驱动9.07

 实现三盏灯的控制，编写应用程序测试

head.h

#ifndef __HEAD_H__
#define __HEAD_H__
 
//PE10
#define LED1_RCC    0X50000A28
#define LED1_MODER  0X50006000
#define LED1_ODR    0X50006014
 
//PF10
#define LED2_RCC    0X50000A28
#define LED2_MODER  0X50007000
#define LED2_ODR    0X50007014
 
#endif

mychrdev.c 

#include 
#include 
#include 
#include 
#include "head.h"
#include
 
 
char kbuf[128] = {0};
 
unsigned int *vir_rcc;
unsigned int *vir_moder;
unsigned int *vir_odr;
 
unsigned int *vir_rcc_f;
unsigned int *vir_moder_f;
unsigned int *vir_odr_f;
 
//定义操作方法
int mychrdev_open(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    return 0;
}
 
ssize_t mychrdev_read(struct file *file, char *ubuf, size_t size, loff_t *lof)
{
    int ret;
    ret = copy_to_user(ubuf,kbuf,sizeof(kbuf));
    if(ret)
    {
        printk("copy_to_user err\n");
        return -EIO;
    }
 
    return 0;
}
 
ssize_t mychrdev_write(struct file *file, const char *ubuf, size_t size, loff_t *lof)
{
    int ret;
    ret = copy_from_user(kbuf,ubuf,sizeof(ubuf));
    if(ret)
    {
        printk("copy_from_user err\n");
        return -EIO;
    }
    
    //PE10
    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));
    }
 
    //PF10
    if(kbuf[1] == '1')       //开灯
    {
        //开灯逻辑
        (*vir_odr_f) |= (0x1 << 10);
        printk("%d\n",__LINE__);
    }
    else if(kbuf[1] == '0')  //关灯
    {
        //关灯逻辑
        (*vir_odr_f) &= (~(0x1 << 10));
    }
 
    //PE8
    if(kbuf[2] == '1')       //开灯
    {
        //开灯逻辑
        (*vir_odr) |= (0x1 << 8);
    }
    else if(kbuf[2] == '0')  //关灯
    {
        //关灯逻辑
        (*vir_odr) &= (~(0x1 << 8));
    }
 
    return 0;
}
 
int mychrdev_close(struct inode *inode, struct file *file)
{
    printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
    return 0;
}
 
//定义存放主设备号变量
unsigned int major;
 
//定义操作方法的结构体变量
struct file_operations fops={
    .open = mychrdev_open,
    .read = mychrdev_read,
    .write = mychrdev_write,
    .release = mychrdev_close
};
 
static int __init mycdev_init(void)
{
    //字符设备驱动注册
    major = register_chrdev(0,"mychrdev",&fops);
    if(major < 0)
    {
        printk("字符设备注册失败\n");
    }
    printk("字符设备注册成功:%d\n",major);
 
    //相关寄存器的内存映射
    //GPIOE
    vir_rcc = ioremap(LED1_RCC,4);
    if(vir_rcc == NULL)
    {   
        printk("物理地址映射失败%d\n",__LINE__);
    }
 
    vir_moder = ioremap(LED1_MODER,4);
    if(vir_moder == NULL)
    {   
        printk("物理地址映射失败%d\n",__LINE__);
    }
 
    vir_odr = ioremap(LED1_ODR,4);
    if(vir_odr == NULL)
    {   
        printk("物理地址映射失败%d\n",__LINE__);
    }
 
    //GOIOF
    vir_rcc = ioremap(LED2_RCC,4);
    if(vir_rcc == NULL)
    {   
        printk("物理地址映射失败%d\n",__LINE__);
    }
 
    vir_moder_f = ioremap(LED2_MODER,4);
    if(vir_moder_f == NULL)
    {   
        printk("物理地址映射失败%d\n",__LINE__);
    }
 
    vir_odr_f = ioremap(LED2_ODR,4);
    if(vir_odr_f == NULL)
    {   
        printk("物理地址映射失败%d\n",__LINE__);
    }
 
    printk("物理地址映射成功\n");
 
    //相关寄存器的初始化
    //RCC寄存器
    (*vir_rcc) |= (0x1 << 4);
 
    //GPIOE_MODER寄存器(PE10)
    (*vir_moder) &= (~(0x3 << 20));
    (*vir_moder) |= (0x1 << 20);
    //GPIOE_ODR寄存器
    (*vir_odr) &= (~(0x1 << 10));
 
    //RCC寄存器(PF10)
    (*vir_rcc) |= (0x1 << 5);
    //GPIOF_MODER寄存器
    (*vir_moder_f) &= (~(0x3 << 20));
    (*vir_moder_f) |= (0x1 << 20);
    //GPIOF_ODR寄存器
    (*vir_odr_f) &= (~(0x1 << 10));
 
    //GPIOE_MODER寄存器(PE8)
    (*vir_moder) &= (~(0x3 << 16));
    (*vir_moder) |= (0x1 << 16);
    //GPIOE_ODR寄存器
    (*vir_odr) &= (~(0x1 << 8));
 
    return 0;
}
 
static void __exit mycdev_exit(void)
{
    //取消物理地址映射
    iounmap(vir_rcc);
    iounmap(vir_moder);
    iounmap(vir_odr);
 
    iounmap(vir_rcc_f);
    iounmap(vir_moder_f);
    iounmap(vir_odr_f);
 
    //字符设备驱动注销
    unregister_chrdev(major,"mychrdev");
}
 
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

test.c

#include 
#include 
#include 
#include 
#include 
#include 
#include 
 
int main(int args,char const *argv[])
{
    char buf[128] = {0};
    int fd = open("/dev/mychrdev",O_RDWR);
 
    if(fd < 0)
    {
        printf("打开文件失败\n");
        exit(-1);
    }
 
    while(1)
    {
        printf("输入指令控制开/关灯(LED1|LED2|LED3)----0(OFF)、1(ON)>");
        fgets(buf,sizeof(buf),stdin);
        buf[strlen(buf)-1] = '\0';
        write(fd,buf,sizeof(buf));
    }
 
    close(fd);
    
    return 0;
}

测试现象

111->LED1,LED2,LED3全部点亮

010->LED1,LED3熄灭 LED2点亮