question concerning running two real time tasks at once. 
> I've created two such tasks, one running every 250 microseconds, and 
> one every 10 millieconds. For testing purposes, I have each test turn 
> a parallel port line on when the task starts to run, and off just 
> before it goes back to sleep. Viewing the two outputs on a scope, 
> everything looks fine.
> 
> But, if the slower task takes longer than 250 microseconds to run 
> (actually the problem happens before then), it is not pre-empted to 
> allow the faster task to run. Instead, once it is done, the faster 
> task runs, and then the next instance of the faster task runs 
> earlier, presumably so that the average execution rate remains 250 
> microseconds.
> 
> Is there anything I can do to have execution of the slower task 
> halted to allow the faster task to run at the correct time, and then 
> return to the slower task when the faster task is finished?

Give the fast task a higher priority and it will preempt the slower task.

hofrat
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