作业来了~~~
- 开源代码
- 2025-08-16 10:27:03
#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
