驱动开发day2

demo3.c

#include
#include
#include
#include
#include "head.h"
#include
unsigned int major;
char kbuf[128]={};
//定义三个指针指向映射后的虚拟内存
unsigned int *vir_moder1;
unsigned int *vir_odr1;
unsigned int *vir_moder2;
unsigned int *vir_odr2;
unsigned int *vir_moder3;
unsigned int *vir_odr3;
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)
{
    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'&&kbuf[1]=='0')         //关灯
    {
        (*vir_odr1) &= (~(0x1 << 10));
    }
    else if(kbuf[0]=='1'&&kbuf[1]=='1')   //开灯
    {
        (*vir_odr1) |= (0x1 << 10);
    }
    if(kbuf[0]=='2'&&kbuf[1]=='0')         //关灯
    {
        (*vir_odr2) &= (~(0x1 << 10));
    }
    else if(kbuf[0]=='2'&&kbuf[1]=='1')   //开灯
    {
        (*vir_odr2) |= (0x1 << 10);
    }
    if(kbuf[0]=='3'&&kbuf[1]=='0')         //关灯
    {
        (*vir_odr3) &= (~(0x1 << 8));
    }
    else if(kbuf[0]=='3'&&kbuf[1]=='1')   //开灯
    {
        (*vir_odr3) |= (0x1 << 8);
    }
    return 0;
}
int mycdev_close(struct inode *inode,struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    return 0;
}
//定义操作方法结构体对象
struct file_operations fops={
    .open=mycdev_open,
    .read=mycdev_read,
    .write=mycdev_write,
    .release=mycdev_close,
};
static int __init s1(void)
{
    //注册字符设备驱动
    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);

    //进行寄存器的地址映射，将物理地址映射为虚拟地址
    vir_moder1=ioremap(PHY_LED1_MODER,4);
    vir_moder2=ioremap(PHY_LED2_MODER,4);
    vir_moder3=ioremap(PHY_LED3_MODER,4);
    if(vir_moder1==NULL||vir_moder2==NULL||vir_moder3==NULL)
    {
        printk("物理内存地址映射失败%d\n",__LINE__);
        return -EFAULT;
    }
    vir_odr1=ioremap(PHY_LED1_ODR,4);
    vir_odr2=ioremap(PHY_LED2_ODR,4);
    vir_odr3=ioremap(PHY_LED3_ODR,4);
    if(vir_odr1==NULL||vir_odr2==NULL||vir_odr3==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("物理内存地址映射成功\n");

    (*vir_rcc) |= (0x1<<4);//GPIOE控制器时钟使能
    (*vir_rcc) |= (0x1<<5);
    //LED1寄存器初始化
    (*vir_moder1) &= (~(0x3<<20));
    (*vir_moder1) |= (0x1<<20);
    (*vir_odr1) &= (~(0x1<<10));//默认关灯
    //LED2寄存器初始化
    (*vir_moder2) &= (~(0x3<<20));
    (*vir_moder2) |= (0x1<<20);
    (*vir_odr2) &= (~(0x1<<10));//默认关灯
    //LED3寄存器初始化
    (*vir_moder3) &= (~(0x3<<16));
    (*vir_moder3) |= (0x1<<16);
    (*vir_odr3) &= (~(0x1<<8));//默认关灯
    return 0;
}
static void __exit s2(void)
{
    //取消物理地址内存映射
    iounmap(vir_rcc);
    iounmap(vir_moder1);
    iounmap(vir_odr1);
    iounmap(vir_moder2);
    iounmap(vir_odr2);
    iounmap(vir_moder3);
    iounmap(vir_odr3);
    //注销字符设备驱动
    unregister_chrdev(major,"mychrdev");
}
module_init(s1);
module_exit(s2);
MODULE_LICENSE("GPL");

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

#include

#include

#include

#include

#include

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);//从终端读取一个字符串

        buf[strlen(buf)-1]='\0';

        write(fd,buf,sizeof(buf));

        memset(buf,0,sizeof(buf));

    }

    close(fd);

    return 0;

}