控制LED灯的亮灭
head.h
#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
test.c
#include <stdio.h>
#include <stdlib.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");
exit(-1);
}
while(1)
{
printf("请输入控制命令--11:LED1开灯 10:LED1关灯\n21:LED2开灯 20:LED2关灯\n31:LED3开灯 30:LED3关灯>>>");
fgets(buf,sizeof(buf),stdin); //在终端读取
buf[strlen(buf)-1] = '\0';
write(fd,buf,sizeof(buf));
}
close(fd);
return 0;
}
mychrdev.c
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include "head.h"
int major; //用于保存主设备号
char kbuf[128] = {0};
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)
{
int ret;
if(sizeof(kbuf) < size)
size = sizeof(kbuf);
ret = copy_to_user(ubuf,kbuf,size);
if(ret)
{
printk("copy to user filed\n");
return -EIO;
}
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
return 0;
}
ssize_t mycdev_write(struct file *file,const char *ubuf,size_t size,loff_t *lof)
{
int ret;
if(sizeof(kbuf) < size)
size = sizeof(kbuf);
ret = copy_from_user(kbuf,ubuf,size);
if(ret)
{
printk("copy from user filed\n");
return -EIO;
}
//LED1亮
if(kbuf[0]=='1' && kbuf[1]=='1')
{
(*vir_led1_odr) |= (0x1 << 10);
}
//LED1灭
else if(kbuf[0]=='1' && kbuf[1]=='0')
{
(*vir_led1_odr) &= (~(0x1 << 10));
}
//LED2亮
if(kbuf[0]=='2' && kbuf[1]=='1')
{
(*vir_led2_odr) |= (0x1 << 10);
}
//LED2灭
else if(kbuf[0]=='2' && kbuf[1]=='0')
{
(*vir_led2_odr) &= (~(0x1 << 10));
}
//LED3亮
if(kbuf[0]=='3' && kbuf[1]=='1')
{
(*vir_led3_odr) |= (0x1 << 8);
}
//LED3灭
else if(kbuf[0]=='3' && kbuf[1]=='0')
{
(*vir_led3_odr) &= (~(0x1 << 8));
}
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
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变量并完成初始化
struct file_operations fops =
{
.open = mycdev_open,
.read = mycdev_read,
.write = mycdev_write,
.release = mycdev_close,
};
static int __init mycdev_init(void)
{
//字符设备启动注册
major = register_chrdev(0,"mychrdev",&fops);
if (major < 0)
{
printk("字符驱动设备注册失败\n");
return major;
}
printk("字符驱动注册成功major = %d\n",major);
//映射物理寄存器
vir_led1_moder = ioremap(PHY_LED1_MODER,4);
if(vir_led1_moder==NULL)
{
printk("MODER寄存器地址映射失败\n");
return -EFAULT;
}
vir_led1_odr = ioremap(PHY_LED1_ODR,4);
if(vir_led1_odr==NULL)
{
printk("ODR寄存器地址映射失败\n");
return -EFAULT;
}
vir_led2_moder = ioremap(PHY_LED2_MODER,4);
if(vir_led2_moder==NULL)
{
printk("MODER寄存器地址映射失败\n");
return -EFAULT;
}
vir_led2_odr = ioremap(PHY_LED2_ODR,4);
if(vir_led2_odr==NULL)
{
printk("ODR寄存器地址映射失败\n");
return -EFAULT;
}
vir_led3_moder = ioremap(PHY_LED3_MODER,4);
if(vir_led3_moder==NULL)
{
printk("MODER寄存器地址映射失败\n");
return -EFAULT;
}
vir_led3_odr = ioremap(PHY_LED3_ODR,4);
if(vir_led3_odr==NULL)
{
printk("ODR寄存器地址映射失败\n");
return -EFAULT;
}
vir_rcc = ioremap(PHY_RCC,4);
if(vir_rcc==NULL)
{
printk("MODER寄存器地址映射失败\n");
return -EFAULT;
}
printk("寄存器地址映射成功\n");
//寄存器初始化
(*vir_rcc) |= (0x1 << 4);
(*vir_rcc) |= (0x1 << 5);
(*vir_led1_moder) &= (~(0x3 << 20));
(*vir_led1_moder) |= (0x1 << 20);
(*vir_led1_odr) &= (~(0x1 << 10));
(*vir_led2_moder) &= (~(0x3 << 20));
(*vir_led2_moder) |= (0x1 << 20);
(*vir_led2_odr) &= (~(0x1 << 10));
(*vir_led3_moder) &= (~(0x3 << 16));
(*vir_led3_moder) |= (0x1 << 16);
(*vir_led3_odr) &= (~(0x1 << 8));
return 0;
}
static void __exit mycdev_exit(void)
{
//取消寄存器地址映射
iounmap(vir_led1_moder);
iounmap(vir_led1_odr);
iounmap(vir_led2_moder);
iounmap(vir_led2_odr);
iounmap(vir_led3_moder);
iounmap(vir_led3_odr);
iounmap(vir_rcc);
//字符设备驱动的注销
unregister_chrdev(major,"mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");
效果展示
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文章来源:https://www.toymoban.com/news/detail-531706.html
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