驱动开发day1

头文件

#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

demo1.c

#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]={};
//定义指针指向映射后的虚拟内存
unsigned int *vir_moder1;
unsigned int *vir_odr1;
unsigned int *vir_moder2;
unsigned int *vir_odr2;
unsigned int *vir_moder3;
unsigned int *vir_odr3;
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[1] == '0'){// 关灯逻辑if (kbuf[0] == '1')(*vir_odr1) &= (~(0X1<<10));else if (kbuf[0] == '2')(*vir_odr2) &= (~(0X1<<10));else if (kbuf[0] == '3')(*vir_odr3) &= (~(0X1<<8));}else if (kbuf[1] == '1'){// 开灯逻辑if (kbuf[0] == '1')(*vir_odr1) |= (0X1<<10);else if (kbuf[0] == '2')(*vir_odr2) |= (0X1<<10);else if (kbuf[0] == '3')(*vir_odr3) |= (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,
};//入口函数，安装内核模块时执行
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");}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_moder1 = ioremap(PHY_LED1_MODER, 4);if (vir_moder1 == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}vir_odr1 = ioremap(PHY_LED1_ODR, 4);if (vir_odr1 == 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_moder1) &= (~(0X3<<20));//MODER[21:20]->00(*vir_moder1) |= (0X1<<20);//MODER[21:20]->01(*vir_odr1) &= (~(0X1<<10));//默认关灯vir_moder2 = ioremap(PHY_LED2_MODER, 4);if (vir_moder2 == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}vir_odr2 = ioremap(PHY_LED2_ODR, 4);if (vir_odr2 == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}//LED2(*vir_moder2) &= (~(0X3<<20));//MODER[21:20]->00(*vir_moder2) |= (0X1<<20);//MODER[21:20]->01(*vir_odr2) &= (~(0X1<<10));//默认关灯vir_moder3 = ioremap(PHY_LED3_MODER, 4);if (vir_moder3 == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}vir_odr3 = ioremap(PHY_LED3_ODR, 4);if (vir_odr3 == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}//LED3(*vir_moder3) &= (~(0X3<<16));//MODER[21:20]->00(*vir_moder3) |= (0X1<<16);//MODER[21:20]->01(*vir_odr3) &= (~(0X1<<8));//默认关灯return 0;
}//出口函数，卸载内核模块时执行
static void __exit mycdev_exit(void)
{//取消内存映射iounmap(vir_moder1);iounmap(vir_odr1);iounmap(vir_moder2);iounmap(vir_odr2);iounmap(vir_moder3);iounmap(vir_odr3);iounmap(vir_rcc);//注销字符设备驱动unregister_chrdev(major,"mychrdev");
}//用于声明入口函数
module_init(mycdev_init);
//用于声明出口函数
module_exit(mycdev_exit);
//声明当前内核模块遵循GPL协议
MODULE_LICENSE("GPL");

text.c

#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);buf[strlen(buf)-1] = '\0';//调用writewrite(fd, buf, sizeof(buf));//memset(buf, 0, sizeof(buf));//read(fd, buf, sizeof(buf));//printf("buf:%s\n",buf);}//调用closeclose(fd);return 0;
}