Yes, that's helpful - thank you.
As for the FreeBSD part it looks like you use inb() and outb() to read
and write locations from /dev/io.
That PC87366 chip can do practically everything!
JD
On Apr 3, 2014, at 3:03 AM, Lars Noodén wrote:
On 04/03/2014 02:06 AM, John David Duncan wrote:
Hi,
My old Net4801 has a 20 pin header for "12 bit general purpose I/O".
I'm wondering if I could connect switches and LEDs to this header and
access them from FreeBSD. Can anyone point me to some documentation?
Thanks,
JD
Yes, at the simplest you can solder some short wires and very small
sockets to an LED and to simulate a switch to use as a jumper another
pair to just a plain wire. Then you can plug them as needed onto pins
on JP5:
http://soekris.com/media/manuals/net4801_manual.pdf
Poking the pins with a multimeter was doable but just too awkward and
unpleasant so I used one such LED when working out use of GPIO in
OpenBSD on the 4801 and 5501. With help, I set up GPIO control of
house
current and wrote up both the hardware and the software:
http://www.bsdly.net/~lars/Distance-Ed-server/des.html
I was pressed for time when I made the page so it is not quite
polished
and now it is also out of date a bit. Also, that was just output no
input
from GPIO. So it won't help with the FreeBSD side of things but
might give
some ideas on hardware methods.
Regards,
/Lars
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