驱动开发-蜂鸣器、灯、风扇、马达-Toy模板网

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头文件

#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_GPIOB_ADDR 0x50003000
#define PHY_GPIOE_ADDR 0x50006000
#define PHY_GPIOF_ADDR 0x50007000

#define PHY_RCC_ADDR  0X50000A28

//功能码
#define ON _IOW('l',1,int)
#define OFF _IOW('l',0,int)


#endif

驱动程序

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

int major;
char kbuf[128] = {0};

gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
gpio_t *vir_buzzer;
gpio_t *vir_fan;
gpio_t *vir_driver;
unsigned int *vir_rcc;

struct class *cls;
struct device *dev;
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 ON:
        switch (arg)
        {
        case 1:                           // LED1
            vir_led1->ODR |= (0x1 << 10); // LED1开灯
            break;
        case 2:                           // LED2
            vir_led2->ODR |= (0x1 << 10); // LED2开灯
            break;
        case 3:                          // LED3
            vir_led3->ODR |= (0x1 << 8); // LED3开灯
            break;
        case 4:                          
            vir_buzzer->ODR |= (0x1 << 6); 
            break;
        case 5:                          
            vir_fan->ODR |= (0x1 << 9); 
            break;
        case 6:                          
            vir_driver->ODR |= (0x1 << 6); 
            break;
        }

        break;
    case OFF:
        switch (arg)
        {
        case 1:
            vir_led1->ODR &= (~(0X1 << 10));
            break;
        case 2:
            vir_led2->ODR &= (~(0X1 << 10));
            break;
        case 3:
            vir_led3->ODR &= (~(0X1 << 8));
            break;
        case 4:
            vir_buzzer->ODR &= (~(0X1 << 6));
            break;
        case 5:
            vir_fan->ODR &= (~(0X1 << 9));
            break;
        case 6:
            vir_driver->ODR &= (~(0X1 << 6));
            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_GPIOE_ADDR,sizeof(gpio_t));
    if(vir_led1 == NULL)
    {
        printk("ioremap filed：%d\n",__LINE__);
        return -ENOMEM;
    }

    vir_led2 = ioremap(PHY_GPIOF_ADDR,sizeof(gpio_t));
    if(vir_led2 == NULL)
    {
        printk("ioremap filed：%d\n",__LINE__);
        return -ENOMEM;
    }

    vir_led3=vir_led1;
    vir_fan=vir_led1;
    
    vir_driver=vir_led2;

    vir_buzzer = ioremap(PHY_GPIOB_ADDR,sizeof(gpio_t));
    if(vir_buzzer == 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);
    (*vir_rcc) |= (0x3 << 4);

    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)); 

    vir_buzzer->MODER &= (~(0x3 << 12));
    vir_buzzer->MODER |= (0x1 << 12);
    vir_buzzer->ODR &= (~(0x1 << 6)); 

    vir_fan->MODER &= (~(0x3 << 18));
    vir_fan->MODER |= (0x1 << 18);
    vir_fan->ODR &= (~(0x1 << 9)); 

    vir_driver->MODER &= (~(0x3 << 12));
    vir_driver->MODER |= (0x1 << 12);
    vir_driver->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, "buzzer", &fops);
    //major = register_chrdev(0, "buzzer", &fops);
    //major = register_chrdev(0, "buzzer", &fops);
    //major = register_chrdev(0, "buzzer", &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, "my");
    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");

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

    printk("向上提交设备节点信息成功\n");
    // 寄存器映射以及初始化
    all_led_init();

    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_buzzer);
    iounmap(vir_fan);
    iounmap(vir_driver);
    iounmap(vir_rcc);
    
    // 销毁节点信息
    device_destroy(cls, MKDEV(major, 0));

    // 销毁目录信息
    class_destroy(cls);

    // 注销字符设备驱动
    unregister_chrdev(major, "buzzer");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

应用程序文章来源地址https://www.toymoban.com/news/detail-605026.html

#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;
    int fd=open("/dev/my",O_RDWR);
    if(fd<0)
    {
        printf("打开设备文件失败\n");
        exit(-1);
    }
    while(1)
    {
        //从终端读取
        printf("请输入要控制的硬件 1(LED1) 2(LED2) 3(LED3) 4(buzzer) 5(fan) 6(driver)>");
        scanf("%d",&b);
        printf("请输入指令0(关) 1(开)\n");
        scanf("%d",&a);
        switch(a)
        {
            case 1:
                ioctl(fd,ON,b);
                break;
            case 0:
                ioctl(fd,OFF,b);
                break;
        }
        
    }

    close(fd);

    return 0;
}

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