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and now it is also out of date a bit.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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