4月19日驱动开发
点亮3个led灯和蜂鸣器和风扇
#ifndef __HEAD_H_
#define __HEAD_H_
typedef struct
{
unsigned int moder;
unsigned int otyper;
unsigned int ospeedr;
unsigned int pupdr;
unsigned int idr;
unsigned int odr;
}gpio_t;
#define PHY_LED1 0x50006000
#define PHY_LED2 0x50007000
#define PHY_LED3 0x50006000
#define PHY_RCC 0x50000A28
#define PHY_FAN 0x50006000
#define PHY_BELL 0x50003000
#endif
#include<linux/init.h>
#include<linux/module.h>
#include<linux/fs.h>
#include<linux/uaccess.h>
#include<linux/io.h>
#include<linux/device.h>
#include"ledall.h"
int major;
char kbuf[128]={0};
unsigned int *vir_moder;
struct class *cls;
struct device *dev;
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
gpio_t *vir_bell;
gpio_t *vir_fan;
unsigned int *vir_rcc;
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__);
unsigned long ret;
if(size>sizeof(kbuf))
{
size=sizeof(kbuf);
}
ret=copy_to_user(ubuf,kbuf,size);
if(ret)
{
printk("copy_to_user failed\n");
return ret;
}
return 0;
}
ssize_t mycdev_write(struct file *file,const char *ubuf,size_t size,loff_t *lof)
{
unsigned long ret;
if(size>sizeof(kbuf))
{
size=sizeof(kbuf);
}
ret=copy_from_user(kbuf,ubuf,size);
if(ret)
{
printk("copy_from_user failed\n");
return ret;
}
printk("结果是：%s\n",kbuf);
switch (kbuf[0]){
case '1':
if(kbuf[1]=='1')
vir_led1->odr |=(0x1<<10);
else if(kbuf[1]=='0')
vir_led1->odr &=(~(0x1<<10));
break;
case '2':
if(kbuf[1]=='1')
{
vir_led2->odr |=(0x1<<10);
}
else if(kbuf[1]=='0')
{
vir_led2->odr &=(~(0x1<<10));
}
break;
case '3':
if(kbuf[1]=='1')
vir_led3->odr |=(0x1<<8);
else if(kbuf[1]=='0')
vir_led3->odr &=(~(0x1<<8));
break;
case '4':
if(kbuf[1]=='1')
(vir_bell->odr) |= (0x1<<6);
else if(kbuf[1]=='0')
(vir_bell->odr) &= (~(0x1<<6));
break;
case '5':
if(kbuf[1]=='1')
(vir_fan->odr) |= (0x1<<9);
else if(kbuf[1]=='0')
(vir_fan->odr) &= (~(0x1<<9));
break;
}
return 0;
}
int mycdev_close(struct inode *inode,struct file *file)
{
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
return 0;
}
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);
//向上提交目录
cls=class_create(THIS_MODULE,"mychrdev");
if(IS_ERR(cls))
{
printk("向上提交目录失败\n");
return PTR_ERR(cls);
}
printk("向上提交目录成功！\n");
dev=device_create(cls,NULL,MKDEV(major,0),NULL,"mychrdev");
if(IS_ERR(dev))
{
printk("向上提交设备信息失败\n");
return PTR_ERR(dev);
}
printk("向上提交设备信息成功\n");
//灯的初始化
vir_led1=ioremap(PHY_LED1,sizeof(gpio_t));
vir_led2=ioremap(PHY_LED2,sizeof(gpio_t));
vir_led3=ioremap(PHY_LED3,sizeof(gpio_t));
vir_rcc=ioremap(PHY_RCC,4);
vir_bell=ioremap(PHY_BELL,sizeof(gpio_t));
vir_fan=ioremap(PHY_FAN,sizeof(gpio_t));
if(vir_led1==NULL)
{
printk("ioremap1 failed:%d\n",__LINE__);
return -ENOMEM;
}
if(vir_led2==NULL)
{
printk("ioremap2 failed:%d\n",__LINE__);
return -ENOMEM;
}
if(vir_led3==NULL)
{
printk("ioremap3 failed:%d\n",__LINE__);
return -ENOMEM;
}
if(vir_rcc==NULL)
{
printk("ioremaprcc failed:%d\n",__LINE__);
return -ENOMEM;
}
printk("物理地址映射成功\n");
//寄存器的初始化
//GPIOE,GPIOF引脚使能
*(vir_rcc) |= (0x1<<4);
*(vir_rcc) |= (0x1<<5);
//GPIOB引脚使能
*(vir_rcc) |= (0x1<<1);
(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));
//风扇和蜂鸣器
(vir_bell->moder) &= (~(0x3<<12));
(vir_bell->moder) |=(0x1<<12);
(vir_bell->odr) &= (~(0x1<<6));
(vir_fan->moder) &= (~(0x3<<18));
(vir_fan->moder) |=(0x1<<18);
(vir_fan->odr) &= (~(0x1<<9));
printk("初始化寄存器成功！\n");
return 0;
}
static void __exit mycdev_exit(void)
{
//取消地址映射
iounmap(vir_led1);
iounmap(vir_led2);
iounmap(vir_led3);
iounmap(vir_rcc);
//销毁设备信息
device_destroy(cls,MKDEV(major,0));
//销毁目录
class_destroy(cls);
//注销字符设备驱动
unregister_chrdev(major,"mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");
#include<stdlib.h>
#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("打开设备失败\n");
exit(-1);
}
while(1)
{
printf("请输入两个字符\n");
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1]='\0';
write(fd,buf,sizeof(buf));
}
close(fd);
return 0;
}