驱动day2作业

编写应用程序控制三盏灯亮灭

head.h

#ifndef __HEAD_H__
#define __HEAD_H__
#define PHY_LED1_MODER 0x50006000
#define PHY_LED2_MODER 0x50007000
#define PHY_LED1_ODR 0x50006014
#define PHY_LED2_ODR 0x50007014
#define PHY_RCC 0x50000A28#endif

demo1.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]={};
unsigned int *vir_moder;
unsigned int *vir_moder2;
unsigned int *vir_odr;
unsigned int *vir_odr2;
unsigned int *vir_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 *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 filed\n");return -EIO;}return 0;
}
ssize_t mycdev_write(struct file *file,const char *ubuf,size_t size,loff_t *lof)
{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')//全灭{(*vir_odr) &= (~(0x1 << 10));(*vir_odr2) &= (~(0x1 << 10));(*vir_odr) &= (~(0x1 << 8));}else if(kbuf[0] == '1')//LED1亮{(*vir_odr) |= (0x1 << 10);}else if(kbuf[0] == '2')//LED2亮{(*vir_odr2) |= (0x1 << 10);}else if(kbuf[0] == '3')//LED3亮{(*vir_odr) |= (0x1 << 8);}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=mycdev_write,.release=mycdev_close,
};
static int __init mycdev_init(void)
{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);vir_moder = ioremap(PHY_LED1_MODER,4);if(vir_moder == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}vir_moder2 = ioremap(PHY_LED2_MODER,4);if(vir_moder == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}vir_odr = ioremap(PHY_LED1_ODR,4);if(vir_odr == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}vir_odr2 = ioremap(PHY_LED2_ODR,4);if(vir_odr == NULL){printk("物理内存地址映射失败%d\n", __LINE__);return -EFAULT;}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 -EFAULT;}printk("寄存器内存映射成功\n");//rcc使能GPIOE、GPIOF(*vir_rcc) |= (0x1 << 4);(*vir_rcc) |= (0x1 << 5);//moder 设PE10 PF10 PE8为输出模式(*vir_moder) &= (~(0x3 << 20));(*vir_moder) |= (0x1 << 20);(*vir_moder) &= (~(0x3 << 16));(*vir_moder) |= (0x1 << 16);(*vir_moder2) &= (~(0x3 << 20));(*vir_moder2) |= (0x1 << 20);//odr 设PE10 PF10 PE8默认输出0(*vir_odr) &= (~(0x1 << 10));(*vir_odr) &= (~(0x1 << 8));(*vir_odr2) &= (~(0x1 << 10));return 0;
}
static void __exit mycdev_exit(void)
{iounmap(vir_moder);iounmap(vir_odr);iounmap(vir_rcc);iounmap(vir_moder2);iounmap(vir_odr2);unregister_chrdev(major,"mychrdev");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");

text.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,const char * argv[])
{char buf[128] = {0};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("請輸入要進行的操作：0（全关）1（LED1开）2（LED2开）3（LED3开）>");fgets(buf,sizeof(buf),stdin);buf[strlen(buf)-1]='\0';write(fd,buf,sizeof(buf));}close(fd);return 0;
}