cs
复制代码
#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';
write(fd,buf,sizeof(buf));
}
close(fd);
return 0;
}
cs
复制代码
#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]={};
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;
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[0] == '1')
{
if(kbuf[1] == '0')
{
(*vir_led1_odr) &= (~(0x1<<10));
}
else if(kbuf[1]=='1')
{
(*vir_led1_odr) |= (0x1<<10);
}
}
else if(kbuf[0]=='2')
{
if(kbuf[1] == '0')
{
(*vir_led2_odr) &= (~(0x1<<10));
}
else if(kbuf[1]=='1')
{
(*vir_led2_odr) |= (0x1<<10);
}
}
else if(kbuf[0]=='3')
{
if(kbuf[1] == '0')
{
(*vir_led3_odr) &= (~(0x1<<8));
}
else if(kbuf[1]=='1')
{
(*vir_led3_odr) |= (0x1<<8);
}
}
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)
{
major = register_chrdev(0,"mychrdev",&fops);
if(major<0)
{
printk("字符设备驱动注册失败\n");
return major;
}
printk("注册字符设备驱动成功major=%d\n",major);
vir_led1_moder = ioremap(PHY_LED1_MODER,4);
if(vir_led1_moder == NULL)
{
printk("物理内存地址映射失败%d\n",__LINE__);
return -EFAULT;
}
vir_led1_odr = ioremap(PHY_LED1_ODR,4);
if(vir_led1_odr == NULL)
{
printk("物理内存地址映射失败%d\n",__LINE__);
return -EFAULT;
}
vir_led2_moder = ioremap(PHY_LED2_MODER,4);
if(vir_led2_moder == NULL)
{
printk("物理内存地址映射失败%d\n",__LINE__);
return -EFAULT;
}
vir_led2_odr = ioremap(PHY_LED2_ODR,4);
if(vir_led2_odr == NULL)
{
printk("物理内存地址映射失败%d\n",__LINE__);
return -EFAULT;
}
vir_led3_moder = ioremap(PHY_LED3_MODER,4);
if(vir_led3_moder == NULL)
{
printk("物理内存地址映射失败%d\n",__LINE__);
return -EFAULT;
}
vir_led3_odr = ioremap(PHY_LED3_ODR,4);
if(vir_led3_odr == 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");
(*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)
{
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);
unregister_chrdev(major,"mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");
