小灯亮灭）"/>
驱动开发day2（编程实现LED三盏小灯亮灭）
头文件（head.h）：
#ifndef __HEAD_H__
#define __HEAD_H__
#define PHY_LED1_MODER 0x50006000
#define PHY_LED2_MODER 0x50007000
#define PHY_LED3_MODER 0x50006000
#define PHY_LED1_ODR 0x50006014
#define PHY_LED2_ODR 0x50007014
#define PHY_LED3_ODR 0x50006014
#define PHY_RCC 0x50000A28#endif 驱动文件（demo.c）：
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include "head.h"
unsigned int major;
char kbuf[128]="";
//LED1:PE10 LED2:PF10 LED3:PE8
//定义RCC控制器指针指向映射后的虚拟内存
unsigned int *vir_rcc;
//LED1定义两个指针指向映射后的虚拟内存
unsigned int *vir_moder_led1;
unsigned int *vir_odr_led1;
//LED2定义两个指针指向映射后的虚拟内存
unsigned int *vir_moder_led2;
unsigned int *vir_odr_led2;
//LED3定义两个指针指向映射后的虚拟内存
unsigned int *vir_moder_led3;
unsigned int *vir_odr_led3;
//封装方法
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 *loff)
{printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);int ret;ret=copy_to_user(ubuf,kbuf,size);if(ret){printk("copy_to_user filed\n");return -EIO;}return 0;
}
ssize_t mydev_write(struct file *file,const char *ubuf,size_t size,loff_t *loff)
{printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);int ret;ret=copy_from_user(kbuf,ubuf,size);if(ret){printk("copy_from_user filed\n");return -EIO;}if(kbuf[0] == '0')//关灯{//关灯逻辑(*vir_odr_led1)&=(~(0x1 << 10)); //LED1默认关灯(*vir_odr_led2)&=(~(0x1 << 10)); //LED2默认关灯(*vir_odr_led3)&=(~(0x1 << 8)); //LED3默认关灯}else if (kbuf[0] == '1'){//开灯逻辑(*vir_odr_led1) |= (0x1 << 10); //LED1开灯(*vir_odr_led2) |= (0x1 << 10); //LED2开灯(*vir_odr_led3) |= (0x1 << 8); //LED3开灯}return 0;
}
int mycdev_close(struct inode *inode,struct file *file)
{printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);return 0;
}
struct file_operations fops = {.open=mycdev_open,.read=mycdev_read,.write=mydev_write,.release=mycdev_close,};
static int __init mydev_init(void)
{//注册字符设备驱动major = register_chrdev(0,"mychrdev", &fops);if(major < 0){printk("字符设备驱动注册失败\n");return major;}printk("注册字符设备驱动成功major=%d\n",major);//RCC控制器地址映射vir_rcc = ioremap(PHY_RCC,4);if(vir_rcc == NULL){printk("物理内存地址映射失败%d\n",__LINE__);return -1;}//LED1进行寄存器的地址映射vir_moder_led1 = ioremap(PHY_LED1_MODER,4);if(vir_moder_led1 == NULL){printk("物理内存地址映射失败%d\n",__LINE__);return -1;}vir_odr_led1 = ioremap(PHY_LED1_ODR,4);if(vir_odr_led1 == NULL){printk("物理内存地址映射失败%d\n",__LINE__);return -1;}printk("LED1寄存器内存映射成功");//LED2进行寄存器的地址映射vir_moder_led2 = ioremap(PHY_LED2_MODER,4);if(vir_moder_led2 == NULL){printk("物理内存地址映射失败%d\n",__LINE__);return -1;}vir_odr_led2 = ioremap(PHY_LED2_ODR,4);if(vir_odr_led2 == NULL){printk("物理内存地址映射失败%d\n",__LINE__);return -1;}printk("LED2寄存器内存映射成功");//LED3进行寄存器的地址映射vir_moder_led3 = ioremap(PHY_LED3_MODER,4);if(vir_moder_led3 == NULL){printk("物理内存地址映射失败%d\n",__LINE__);return -1;}vir_odr_led3 = ioremap(PHY_LED3_ODR,4);if(vir_odr_led3 == NULL){printk("物理内存地址映射失败%d\n",__LINE__);return -1;}printk("LED3寄存器内存映射成功");//RCC寄存器初始化(*vir_rcc) |= (0x3 << 4);//GPIOE/GPIOF控制器时钟使能//LED1寄存器初始化(*vir_moder_led1) &= (~(0x3 << 20));//MODER[21:20]->00(*vir_moder_led1) |= (0x1 << 20);//MODER[21:20]->01(*vir_odr_led1) &= (~(0x1 << 10));//默认关灯//LED2寄存器初始化(*vir_moder_led2) &= (~(0x3 << 20));//MODER[21:20]->00(*vir_moder_led2) |= (0x1 << 20);//MODER[21:20]->01(*vir_odr_led2) &= (~(0x1 << 10));//默认关灯//LED3寄存器初始化(*vir_moder_led3) &= (~(0x3 << 16));//MODER[17:16]->00(*vir_moder_led3) |= (0x1 << 16);//MODER[17:16]->01(*vir_odr_led3) &= (~(0x1 << 8));//默认关灯return 0;
}
static void __exit mydev_exit(void)
{//取消RCC控制器内存映射iounmap(vir_rcc);//取消LED1内存映射iounmap(vir_moder_led1);iounmap(vir_odr_led1);//取消LED2内存映射iounmap(vir_moder_led2);iounmap(vir_odr_led2);//取消LED3内存映射iounmap(vir_moder_led3);iounmap(vir_odr_led3);//注销字符设备驱动unregister_chrdev(major,"mychrdev");
}
module_init(mydev_init);
module_exit(mydev_exit);
MODULE_LICENSE("GPL"); c文件（test.c）：
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
int main(int argc, char const *argv[])
{char buf[128]="";int fd=open("/dev/mychrdev",O_RDWR);if(fd<0){ printf("打开设备文件失败\n");return -1; } printf("打开设备文件成功\n");while(1){ printf("请输入要进行的操作,0(关灯),1(开灯) >");fgets(buf,sizeof(buf),stdin);buf[strlen(buf)-1]='\0';write(fd,buf,sizeof(buf));} close(fd);return 0;
}
效果图：
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驱动开发day2（编程实现LED三盏小灯亮灭）
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