head.h
#ifndef __HEAD_H__
#define __HEAD_H__
#define PHY_LED1_RCC 0X50000A28
//PE10
#define PHY_LED1_MODER 0X50006000
#define PHY_LED1_ODR 0X50006014
//PF10
#define PHY_LED2_MODER 0X50007000
#define PHY_LED2_ODR 0X50007014
//PE8
#define PHY_LED3_MODER 0X50006000
#define PHY_LED3_ODR 0X50006014
#endif
test.c
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.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");
exit(-1);
}
while (1)
{
printf("请输入控制命令:0(关灯)1(开灯)>");
fgets(buf, sizeof(buf), stdin); // 从终端输入数据到buf
buf[strlen(buf) - 1] = '\0'; // 将buf末尾的'\n'切换为'\0'
write(fd, buf, sizeof(buf));
}
close(fd);
return 0;
}
mychrdev.c文章来源:https://www.toymoban.com/news/detail-604664.html
#include <linux/init.h>
#include <linux/module.h>
#include<linux/fs.h>
#include<linux/io.h>
#include"head.h"
unsigned int major;//定义一个变量保存主设备号
char kbuf[128]={0};
unsigned int *vir_moder;
unsigned int *vir_odr;
unsigned int *vir_rcc;
unsigned int *vir_moder1;
unsigned int *vir_odr1;
unsigned int *vir_moder2;
unsigned int *vir_odr2;
//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__);
long 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__);
long ret;
ret=copy_from_user(kbuf,ubuf,size);
if(ret)
{
printk("copy_from_user filed\n");
return -EIO;
}
//判断用户输入的数据,进行不同的硬件逻辑执行
if(kbuf[0]=='0')//关灯
{
//关灯逻辑
(*vir_odr) &= (~(0X1<<10));
(*vir_odr1) &= (~(0X1<<10));
(*vir_odr2) &= (~(0X1<<8));
}
else if(kbuf[0]=='1')
{
//开灯逻辑
(*vir_odr) |=(0X1<<10);
(*vir_odr1) |=(0X1<<10);
(*vir_odr2) |=(0X1<<8);
}
return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
return 0;
}
//定义一个操作方法结构体变量并且初始化
struct file_operations fops={
.open=mycdev_open,
.release=mycdev_close,
.read=mycdev_read,
.write=mycdev_write,
};
static int __init mycdev_init(void)
{
//注册字符设备驱动
major=register_chrdev(0,"mychrdev",&fops);
if(major<0)
{
printk("注册字符设备驱动失败\n");
return major;
}
printk("注册字符设备驱动成功major=%d\n",major);
//进行寄存器地址的映射
vir_moder=ioremap(PHY_LED1_MODER,4);
if(vir_moder==NULL)
{
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
vir_odr=ioremap(PHY_LED1_ODR,4);
if(vir_odr==NULL)
{
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
vir_rcc=ioremap(PHY_LED1_RCC,4);
if(vir_rcc==NULL)
{
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
printk("映射物理内存成功\n");
//进行寄存器地址的映射
vir_moder1=ioremap(PHY_LED2_MODER,4);
if(vir_moder1==NULL)
{
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
vir_odr1=ioremap(PHY_LED2_ODR,4);
if(vir_odr1==NULL)
{
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
printk("映射物理内存成功\n");
//进行寄存器地址的映射
vir_moder2=ioremap(PHY_LED3_MODER,4);
if(vir_moder2==NULL)
{
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
vir_odr2=ioremap(PHY_LED3_ODR,4);
if(vir_odr2==NULL)
{
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
printk("映射物理内存成功\n");
//硬件寄存器的初始化
(*vir_rcc)|=(0X1<<4);//rcc使能
(*vir_moder) &=(~(0X3<<20));//设置为输出
(*vir_moder) |=(0X1<<20);
(*vir_odr) &= (~(0X1<<10));//输出低电平
//硬件寄存器的初始化
(*vir_rcc)|=(0X1<<5);//rcc使能
(*vir_moder1) &=(~(0X3<<20));//设置为输出
(*vir_moder1) |=(0X1<<20);
(*vir_odr1) &= (~(0X1<<10));//输出低电平
//硬件寄存器的初始化
(*vir_moder2) &=(~(0X3<<16));//设置为输出
(*vir_moder2) |=(0X1<<16);
(*vir_odr2) &= (~(0X1<<8));//输出低电平
printk("硬件寄存器初始化成功\n");
return 0;
}
static void __exit mycdev_exit(void)
{
//注销字符设备驱动
unregister_chrdev(major,"mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");
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