[Linux-parport] Parallel port specific questions
flexy at ee.oulu.fi
Sun Dec 12 11:23:55 EST 2004
I managed to get my self stuck with one project, which involves parallel port
polling or IRQs. Let me get a little more specific. Ummh, TOTALLY non profit
project, if somebody is wondering...
Laptop, ~100MHz Pentium, parallel port. What is needed from it? As precise info
about 4 input pins on parallel port as possible. Precise? Yes, time precise. As in,
1ms accurate information on when and which pin changed state. 1us would be better,
but propably that is way out of the capabilities of the laptop... The info could
be written to a file, for example... easy to use it with shell scripts :)
So, propably kernel module would get the most out of HW, ppdev according to my
studying of the subject, could be one solution?
I'm thinking of using 2.6.x kernel, what kernel options should be considered
for the timing accuracy to be the most that is possible for this HW? (Pre emptible,
etc) I can manage to do the "UI" and other stuff needed, with shell scripts etc,
but with this... I'm lost.
My C-programming capabilities are non existent, so this is kind of desperate
call of help :)
Any hints, programming examples, or even working code for this purpose would
be greatly appreciated.
P.S. Please include me on CC list when answering. Thanks.
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