驱动开发day1
头文件
#ifndef __HEAD_H__
#define __HEAD_H__
#define PHY_LED1_MODER 0X50006000
#define PHY_LED1_ODR 0X50006014
#define PHY_LED2_MODER 0x50007000
#define PHY_LED2_ODR 0x50007014
#define PHY_LED3_MODER 0x50006000
#define PHY_LED3_ODR 0x50006014
#define PHY_RCC 0X50000A28
#endifdemo1.c
#include
#include
#include
#include
#include
#include "head.h"
unsigned int major;
char kbuf[128]={};
//定义指针指向映射后的虚拟内存
unsigned int *vir_moder1;
unsigned int *vir_odr1;
unsigned int *vir_moder2;
unsigned int *vir_odr2;
unsigned int *vir_moder3;
unsigned int *vir_odr3;
unsigned int *vir_rcc;
//封装操作方法
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 *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[1] == '0')
{
// 关灯逻辑
if (kbuf[0] == '1')
(*vir_odr1) &= (~(0X1<<10));
else if (kbuf[0] == '2')
(*vir_odr2) &= (~(0X1<<10));
else if (kbuf[0] == '3')
(*vir_odr3) &= (~(0X1<<8));
}
else if (kbuf[1] == '1')
{
// 开灯逻辑
if (kbuf[0] == '1')
(*vir_odr1) |= (0X1<<10);
else if (kbuf[0] == '2')
(*vir_odr2) |= (0X1<<10);
else if (kbuf[0] == '3')
(*vir_odr3) |= (0X1<<8);
}
return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
return 0;
}
//定义操作方法结构体对象
struct file_operations fops = {
.open=mycdev_open,
.read=mycdev_read,
.write=mycdev_write,
.release=mycdev_close,
};
//入口函数，安装内核模块时执行
static int __init mycdev_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");
}
printk("注册字符设备驱动成功major=%d\n",major);
// 进行寄存器的地址映射
vir_moder1 = ioremap(PHY_LED1_MODER, 4);
if (vir_moder1 == NULL)
{
printk("物理内存地址映射失败%d\n", __LINE__);
return -EFAULT;
}
vir_odr1 = ioremap(PHY_LED1_ODR, 4);
if (vir_odr1 == 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");
//LED1寄存器初始化
(*vir_rcc) |= (0X3<<4);//GPIOE控制器时钟使能
(*vir_moder1) &= (~(0X3<<20));//MODER[21:20]->00
(*vir_moder1) |= (0X1<<20);//MODER[21:20]->01
(*vir_odr1) &= (~(0X1<<10));//默认关灯
vir_moder2 = ioremap(PHY_LED2_MODER, 4);
if (vir_moder2 == 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_odr2 == NULL)
{
printk("物理内存地址映射失败%d\n", __LINE__);
return -EFAULT;
}
//LED2
(*vir_moder2) &= (~(0X3<<20));//MODER[21:20]->00
(*vir_moder2) |= (0X1<<20);//MODER[21:20]->01
(*vir_odr2) &= (~(0X1<<10));//默认关灯
vir_moder3 = ioremap(PHY_LED3_MODER, 4);
if (vir_moder3 == NULL)
{
printk("物理内存地址映射失败%d\n", __LINE__);
return -EFAULT;
}
vir_odr3 = ioremap(PHY_LED3_ODR, 4);
if (vir_odr3 == NULL)
{
printk("物理内存地址映射失败%d\n", __LINE__);
return -EFAULT;
}
//LED3
(*vir_moder3) &= (~(0X3<<16));//MODER[21:20]->00
(*vir_moder3) |= (0X1<<16);//MODER[21:20]->01
(*vir_odr3) &= (~(0X1<<8));//默认关灯
return 0;
}
//出口函数，卸载内核模块时执行
static void __exit mycdev_exit(void)
{
//取消内存映射
iounmap(vir_moder1);
iounmap(vir_odr1);
iounmap(vir_moder2);
iounmap(vir_odr2);
iounmap(vir_moder3);
iounmap(vir_odr3);
iounmap(vir_rcc);
//注销字符设备驱动
unregister_chrdev(major,"mychrdev");
}
//用于声明入口函数
module_init(mycdev_init);
//用于声明出口函数
module_exit(mycdev_exit);
//声明当前内核模块遵循GPL协议
MODULE_LICENSE("GPL");
text.c
#include
#include
#include
#include
#include
#include
int main(int argc, char const *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("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';
//调用write
write(fd, buf, sizeof(buf));
//memset(buf, 0, sizeof(buf));
//read(fd, buf, sizeof(buf));
//printf("buf:%s\n",buf);
}
//调用close
close(fd);
return 0;
}