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作业来了~~~

news 来源：原创 2025/5/2 0:08:35

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include<linux/io.h>
#include "head.h"
unsigned int major;
char kbuf[128] = {};
// 定义三个指针指向映射后的虚拟内存
unsigned int *vir_led1_moder;
unsigned int *vir_led1_odr;
unsigned int *vir_led2_moder;
unsigned int *vir_led2_odr;
unsigned int *vir_led3_moder;
unsigned int *vir_led3_odr;
unsigned int *vir_rcc;
// 封装操作方法
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__);
int ret;
ret = copy_to_user(ubuf, kbuf, size);
if (ret)
{
printk("copy_to_user filed\n");
return -EIO;
}
return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *lof)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
int ret;
ret = copy_from_user(kbuf, ubuf, size);
if (ret)
{
printk("copy_from_user filed\n");
return -EIO;
}
if (kbuf[0] == '0') // 关灯
{
// 关灯逻辑
(*vir_led1_odr) &= (~(0X1<<10));//默认关灯
       (*vir_led2_odr) &=(~(0x1<<10));
       (*vir_led3_odr) &=(~(0x1<<8));
}
else if (kbuf[0] == '1')
{
// 开灯逻辑
(*vir_led1_odr) |= (0X1<<10);
       (*vir_led2_odr) |= (0x1<<10);
       (*vir_led3_odr) |= (0x1<<8);
}
return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
// 定义操作方法结构体对象
struct file_operations fops = {
.open = mycdev_open,
.read = mycdev_read,
.write = mycdev_write,
.release = mycdev_close,
};
static int __init mycdev_init(void)
{
// 注册字符设备驱动
major = register_chrdev(0, "mychrdev", &fops);
if (major < 0)
{
printk("字符设备驱动注册失败\n");
return major;
}
printk("注册字符设备驱动成功major=%d\n", major);
// 进行寄存器的地址映射
vir_led1_moder = ioremap(PHY_LED1_MODER, 4);
if (vir_led1_moder == NULL)
{
printk("物理内存地址映射失败%d\n", __LINE__);
return -EFAULT;
}
vir_led1_odr = ioremap(PHY_LED1_ODR, 4);
if (vir_led1_odr == NULL)
{
printk("物理内存地址映射失败%d\n", __LINE__);
return -EFAULT;
}

vir_led2_moder = ioremap(PHY_LED2_MODER, 4);
if (vir_led2_moder == NULL)
{
printk("物理内存地址映射失败%d\n", __LINE__);
return -EFAULT;
}
vir_led2_odr = ioremap(PHY_LED2_ODR, 4);
if (vir_led2_odr == NULL)
{
printk("物理内存地址映射失败%d\n", __LINE__);
return -EFAULT;
}

vir_led3_moder = ioremap(PHY_LED3_MODER, 4);
if (vir_led3_moder == NULL)
{
printk("物理内存地址映射失败%d\n", __LINE__);
return -EFAULT;
}
vir_led3_odr = ioremap(PHY_LED3_ODR, 4);
if (vir_led3_odr == NULL)
{
printk("物理内存地址映射失败%d\n", __LINE__);
return -EFAULT;
}

vir_rcc = ioremap(PHY_RCC, 4);
if (vir_rcc == NULL)
{
printk("物理内存地址映射失败%d\n", __LINE__);
return -EFAULT;
}
printk("寄存器内存映射成功\n");
//LED1寄存器初始化
(*vir_rcc) |= (0X3<<4);//GPIOE控制器时钟使能
(*vir_led1_moder) &= (~(0X3<<20));//MODER[21:20]->00
(*vir_led1_moder) |= (0X1<<20);//MODER[21:20]->01
(*vir_led1_odr) &= (~(0X1<<10));//默认关灯
   //LED2寄存器初始化
   (*vir_led2_moder) &=(~(0x3<<20));
   (*vir_led2_moder) |= (0x1<<20);
(*vir_led2_odr) &= (~(0X1<<10));//默认关灯
   //LED3寄存器初始化
   (*vir_led3_moder) &= (~(0x3<<16));
   (*vir_led3_moder) |= (0x1<<16);
   (*vir_led3_odr) &= (~(0X1<<8));//默认关灯
return 0;
}
static void __exit mycdev_exit(void)
{
//取消内存映射
iounmap(vir_led1_moder);
iounmap(vir_led1_odr);
iounmap(vir_rcc);
//取消内存映射
iounmap(vir_led2_moder);
iounmap(vir_led2_odr);
//取消内存映射
iounmap(vir_led3_moder);
iounmap(vir_led3_odr);

// 注销字符设备驱动
unregister_chrdev(major, "mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

#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("打开设备文件失败\n");
return -1;
}
printf("打开设备文件成功\n");
while (1)
{
printf("请输入要进行的操作：0（关灯）1（开灯）>");
fgets(buf, sizeof(buf), stdin); // 在终端读一个字符串
buf[strlen(buf) - 1] = '\0';
write(fd, buf, sizeof(buf)); // 将数据传递给内核
}
close(fd);
return 0;
}

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

#define PHY_LED2_MODER 0x50007000
#define PHY_LED2_ODR 0x50007014

#define PHY_LED3_MODER 0X50006000
#define PHY_LED3_ODR 0x50006014

#define PHY_RCC 0x50000A28

#endif