实现底层实现三盏灯的控制

head.h

#ifndef __HEAD_H__
#define __HEAD_H__
 
#define PHY_LED1_MODER 0X50006000
#define PHY_LED1_ODR   0X50006014

#define PHY_RCC        0X50000A28
 

#define PHY_LED2_MODER 0X50007000
#define PHY_LED2_ODR   0X50007014



#endif

led.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

int main(int argc,const char * argv[])
{
    char buf[128] = {0};
    int fd = open("/dev/mychrdev",O_RDWR);
    if(fd < 0)
    {
        printf("打开设备文件失败\n");
        exit(-1);
    }
    while(1)
    {
        printf("前请输入控制命令---1:开灯  0:关灯>");
        fgets(buf, sizeof(buf), stdin);
        buf[strlen(buf) - 1] = '\0';
        write(fd, buf, sizeof(buf));

    }
    close(fd);
    return 0;
}

mychrdev.c

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

int major;
char kbuf[128] = {0};
//LED1
unsigned int *vir_moder;
unsigned int *vir_odr;
unsigned int *vir_rcc;

//LED2
unsigned int *vir_moder2;
unsigned int *vir_odr2;



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)
{
    int ret;
    if(sizeof(kbuf) < size)
    size = sizeof(kbuf);
    ret = copy_to_user(ubuf, kbuf, size);
    if(ret)
    {
        printk("copy_to_user filed\n");
        return -EIO;
    }
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *loof)
{
    int ret;
    if(sizeof(kbuf) < size)
    size = sizeof(kbuf);
    ret = copy_from_user(kbuf, ubuf, size);
    if(ret)
    {
        printk("copy_from_user filed\n");
        return -EIO;
    }
    if(kbuf[0] == '1')
    {
        (*vir_odr) |= (0x1<<10);
        (*vir_odr2) |= (0x1<<10);
        (*vir_odr) |= (0x1<<8);
    }
    else if(kbuf[0] == '0')
    {
        (*vir_odr) &= (~(0x1<<10));
        (*vir_odr2) &= (~(0x1<<10));
        (*vir_odr) &= (~(0x1<<8));
    }
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    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)
{
    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);

    //LED1 
    vir_moder = ioremap(PHY_LED1_MODER,4);
    if(vir_moder == NULL)
    {
        printk("MODER寄存器地址映射表失败\n");
        return -EFAULT;
    }
    vir_odr = ioremap(PHY_LED1_ODR,4);
    if(vir_odr == NULL)
    {
        printk("ODR寄存器地址映射表失败\n");
        return -EFAULT;
    }
    vir_rcc = ioremap(PHY_RCC,4);
    if(vir_rcc == NULL)
    {
        printk("RCC寄存器地址映射失败\n");
        return -EFAULT;
    }

    //LED2
     vir_moder2 = ioremap(PHY_LED2_MODER,4);
    if(vir_moder2 == NULL)
    {
        printk("MODER寄存器地址映射表失败\n");
        return -EFAULT;
    }
    vir_odr2 = ioremap(PHY_LED2_ODR,4);
    if(vir_odr2 == NULL)
    {
        printk("ODR寄存器地址映射表失败\n");
        return -EFAULT;
    }
   
    printk("寄存器地址映射成功\n");
    //led1
    (*vir_rcc) |= (0x1<<4);
    (*vir_moder) &= (~(0x3<<20));
    (*vir_moder) |= (0x1<<20);
    (*vir_odr) &= (~(0x1<<10));


    //led2
    (*vir_rcc) |= (0x1<<5);
    (*vir_moder2) &= (~(0x3<<20));
    (*vir_moder2) |= (0x1<<20);
    (*vir_odr2) &= (~(0x1<<10));

    //led3
    (*vir_moder) &= (~(0x3<<16));
    (*vir_moder) |= (0x1<<16);
    (*vir_odr) &= (~(0x1<<8));

    printk("硬件寄存器初始化成功\n");

    return 0;
}
static void __exit mycdev_exit(void)
{
    iounmap(vir_moder);
    iounmap(vir_odr);
    iounmap(vir_rcc);
    iounmap(vir_moder2);
    iounmap(vir_odr2);

    unregister_chrdev(major,"mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

效果图片