How to generate interrupts from lpt port?

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2 total messages Started by SERGEJEW A Fri, 20 Nov 1992 08:15

#784

Author: SERGEJEW A
Date: Fri, 20 Nov 1992 08:15

28 lines
1974 bytes

I have a student who is trying to convert a psychophysiology program
from polling to interrupt-driven and we've struck a conceptual hurdle
with the input side of things.  The idea is to have a couple of push
buttons under the control of the subject be registered by the PC.
Previously the buttons had been connected to a games port and the right
port addresses polled to catch the button press.  Moving to an
interrupt-driven model, since we couldn't figure out how to generate
an interupt from the games port, we thought we'd try instead the control
lines of the centronics lpt port.  The only problem is, although polling
can catch lpt status changes, we can't figure out how to set an interrupt
off this either.

Can anyone tell us how to do this if it is possible at all?  If not,
does anyone have any bright ideas on how to generate an interupt on a
button-press?

Thanks in anticipation
Alex.
---
Dr Alex A Sergejew,   Center for Applied Neurosciences,   Swinburne    _--_|\
University of Technology, PO Box 218, Hawthorn, Vic 3122, Australia.  /      \
Internet: aas@swin.oz.au                                              \_.--.x/
Phone:    (voice) +61-3-819 8891      (fax) +61-3-819 0856                  v
-- 
Dr Alex A Sergejew,   Center for Applied Neurosciences,   Swinburne    _--_|\
University of Technology, PO Box 218, Hawthorn, Vic 3122, Australia.  /      \
Internet: aas@swin.oz.au                                              \_.--.x/
Phone:    (voice) +61-3-819 8891      (fax) +61-3-819 0856                  v

Re: How to generate interrupts from lpt port?

#792

Author: Juha Pehkonen
Date: Mon, 23 Nov 1992 13:39

13 lines
840 bytes

aas@stan.xx.swin.oz.au (SERGEJEW A) writes:

>lines of the centronics lpt port.  The only problem is, although polling
>can catch lpt status changes, we can't figure out how to set an interrupt
>off this either.

I won't be able to help you much yet, but I'll try to find out and send you
more information later today. Meanwhile, I suppose you know which interrupt
is used by Lpt port? 

Juha Pehkonen
jpehko@cs.joensuu.fi
University of Joensuu, Finland

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