Specifications

A-1

Appendix AExample PCI User-Level Device Driver

This appendix contains an example of a user-level device driver for a National Instruments

PCI DIO-96 card.

* PCIex.c

* Sample very simple user level driver for National Instruments

* PCI DIO-96 card.

* Turns a LED on and off at two second intervals for two minutes.

* The Anode of LED is connected to pin 47 and the Cathode is

* connected to 510 ohm resistor which is connected to pin 49,

* which is +5 volts.

* The default power on state for the parallel port will be tristate

* which result in a off LED state.

* The manual for this card is available at following Web site.

* http://www.natlinst.com/manuals/

* User must have super user privledges to run.

* To compile use the following string.

* cc -F -lud -o PCIex PCIex.c

#include <errno.h>

#include <fcntl.h>

#include <stdio.h>

#include <sys/ipl.h>

#include <sys/ipc.h>

#include <sys/signal.h>

#include <sys/lock.h>

#include <sys/mman.h>

#include <sys/resource.h>

#include <sys/shm.h>

#include <sys/types.h>

#include <sys/ioacc.h>

#include <userdriv.h>

#include <sys/pci.h>