//head.h
#ifndef __LED_H__
#define __LED_H__
#define PHY_LED1_MODER 0X50006000
#define PHY_LED1_ODR 0X50006014
#define PHY_LED1_RCC 0X50000A28
#define PHY_LED2_MODER 0X50007000
#define PHY_LED2_ODR 0X50007014
#define PHY_LED2_RCC 0X50000A28
#define PHY_LED3_MODER 0X50006000
#define PHY_LED3_ODR 0X50006014
#define PHY_LED3_RCC 0X50000A28
#endif
//驱动
#include
#include
#include
#include
#include "head.h"
unsigned int major;//定义一个变量保存主设备号
char kbuf[128]={0};
unsigned int* vir_led1_moder;
unsigned int* vir_led1_odr;
unsigned int* vir_led1_rcc;
unsigned int* vir_led2_moder;
unsigned int* vir_led2_odr;
unsigned int* vir_led2_rcc;
unsigned int* vir_led3_moder;
unsigned int* vir_led3_odr;
unsigned int* vir_led3_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){
long ret;
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
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){
long ret;
printk("%s:%s:%d\n",__FILE__,__func__,__LINE__);
ret=copy_from_user(kbuf,ubuf,size);
if(ret){
printk("copy_from_user filed\n");
return -EIO;
}
//判断用户输入的数据，进行不同的硬件逻辑执行
if(kbuf[0]=='0')//关灯
{
//关灯逻辑
(*vir_led1_odr) &= (~(0x1<<10));
(*vir_led2_odr) &= (~(0x1<<10));
(*vir_led3_odr) &= (~(0x1<<8));
}
else if(kbuf[0]=='1'){
//开灯
if(kbuf[1]=='1'){
(*vir_led1_odr) |= (0x1<<10);
}
else if(kbuf[1]=='0'){
(*vir_led1_odr) &= (~(0x1<<10));
}
}
else if(kbuf[0]=='2'){
//开灯
if(kbuf[1]=='1'){
(*vir_led2_odr) |= (0x1<<10);
}
else if(kbuf[1]=='0'){
(*vir_led2_odr) &= (~(0x1<<10));
}
}
else if(kbuf[0]=='3'){
//开灯
if(kbuf[1]=='1'){
(*vir_led3_odr) |= (0x1<<8);
}
else if(kbuf[1]=='0'){
(*vir_led3_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("注册字符设备驱动失败\n");
return major;
}
printk("注册字符设备驱动成功\n");
vir_led1_moder=ioremap(PHY_LED1_MODER,4);
if(vir_led1_moder == NULL){
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
vir_led1_odr=ioremap(PHY_LED1_ODR,4);
if(vir_led1_odr==NULL){
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
vir_led1_rcc=ioremap(PHY_LED1_RCC,4);
if(vir_led1_rcc==NULL){
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
(*vir_led1_rcc)|=(0x1<<4);
(*vir_led1_moder)&=(~(0x3<<20));
(*vir_led1_moder)|=(0x1<<20);
(*vir_led1_odr)&=(~(0x1<<10));
vir_led2_moder=ioremap(PHY_LED2_MODER,4);
if(vir_led2_moder == NULL){
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
vir_led2_odr=ioremap(PHY_LED2_ODR,4);
if(vir_led2_odr==NULL){
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
vir_led2_rcc=ioremap(PHY_LED2_RCC,4);
if(vir_led2_rcc==NULL){
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
(*vir_led2_rcc)|=(0x1<<5);
(*vir_led2_moder)&=(~(0x3<<20));
(*vir_led2_moder)|=(0x1<<20);
(*vir_led2_odr)&=(~(0x1<<10));
vir_led3_moder=ioremap(PHY_LED3_MODER,4);
if(vir_led3_moder == NULL){
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
vir_led3_odr=ioremap(PHY_LED3_ODR,4);
if(vir_led3_odr==NULL){
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
vir_led3_rcc=ioremap(PHY_LED3_RCC,4);
if(vir_led3_rcc==NULL){
printk("映射物理内存失败%d\n",__LINE__);
return -EFAULT;
}
printk("映射物理内存成功\n");
//硬件寄存器的初始化
(*vir_led3_rcc)|=(0x1<<4);
(*vir_led3_moder)&=(~(0x3<<16));
(*vir_led3_moder)|=(0x1<<16);
(*vir_led3_odr)&=(~(0x1<<8));
printk("硬件寄存器初始化成功\n");
return 0;
}
static void __exit mycdev_exit(void)
{
printk("注销字符设备驱动\n");
unregister_chrdev(major,"mychrdev");
}
//用于向内核报备当前内核模块入口函数的地址
module_init(mycdev_init);
//用于向内核报备当前内核模块出口函数的地址
module_exit(mycdev_exit);
//生命当前内核模块遵循GPL协议
MODULE_LICENSE("GPL");
//应用层
#include
#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");
exit(-1);
}
while(1){
printf("请输入控制命令: 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;
}
