Subject:
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RE: USB Port problems
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 22 Apr 2002 17:34:21 GMT
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Original-From:
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Rob Limbaugh <RLIMBAUGH@GREENFIELDGROUPspamcake.COM>
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Viewed:
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709 times
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Besides turning off virus scanning software (which shouldn't be necessary), make
sure you have the latest update drivers for your computer hardware. If that
doesn't work, then the problem is most likely a hardware resource allocation
problem.
Many systems (especially pre-built ones, such as Compaq's) like to share IRQs
unnecessarily, especially IRQ11 for USB and Video. Generally, this isn't a
problem unless multiple devices are competing for the processor's attention at
once.
Typically, I set things up accordingly:
Video: IRQ11 (If I can't adjust this manually, then I don't share any thing
else with it)
Sound cards: IRQ10 (OK to share this with most other devices)
Network Cards: IRQ5 (OK to share this with most other devices)
USB: IRQ9/2 (IRQ9 and IRQ2 are a shared IRQ) (OK to share this with most
other devices)
IRQ's 1, 3, 4, 6, 7, 8, 12, 13, 14, and 15 are typically unavailable.
If your computer DOES NOT have a video capture card and DOES allow you to turn
off "IRQ for VGA", you can gain access to IRQ11 for other devices.
If you only need one physical COM port, the 2nd one can be disabled which frees
up IRQ3.
Most people use two IDE channels on their computers to improve performance. If
standard CD-ROM performance isn't a big issue, IRQ15 can be freed up by turning
off the Secondary channel and placing the hard drive and CD-ROM drive on the
same cable (HD as Master, CD as Slave).
SCSI cards tend to throw these general settings out the window... in such cases,
I remove network and sound cards to reconfigure SCSI cards and then add the
network card, then sound.
It also helps to set LPT ports to "Bi-Directional" or "EPP" instead of "ECP".
ECP uses a DMA and most printers don't need it. (Generally, only
Fax-Printer-Scanner combo's need the ECP function). Many newer printers won't
have their full features available if "Standard" or "Output Only" is chosen.
You'd be amazed at how many seemingly un-related problems can be resolved by
changing this setting.
The usual disclaimers apply...
Rob
-----Original Message-----
From: Baha Baydar [mailto:bbaydar@hfx.eastlink.ca]
Sent: Monday, April 22, 2002 9:57 AM
To: Ed.Dineen@us.pm.com; lego-robotics@crynwr.com
Subject: Re: USB Port problems
I have/had the same sorts of problems with my Intel USB cam. I found that
updating drivers and turning off my anti-virus software made it about 75%
more stable.
Hope that helps a little bit.
----- Original Message -----
From: <Ed.Dineen@us.pm.com>
> Has anyone had a problem with Vision Command and USB ports?
>
> I have vision command installed on a Gateway PC running Win 98 SE. Vision
> command installs correctly, the camera works for awhile then vision • command
> hangs up.. The PC hangs up, camera wont respond with current images, just
> keeps a still of prior image on the screen. I have to reboot to get it
> running again.
>
> Samre thing happens when I switch from the camera setup screen to the
> challenges screen.
>
> I am assuming that it is the USB port as I have eliminated just about • every
> other cause.
>
> Ed Dineen
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