head.h

#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_ADDR 0X50006000
#define PHY_LED2_ADDR    0X50007000
#define PHY_LED3_ADDR 0X50006000
#define PHY_RCC_ADDR    0X50000A28
#endif 

mychrdev.c

#include <linux/init.h>
#include <linux/module.h>
#include<linux/fs.h>
#include<linux/io.h>
#include"head.h"

int major;
char kbuf[128]={0};
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
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;
    //向用戶空間讀取拷貝
    if(size>sizeof(kbuf))//用戶空間期待讀取的大小內(nèi)核滿足不了，那就給內(nèi)核支持的最大大小
        size=sizeof(kbuf);
    ret=copy_to_user(ubuf,kbuf,size);
    if(ret)//拷貝失敗
    {
        printk("copy_to_user filed\n");
        return ret;
    }
    return 0;
}
ssize_t mycdev_write(struct file *file, const char  *ubuf, size_t size, loff_t *lof)
{
    unsigned long ret;
    //從用戶空間讀取數(shù)據(jù)
    if(size>sizeof(kbuf))//用戶空間期待讀取的大小內(nèi)核滿足不了，那就給內(nèi)核支持的最大大小
        size=sizeof(kbuf);
    ret=copy_from_user(kbuf,ubuf,size);
    if(ret)//拷貝失敗
    {
        printk("copy_to_user filed\n");
        return ret;
    }
    switch(kbuf[0]){
        case '1'://LED1
            if(kbuf[1]=='0')//關(guān)燈
                vir_led1->ODR &= (~(1<<10));
            else//開(kāi)燈
                vir_led1->ODR |= 1<<10;
            break;
        case '2'://LED2
            if(kbuf[1]=='0')//關(guān)燈
                vir_led2->ODR &= (~(1<<10));
            else//開(kāi)燈
                vir_led2->ODR |= 1<<10;
            break;
        case '3'://LED3
            if(kbuf[1]=='0')//關(guān)燈
                vir_led3->ODR &= (~(1<<8));
            else//開(kāi)燈
                vir_led3->ODR |= 1<<8;
            break;
    }
    return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    return 0;
}

//定義操作方法結(jié)構(gòu)體變量并賦值
struct file_operations fops={

    .open=mycdev_open,
    .read=mycdev_read,
    .write=mycdev_write,
    .release=mycdev_close,
};

int all_led_init(void)
{
    //寄存器地址的映射
    vir_led1=ioremap(PHY_LED1_ADDR,sizeof(gpio_t));
    if(vir_led1==NULL)
    {
        printk("ioremap filed：%d\n",__LINE__);
        return -ENOMEM;
    }
     vir_led2=ioremap(PHY_LED2_ADDR,sizeof(gpio_t));
    if(vir_led2==NULL)
    {
        printk("ioremap filed：%d\n",__LINE__);
        return -ENOMEM;
    }
     vir_led3=vir_led1;
    vir_rcc=ioremap(PHY_RCC_ADDR,4);
    if(vir_rcc==NULL)
    {
        printk("ioremap filed：%d\n",__LINE__);
        return -ENOMEM;
    }
    printk("物理地址映射成功\n");
    //寄存器的初始化
    //rcc
    (*vir_rcc) |= (3<<4);
    //led1
    vir_led1->MODER &= (~(3<<20));
    vir_led1->MODER |= (1<<20);
    vir_led1->ODR &= (~(1<<10));
    //led2
    vir_led2->MODER &= (~(3<<20));
    vir_led2->MODER |= (1<<20);
    vir_led2->ODR &= (~(1<<10));
    //led3
    vir_led3->MODER &= (~(3<<16));
    vir_led1->MODER |= (1<<16);
    vir_led1->ODR &= (~(1<<8));
    printk("寄存器初始化成功\n");

    return 0;
}

static int __init mycdev_init(void)
{
    //字符設(shè)備驅(qū)動(dòng)注冊(cè)
    major=register_chrdev(0,"mychrdev",&fops);
    if(major<0)
    {
        printk("字符設(shè)備驅(qū)動(dòng)注冊(cè)失敗\n");
        return major;
    }
    printk("字符設(shè)備驅(qū)動(dòng)注冊(cè)成功:major=%d\n",major);
    //寄存器映射以及初始化
    all_led_init();

    return 0;
}
static void __exit mycdev_exit(void)
{
    //取消地址映射
    iounmap(vir_led1);
    iounmap(vir_led2);
    iounmap(vir_rcc);
    //注銷字符設(shè)備驅(qū)動(dòng)
    unregister_chrdev(major,"mychrdev");


}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

led.c文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-606499.html

#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("打開(kāi)設(shè)備文件失敗\n");
        exit(-1);
    }
    while(1)
    {
        //從終端讀取
        printf("請(qǐng)輸入兩個(gè)字符\n");
        printf("第一個(gè)字符:1(LED1) 2(LED2) 3(LED3)\n");
        printf("第二個(gè)字符:0(關(guān)燈) 1(開(kāi)燈)\n");
        printf("請(qǐng)輸入>");
        fgets(buf,sizeof(buf),stdin);
        buf[strlen(buf)-1]='\0';
        //向設(shè)備文件中寫
        write(fd,buf,sizeof(buf));
    }

    
    close(fd);

    return 0;
}

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