rt_irq.c

RT-LINUX2.2源代码,RT-LINUX是硬实时操作系统,在实时性要求高的场合得到广泛应用

#include <linux/module.h>
#include <asm/rt_irq.h>
#include <asm/io.h>
#include <linux/cons.h>
#include "common.h"

static int output = 0xffffffff;

void intr_handler(void) {
	static int debug = 0;
	outb(output, LPT_PORT);
	output = ~output;
	if(debug++ == 1000){conpr("x"); debug = 0;}
}

int init_module(void)
{
	request_RTirq(LPT_IRQ, intr_handler);
	outb_p(0x10, LPT_PORT + 2);
	return 0;
} 


void cleanup_module(void)
{
	free_RTirq(LPT_IRQ);
}