Trev Jackson wrote:
Hi Mark
There is probably nothing wrong with your parallel port, Pin 12 and Pin 13 are
inputs to your computer and depending on how your parallel port is
implemented the voltages could quite reasonably be different between the
pins.
OK, this does seem to be the case as the parallel port works fine with
lmilk and your CMOS buffer arrangement. I just assumed they should be
pulled to +5V (from other things that I've read).
To check the parallel port voltages try running the command:
lmilk -2
As well as reading I2C data from pin 12 and 13 this command switches D0 to D7
to produce an output voltage.
If you then measuring between pins 2,3,4,5,6,7,8,9 and 25, because these pins
are outputs they should produce some sort of reasonable voltage on any
computer.
Yes, you are right -- they get +5V.
I'm interested as to what weird arrangement could lead to the parallel
port having such voltages (but I guess it doesn't matter too much to the
business in hand).
Thanks,
Mark
-------------------------------------------------------
SF.Net email is Sponsored by the Better Software Conference & EXPO
September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA
Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
_______________________________________________
ivtv-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/ivtv-devel
