I just found this mailing list today and thought I'd mention a new
programming library that I released a few months back that might be of
"parapin" (http://www.circlemud.org/~jelson/software/parapin) is a
parallel port programming library for Linux. The library makes it
easy to write C code under Linux that controls individual pins on a PC
parallel port. This kind of control is very useful for electronics
projects that use the PC's parallel port as a generic digital I/O
interface. Parapin goes to great lengths to insulate the programmer
from the somewhat complex parallel port programming interface provided
by the PC hardware, making it easy to use the parallel port for
digital I/O. By the same token, this abstraction also makes Parapin
less useful in applications that need to actually use the parallel
port as a parallel port (e.g., for talking to a printer).
Parapin has two ``personalities'': it can either be used as a
user-space C library, or linked as part of a Linux kernel module. The
kernel module plays nicely with the 'parport' module.
The user and kernel personalities were both written with efficiency in
mind, so that Parapin can be used in time-sensitive
applications. Using Parapin should be very nearly as fast as writing
directly to the parallel port registers manually.
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