控制三灯循环亮

demo.c

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include "myled.h"#define CNAME "myled"
unsigned int major = 0;
char kbuf[100] = "";unsigned int* rcc_virt = NULL; //定义rcc虚拟地址
gpio_t* gpioe_virt = NULL; //定义gpioe组虚拟地址
gpio_t* gpiof_virt = NULL; //定义gpiof组虚拟地址#define LED1_ON (gpioe_virt->ODR |= (0x1 << 10))
#define LED1_OFF (gpioe_virt->ODR &= (~(0x1 << 10)))#define LED2_ON (gpiof_virt->ODR |= (0x1 << 10))
#define LED2_OFF (gpiof_virt->ODR &= (~(0x1 << 10)))#define LED3_ON (gpioe_virt->ODR |= (0x1 << 8))
#define LED3_OFF (gpioe_virt->ODR &= (~(0x1 << 8)))int myled_open(struct inode *inode, struct file *file)
{printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);return 0;
}ssize_t myled_write(struct file *file, const char __user *ubuf, size_t size, loff_t *loffs)
{int ret;printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);//如果用户想写的数据大小，大于内核空间的数据大小，更正用户写的数据大小if(size > sizeof(kbuf)) size = sizeof(kbuf);//将用户空间的数据，拷贝到内核空间ret = copy_from_user(kbuf,ubuf,size);if(ret){printk("copy from user is error\n");return -EIO;}//kbuf[0] = 0   kbuf[0] = 1  kbuf[0] = 2 操作哪一盏灯// kbuf[1] = 0 灯熄灭 kbuf[1] = 1 灯点亮switch(kbuf[0]){case LED1: //0kbuf[1] == 1 ? LED1_ON : LED1_OFF;break;case LED2: //1kbuf[1] == 1 ? LED2_ON : LED2_OFF;break;case LED3: //2kbuf[1] == 1 ? LED3_ON : LED3_OFF;break;}return size;
}int myled_close (struct inode *inode, struct file *file)
{printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);return 0;
}//操作方法结构体
const struct file_operations fops = {.open = myled_open,.write = myled_write,.release = myled_close,
};//入口
static int __init demo_init(void)
{//注册字符设备驱动major = register_chrdev(0,CNAME,&fops);if(major < 0){printk("register chrdev is error\n");return -EIO;}printk("major = %d\n",major); //打印主设备号的值//rcc寄存器地址映射rcc_virt = ioremap(RCC_MP_AHB4ENSETR,4);if(rcc_virt == NULL){printk("ioremap rcc is error\n");return -EIO;}//GPIOE组寄存器地址映射gpioe_virt = ioremap(GPIOE,sizeof(gpio_t));if(gpioe_virt == NULL){printk("ioremap gpioe is error\n");return -EIO;}//GPIOF组寄存器地址映射gpiof_virt = ioremap(GPIOF,sizeof(gpio_t));if(gpiof_virt == NULL){printk("ioremap gpiof is error\n");return -EIO;}//LED1灯初始化 PE10*rcc_virt |= (0x1 << 4);//使能GPIOE组控制器[4] = 1gpioe_virt->MODER &= (~(0x3 << 20));//设置PE10引脚为输出模式 [21:20] = 01gpioe_virt->MODER |= (0x1 << 20);gpioe_virt->ODR |= (0x1 << 10); //设置PE10引脚输出低电平，LED1熄灭 [10] = 0//LED2灯初始化 PF10*rcc_virt |= (0x1 << 5);//使能GPIOF组控制器[5] = 1gpiof_virt->MODER &= (~(0x3 << 20));//设置PF10引脚为输出模式 [21:20] = 01gpiof_virt->MODER |= (0x1 << 20);gpiof_virt->ODR |= (0x1 << 10); //设置PF10引脚输出低电平，LED2熄灭 [10] = 0    //LED3灯初始化 PE8gpioe_virt->MODER &= (~(0x3 << 16));//设置PE8引脚为输出模式 [17:16] = 01gpioe_virt->MODER |= (0x1 << 16);gpioe_virt->ODR |= (0x1 << 8); //设置PE8引脚输出低电平，LED1熄灭 [8] = 0return 0;
}//出口
static void __exit demo_exit(void)
{iounmap(gpioe_virt);//取消GPIOE组寄存器地址映射iounmap(gpiof_virt);//取消GPIOF寄存器地址映射iounmap(rcc_virt);//取消rcc寄存器地址映射//注销字符设备驱动unregister_chrdev(major,CNAME);
}module_init(demo_init); //指定入口地址
module_exit(demo_exit); //指定出口地址
MODULE_LICENSE("GPL"); //许可证

test.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>int main(int argc,const char * argv[])
{char buf[128] = ""; int fd = -1;fd = open("/dev/myled",O_RDWR); //打开if(fd == -1){perror("open is error");exit(1);}//buf[0] = 0  灯熄灭 buf[0] = 1 灯点亮while(1){buf[0] = 0;write(fd,buf,sizeof(buf)); //写buf[1] = 1;write(fd,buf,sizeof(buf)); //写sleep(1);buf[1] = 0;write(fd,buf,sizeof(buf)); //写sleep(1);buf[0] = 1;write(fd,buf,sizeof(buf)); //写buf[1] = 1;write(fd,buf,sizeof(buf)); //写sleep(1);buf[1] = 0;write(fd,buf,sizeof(buf)); //写sleep(1);buf[0] = 2;write(fd,buf,sizeof(buf)); //写buf[1] = 1;write(fd,buf,sizeof(buf)); //写sleep(1);buf[1] = 0;write(fd,buf,sizeof(buf)); //写sleep(1);}close(fd); //关闭return 0;
}

myled.h

#ifndef __MYLED_H__
#define __MYLED_H__enum led{LED1, //0LED2, //1LED3, //2
};typedef struct {volatile unsigned int MODER;   // 0x00volatile unsigned int OTYPER;  // 0x04volatile unsigned int OSPEEDR; // 0x08volatile unsigned int PUPDR;   // 0x0Cvolatile unsigned int IDR;     // 0x10volatile unsigned int ODR;     // 0x14volatile unsigned int BSRR;    // 0x18volatile unsigned int LCKR;    // 0x1C volatile unsigned int AFRL;    // 0x20 volatile unsigned int AFRH;    // 0x24volatile unsigned int BRR;     // 0x28volatile unsigned int res;volatile unsigned int SECCFGR; // 0x30
}gpio_t;#define  GPIOE   (0x50006000) //GPIOE组基地址
#define  GPIOF   (0x50007000) //GPIOF组基地址 #define RCC_MP_AHB4ENSETR 0x50000A28 //RCC寄存器的物理地址#endif