Owner's manual

KTD-S0003-C Page 27 CPLD Interface

pITX-SP Software Guide

6.2.4 GPIO IRQ Example

It's very simple to check the interrupt feature. The picture shows how the jumper must be set. For testing

remove a jumper (breaks IRQ generation) and set it again. The interrupt assignment to IRQ7 is not change-

able.

Attention: Set the entry Advanced/Onboard DeviceConfiguration/Chipset Configuration/Serial IRQ Mode to Continuous.

J3202

J3201

J1800

Jum

BIOS Setup settings (entry Advanced/Onboard Device Configuration/GPIO Configuration):

GPIO Pin 0 IRQ Input

GPIO Pin 1 IRQ Input

GPIO Pin 5 Output

GPIO Pin 6 Output

Default Output State High

#include <conio.h>

#include <stdio.h>

#include <dos.h>

#define CPLD_BASE_ADDR 0xA80

#define GPIO_CONTROL 0x9F

#define GPIO_INPUT 0XA0

#define GPIO_OUTPUT 0xA1

#define GPIO_IRQ_POLARITY 0xA7

#define IRQ_FALLING_EDGE 0x00

#define IRQ_ENABLE 0x08

#define IRQ_BIT5 0x20

#define IRQ_BIT6 0x40

#define IRQ_TIMEOUT 10000

#define VECTOR_IRQ7 15

#define CTRL_8259 0x20

#define IMR_8259 0x21

#define EOI 0x20

#define IRQ_MASK 0x80 // Mask for IRQ7

#define __CPPARGS