danielf
07-10-2001, 09:01 AM
I'm using the parallel port on a touch-screen PC to control part of my Hi-Fi system. But I need to be able to generate an interrupt from the ACK signal on either negative OR positive edges (the PC default is negative-only; but if it can be changed, I can change the polarity on each interrupt, to wait for the next pulse-edge [I want to measure pulse-widths]).
Can anyone tell me the port's chip type number? It will probably vary from manufacturer to manufacturer, and maybe over time too (progress!), but is probably still register-compatible with some "industry-standard" chip. If I know the chip type I can look up its data sheet to see how to program the interrupt edge polarity.
Many thanks,
Daniel
Can anyone tell me the port's chip type number? It will probably vary from manufacturer to manufacturer, and maybe over time too (progress!), but is probably still register-compatible with some "industry-standard" chip. If I know the chip type I can look up its data sheet to see how to program the interrupt edge polarity.
Many thanks,
Daniel