中断方式按键驱动实验器材:ok6410开发板RedHat5.0实验目的:利用中断方式来测试按键驱动实验原理:从上图可以得出:<1>当按键没有按下时,为高电平;当按下时,为低电平<2>S[2-7]按键分别对应的是外部中断XEINT[0-5]驱动程序:#include<plat/regs-gpio.h>#include<plat/gpio-bank-n.h>#include<linux/device.h>#include<linux/kernel.h>#include<linux/module.h>#include<linux/init.h>#include<linux/fs.h>#include<linux/errno.h>#include<linux/poll.h>#include<linux/interrupt.h>#include<linux/irq.h>#include<asm/irq.h>#include<asm/io.h>#include<mach/hardware.h>#include<linux/miscdevice.h>#defineGPNCON0x7F008830#defineGPNDAT0x7F008834volatileunsignedlong*s3c6410_GPNCON;volatileunsignedlong*s3c6410_GPNDAT;staticstructclass*mysecond_key_class;staticstructdevice*mysecond_key_class_dev;staticDECLARE_WAIT_QUEUE_HEAD(key_waitq);//定义一个等待队列头/*中断事件标志，中断服务程序将它置１，ｒｅａｄ函数将它置０*/staticvolatileintev_press=0;/*键值:按下时,0x01,0x02,0x03,0x04,0x05,0x06*//*键值:松开时,0x81,0x82,0x83,0x84,0x85,0x86*/staticunsignedintkeyvals;structmysecond_key{unsignedintirq_no;//中断号unsignedintkey_val;//键值unsignedintnum;//按键数char*name;//按键名字};staticstructmysecond_keysecond_keys[6]={{IRQ_EINT(0),0x01,0,"KEY1"},{IRQ_EINT(1),0x02,1,"KEY2"},{IRQ_EINT(2),0x03,2,"KEY3"},{IRQ_EINT(3),0x04,3,"KEY4"},{IRQ_EINT(4),0x05,4,"KEY5"},{IRQ_EINT(5),0x06,5,"KEY6"},};staticirqreturn_tmykey_handle(intirq,void*dev_id){intnum;unsignedinttmp;unsignedintpinval;structmysecond_key*pindesc=(structmysecond_key*)dev_id;num=pindesc->num;tmp=readl(S3C64XX_GPNDAT);//读出GPNDAT的值pinval=(tmp&(1<<num));if(pinval)//松开{keyvals=pindesc->key_val|0x80;}else//按下{keyvals=pindesc->key_val;}ev_press=1;//将按键标识符置1wake_up_interruptible(&key_waitq);//唤醒睡眠returnIRQ_RETVAL(IRQ_HANDLED);}staticintmysecond_key_open(structinode*inode,structfile*file){/*配置GPN[0-5]为中断引脚*/inti=0;interr;for(i=0;i<sizeof(second_keys)/sizeof(second_keys[0]);i++){err=request_irq(second_keys[i].irq_no,mykey_handle,IRQ_TYPE_EDGE_BOTH,second_k