控制IO端口 s3c2410_gpio_setpin()的使用 .

 本文基于FL2440 ARM开发板

Linux内核版本 2.6.28.7

arm-linux-gcc 3.4.1 

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/interrupt.h>/*设置中断方式*/
#include <linux/wait.h>
#include <linux/irq.h>
#include <asm/uaccess.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
//设备名
#define IO_DEVICE_NAME "my_io"
//主设备号
#define IO_DEVICE_MAJOR 240
//次设备号
#define IO_DEVICE_SECONDARY 32
//返回一个数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_EINT0   0
#define IRQ_EINT2   2
#define IRQ_EINT3   3
#define IRQ_EINT4   32
#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;//中断转换标志
static int cnt;
DECLARE_WAIT_QUEUE_HEAD(io_wait);//声明等待队列
void io_con_set();
static irqreturn_t io_interrupt_0(int irq,void * dev_id,struct pt_regs *regs)
{
    printk("**********the interrupt 0 works**********/n");
    if(flag_0==0)
    {
        cnt=(cnt+1)%2;
        flag_0=1;
        if(cnt==0)
        {
            printk("IN/n");
            s3c2410_gpio_setpin(S3C2410_GPB5,0);
            s3c2410_gpio_setpin(S3C2410_GPB6,1);
        }
        wake_up_interruptible(&io_wait);
    }
    return IRQ_HANDLED;
}
static irqreturn_t io_interrupt_2(int irq,void * dev_id,struct pt_regs *regs)
{
    printk("**********the interrupt 2 works**********/n");
    if(flag_2==0)
    {
        cnt=(cnt+1)%2;
        flag_2=1;
        if(cnt==0)
        {
            printk("OUT/n");
            s3c2410_gpio_setpin(S3C2410_GPB5,1);
            s3c2410_gpio_setpin(S3C2410_GPB6,0);
        }
        wake_up_interruptible(&io_wait);
    }
    return IRQ_HANDLED;
}
static int io_open(struct inode * inode,struct file * file)//打开设备函数
{
    int ret;
    set_irq_type(IRQ_EINT0,EXT_FALLING_EDGE);//设置中断0 触发方式
    set_irq_type(IRQ_EINT2,EXT_FALLING_EDGE);//设置中断2 触发方式
    // EXT_LOWLEVEL
    // EXT_HIGHLEVEL
    // EXT_FALLING_EDGE
    // EXT_RISING_EDGE
    // EXT_BOTH_EDGES
    disable_irq(IRQ_EINT0);
    disable_irq(IRQ_EINT2);
    enable_irq(IRQ_EINT0);
    enable_irq(IRQ_EINT2);
    ret=request_irq(IRQ_EINT0,io_interrupt_0,IRQF_SHARED,IO_DEVICE_NAME,1);//注册中断0
    if(ret<0)
    {
        printk("IRQ %d can not request/n",IRQ_EINT0);
        return ret;
    }
    ret=request_irq(IRQ_EINT2,io_interrupt_2,IRQF_SHARED,IO_DEVICE_NAME,1);//注册中断2
    if(ret<0)
    {
        printk("IRQ %d can not request/n",IRQ_EINT2);
        return ret;
    }
    printk("the device is opened/n");
    io_con_set();
    cnt=0;
    return 0;
}
void io_con_set()//IO端口控制寄存器初始化
{
     s3c2410_gpio_cfgpin(S3C2410_GPF0,S3C2410_GPF0_EINT0);
     s3c2410_gpio_cfgpin(S3C2410_GPF2,S3C2410_GPF2_EINT2);
     s3c2410_gpio_cfgpin(S3C2410_GPB5,S3C2410_GPB5_OUTP);
     s3c2410_gpio_cfgpin(S3C2410_GPB6,S3C2410_GPB6_OUTP);
}
static int io_close(struct inode * inode,struct file * file)//设备关闭函数
{
    free_irq(IRQ_EINT0,1);//释放中断
    free_irq(IRQ_EINT2,1);//释放中断
    printk("the device is closed/n");
    return 0;
}
static ssize_t io_read(struct file * filp,char  * buff,size_t count,loff_t  * f_ops)//读取IO端口
{
    wait_event_interruptible(io_wait,flag_0);
    wait_event_interruptible(io_wait,flag_0);
    flag_0=0;
    flag_2=0;
    //printk("the value is %d/n",io_data);
    copy_to_user(buff,(char *)&cnt,sizeof(cnt));
}
static struct file_operations io_device_fops =
{
    .owner=THIS_MODULE,
    .read=io_read,
    .open=io_open,
    .release=io_close,
};
static int __init io_init(void)//insmod加载驱动时执行
{
    int ret;
    ret=register_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME,&io_device_fops);
    if(ret<0)
    {
        printk("Fail to regist the device/n");
        return ret;
    }
    return 0;
}
static int __exit io_exit(void)//rmmod卸载驱动时执行
{
    unregister_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME);
    printk("the device has been unregisted/n");
}
module_init(io_init);
module_exit(io_exit);
MODULE_LICENSE("GPL");

#include <linux/kernel.h>#include <linux/init.h>#include <linux/module.h>#include <linux/fs.h>#include <linux/types.h>#include <linux/interrupt.h>/*设置中断方式*/#include <linux/wait.h>#include <linux/irq.h>#include <asm/uaccess.h>#include <mach/regs-gpio.h>#include <mach/hardware.h>//设备名#define IO_DEVICE_NAME "my_io"//主设备号#define IO_DEVICE_MAJOR 240//次设备号#define IO_DEVICE_SECONDARY 32//返回一个数x的第y位#define MYBIT(x,y) ((x>>y)%2)#ifndef _LINUX_IRQRETURN_H#define _LINUX_IRQRETURN_Htypedef int irqreturn_t;#define IRQ_EINT0 0#define IRQ_EINT2 2#define IRQ_EINT3 3#define IRQ_EINT4 32#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 6static int flag_0,flag_2;//中断转换标志static int cnt;DECLARE_WAIT_QUEUE_HEAD(io_wait);//声明等待队列void io_con_set();static irqreturn_t io_interrupt_0(int irq,void * dev_id,struct pt_regs *regs){printk("**********the interrupt 0 works**********/n");if(flag_0==0){cnt=(cnt+1)%2;flag_0=1;if(cnt==0){printk("IN/n");s3c2410_gpio_setpin(S3C2410_GPB5,0);s3c2410_gpio_setpin(S3C2410_GPB6,1);}wake_up_interruptible(&io_wait);}return IRQ_HANDLED;}static irqreturn_t io_interrupt_2(int irq,void * dev_id,struct pt_regs *regs){printk("**********the interrupt 2 works**********/n");if(flag_2==0){cnt=(cnt+1)%2;flag_2=1;if(cnt==0){printk("OUT/n");s3c2410_gpio_setpin(S3C2410_GPB5,1);s3c2410_gpio_setpin(S3C2410_GPB6,0);}wake_up_interruptible(&io_wait);}return IRQ_HANDLED;}static int io_open(struct inode * inode,struct file * file)//打开设备函数{int ret;set_irq_type(IRQ_EINT0,EXT_FALLING_EDGE);//设置中断0 触发方式set_irq_type(IRQ_EINT2,EXT_FALLING_EDGE);//设置中断2 触发方式// EXT_LOWLEVEL// EXT_HIGHLEVEL// EXT_FALLING_EDGE// EXT_RISING_EDGE// EXT_BOTH_EDGESdisable_irq(IRQ_EINT0);disable_irq(IRQ_EINT2);enable_irq(IRQ_EINT0);enable_irq(IRQ_EINT2);ret=request_irq(IRQ_EINT0,io_interrupt_0,IRQF_SHARED,IO_DEVICE_NAME,1);//注册中断0if(ret<0){printk("IRQ %d can not request/n",IRQ_EINT0);return ret;}ret=request_irq(IRQ_EINT2,io_interrupt_2,IRQF_SHARED,IO_DEVICE_NAME,1);//注册中断2if(ret<0){printk("IRQ %d can not request/n",IRQ_EINT2);return ret;}printk("the device is opened/n");io_con_set();cnt=0;return 0;}void io_con_set()//IO端口控制寄存器初始化{ s3c2410_gpio_cfgpin(S3C2410_GPF0,S3C2410_GPF0_EINT0); s3c2410_gpio_cfgpin(S3C2410_GPF2,S3C2410_GPF2_EINT2); s3c2410_gpio_cfgpin(S3C2410_GPB5,S3C2410_GPB5_OUTP); s3c2410_gpio_cfgpin(S3C2410_GPB6,S3C2410_GPB6_OUTP);}static int io_close(struct inode * inode,struct file * file)//设备关闭函数{free_irq(IRQ_EINT0,1);//释放中断free_irq(IRQ_EINT2,1);//释放中断printk("the device is closed/n");return 0;}static ssize_t io_read(struct file * filp,char * buff,size_t count,loff_t * f_ops)//读取IO端口{wait_event_interruptible(io_wait,flag_0);wait_event_interruptible(io_wait,flag_0);flag_0=0;flag_2=0;//printk("the value is %d/n",io_data);copy_to_user(buff,(char *)&cnt,sizeof(cnt));}static struct file_operations io_device_fops = {.owner=THIS_MODULE,.read=io_read,.open=io_open,.release=io_close,};static int __init io_init(void)//insmod加载驱动时执行{int ret;ret=register_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME,&io_device_fops);if(ret<0){printk("Fail to regist the device/n");return ret;}return 0;}static int __exit io_exit(void)//rmmod卸载驱动时执行{unregister_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME);printk("the device has been unregisted/n");}module_init(io_init);module_exit(io_exit);MODULE_LICENSE("GPL");  

Makefile同上一篇的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

 

 

这次本人修改了下内核头文件的目录，将目录./arch/arm/include下asm文件夹复制到./include

将目录./arch/arm/mach-s3c2410/include下mach文件夹复制到./include下

驱动修改版

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/interrupt.h>/*设置中断方式*/
#include <linux/wait.h>
#include <linux/irq.h>
#include <asm/uaccess.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
//设备名
#define IO_DEVICE_NAME "my_io"
//主设备号
#define IO_DEVICE_MAJOR 240
//次设备号
#define IO_DEVICE_SECONDARY 32
//返回一个数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_EINT0   0
#define IRQ_EINT2   2
#define IRQ_EINT3   3
#define IRQ_EINT4   32
#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;//中断转换标志
static int cnt;
DECLARE_WAIT_QUEUE_HEAD(io_wait);//声明等待队列
void io_con_set();
static irqreturn_t io_interrupt_0(int irq,void * dev_id,struct pt_regs *regs)
{
    if(flag_0==0)
    {
        printk("**********the interrupt 0 works**********/n");
        cnt=(cnt+1)%2;
        flag_0=1;
        if(cnt==0)
        {
            printk("IN/n");
            s3c2410_gpio_setpin(S3C2410_GPB5,0);
            s3c2410_gpio_setpin(S3C2410_GPB6,1);
        }
        wake_up_interruptible(&io_wait);
    }
    return IRQ_HANDLED;
}
static irqreturn_t io_interrupt_2(int irq,void * dev_id,struct pt_regs *regs)
{
    if(flag_2==0)
    {
        printk("**********the interrupt 2 works**********/n");
        cnt=(cnt+1)%2;
        flag_2=1;
        if(cnt==0)
        {
            printk("OUT/n");
            s3c2410_gpio_setpin(S3C2410_GPB5,1);
            s3c2410_gpio_setpin(S3C2410_GPB6,0);
        }
        wake_up_interruptible(&io_wait);
    }
    return IRQ_HANDLED;
}
static int io_open(struct inode * inode,struct file * file)//打开设备函数
{
    int ret;
    set_irq_type(IRQ_EINT0,EXT_FALLING_EDGE);//设置中断0 触发方式
    set_irq_type(IRQ_EINT2,EXT_FALLING_EDGE);//设置中断2 触发方式
    // EXT_LOWLEVEL
    // EXT_HIGHLEVEL
    // EXT_FALLING_EDGE
    // EXT_RISING_EDGE
    // EXT_BOTH_EDGES
    disable_irq(IRQ_EINT0);
    disable_irq(IRQ_EINT2);
    enable_irq(IRQ_EINT0);
    enable_irq(IRQ_EINT2);
    ret=request_irq(IRQ_EINT0,io_interrupt_0,IRQF_SHARED,IO_DEVICE_NAME,1);//注册中断0
    if(ret<0)
    {
        printk("IRQ %d can not request/n",IRQ_EINT0);
        return ret;
    }
    ret=request_irq(IRQ_EINT2,io_interrupt_2,IRQF_SHARED,IO_DEVICE_NAME,1);//注册中断2
    if(ret<0)
    {
        printk("IRQ %d can not request/n",IRQ_EINT2);
        return ret;
    }
    printk("the device is opened/n");
    io_con_set();
    cnt=0;
    return 0;
}
void io_con_set()//IO端口控制寄存器初始化
{
     s3c2410_gpio_cfgpin(S3C2410_GPF0,S3C2410_GPF0_EINT0);
     s3c2410_gpio_cfgpin(S3C2410_GPF2,S3C2410_GPF2_EINT2);
     s3c2410_gpio_cfgpin(S3C2410_GPB5,S3C2410_GPB5_OUTP);
     s3c2410_gpio_cfgpin(S3C2410_GPB6,S3C2410_GPB6_OUTP);
}
static int io_close(struct inode * inode,struct file * file)//设备关闭函数
{
    free_irq(IRQ_EINT0,1);//释放中断
    free_irq(IRQ_EINT2,1);//释放中断
    printk("the device is closed/n");
    return 0;
}
static ssize_t io_read(struct file * filp,char  * buff,size_t count,loff_t  * f_ops)//读取IO端口
{
    wait_event_interruptible(io_wait,flag_0&flag_2);
    flag_0=0;
    flag_2=0;
    //printk("the value is %d/n",io_data);
    copy_to_user(buff,(char *)&cnt,sizeof(cnt));
}
static struct file_operations io_device_fops =
{
    .owner=THIS_MODULE,
    .read=io_read,
    .open=io_open,
    .release=io_close,
};
static int __init io_init(void)//insmod加载驱动时执行
{
    int ret;
    ret=register_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME,&io_device_fops);
    if(ret<0)
    {
        printk("Fail to regist the device/n");
        return ret;
    }
    return 0;
}
static int __exit io_exit(void)//rmmod卸载驱动时执行
{
    unregister_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME);
    printk("the device has been unregisted/n");
}
module_init(io_init);
module_exit(io_exit);
MODULE_LICENSE("GPL");

#include <linux/kernel.h>#include <linux/init.h>#include <linux/module.h>#include <linux/fs.h>#include <linux/types.h>#include <linux/interrupt.h>/*设置中断方式*/#include <linux/wait.h>#include <linux/irq.h>#include <asm/uaccess.h>#include <mach/regs-gpio.h>#include <mach/hardware.h>//设备名#define IO_DEVICE_NAME "my_io"//主设备号#define IO_DEVICE_MAJOR 240//次设备号#define IO_DEVICE_SECONDARY 32//返回一个数x的第y位#define MYBIT(x,y) ((x>>y)%2)#ifndef _LINUX_IRQRETURN_H#define _LINUX_IRQRETURN_Htypedef int irqreturn_t;#define IRQ_EINT0 0#define IRQ_EINT2 2#define IRQ_EINT3 3#define IRQ_EINT4 32#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 6static int flag_0,flag_2;//中断转换标志static int cnt;DECLARE_WAIT_QUEUE_HEAD(io_wait);//声明等待队列void io_con_set();static irqreturn_t io_interrupt_0(int irq,void * dev_id,struct pt_regs *regs){if(flag_0==0){printk("**********the interrupt 0 works**********/n");cnt=(cnt+1)%2;flag_0=1;if(cnt==0){printk("IN/n");s3c2410_gpio_setpin(S3C2410_GPB5,0);s3c2410_gpio_setpin(S3C2410_GPB6,1);}wake_up_interruptible(&io_wait);}return IRQ_HANDLED;}static irqreturn_t io_interrupt_2(int irq,void * dev_id,struct pt_regs *regs){if(flag_2==0){printk("**********the interrupt 2 works**********/n");cnt=(cnt+1)%2;flag_2=1;if(cnt==0){printk("OUT/n");s3c2410_gpio_setpin(S3C2410_GPB5,1);s3c2410_gpio_setpin(S3C2410_GPB6,0);}wake_up_interruptible(&io_wait);}return IRQ_HANDLED;}static int io_open(struct inode * inode,struct file * file)//打开设备函数{int ret;set_irq_type(IRQ_EINT0,EXT_FALLING_EDGE);//设置中断0 触发方式set_irq_type(IRQ_EINT2,EXT_FALLING_EDGE);//设置中断2 触发方式// EXT_LOWLEVEL// EXT_HIGHLEVEL// EXT_FALLING_EDGE// EXT_RISING_EDGE// EXT_BOTH_EDGESdisable_irq(IRQ_EINT0);disable_irq(IRQ_EINT2);enable_irq(IRQ_EINT0);enable_irq(IRQ_EINT2);ret=request_irq(IRQ_EINT0,io_interrupt_0,IRQF_SHARED,IO_DEVICE_NAME,1);//注册中断0if(ret<0){printk("IRQ %d can not request/n",IRQ_EINT0);return ret;}ret=request_irq(IRQ_EINT2,io_interrupt_2,IRQF_SHARED,IO_DEVICE_NAME,1);//注册中断2if(ret<0){printk("IRQ %d can not request/n",IRQ_EINT2);return ret;}printk("the device is opened/n");io_con_set();cnt=0;return 0;}void io_con_set()//IO端口控制寄存器初始化{ s3c2410_gpio_cfgpin(S3C2410_GPF0,S3C2410_GPF0_EINT0); s3c2410_gpio_cfgpin(S3C2410_GPF2,S3C2410_GPF2_EINT2); s3c2410_gpio_cfgpin(S3C2410_GPB5,S3C2410_GPB5_OUTP); s3c2410_gpio_cfgpin(S3C2410_GPB6,S3C2410_GPB6_OUTP);}static int io_close(struct inode * inode,struct file * file)//设备关闭函数{free_irq(IRQ_EINT0,1);//释放中断free_irq(IRQ_EINT2,1);//释放中断printk("the device is closed/n");return 0;}static ssize_t io_read(struct file * filp,char * buff,size_t count,loff_t * f_ops)//读取IO端口{wait_event_interruptible(io_wait,flag_0&flag_2);flag_0=0;flag_2=0;//printk("the value is %d/n",io_data);copy_to_user(buff,(char *)&cnt,sizeof(cnt));}static struct file_operations io_device_fops = {.owner=THIS_MODULE,.read=io_read,.open=io_open,.release=io_close,};static int __init io_init(void)//insmod加载驱动时执行{int ret;ret=register_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME,&io_device_fops);if(ret<0){printk("Fail to regist the device/n");return ret;}return 0;}static int __exit io_exit(void)//rmmod卸载驱动时执行{unregister_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME);printk("the device has been unregisted/n");}module_init(io_init);module_exit(io_exit);MODULE_LICENSE("GPL");  

这个驱动实际上是通过红外传感器检测电平变化，来实现人数的统计，改进后能够实现正确的通过中断先后来识别方向，还排除了单一中断的

抖动干扰。