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Unread 21-03-2010, 19:14
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Re: switching between Teleoperated enabled and Wathcdog notfed

Quote:
Originally Posted by Mark McLeod View Post
Your error is that you then go on to describe several tasks .
In my previous post I was describing a hypothetical simple example with only one task in the system: a 5ms task. I was not referencing your diagram (see below).

i.e. "assuming the 5ms task is the only task in the system" and "the CPU goes idle" etc.

By using an extremely simple example I was hoping to be able to frame clear and unambiguous questions. I need a rock to stand on. Once I've got that rock to stand on, I think I can envision how it works in a multi-task environment.

Quote:
P.S. Trick question: How many tasks do you see in the attached?
I see three.
Trickier than you might imagine. I don't know. I am not a LabVIEW programmer. I don't understand LabVIEW diagrams. I am trying to understand the real-time aspects of how LabVIEW works by referring to my embedded programming experience with assembly language and C, so I can explain the real-time aspects of LabVIEW to the programmers on our team who have never done real-time programming before. My programmers don't really understand what the Timer vi does, and I want to explain it to them. This is such a great opportunity for them to start to understand what real-time control and multitasking is about and how it works.

Thanks for dialoging with me. If I haven't worn out my welcome I would appreciate it if you could hang in here for just a bit longer. I sense that "aha" moment is imminent...

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