通過IO埠讀取外部資料，帶中斷

基於fl2440開發板，核心版本2.6.28

主機平台：ubuntu 11.04 核心版本2.6.39

驅動**

#include #include #include #include #include #include /*設定中斷方式*/

#include #include #include #include #include //裝置名
#define io_device_name "my_io"
//主裝置號
#define io_device_major 240
//次裝置號
#define io_device_secondary 32
//返回乙個數x的第y位
#define mybit(x,y) ((x>>y)%2)
#ifndef _linux_irqreturn_h
#define _linux_irqreturn_h
typedef int irqreturn_t;
#define irq_none       (0)
#define irq_handled       (1)
#define irq_retval(x)      ((x) != 0)
#endif
/* * s3c2410 gpio edge detection for irqs:
* irqs are generated on falling-edge, rising-edge, both, low level or higg level.
* this must be called *before* the corresponding irq is registered.
*/#define ext_lowlevel		0
#define ext_highlevel		1
#define ext_falling_edge	2
#define ext_rising_edge		4
#define ext_both_edges		6
static int flag_0,flag_2;//中斷轉換標誌
static int cnt;
int data;
declare_wait_queue_head(io_wait);//宣告等待佇列
void io_con_set();
static irqreturn_t io_interrupt_0(int irq,void * dev_id,struct pt_regs *regs)
wake_up_interruptible(&io_wait);
}	return irq_handled;
}static irqreturn_t io_interrupt_2(int irq,void * dev_id,struct pt_regs *regs)
wake_up_interruptible(&io_wait);
}	return irq_handled;
}static int io_open(struct inode * inode,struct file * file)//開啟裝置函式
ret=request_irq(irq_eint2,io_interrupt_2,irqf_shared,io_device_name,1);//註冊中斷2
if(ret<0)
printk("the device is opened\n");
io_con_set();
cnt=0;
return 0;
}void io_con_set()//io埠控制暫存器初始化
static int io_close(struct inode * inode,struct file * file)//裝置關閉函式
static ssize_t io_read(struct file * filp,char  * buff,size_t count,loff_t  * f_ops)//讀取io埠
static struct file_operations io_device_fops = 
;static int __init io_init(void)//insmod載入驅動時執行
return 0;
}static int __exit io_exit(void)//rmmod解除安裝驅動時執行
module_init(io_init);
module_exit(io_exit);
module_license("gpl");

makefile

obj-m := my_io.o

kerneldir ?= /arm/linux-2.6.28.7-2440

pwd := $(shell pwd)

default:

$(make) -c $(kerneldir) m=$(pwd) modules

clean:

rm -f *.o *.ko *.order *.symvers

呼叫**：

#include #include #include #define my_device "/dev/my_io"

int main()
close(ret);
printf("the device is closed\n");
return 0;
}

通過IO埠讀取外部資料，帶中斷

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通過IO埠讀取外部資料，帶中斷

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