点亮3个led灯和蜂鸣器和风扇

#ifndef __HEAD_H_

#define __HEAD_H_

typedef struct

{

    unsigned int moder;

    unsigned int otyper;

    unsigned int ospeedr;

    unsigned int pupdr;

    unsigned int idr;

    unsigned int odr;

}gpio_t;

#define PHY_LED1 0x50006000

#define PHY_LED2 0x50007000

#define PHY_LED3 0x50006000

#define PHY_RCC 0x50000A28

#define PHY_FAN 0x50006000

#define PHY_BELL 0x50003000

#endif

#include<linux/init.h>

#include<linux/module.h>

#include<linux/fs.h>

#include<linux/uaccess.h>

#include<linux/io.h>

#include<linux/device.h>

#include"ledall.h"

int major;

char kbuf[128]={0};

unsigned int *vir_moder;

struct class *cls;

struct device *dev;

gpio_t *vir_led1;

gpio_t *vir_led2;

gpio_t *vir_led3;

gpio_t *vir_bell;

gpio_t *vir_fan;

unsigned int *vir_rcc;

int mycdev_open(struct inode *inode,struct file *file)

{

    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);

    return 0;

}

ssize_t mycdev_read(struct file *file,char *ubuf,size_t size,loff_t *lof)

{

    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);

    unsigned long ret;

    if(size>sizeof(kbuf))

       {

            size=sizeof(kbuf);

       }

    ret=copy_to_user(ubuf,kbuf,size);

    if(ret)

    {

        printk("copy_to_user failed\n");

        return ret;

    }

    return 0;

}

ssize_t mycdev_write(struct file *file,const char *ubuf,size_t size,loff_t
*lof)

{

   unsigned long ret;

   if(size>sizeof(kbuf))

    {

        size=sizeof(kbuf);

    }

    ret=copy_from_user(kbuf,ubuf,size);

    if(ret)

    {

        printk("copy_from_user failed\n");

        return ret;

    }

    printk("结果是:%s\n",kbuf);

    switch (kbuf[0]){

    case '1':

            if(kbuf[1]=='1')

            vir_led1->odr |=(0x1<<10);

            else if(kbuf[1]=='0')

            vir_led1->odr &=(~(0x1<<10));

            break;

    case '2':

            if(kbuf[1]=='1')

            {

                vir_led2->odr |=(0x1<<10);

            }

            else if(kbuf[1]=='0')

            {

                vir_led2->odr &=(~(0x1<<10));

            }

            break;

    case '3':

            if(kbuf[1]=='1')

            vir_led3->odr |=(0x1<<8);

            else if(kbuf[1]=='0')

            vir_led3->odr &=(~(0x1<<8));

            break;

    case '4':

            if(kbuf[1]=='1')

            (vir_bell->odr) |= (0x1<<6);

            else if(kbuf[1]=='0')

             (vir_bell->odr) &= (~(0x1<<6));

             break;

    case '5':

            if(kbuf[1]=='1')

            (vir_fan->odr) |= (0x1<<9);

            else if(kbuf[1]=='0')

             (vir_fan->odr) &= (~(0x1<<9));

             break;

    }

   

    return 0;

}

int mycdev_close(struct inode *inode,struct file *file)

{

    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);

    return 0;

}

struct file_operations fops={

    .open=mycdev_open,

    .read=mycdev_read,

    .write=mycdev_write,

    .release=mycdev_close,

 

};

static int __init mycdev_init(void)

{

    //字符设备驱动注册

    major=register_chrdev(0,"mychrdev",&fops);

    if(major<0)

    {

        printk("字符设备驱动注册失败\n");

        return major;

    }

    printk("字符设备驱动注册成功:major=%d\n",major);

   

    //向上提交目录

    cls=class_create(THIS_MODULE,"mychrdev");

    if(IS_ERR(cls))

    {

        printk("向上提交目录失败\n");

        return PTR_ERR(cls);

    }

    printk("向上提交目录成功!\n");

    dev=device_create(cls,NULL,MKDEV(major,0),NULL,"mychrdev");

    if(IS_ERR(dev))

    {

        printk("向上提交设备信息失败\n");

        return PTR_ERR(dev);

    }

    printk("向上提交设备信息成功\n");

    //灯的初始化

    vir_led1=ioremap(PHY_LED1,sizeof(gpio_t));

    vir_led2=ioremap(PHY_LED2,sizeof(gpio_t));

    vir_led3=ioremap(PHY_LED3,sizeof(gpio_t));

    vir_rcc=ioremap(PHY_RCC,4);

    vir_bell=ioremap(PHY_BELL,sizeof(gpio_t));

    vir_fan=ioremap(PHY_FAN,sizeof(gpio_t));

    if(vir_led1==NULL)

    {

        printk("ioremap1 failed:%d\n",__LINE__);

        return -ENOMEM;

    }

    if(vir_led2==NULL)

    {

        printk("ioremap2 failed:%d\n",__LINE__);

         return -ENOMEM;

    }

    if(vir_led3==NULL)

    {

        printk("ioremap3 failed:%d\n",__LINE__);

         return -ENOMEM;

    }

     if(vir_rcc==NULL)

    {

        printk("ioremaprcc failed:%d\n",__LINE__);

         return -ENOMEM;

    }

    printk("物理地址映射成功\n");

    //寄存器的初始化

    //GPIOE,GPIOF引脚使能

    *(vir_rcc) |= (0x1<<4);

    *(vir_rcc) |= (0x1<<5);

    //GPIOB引脚使能

    *(vir_rcc) |= (0x1<<1);

    (vir_led1->moder) &= (~(0x3<<20));

    (vir_led1->moder) |= (0x1<<20);

    (vir_led1->odr) &= (~(0x1<<10));

    (vir_led2->moder) &= (~(0x3<<20));

    (vir_led2->moder) |= (0x1<<20);

    (vir_led2->odr) &= (~(0x1<<10));

    (vir_led3->moder) &= (~(0x3<<16));

    (vir_led3->moder) |= (0x1<<16);

    (vir_led3->odr) &= (~(0x1<<8));

    //风扇和蜂鸣器

    (vir_bell->moder) &= (~(0x3<<12));

    (vir_bell->moder) |=(0x1<<12);

    (vir_bell->odr) &= (~(0x1<<6));

     (vir_fan->moder) &= (~(0x3<<18));

    (vir_fan->moder) |=(0x1<<18);

    (vir_fan->odr) &= (~(0x1<<9));

    printk("初始化寄存器成功!\n");

    return 0;

}

static void __exit mycdev_exit(void)

{

    //取消地址映射

    iounmap(vir_led1);

    iounmap(vir_led2);

    iounmap(vir_led3);

    iounmap(vir_rcc);

    //销毁设备信息

     device_destroy(cls,MKDEV(major,0));

    //销毁目录

    class_destroy(cls);

    //注销字符设备驱动

    unregister_chrdev(major,"mychrdev");

}

module_init(mycdev_init);

module_exit(mycdev_exit);

MODULE_LICENSE("GPL");

#include<stdlib.h>

#include<stdio.h>

#include<sys/types.h>

#include<sys/stat.h>

#include<fcntl.h>

#include<unistd.h>

#include<string.h>

int main(int argc,char const *argv[])

{

    char buf[128]={0};

    int fd=open("/dev/mychrdev",O_RDWR);

    if(fd<0)

    {

        printf("打开设备失败\n");

        exit(-1);

    }

    while(1)

    {

        printf("请输入两个字符\n");

        fgets(buf,sizeof(buf),stdin);

        buf[strlen(buf)-1]='\0';

          write(fd,buf,sizeof(buf));

         }

   

    close(fd);

    return 0;

}

技术
今日推荐
PPT
阅读数 109
下载桌面版
GitHub
百度网盘(提取码:draw)
Gitee
云服务器优惠
阿里云优惠券
腾讯云优惠券
华为云优惠券
站点信息
问题反馈
邮箱:ixiaoyang8@qq.com
QQ群:766591547
关注微信