驱动DAY3 控制三盏灯亮灭

news2024/11/19 23:41:46

1.头文件

#ifndef __HEAD_H__
#define __HEAD_H__
//LED1 PE10 和 LED3 PE8
#define PHY_LED1_MODER 0X50006000
#define PHY_LED1_ODR 0X50006014
#define PHY_LED1_RCC 0X50000A28
//LED2 PF10
#define PHY_LED2_MODER 0X50007000
#define PHY_LED2_ODR 0X50007014



#endif

2.驱动代码

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

void delay_ms(int ms)
{
    int i, j;
    for (i = 0; i < ms; i++)
        for (j = 0; j < 1800; j++)
            ;
}

unsigned int major; // 定义一个变量保存主设备号
char kbuf[128] = {0};

// 定义指针接收映射成功的虚拟内存首地址
unsigned int *vir_moder;
unsigned int *vir_odr;
unsigned int *vir_rcc;

unsigned int *vir2_moder;
unsigned int *vir2_odr;

struct class *cls;
struct device *dev;
// 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 filad\n");
        return ret;
    }

    return 0;
}
ssize_t mycdev_write(struct file *file, const char *ubuf, size_t size, loff_t *lof)
{
    int ret;
    ret = copy_from_user(kbuf, ubuf, size);
    if (ret)
    {
        printk("copy_from_user filed\n");
        return ret;
    }
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    /*
    if (kbuf[0] == '1') // 开灯
    {
        // 开灯逻辑
        (*vir_odr) |= (0X1 << 10);
    }
    else if (kbuf[0] == '0') // 关灯
    {
        // 关灯逻辑
        (*vir_odr) &= (~(0X1 << 10));
    }
    */
    switch (kbuf[0])
    {
    case '1': // LED1灯
        switch (kbuf[1])
        {
        case '0': // LED1灯灭
            (*vir_odr) &= (~(0X1 << 10));
            break;
        case '1': // LED1灯亮
            (*vir_odr) |= (0X1 << 10);
            break;
        }
        break;
    case '2': // LED2灯
        switch (kbuf[1])
        {
        case '0': // LED2灯灭
            (*vir2_odr) &= (~(0X1 << 10));
            break;
        case '1': // LED2灯亮
            (*vir2_odr) |= (0X1 << 10);
            break;
        }
        break;
    case '3': // LED3灯
        switch (kbuf[1])
        {
        case '0': // LED3灯灭
            (*vir_odr) &= (~(0X1 << 8));
            break;
        case '1': // LED3灯亮
            (*vir_odr) |= (0X1 << 8);
            break;
        }
        break;
    case '4': // 流水灯
        switch (kbuf[1])
        {
        case '0': // 顺序流水灯 1 2 3 循环10次
        {
            printk("顺序流水灯\n");
            int k = 0;
            for (k = 0; k < 10; k++)
            {
                (*vir_odr) |= (0X1 << 10);
                delay_ms(500);
                (*vir_odr) &= (~(0X1 << 10));
                delay_ms(500);
                (*vir2_odr) |= (0X1 << 10);
                delay_ms(500);
                (*vir2_odr) &= (~(0X1 << 10));
                delay_ms(500);
                (*vir_odr) |= (0X1 << 8);
                delay_ms(500);
                (*vir_odr) &= (~(0X1 << 8));
                delay_ms(500);
            }
        }
        break;
        case '1': // 逆向流水灯 3 2 1 循环10次
        {
            printk("顺序流水灯\n");
            int m = 0;
            for (m = 0; m < 10; m++)
            {
                (*vir_odr) |= (0X1 << 8);
                delay_ms(500);
                (*vir_odr) &= (~(0X1 << 8));
                delay_ms(500);
                (*vir2_odr) |= (0X1 << 10);
                delay_ms(500);
                (*vir2_odr) &= (~(0X1 << 10));
                delay_ms(500);
                (*vir_odr) |= (0X1 << 10);
                delay_ms(500);
                (*vir_odr) &= (~(0X1 << 10));
                delay_ms(500);
            }
            break;
        }
        }
        break;
    default:
        printk("输入错误，请重新输入\n");
        break;
    }
    return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
    return 0;
}

// 定义一个操作方法结构体变量并且初始化
struct file_operations fops = {
    .open = mycdev_open,
    .release = mycdev_close,
    .read = mycdev_read,
    .write = mycdev_write,
};
static int __init mycdev_init(void)
{
    int i = 0;
    // 注册字符设备驱动
    major = register_chrdev(0, "mychrdev", &fops);
    if (major < 0)
    {
        printk("注册字符设备驱动失败\n");
        return major;
    }
    printk("注册字符设备驱动成功 主设备号major=%d\n", major);

    // 向上提交目录信息
    cls = class_create(THIS_MODULE, "mycdev");
    if (IS_ERR(cls))
    {
        printk("向上提交目录信息失败\n");
        return -PTR_ERR(cls);
    }
    printk("向上提交目录信息成功\n");
    // 向上提交设备信息
    for (i = 0; i < 3; i++)
    {
        dev = device_create(cls, NULL, MKDEV(major, i), NULL, "mycdev%d", i);
        if (IS_ERR(dev))
        {
            printk("向上提交设备节点失败\n");
            return -PTR_ERR(cls);
        }
    }
    printk("向上提交设备节点信息成功\n");

    // 完成硬件寄存器物理内存的映射
    // LED1 和 LED3  物理内存映射
    vir_moder = ioremap(PHY_LED1_MODER, 4);
    if (vir_moder == NULL)
    {
        printk("物理内存映射失败%d\n", __LINE__);
        return -EFAULT;
    }
    vir_odr = ioremap(PHY_LED1_ODR, 4);
    if (vir_odr == NULL)
    {
        printk("物理内存映射失败%d\n", __LINE__);
        return -EFAULT;
    }
    vir_rcc = ioremap(PHY_LED1_RCC, 4);
    if (vir_rcc == NULL)
    {
        printk("物理内存映射失败%d\n", __LINE__);
        return -EFAULT;
    }
    printk("LED1 LED3 物理内存映射成功\n");

    // LED2 物理内存映射
    vir2_moder = ioremap(PHY_LED2_MODER, 4);
    if (vir2_moder == NULL)
    {
        printk("物理内存映射失败%d\n", __LINE__);
        return -EFAULT;
    }
    vir2_odr = ioremap(PHY_LED2_ODR, 4);
    if (vir2_odr == NULL)
    {
        printk("物理内存映射失败%d\n", __LINE__);
        return -EFAULT;
    }
    printk("LED2 物理内存映射成功\n");

    // rcc使能 GPIOE组 GPIOF组
    (*vir_rcc) |= (0X1 << 4);
    (*vir_rcc) |= (0X1 << 5);

    // LED1灯初始化 PE10
    //  硬件寄存器的初始化
    (*vir_moder) &= (~(0X3 << 20)); // 设置为输出
    (*vir_moder) |= (0X1 << 20);
    // 默认关灯
    (*vir_odr) &= (~(0X1 << 10));

    // LED2灯初始化 PF10
    //  硬件寄存器的初始化
    (*vir2_moder) &= (~(0X3 << 20)); // 设置为输出
    (*vir2_moder) |= (0X1 << 20);
    // 默认关灯
    (*vir2_odr) &= (~(0X1 << 10));

    // LED3灯初始化 PE8
    //  硬件寄存器的初始化
    (*vir_moder) &= (~(0X3 << 16)); // 设置为输出
    (*vir_moder) |= (0X1 << 16);
    // 默认关灯
    (*vir_odr) &= (~(0X1 << 8));
    return 0;
}
static void __exit mycdev_exit(void)
{
    // 取消物理内存的映射
    iounmap(vir_moder);
    iounmap(vir_odr);
    iounmap(vir_rcc);
    iounmap(vir2_moder);
    iounmap(vir2_odr);

    // 销毁设备信息
    int i;
    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");

3.测试代码

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
int main(int argc, const char *argv[])
{
    char buf[128] = {};
    int fd = open("/dev/mycdev0", O_RDWR);
    if (fd < 0)
    {
        printf("打开设备文件失败\n");
        exit(-1);
    }
    printf("成功打开设备文件\n");

    while (1)
    {
        printf("------------------------------------\n");
        printf("请输入要实现的逻辑》\n");
        printf("11:LED1亮\n");
        printf("10:LED1灭\n");
        printf("21:LED2亮\n");
        printf("20:LED2灭\n");
        printf("31:LED3亮\n");
        printf("30:LED3灭\n");
        printf("00:退出\n");
        //printf("41:顺序流水灯\n");
        //printf("40:逆向流水灯\n");
        printf("------------------------------------\n");
        fgets(buf, sizeof(buf), stdin); // 从终端读一个字符串存放在buf
        buf[strlen(buf) - 1] = '\0';
        if(strcmp(buf,"00")==0)
        {
            break;
        }
        write(fd, buf, sizeof(buf));
    }

    close(fd);
    return 0;
}

实验现象