Specifications

Table Of Contents

/* POLL.C

Permission is hereby granted to the purchaser of the WinSystems

UIO cards and CPU products incorporating the UIO device, to distribute

any binary file or files compiled using this source code directly or

in any work derived by the user from this file. In no case may the

source code, original or derived from this file, be distributed to any

third party except by explicit permission of WinSystems. This file is

distributed on an "As-is" basis and no warranty as to performance,

fitness of purposes, or any other warranty is expressed or implied.

In no case shall WinSystems be liable for any direct or indirect loss

or damage, real or consequential resulting from the usage of this

source code. It is the user's sole responsibility to determine

fitness for any considered purpose.

#include <stdio.h>

#include <conio.h>

#include "uio48.h"

#define BASE_PORT 0x120

/* This program uses the edge detection interrupt capability of the

WS16C48 to count transitions on the first 24 lines. It does this

however, no by using true interrupts but by polling for transitions

using the get_int() function.

/* Our transition totals are stored in this array */

unsigned int_counts[25];

/* Definitions for local functions */

void check_ints(void);

void main()

{

int x;

/* Initialize the I/O ports. Set all I/O pins to input */

init_io(BASE_PORT);

/* Initialize our transition counts, and enable falling edge

transition interrupts.

for(x=1; x<25; x++)

{

int_counts[x] = 0; /* Clear the counts */

enab_int(x,FALLING); /* Enable the falling edge interrupts */