In message <20020710194653.E19674@redhat.com>, Tim Waugh writes:
>On Wed, Jul 10, 2002 at 01:40:15PM -0400, Robert Heller wrote:
>> Does there exist a really simple driver that allows one to read (in user
>> mode) the state of the parallel port.
I am looking for a driver that *user mode* code can access with a
'read()' that reads the data port, as a single byte, not the status
bits! The read() should not hang (eg should return right away with one
byte of data). I am hoping some simple, stupid driver that does this
already exists out there, so I don't have to write one from scratch.
What I am looking to do is use an old laptop as part of a control panel
for a Model RR control station. I'm playing on connecting stuff like
thottle and brake controls to the Joystick port *some* buttons/switches to
the Joystick buttons, but I need more than the 4 On/Off inputs the
Joystick port provides and I want to put the extra on the parallel port.
I'm planing on feeding a video source (from a Axis network camera or
similar) to the display panel. I just want to poll the extra switches
on the parallel port.
Oh, I am thinking of using a 2.2.x kernel, if possible.
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