驱动控制led灯

myled.h

#ifndef __MYLED_H__
#define __MYLED_H__

typedef struct {
    volatile unsigned int MODER;   // 0x00
    volatile unsigned int OTYPER;  // 0x04
    volatile unsigned int OSPEEDR; // 0x08
    volatile unsigned int PUPDR;   // 0x0C
    volatile unsigned int IDR;     // 0x10
    volatile unsigned int ODR;     // 0x14
    volatile unsigned int BSRR;    // 0x18                                                                        
    volatile unsigned int LCKR;    // 0x1C 
    volatile unsigned int AFRL;    // 0x20 
    volatile unsigned int AFRH;    // 0x24
    volatile unsigned int BRR;     // 0x28
    volatile unsigned int res;
    volatile unsigned int SECCFGR; // 0x30

}gpio_t;
#define RCC_PHY_ADDR 0x50000A28 //rcc物理地址
#define  GPIOE  0x50006000
#define  GPIOF  0x50007000
#endif

test.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
int main(int argc,const char * argv[])
{
    int fd = -1;
    char buf[128]="";
    fd = open("/dev/myled",O_RDWR);
    if(fd==-1)
    {
        perror("open is error\n");
        exit(1);
    }
   while (1)
   {
    buf[0]=0;
    buf[1] = !buf[1];
    write(fd,buf,sizeof(buf));
    buf[0]=1;
    write(fd,buf,sizeof(buf));
    buf[0]=2;
    write(fd,buf,sizeof(buf));
    sleep(1);
   }
    close(fd);
    return 0;
}

mycdev.c

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include "myled.h"
#define CNAME "myled"

int major = 0;
char kbuf[128]="";
unsigned int* rcc_virt = NULL;
gpio_t* gpioe = NULL;
gpio_t* gpiof = NULL;
int myled_open (struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    return 0;
}
ssize_t myled_read (struct file *file, char __user *ubuf, size_t size, loff_t *loffs)
{
    int ret;
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    if(size > sizeof(kbuf)) size = sizeof(kbuf);
    ret = copy_to_user(ubuf,kbuf,sizeof(kbuf));
    if(ret)
    {
        printk("copy to user error\n");
        return -EIO;
    }
    return size;
}
ssize_t myled_write (struct file *file, const char __user *ubuf, size_t size, loff_t *loffs)
{
    int ret;
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    if(size>sizeof(kbuf)) size = sizeof(kbuf);
    ret = copy_from_user(kbuf,ubuf,size);
    if(ret)
    {
        printk("copy from user error\n");
        return -EIO;
    }
    switch (kbuf[0])
    {
    case 0:
        if(kbuf[1])
        {
            //灭
           gpioe->ODR &=(~(0x1<<10));
        }else{
            //亮
            gpioe->ODR |=(0x1<<10);
        }
        break;
    case 1:
         if(kbuf[1])
        {
            //灭
           gpioe->ODR &=(~(0x1<<8));
        }else{
            //亮
            gpioe->ODR |=(0x1<<8);
        }
        break;
    case 2:
        if(kbuf[1])
        {
            //灭
           gpiof->ODR &=(~(0x1<<10));
        }else{
            //亮
           gpiof->ODR |=(0x1<<10);
        }
        break;
    default:
        break;
    }
    memset(kbuf,0,sizeof(kbuf));
    return size;
}
int myled_close (struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    return 0;
}
const struct file_operations fops = {
    .open = myled_open,
    .read = myled_read,
    .write = myled_write,
    .release = myled_close,
};
//入口
static int __init mycdev_init(void)
{
    major = register_chrdev(0,CNAME,&fops);
    if(major <=0)
    {
        printk("register chrdev is error\n");
    }
    printk("major = %d\n",major);

    rcc_virt = ioremap(RCC_PHY_ADDR,4);
    if(rcc_virt ==NULL)
    {
        printk("rcc_virt ioremap is error\n");
        return -EIO;
    }
    gpioe = ioremap(GPIOE,sizeof(gpio_t));
    if(gpioe ==NULL)
    {
        printk("gpioe is error\n");
        return -EIO;
    }
    gpiof = ioremap(GPIOF,sizeof(gpio_t));
    if(gpiof ==NULL)
    {
        printk("gpiof is error\n");
        return -EIO;
    }
    //初始化
    *rcc_virt |=(0x3<<4);
    gpioe->MODER &=(~(0x3<<20));//PE10
    gpioe->MODER |=(0X1<<20);
    gpioe->ODR &=(~(0X1<<10));
    gpioe->MODER &=(~(0x3<<16));//PE8
    gpioe->MODER |=(0X1<<16);
    gpioe->ODR &=(~(0X1<<8));
    gpiof->MODER &=(~(0x3<<20));//PF10
    gpiof->MODER |=(0X1<<20);
    gpiof->ODR &=(~(0X1<<10));
    return 0;
}

//出口
static void __exit mycdev_exit(void)
{
    unregister_chrdev(major,CNAME);
    iounmap(rcc_virt);
    iounmap(gpioe);
    iounmap(gpiof);
}
//指定地址
module_init(mycdev_init);
module_exit(mycdev_exit);
//gpl
MODULE_LICENSE("GPL");