Subject:
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Re: RCX Programming Questions and Sensor Ideas
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 11 Nov 1998 16:09:41 GMT
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Original-From:
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Paul Haas <PAULH@antispamHAMJUDO.COM>
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Viewed:
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3106 times
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On Wed, 11 Nov 1998, Todd Lehman wrote:
> Paul Haas writes:
> Paul, Are you sure you want to sleep before decrementing r31?
I think "oops" applies in this case. Your fix looks correct.
> p.s. I also wonder -- in avoiding harmonic task oscillation, is sleeping
> Might it be sufficient instead simply to busy-count to some random value?
It doesn't have to be random, just each task needs a different delay.
This is easy, since each task has to run its own version of the code. For
task 3 insert 3 noops, for task 6, 6 noops, etc...
The opcode for noop is 0x00. I'm not sure if that is defined in the .nqh
file. If not, it is easy to add (thanks Dave).
So, let's review; 1) Semaphores are possible. 2) It takes me a few tries
to write code that works.
Anyone want to write an example program that uses semaphores? We could
put a link to that code in the FAQ or give it to Dave Baum to put in with
the other nqc examples.
--
paulh@hamjudo.com http://www.hamjudo.com
The April 97 WebSight magazine describes me as "(presumably) normal".
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Message has 1 Reply:
 | | Re: RCX Programming Questions and Sensor Ideas
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| (...) Does that support an arbitrary number of tasks? If there are n tasks numbered 1 to n, and task k delays for k cycles on failure, I think you still have to be careful to make sure that the number of tasks n is smaller than the loop overhead h (...) (26 years ago, 11-Nov-98, to lugnet.robotics)
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Message is in Reply To:
| | Re: RCX Programming Questions and Sensor Ideas
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| (...) Paul, Are you sure you want to sleep before decrementing r31? As written, r31 is always >= 1 during the sleep -- which prevents any other tasks from obtaining a lock on the resource during this sleep time. In other words, once any two tasks (...) (26 years ago, 11-Nov-98, to lugnet.robotics)
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