华清远见上海中心22071班

#include

#include

#include

#include

#include

#include "led.h"

#define CNAME "led"

volatile gpio_t *GPIOE=NULL;

volatile gpio_t *GPIOF=NULL;

int major;

char kbuf[128] = {0};

volatile unsigned int* virt_rcc;

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 __user *ubuf, size_t size, loff_t *loffs)

{

    int ret;

    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);

    //校验传输数据大小，如果用户空间传输数据的大小大于内核空间，需要更正传输数据大小

    if(size > sizeof(kbuf)) size = sizeof(kbuf);

    ret = copy_to_user(ubuf,kbuf,size);

    if(ret)

    {

        printk("copy from user is error\n");

        return -EIO;

    }

    return size;

}

ssize_t mycdev_write(struct file *file, const char __user *ubuf, size_t size, loff_t *loffs)

{

    int ret;

    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);

    //1.校验传输数据大小，如果用户空间传输数据的大小大于内核空间，需要更正传输数据大小

    if(size > sizeof(kbuf)) size = sizeof(kbuf);

    ret = copy_from_user(kbuf,ubuf,size);

    if(ret)

    {

        printk("copy from user is error\n");

        return -EIO;

    }

    printk("copy from user kbuf = %s\n",kbuf);

    //2.实现灯点亮和熄灭的过程

    if(kbuf[0] == '1') //操作哪一盏灯

    {

        if(kbuf[1] == '1')

        {

            GPIOE->ODR |= (0x1 << 10); //led1输出高电平

            GPIOF->ODR |= (0x1 << 10); //led2输出搞电平

            GPIOE->ODR |= (0x1 << 8);  //led3输出高电平

        }

        else if(kbuf[1] == '0')

        {

            GPIOE->ODR &= (~(0x1 << 10));//led1输出低电平

            GPIOE->ODR &= (~(0x1 << 8));//led3输出低电平

            GPIOF->ODR &= (~(0x1 << 10));//led2输出低电平

        }

    }

    return size;

}

int  mycdev_close(struct inode *inode, struct file *file)

{

    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);

    return 0;

}

const struct file_operations fops = {

        .open = mycdev_open,

        .read = mycdev_read,

        .write = mycdev_write,

        .release = mycdev_close,

};

//入口

static int __init mycdev_init(void)

{

    //1.注册字符设备驱动

    major = register_chrdev(0,CNAME,&fops);

    if(major < 0)

    {

        printk("register chrdev is error\n");

        return major;

    }    

    printk("major=%d\n",major);

    //2.将LED1物理地址映射为虚拟地址

    //1)将rcc地址进行映射

    virt_rcc = ioremap(PHY_RCC,4);

    if(NULL == virt_rcc)

    {

        printk("rcc ioremap is error\n");

        return -ENOMEM;

    }

    //2)将GPIO_MODER地址进行映射

    GPIOE = ioremap(IGPIOE,sizeof(gpio_t));

    GPIOF = ioremap(IGPIOF,sizeof(gpio_t));

    //3.将LED1--->PE10引脚初始化

    //将GPIOE时钟使能

    *virt_rcc |= (0x1 << 4);

    //将GPIOE时钟使能

    *virt_rcc |= (0x1 << 5);

    //设置PE10引脚为输出模式

    GPIOE->MODER &= (~(0x3 << 20));

    GPIOE->MODER |= (0x1 << 20);

   

    //设置Pf10引脚为输出模式

    GPIOF->MODER &= (~(0x3 << 20));

    GPIOF->MODER |= (0x1 << 20);

    //设置Pe8引脚为输出模式

    GPIOE->MODER &= (~(0x3 << 16));

    GPIOE->MODER |= (0x1 << 16);

    //3)设置PE10引脚默认为低电平

    GPIOE->ODR &= (~(0x1 << 10));

    GPIOE->ODR &= (~(0x1 << 8));

    GPIOF->ODR &= (~(0x1 << 10));

    return 0;

}

//出口

static void __exit mycdev_exit(void)

{

    //2.注销字符设备驱动

    unregister_chrdev(major,CNAME);

}

module_init(mycdev_init);

module_exit(mycdev_exit);

//许可证

MODULE_LICENSE("GPL");

 

#ifndef __LED_H__

#define __LED_H__

#define PHY_GPIO_MODER 0x50006000

#define PHY_GPIO_ODR 0x50006014

#define PHY_RCC  0x50000A28

#define IGPIOE 0x50006000

#define IGPIOF 0x50007000

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;

}gpio_t;

#endif

 

#include

#include

#include

#include

#include

#include

#include

char buf[128] = {""};

int main(int argc, char const *argv[])

{

    int fd = -1;

    fd = open("/dev/myled",O_RDWR);

    if(-1 == fd)

    {

        perror("open is error");

        exit(1);

    }

    while(1)

    {

        buf[0] = '1';

        write(fd,buf,sizeof(buf));

        buf[1] = '1';

        write(fd,buf,sizeof(buf));

        sleep(1);

        buf[1] = '0';

        write(fd,buf,sizeof(buf));

        sleep(1);

    }

    close(fd);

    return 0;

}