Subject:
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Re: preventing IR tower shutdown
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 14 Apr 1999 13:18:36 GMT
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Original-From:
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Laurentino Martins <lmartins@marktest.STOPSPAMpt>
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Viewed:
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956 times
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At 13:17 14-04-1999 Wednesday , Antony Furneaux wrote:
> This just might explain a problem I am having with a VB program.
> After a while my battery meter function stops getting a reply from
> the RCX. It calls the RCX every 10 secs from a Timer control
> event. Then all of a sudden, while the RCX is still on and doing
> things, the VB program can't get a response. When this has
> happened, even a ALiveOrNot call doesn't get a response.
> However, motor control commands do get sent to the RCX because
> the RCX does what it was told to do.
>
> The only way I could get back return values from the RCX when this
> has occurred, is to restart my VB program. Then all is well even
> without switching the RCX off and on.
I had a problem that happened a lot to me in Visual C++ and that might be or not be related with your problem.
Simply put, what happened was that a simple FOR/WHILE cycle waiting for a response of the unit was so processor intensive, that the timer would never get executed (since the timer it's a lot priority call).
I fixed it by pumping the system messages while running that FOR/WHILE cycle so that the timer would work.
You can pump the messages in C++ like this:
while( ::PeekMessage( &msg, NULL, 0, 0, PM_NOREMOVE ) )
AfxGetThread()->PumpMessage();
The VB code should be similar (?).
Laurentino Martins
[mailto:lau@mail.telepac.pt]
[http://www.terravista.pt/Enseada/2808/]
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
Message is in Reply To:
 | | Re: preventing IR tower shutdown
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| (...) I'm going to go at it from the other direction, I am writing an IDE (32 bit windows) for the pbFORTH system. My intention is to send a keepalive character every now and then to stop the tower going to sleep, at the moment I am debugging FORTH (...) (25 years ago, 14-Apr-99, to lugnet.robotics)
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