I'm in the process of trying to port a really old (1993 or so) QBASIC
program to C. The program interfaces with an LCD device which is
controlled via the parallel port.
I've read a fair bit of stuff about using outb() and friends in Linux C
programs, but my problem is that it just doesn't seem to do what I want
it to do. When I want to send data out to the LCD device I believe I
need to send it by using hex values, where as I think QBASIC uses
So am I right in thinking that these two parts of each program are
exactly the same?
OUT 888, 15
OUT 890, 7
OUT 890, 3
My C Source:
If I can't get this to work I plan on re-writing my test program to use
the /dev/parport interface and ioctls, but I'm not sure if this would
help. It's a user-space program, I'm using -O2 with GCC so that outb()
and that works. I'm using (just for now) iopl(3) to get access from the
kernel to all ports on the system, but no matter what I do it seems it
just doesn't want to work, when I run my C program (as root) it does
some stuff to the LCD display but nothing like what I want it to do.
When I run the QBASIC program off a boot disk in the same PC it works
fine. I can post my source code if you like or send it to you in a
private e-mail, it's very small (20 lines or so).
-- Regards, Robert Davidson. http://www.mlug.org.au/ IRC: puttputt, AustNet, #mlug
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