Widget to manipulate parallel port signals ?

[Dave Johnson]

Michael ODonnell writes:
> 
> Anybody know of a (commandline or GUI) utility that I could use to
> wiggle/sense the individual data/control lines of a parallel port?
> I'd prefer that it operate using one of the standard drivers (like
> parport_pc) via ioctls rather than poking around directly in I/O
> or memory space at hardcoded addresses as I'd hope it'd be flexible
> enough to work with either an integral "legacy" device or an add-in
> device connected via PCI, USB, etc.
> 
> I found (but for the moment have misplaced the URL of) one that
> appears to be somebody's homework project; it has a GUI that presents
> the control/data lines separated into two clusters of buttons whose
> color indicates current state and that you can click to change
> their state, etc, etc, but it looked like I'd have to duplicate
> his C++ development environment to get it working, so before I go
> down that road I'm hoping somebody knows of one that'd be more of
> a turn-key experience...


I wrote a test program when I was making my lcd control daemon for my
router.

http://centerclick.org/temp/lcd.tgz

the part you want is lcdraw.c

it'll take commands from cmdline and do all basic operations to the
parallel port.

Usage: ./obj/lcdraw command [command...]
  command is one of:
    rr           data direction in
    rw           data direction out
    dr           data read
    dw value     data write
    cr           control read
    cw value     control write
    sr           status read
    kr           lcd data ram read
    kw value     lcd data ram write
    ir           lcd instruction ram read
    iw value     lcd instruction ram write

-- 
Dave