驱动作业6灯点亮和马达风扇蜂鸣器

于 2023-02-08 21:16:10 发布
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文章标签： 嵌入式硬件
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
本文链接：https://blog.youkuaiyun.com/shen20010928/article/details/128943615
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modules.c

#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"head.h"

int major;
struct class *cls;
struct device *dev;
//定义一些变量接收映射后的虚拟地址
unsigned int *vir_rcc;
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
unsigned int *vir_rcc_z;


gpio_t *vir_led1_z;
gpio_t *vir_led2_z;
gpio_t *vir_led3_z;
gpio_t *vir_tm4;
gpio_t *vir_tm16;
gpio_t *vir_tm1;


char kbuf[128]={0};
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 *off)
{
    int ret; 
    //判断kbuf的大小，如果<size,把size的数值修改为kbuf的大小
    if(size>sizeof(kbuf))
    size=sizeof(kbuf);
    ret=copy_to_user(ubuf,kbuf,size);
    if(ret)
    {
        printk("copy_to_user filed\n");
        return -EIO;//拷贝失败返回错误码
    }
    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 *off)
{
    int ret;
    if(size>sizeof(kbuf))
    size=sizeof(kbuf);
    ret=copy_from_user(kbuf,ubuf,size);
    if(ret)
    {
        printk("copy_from_user filed\n");
        return -EIO;//拷贝失败返回错误码
    }

    return 0;
}
//ioctl
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
  {
    int which,ret;
    switch(cmd)
    {
        case LED_ON:
           ret=copy_from_user(&which,(void *)arg,sizeof(int));//把ioctl第三个参数的数值获取到
           if(ret)
           {
            printk("copy_from_user err\n");
            return -ENOMEM;
           }
           switch(which)
           {
            case 1:
               vir_led1->ODR |= (1<<10);
			   break;
            case 2:
               vir_led2->ODR |= (1<<10);
                break;
            case 3:
               vir_led3->ODR |= (1<<8);
                break;
            case 4:
               vir_led1_z->ODR |= (1<<5);
                break;
            case 5:
              vir_led2_z->ODR |= (1<<6);
                break;
            case 6:
              vir_led3_z->ODR |= (1<<7);
                break;
            case 7:
               vir_tm4->ODR |= (1<<6);
                break;
            case 8:
              vir_tm16->ODR |= (1<<6);
                break;
            case 9:
              vir_tm1->ODR |= (1<<9);
                break;
           }
    
            break;
        case LED_OFF:
              ret=copy_from_user(&which,(void *)arg,sizeof(int));//把ioctl第三个参数的数值获取到
           if(ret)
           {
            printk("copy_from_user err\n");
            return -ENOMEM;
           }
           switch(which)
           {
           case 1:
               vir_led1->ODR &= (~(1<<10));
			   break;
            case 2:
               vir_led2->ODR &= (~(1<<10));
                break;
            case 3:
               vir_led3->ODR &= (~(1<<8));
                break;
            case 4:
               vir_led1_z->ODR &= (~(1<<5));
                break;
            case 5:
              vir_led2_z->ODR &= (~(1<<6));
                break;
            case 6:
              vir_led3_z->ODR &= (~(1<<7));
                break;
            case 7:
               vir_tm4->ODR &= (~(1<<6));
                break;
            case 8:
              vir_tm16->ODR &= (~(1<<6));
                break;
            case 9:
              vir_tm1->ODR &= (~(1<<9));
                break;

           }
            break;
    }
    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初始化
struct file_operations fops=
{
    .open=mycdev_open,
    .read=mycdev_read,
    .write=mycdev_write,
    .unlocked_ioctl=mycdev_ioctl,
    .release=mycdev_close,
};
void all_led_init(void)
{
    //进行物理地址的映射
    vir_led1=ioremap(PHY_LED1_ADDR,sizeof(gpio_t));
    if(vir_led1==NULL)
    {
        printk("LED1寄存器映射失败\n");
      
    }
    vir_led2=ioremap(PHY_LED2_ADDR,sizeof(gpio_t));
    if(vir_led2==NULL)
    {
        printk("LED2寄存器映射失败\n");
    
    }
    vir_led3=ioremap(PHY_LED3_ADDR,sizeof(gpio_t));
    if(vir_led3==NULL)
    {
        printk("LED3寄存器映射失败\n");
      
    }
    vir_rcc=ioremap(PHY_RCC_ADDR,4);
    if(vir_rcc==NULL)
    {
        printk("RCC寄存器映射失败\n");
       
    }
     vir_led1_z=ioremap(PHY_LED1,sizeof(gpio_t));
    if(vir_led1_z==NULL)
    {
        printk("LED1映射失败\n");
         }


   vir_led2_z=ioremap(PHY_LED2,sizeof(gpio_t));
   if(vir_led2_z==NULL)
    {
        printk("LED2映射失败\n");
          }
    vir_led3_z=ioremap(PHY_LED3,sizeof(gpio_t));
    if(vir_led3_z==NULL)
    {
        printk("LED3映射失败\n");
           }
    vir_rcc_z=ioremap(PHY_ZB_RCC,4);
    if(vir_rcc_z==NULL)
    {
        printk("zb_RCC寄存器映射失败\n");
    }
      vir_tm4=ioremap(PHY_TM4_MODER,sizeof(gpio_t));
    if(vir_tm4==NULL)
    {
        printk("tim4映射失败\n");
	}
    vir_tm16=ioremap(PHY_TM16_MODER,sizeof(gpio_t));
    if(vir_tm16==NULL)
    {
        printk("tim16映射失败\n");
    }
    vir_tm1=ioremap(PHY_TM1_MODER,sizeof(gpio_t));
    if(vir_tm1==NULL)
    {
        printk("tim1映射失败\n");
   
    }

    printk("寄存器物理地址映射成功\n");
    //寄存器的初始化
    vir_led1->MODER &= (~(3<<20));//设置为输出模式
    vir_led1->MODER |= (1<<20);
    vir_led1->ODR &= (~(1<<10));//输出低电平

    vir_led2->MODER &= (~(3<<20));//设置为输出模式
    vir_led2->MODER |= (1<<20);
    vir_led2->ODR &= (~(1<<10));//输出低电平

    vir_led3->MODER &= (~(3<<16));//设置为输出模式
    vir_led3->MODER |= (1<<16);
    vir_led3->ODR &= (~(1<<8));//输出低电平

	vir_led1_z->MODER &= (~(3<<10));
    vir_led1_z->MODER |= (1<<10);
    vir_led1_z->ODR &= (~(1<<5));

    vir_led2_z->MODER &= (~(3<<12));
    vir_led2_z->MODER |= (1<<12);
    vir_led2_z->ODR &= (~(1<<6));

    vir_led3_z->MODER &= (~(3<<14));
    vir_led3_z->MODER |= (1<<14);
    vir_led3_z->ODR &= (~(1<<7));
    
    vir_tm4->MODER &= (~(3<<12));
    vir_tm4->MODER |= (1<<12);
    vir_tm4->ODR &= (~(1<<6));
 
    vir_tm16->MODER &= (~(3<<12));
    vir_tm16->MODER |= (1<<12);
    vir_tm16->ODR &= (~(1<<6));
 
    vir_tm1->MODER &= (~(3<<18));
    vir_tm1->MODER |= (1<<18);
    vir_tm1->ODR &= (~(1<<9));

	(*vir_rcc_z) |= (1<<0);
	(*vir_rcc) |= (1<<1);
    (*vir_rcc) |= (3<<4);//rcc使能
    printk("寄存器初始化成功\n");

}
//入口函数
static int __init mycdev_init(void)
{
      int i;
    //进行字符设备驱动的注册
    major=register_chrdev(0,"mycdev",&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,"mycdev");
    if(IS_ERR(cls))//指针指向预留空间，函数调用失败
    {
        printk("向上提交目录失败\n");
        return PTR_ERR(cls);
    }
     printk("向上提交目录成功\n");
     //向上提交设备节点
    
     for(i=0;i<3;i++)
     {
        dev=device_create(cls,NULL,MKDEV(major,i),NULL,"mycdev%d",i);
         if(IS_ERR(dev))//指针指向预留空间，函数调用失败
        {
             printk("向上提交目录失败\n");
            return PTR_ERR(dev);
        }
     }

     printk("设备节点向上提交成功\n");
    //led寄存器初始化
    all_led_init();

    return 0;
}
//出口函数
static void __exit mycdev_exit(void)
{
      int i;
    //取消物理内存的映射
    iounmap(vir_led1);
    iounmap(vir_led2);
    iounmap(vir_led3);
    iounmap(vir_rcc);
    //删除节点信息
  
    for(i=0;i<3;i++)
    {
        device_destroy(cls,MKDEV(major,i));
    }
    //删除目录信息
    class_destroy(cls);
    //字符设备驱动的注销
    unregister_chrdev(major,"mycdev");

}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

head.h

#ifndef __HEAD_H__
#define __HEAD_H__

//封装寄存器结体
typedef struct{
    volatile unsigned int MODER;
    volatile unsigned int OTYPER;
    volatile unsigned int  OSPEEDR;
    volatile unsigned int  PUPDR;
    volatile unsigned int  IDR;
    volatile unsigned int  ODR;
    volatile unsigned int   BSRR;
}gpio_t;

#define PHY_RCC_ADDR  0X50000A28
#define PHY_LED1_ADDR 0X50006000
#define PHY_LED2_ADDR 0X50007000
#define PHY_LED3_ADDR 0X50006000



#define PHY_TM4_MODER 0X50003000
#define PHY_TM16_MODER 0X50007000
#define PHY_TM1_MODER 0X50006000

#define PHY_ZB_RCC 0X54000210
#define PHY_LED1 0X54004000
#define PHY_LED2 0X54004000
#define PHY_LED3 0X54004000


//封装LED开关的功能码
#define LED_ON _IOW('l',1,int)//开灯
#define LED_OFF _IOW('l',0,int)//关灯

#endif

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