Kontron KTLX800-pITX Bedienungsanleitung PDF herunterladen (Seite 18)

KTD-S0023-A Page 15 CPLD Interface

KTLX800/pITX Software Guide

5.2.2 Digital I/O Example

#include <stdio.h>

#include <dos.h>

#include <conio.h>

#define CPLD_BASE_ADDR 0xB00

#define GPIO_INPUT_OFFS 0x00

#define GPIO_OUTPUT_OFFS 0x02

#define GPIO_DIRECTION_OFFS 0x04

void RouteDigitalIO (unsigned int value)

{

outpw (CPLD_BASE_ADDR+GPIO_DIRECTION_OFFS, value);

}

void WriteDigitalIO (unsigned int value)

{

outpw (CPLD_BASE_ADDR+GPIO_OUTPUT_OFFS, value);

}

unsigned int ReadDigitalIO (void)

{

unsigned int value;

value = inpw (CPLD_BASE_ADDR+GPIO_INPUT_OFFS);

return value;

}

void main (void)

{

unsigned int val;

RouteDigitalIO (0xFFFF);

WriteDigitalIO (0xAA55);

val = ReadDigitalIO ();

printf ("\nInput value = %04X\n", val);

}

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