利用红外线接收器触发中断信号

来源：互联网发布：京东大数据平台架构编辑：程序博客网时间：2024/04/29 14:12

开发板：龙芯1B

PC：ubuntu13.10

本程序利用红外线接收器触发中断信号，然后打印信息，红外线接收器通过gpio控制

/*************************************************************************> File Name: redlight_irq.c> Author: kid> Mail: 280197326@qq.com > Created Time: 2014年03月04日 星期二 16时07分55秒 ************************************************************************/#include <linux/interrupt.h>#include <linux/module.h>#include <linux/init.h>#define SET_GPIO (*(volatile unsigned *)0xbfd010C4)#define SET_IN (*(volatile unsigned *)0xbfd010D4)#define SET_RED (*(volatile unsigned *)0xbfd010F4)int *j = (int*)125;int i = 0;static irqreturn_t redlight (int k, void *p){    printk(KERN_ALERT "%d.receive redlight!\n",i);    i++;    return (IRQ_HANDLED);}static int __init redlight_init(void){    int result;    SET_GPIO = SET_GPIO | 0x20000000;    SET_IN = SET_IN | 0x20000000;    SET_RED = SET_RED | 0x20000000;    result = request_irq(125, redlight, IRQF_SHARED|IRQ_TYPE_LEVEL_LOW, "redlight", j);   //请求中断,IRQ_TYPE_LEVEL_LOW为低电平有效    if( result!=0  ){        printk(KERN_WARNING "result=%d\nrequest_irq is fail\n",result);        }    enable_irq(125);    return 0;}static void __exit redlight_exit(void){    free_irq(125, j);   //释放内存    printk(KERN_ALERT "quit!\n");}module_init(redlight_init);module_exit(redlight_exit);MODULE_LICENSE("GPL");

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