Open a terminal (Application menu : Accessory > Terminal), where you
can enter the given commands (line starting with the $ prompt symbol).

We suppose we are in your prefered directory. For you it is probably
something like "/home/carlos". For this tutorial il will be replaced
by a generic "/path" :

$ pwd
/path

First, you donwload the program's archive in your prefered "/path/
Download" directory.

$ mkdir Download
$ wget "http://cvs.zerfleddert.de/cgi-bin/viewcvs.cgi/usb-
driver.tar.gz?view=tar" -O Download/usb-driver.tar.gz

Now you go in your prefered work directory (for me it is called
"Travail" :) and you decompress the archive.

$ cd /path/Travail
$ tar zxvf /path/Download/usb-driver.tar.gz
$ cd usb-driver

First thing to do is to check if README or INSTALL files exist, and
_READ_ them.

$ ls -l
$ more README

Now you know what to do. First you check the required module are
loaded.

$ lsmod | grep parport
parport_pc             38340  1
parport                39560  3 ppdev,lp,parport_pc

If you get something like that, it's ok. You can compile.

$ make

You may get this kind of error :

gcc -fPIC -Wall usb-driver.c -o libusb-driver.so -ldl -lusb -lpthread -
shared
usb-driver.c:36:17: erreur: usb.h : Aucun fichier ou répertoire de ce
type

It's because you have not installed one of the required libusb and
libusb-dev library.
You can install libusb-dev this way :

$ sudo apt-get install libusb-dev

Now you can retry the compilation.

$ make
gcc -fPIC -Wall usb-driver.c -o libusb-driver.so -ldl -lusb -lpthread -
shared
gcc -fPIC -DDEBUG -Wall usb-driver.c -o libusb-driver-DEBUG.so -ldl -
lusb -lpthread -shared

This time, if everything goes right, you can try impact :) As
explained in the README, set the preload environnement variable (this
will be set only for the current terminal) :

$ export LD_PRELOAD=/path/Travail/usb-driver/libusb-driver.so

Now, you can run impact. But you may get an error :

Can't open /dev/parport0: Permission denied
LPT port is already in use. rc = 0h
Cable connection failed.
Reusing 79063641 key.
Reusing FD063641 key.

It means you have not the required right on the /dev/parport0 device.
You can check this this way :

$ ls -l /dev/parport0
crw-rw 1 root lp 99, 0 2007-03-16 07:48 /dev/parport0

A fast work arround solution is to change the owner of this device :

$ whoami
luzerne
$ sudo chown luzerne /dev/parport0

Before retrying to program a device with impact, it may be necessary
to disbale the eventual impact cable locking. This can be done this
way :

$ impact -batch

http://www.chezmoicamarche.org / YMMV / HTH

Luzerne GANHIR