通过ioctl函数选择不同硬件的控制，LED 蜂鸣器马达风扇

实验现象

在这里插入图片描述

head.h

#ifndef __HEAD_H__
#define __HEAD_H__ 
typedef struct{
    volatile unsigned int MODER;   // 0x00
	volatile unsigned int OTYPER;  // 0x04
	volatile unsigned int OSPEEDR; // 0x08
	volatile unsigned int PUPDR;   // 0x0C
	volatile unsigned int IDR;     // 0x10
	volatile unsigned int ODR;     // 0x14
	volatile unsigned int BSRR;    // 0x18
	volatile unsigned int LCKR;    // 0x1C 
	volatile unsigned int AFRL;    // 0x20 
	volatile unsigned int AFRH;    // 0x24
	volatile unsigned int BRR;     // 0x28
	volatile unsigned int res;
	volatile unsigned int SECCFGR; // 0x30
}gpio_t;
#define PHY_LED1_ADDR 0X50006000
#define PHY_LED2_ADDR    0X50007000
#define PHY_LED3_ADDR 0X50006000
#define PHY_RCC_ADDR    0X50000A28
#define GPIOB 0X50003000
#define GPIOE 0X50006000
#define GPIOF 0X50007000
 
 
#define LED_ON _IOW('l',1,int)  //开灯
#define LED_OFF _IOW('l',0,int)//关灯
#define FAN_ON _IO('f',1)  //开风扇
#define FAN_OFF _IO('f',0)  //关风扇
#define MOTOR_ON _IO('m',1)  //开马达
#define MOTOR_OFF _IO('m',0)  //关马达
#define BEE_ON _IO('b',1)  //开蜂鸣器
#define BEE_OFF _IO('b',0)  //管蜂鸣器

#endif

test.c

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include "head.h"

int main(int argc, char const *argv[])
{
    int a, b;
    char buf[128] = {0};
    char ch[128] = {0}; // 判断控制哪个硬件
    printf("请输入要控制的硬件：LED(LED) fan(风扇) motor(马达) bee(蜂鸣器)>>>");
    scanf("%s",ch);
    getchar(); // 接收垃圾字符
    if (!strcmp(ch,"LED"))
    {
        int fd = open("/dev/led0", O_RDWR);
        if (fd < 0)
        {
            printf("打开led设备文件失败\n");
            exit(-1);
        }
        while (1)
        {
            // 从终端读取
            printf("请选择要实现的功能\n");
            printf("0(关灯) 1(开灯)>>>");
            scanf("%d", &a);
            printf("请输入要控制的灯\n");
            printf("1(LED1) 2(LED2) 3(LED3)>>>");
            scanf("%d", &b);
            if (a == 1) // 开灯
            {
                ioctl(fd, LED_ON, &b);
            }
            else if (a == 0) // 关灯
            {
                ioctl(fd, LED_OFF, &b);
            }
        }
        close(fd);
    }
    else if(!strcmp(ch,"fan"))
    {
        int fd_fan = open("/dev/fan",O_RDWR);
        if(fd_fan < 0)
        {
            printf("打开fan设备文件失败\n");
            exit(-1);
        }
        while(1)
        {
            //从终端读取
            printf("请输入要实现的功能\n");
            printf("0(关闭风扇) 1(开启风扇)>>>");
            scanf("%d",&a);
            if(a == 1)
            {
                ioctl(fd_fan,FAN_ON);
            }
            else if(a == 0)
            {
                ioctl(fd_fan,FAN_OFF);
            }
            
        }
        close(fd_fan);
    }
    else if(!strcmp(ch,"motor"))
    {
        int fd_motor = open("/dev/motor",O_RDWR);
        if(fd_motor < 0)
        {
            printf("打开motor设备文件失败\n");
            exit(-1);
        }
        while(1)
        {
            //从终端读取
            printf("请输入要实现的功能\n");
            printf("0(关闭马达) 1(开启马达)>>>");
            scanf("%d",&a);
            if(a == 1)
            {
                ioctl(fd_motor,MOTOR_ON);
            }
            else if(a == 0)
            {
                ioctl(fd_motor,MOTOR_OFF);
            }
            
        }
        close(fd_motor);
    }
    else if(!strcmp(ch,"bee"))
    {
        int fd_bee = open("/dev/bee",O_RDWR);
        if(fd_bee < 0)
        {
            printf("打开bee设备文件失败\n");
            exit(-1);
        }
        while(1)
        {
            //从终端读取
            printf("请输入要实现的功能\n");
            printf("0(关闭蜂鸣器) 1(开启蜂鸣器)>>>");
            scanf("%d",&a);
            if(a == 1)
            {
                ioctl(fd_bee,BEE_ON);
            }
            else if(a == 0)
            {
                ioctl(fd_bee,BEE_OFF);
            }
            
        }
        close(fd_bee);
    }
    else
        printf("输入有误！\n");
    

    return 0;
}

led.c

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/device.h>
#include "head.h"
 
struct class *cls;
struct device *dev;
int major;
char kbuf[128] = {0};
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
unsigned int *vir_rcc;
int mycdev_open(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
    int which;
    //通过拷贝函数获取ioctl第三个参数对应空间的数值
    int ret=copy_from_user(&which,(void *)arg,4);
    if(ret)
    {
        printk("拷贝用户空间数据失败\n");
        return -EIO;
    }
    //进行功能控制
    switch (cmd)
    {
    case LED_ON: // 开灯
        switch (which)
        {
        case 1: // LED1
            vir_led1->ODR |= (0x1 << 10);
            break;
        case 2: // LED2
            vir_led2->ODR |= (0x1 << 10);
            break;
        case 3: // LED3
            vir_led3->ODR |= (0x1 << 8);
            break;
        }
        break;
    case LED_OFF: // 关灯
        switch (which)
        {
        case 1:
            vir_led1->ODR &= (~(0X1 << 10));
            break;
        case 2:
            vir_led2->ODR &= (~(0X1 << 10));
            break;
        case 3:
            vir_led3->ODR &= (~(0X1 << 8));
            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赋值
struct file_operations fops = {
 
    .open = mycdev_open,
    .unlocked_ioctl = mycdev_ioctl,
    .release = mycdev_close,
};
 
int all_led_init(void)
{
    // 寄存器地址的映射
    vir_led1 = ioremap(PHY_LED1_ADDR, sizeof(gpio_t));
    if (vir_led1 == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    vir_led2 = ioremap(PHY_LED2_ADDR, sizeof(gpio_t));
    if (vir_led2 == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    vir_led3 = vir_led1;
    vir_rcc = ioremap(PHY_RCC_ADDR, 4);
    if (vir_rcc == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    printk("物理地址映射成功\n");
    // 寄存器的初始化
    // rcc
    (*vir_rcc) |= (3 << 4);
    // led1
    vir_led1->MODER &= (~(3 << 20));
    vir_led1->MODER |= (1 << 20);
    vir_led1->ODR &= (~(1 << 10));
    // led2
    vir_led2->MODER &= (~(3 << 20));
    vir_led2->MODER |= (1 << 20);
    vir_led2->ODR &= (~(1 << 10));
    // led3
    vir_led3->MODER &= (~(3 << 16));
    vir_led1->MODER |= (1 << 16);
    vir_led1->ODR &= (~(1 << 8));
    printk("寄存器初始化成功\n");
 
    return 0;
}
 
static int __init mycdev_init(void)
{
    int i;
    // 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);
    }
    // 向上提交设备节点信息
    // 为三盏灯创建三个设备文件
    for (i = 0; i < 3; i++)
    {
        dev = device_create(cls, NULL, MKDEV(major, i), NULL, "led%d", i);
        if (IS_ERR(dev))
        {
            printk("向上提交设备节点信息失败\n");
            return -PTR_ERR(dev);
        }
    }
    // 寄存器映射以及初始化
    all_led_init();
 
    return 0;
}
static void __exit mycdev_exit(void)
{
    int i;
    // 取消地址映射
    iounmap(vir_led1);
    iounmap(vir_led2);
    iounmap(vir_rcc);
    // 销毁设备节点信息
    for (i = 0; i < 3; i++)
    {
        device_destroy(cls, MKDEV(major, i));
    }
    // 销毁目录信息
    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");

fan.c

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/device.h>
#include "head.h"

struct class *cls;
struct device *dev;
gpio_t *vir_gpioe;
int major;
char kbuf[128] = {0};
unsigned int *vir_rcc;
int mycdev_open(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
    switch (cmd)
    {
    case FAN_ON: // 开风扇
        vir_gpioe->ODR |= (0x1 << 9);
        break;
    case FAN_OFF: // 关风扇
        vir_gpioe->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;
}
// 定义操作方法结构体变量并赋值
struct file_operations fops = {

    .open = mycdev_open,
    .unlocked_ioctl = mycdev_ioctl,
    .release = mycdev_close,
};
int all_fan_init(void)
{
    // 寄存器地址的映射
    vir_gpioe = ioremap(GPIOE, sizeof(gpio_t));
    if (vir_gpioe == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    vir_rcc = ioremap(PHY_RCC_ADDR,4);
    if (vir_rcc == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    printk("物理地址映射成功\n");
    // 寄存器的初始化
    // rcc
    (*vir_rcc) |= (0x3 << 4);
    // fan
    vir_gpioe->MODER &= (~(0x3 << 18));
    vir_gpioe->MODER |= (0x1 << 18);
    vir_gpioe->ODR &= (~(0x1 << 9));

    printk("寄存器初始化成功\n");

    return 0;
}
static int __init mycdev_init(void)
{

    // 字符设备驱动注册
    major = register_chrdev(0, "fan", &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, "fan");
    if (IS_ERR(cls))
    {
        printk("向上提交目录失败\n");
        return -PTR_ERR(cls);
    }
    // 向上提交设备节点信息
    // 创建设备文件

    dev = device_create(cls, NULL, MKDEV(major,0), NULL, "fan");
    if (IS_ERR(dev))
    {
        printk("向上提交设备节点信息失败\n");
        return -PTR_ERR(dev);
    }

    // 寄存器映射以及初始化
    all_fan_init();
    return 0;
}
static void __exit mycdev_exit(void)
{
    iounmap(vir_gpioe);
    iounmap(vir_rcc);
    device_destroy(cls,MKDEV(major,0));
    class_destroy(cls);
    unregister_chrdev(major,"fan");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

motor.c

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/device.h>
#include "head.h"

struct class *cls;
struct device *dev;
gpio_t *vir_gpiof;
int major;
char kbuf[128] = {0};
unsigned int *vir_rcc;
int mycdev_open(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
    switch (cmd)
    {
    case MOTOR_ON: // 开马达
        vir_gpiof->ODR |= (0x1 << 6);
        break;
    case MOTOR_OFF: // 关马达
        vir_gpiof->ODR &= (~(0X1 << 6));
        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赋值
struct file_operations fops = {

    .open = mycdev_open,
    .unlocked_ioctl = mycdev_ioctl,
    .release = mycdev_close,
};
int all_motor_init(void)
{
    // 寄存器地址的映射
    vir_gpiof = ioremap(GPIOB, sizeof(gpio_t));
    if (vir_gpiof == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    vir_rcc = ioremap(PHY_RCC_ADDR,4);
    if (vir_rcc == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    printk("物理地址映射成功\n");
    // 寄存器的初始化
    // rcc
    (*vir_rcc) |= (0x3 << 4);
    // fan
    vir_gpiof->MODER &= (~(0x3 << 12));
    vir_gpiof->MODER |= (0x1 << 12);
    vir_gpiof->ODR &= (~(0x1 << 6));

    printk("寄存器初始化成功\n");

    return 0;
}
static int __init mycdev_init(void)
{

    // 字符设备驱动注册
    major = register_chrdev(0, "bee", &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, "bee");
    if (IS_ERR(cls))
    {
        printk("向上提交目录失败\n");
        return -PTR_ERR(cls);
    }
    // 向上提交设备节点信息
    // 创建设备文件

    dev = device_create(cls, NULL, MKDEV(major,0), NULL, "bee");
    if (IS_ERR(dev))
    {
        printk("向上提交设备节点信息失败\n");
        return -PTR_ERR(dev);
    }

    // 寄存器映射以及初始化
    all_motor_init();
    return 0;
}
static void __exit mycdev_exit(void)
{
    iounmap(vir_gpiof);
    iounmap(vir_rcc);
    device_destroy(cls,MKDEV(major,0));
    class_destroy(cls);
    unregister_chrdev(major,"bee");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

bee.c

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/device.h>
#include "head.h"

struct class *cls;
struct device *dev;
gpio_t *vir_gpiob;
int major;
char kbuf[128] = {0};
unsigned int *vir_rcc;
int mycdev_open(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
    switch (cmd)
    {
    case BEE_ON: // 开马达
        vir_gpiob->ODR |= (0x1 << 6);
        break;
    case BEE_OFF: // 关马达
        vir_gpiob->ODR &= (~(0X1 << 6));
        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赋值
struct file_operations fops = {

    .open = mycdev_open,
    .unlocked_ioctl = mycdev_ioctl,
    .release = mycdev_close,
};
int all_motor_init(void)
{
    // 寄存器地址的映射
    vir_gpiob = ioremap(GPIOB, sizeof(gpio_t));
    if (vir_gpiob == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    vir_rcc = ioremap(PHY_RCC_ADDR,4);
    if (vir_rcc == NULL)
    {
        printk("ioremap filed：%d\n", __LINE__);
        return -ENOMEM;
    }
    printk("物理地址映射成功\n");
    // 寄存器的初始化
    // rcc
    (*vir_rcc) |= (0x1 << 1);
    // fan
    vir_gpiob->MODER &= (~(0x3 << 12));
    vir_gpiob->MODER |= (0x1 << 12);
    vir_gpiob->ODR &= (~(0x1 << 6));

    printk("寄存器初始化成功\n");

    return 0;
}
static int __init mycdev_init(void)
{

    // 字符设备驱动注册
    major = register_chrdev(0, "bee", &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, "bee");
    if (IS_ERR(cls))
    {
        printk("向上提交目录失败\n");
        return -PTR_ERR(cls);
    }
    // 向上提交设备节点信息
    // 创建设备文件

    dev = device_create(cls, NULL, MKDEV(major,0), NULL, "bee");
    if (IS_ERR(dev))
    {
        printk("向上提交设备节点信息失败\n");
        return -PTR_ERR(dev);
    }

    // 寄存器映射以及初始化
    all_motor_init();
    return 0;
}
static void __exit mycdev_exit(void)
{
    iounmap(vir_gpiob);
    iounmap(vir_rcc);
    device_destroy(cls,MKDEV(major,0));
    class_destroy(cls);
    unregister_chrdev(major,"bee");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");