实现三盏灯的控制，编写应用程序测试
head.h
#ifndef __HEAD_H__
#define __HEAD_H__
#define LED1_MODER 0X50006000
#define LED1_ODR 0X50006014
#define LED1_RCC 0X50000A28
#define LED2_MODER 0X50007000
#define LED2_ODR 0X50007014
#endifmychrdev.c
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include "head.h"
//保存主设备号
unsigned int major;
char kbuf[128]={0};
unsigned int* vir_moder;
unsigned int* vir_odr;
unsigned int* vir_rcc;
unsigned int* vir_moder_F;
unsigned int* vir_odr_F;
//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)
{
int ret;
ret=copy_to_user(ubuf,kbuf,size);
if(ret)
{
printk("copy_to_user err\n");
return -EIO;
}
return 0;
}
ssize_t mycdev_write(struct file* file,const char *ubuf,size_t size,loff_t *lof)
{
int ret;
ret=copy_from_user(kbuf,ubuf,size);
if(ret)
{
printk("copy_from_user err\n");
return -EIO;
}
if(kbuf[0]=='1')
{
//开灯逻辑
if(kbuf[1]=='1')
{
(*vir_odr) |= (0x1<<10);
}
else if(kbuf[1]=='2')
{
(*vir_odr_F) |= (0x1<<10);
}
else if(kbuf[1]=='3')
{
(*vir_odr) |= (0x1<<8);
}
}
else if(kbuf[0]=='0')
{
//关灯逻辑
if(kbuf[1]=='1')
{
(*vir_odr) &= (~(0x1<<10));
}
else if(kbuf[1]=='2')
{
(*vir_odr_F) &= (~(0x1<<10));
}
else if(kbuf[1]=='3')
{
(*vir_odr) &= (~(0x1<<8));
}
}
return 0;
}
int mycdev_close(struct inode* inode,struct file* file)
{
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
return 0;
}
//定义一个操作方式结构体对象并初始化
struct file_operations fops = {
.open=mycdev_open,
.read=mycdev_read,
.write=mycdev_write,
.release=mycdev_close,
};
static int __init mycdev_init(void)
{
//字符设备驱动的注册
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);
//进行相关寄存器的内存映射
vir_odr=ioremap(LED1_ODR,4);
if(vir_odr==NULL)
{
printk("物理内存映射失败%d\n",__LINE__);
return -EFAULT;
}
vir_rcc=ioremap(LED1_RCC,4);
if(vir_rcc==NULL)
{
printk("物理内存映射失败%d\n",__LINE__);
return -EFAULT;
}
vir_moder=ioremap(LED1_MODER,4);
if(vir_moder==NULL)
{
printk("物理内存映射失败%d\n",__LINE__);
return -EFAULT;
}
printk("寄存器内存映射成功\n");
vir_moder_F=ioremap(LED2_MODER,4);
if(vir_moder_F==NULL)
{
printk("物理内存映射失败%d\n",__LINE__);
return -EFAULT;
}
printk("寄存器内存映射成功\n");
vir_odr_F=ioremap(LED2_ODR,4);
if(vir_odr_F==NULL)
{
printk("物理内存映射失败%d\n",__LINE__);
return -EFAULT;
}
printk("寄存器内存映射成功\n");
//硬件寄存器的初始化
//RCC使能
(*vir_rcc) |= (0x1<<4);
(*vir_rcc) |= (0x1<<5);
//设置PE10为输出
(*vir_moder) &= (~(0x3<<20));
(*vir_moder) |= (0x1<<20);
//设置PF8为输出
(*vir_moder_F) &= (~(0x3<<20));
(*vir_moder_F) |= (0x1<<20);
//设置PE8为输出
(*vir_moder) &= (~(0x3<<16));
(*vir_moder) |= (0x1<<16);
//默认关灯
(*vir_odr) &= (~(0X1<<10));
(*vir_odr_F) &= (~(0X1<<10));
(*vir_odr) &= (~(0X1<<8));
return 0;
}
static void __exit mycdev_exit(void)
{
//取消物理内存映射
iounmap(vir_moder);
iounmap(vir_odr);
iounmap(vir_rcc);
iounmap(vir_moder_F);
iounmap(vir_odr_F);
//字符设备驱动的注销
unregister_chrdev(major,"mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");test.c
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.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("设备文件打开失败\n");
exit(-1);
}
while(1)
{
memset(buf,0,sizeof(buf));
printf("请输入对LED1的控制命令11(开灯) 01(关灯)>>>");
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1]='\0';
write(fd,buf,sizeof(buf));
memset(buf,0,sizeof(buf));
printf("请输入对LED2的控制命令12(开灯) 02(关灯)>>>");
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1]='\0';
write(fd,buf,sizeof(buf));
memset(buf,0,sizeof(buf));
printf("请输入对LED3的控制命令13(开灯) 03(关灯)>>>");
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1]='\0';
write(fd,buf,sizeof(buf));
}
close(fd);
}
测试过程及现象：
1.编译>>>
2.测试>>>
3.现象>>>
