#include
#include
#include
#include
#include
#include
#include "myled.h"
#include
int main(int argc, char const *argv[])
{
char buf[128] = {};
int which,off;
int fd = open("/dev/my_led0", O_RDWR);
if (fd < 0)
{
printf("打开设备文件失败\n");
exit(-1);
}
printf("打开设备成功\n");
//在终端输入
int fd1 = open("/dev/my_led1", O_RDWR);
if (fd1 < 0)
{
printf("打开设备文件失败\n");
exit(-1);
}
printf("打开设备成功\n");
//在终端输入
int fd2 = open("/dev/my_led2", O_RDWR);
if (fd2 < 0)
{
printf("打开设备文件失败\n");
exit(-1);
}
printf("打开设备成功\n"); //在终端输入
//在终端输入
while (1)
{
printf("请输入控制命令 1开灯 0:关灯\n");
fgets(buf, sizeof(buf), stdin);
//吃掉换行符
buf[strlen(buf) - 1] = '\0';
printf("请输入要操作的灯1-->led1,2-->led2,3-->led3\n");
scanf("%d", &which);
getchar();
if (which == 1)
{
ioctl(fd, led_ON, &which);
}
else if (which == 2)
{
ioctl(fd1, led_ON, &which);
}
else if (which == 3)
{
ioctl(fd2, led_ON, &which);
}
else if (which == 4)
{
ioctl(fd2, led_ON, &which);
}
else if (which == 5)
{
ioctl(fd2, led_ON, &which);
}
else if (which == 6)
{
ioctl(fd2, led_ON, &which);
}
else if (which == 11)
{
ioctl(fd2, led_OFF, &which);
}
else if (which == 12)
{
ioctl(fd2, led_OFF, &which);
}
else if (which == 13)
{
ioctl(fd2, led_OFF, &which);
}
else if (which == 14)
{
ioctl(fd2, led_OFF, &which);
}
else if (which == 15)
{
ioctl(fd2, led_OFF, &which);
}
else if (which == 16)
{
ioctl(fd2, led_OFF, &which);
}
}
close(fd);
close(fd1);
close(fd2);
return 0;
}
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "myled.h"
#define CNAME "myled"
int minor=0;//次设备号从0开始
#if 0
unsigned int major = 0;//动态申请
#else
unsigned int major = 500;//静态指定设备号
#endif
char kbuf[128] = {}; //定义数组用于存放和用户之间拷贝的数据
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
gpio_t *vir_fan1;
gpio_t *vir_sp1;
gpio_t *vir_m1;
unsigned int *vir_rcc_apb1;
unsigned int *vir_rcc_apb2;
unsigned int *vir_rcc;
struct class *cls; //句柄
struct device *dev;
struct cdev *cdev;//分配字符设备对象
const int count=3;//设备节点个数为3
//对应的是open()
int mycdev_open(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
// read()
ssize_t mycdev_read(struct file *file, char __user *ubuf, size_t size, loff_t *loff)
{
// size参数是用户期待读到的字节长度
int ret;
if (size > sizeof(kbuf))
size = sizeof(kbuf);
ret = copy_to_user(ubuf, kbuf, size);
if (ret)
{
printk("数据从内核向用户拷贝失败\n");
return -EIO;
}
return size;
}
// write()
ssize_t mycdev_write(struct file *file, const char __user *ubuf, size_t size, loff_t *loff)
{
int ret;
if (size > sizeof(kbuf))
size = sizeof(kbuf);
ret = copy_from_user(kbuf, ubuf, size);
if (ret)
{
printk("数据从内核向用户拷贝失败\n");
return -EIO;
}
/*if(kbuf[0]=='1')//开灯
vir_led1->ODR |= (1<<10);
else if(kbuf[0]=='2')
vir_led2->ODR |= (1 << 10);
else if(kbuf[0]=='3')
vir_led3->ODR |= (1 << 8);
else//关灯
{
vir_led1->ODR &= ~(1<<10);
vir_led2->ODR&= ~(1 << 10);
vir_led3->ODR &= ~(1 << 8);
}*/
return size;
}
// close()
long ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
// cmd是传输过来的功能模块,arg是传递过来的第三个参数,选择是哪个灯的
// file对应着文件描述符文件
int which, ret;
switch (cmd)
{
case led_ON:
{
ret = copy_from_user(&which, (void *)arg, sizeof(int)); //获取发送的数据是否成功
if (ret)
{
printk("数据向内核拷贝失败\n");
return -EIO;
}
switch (which)
{
case 11:
vir_led1->ODR |= (1 << 10);
break;
case 12:
vir_led2->ODR |= (1 << 10);
break;
case 13:
vir_led3->ODR |= (1 << 8);
break;
case 14:
vir_m1->ODR |= (1 << 6);
break;
case 15:
vir_fan1->ODR |= (1 << 9);
break;
case 16:
vir_sp1->ODR |= (1 << 6);
break;
}
break;
}
case led_OFF:
{
ret = copy_from_user(&which, (void *)arg, sizeof(int));
if (ret)
{
printk("用户向内核拷贝数据失败\n");
return -EIO;
}
switch (which)
{
case LED1:
vir_led1->ODR &= ~(1 << 10);
break;
case LED2:
vir_led2->ODR &= ~(1 << 10);
break;
case LED3:
vir_led3->ODR &= ~(1 << 8);
break;
case M1:
vir_m1->ODR &= ~(1 << 6);
break;
case FAN1:
vir_fan1->ODR &= ~(1 << 9);
break;
case SP1:
vir_sp1->ODR &= ~(1 << 6);
break;
}
break;
}
default:
printk("功能码错误\n");
break;
}
return 0;
}
int mycdev_close(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
//操作方法结构体的初始化
struct file_operations fops =
{
.open = mycdev_open,
.read = mycdev_read,
.write = mycdev_write,
.unlocked_ioctl = ioctl,
.release = mycdev_close,
};
int all_led_init(void)
{
//进行物理地址的映射
vir_led1 = ioremap(PHY_LED1_ADDR, sizeof(gpio_t));
if (vir_led1 == NULL)
{
printk("vir_led1 映射失败\n");
return -ENOMEM;
}
printk("vir_led1 映射成功\n");
vir_led2 = ioremap(PHY_LED2_ADDR, sizeof(gpio_t));
if (vir_led2 == NULL)
{
printk("vir_led2 映射失败\n");
return -ENOMEM;
}
printk("vir_led2 映射成功\n");
vir_led3 = ioremap(PHY_LED3_ADDR, sizeof(gpio_t));
if (vir_led3 == NULL)
{
printk("vir_led3 映射失败\n");
return -ENOMEM;
}
printk("vir_led3 映射成功\n");
vir_rcc = ioremap(PHY_RCC_ADDR, 4);
if (vir_rcc == NULL)
{
printk("vir_rcc 映射失败\n");
return -ENOMEM;
}
//apb1
vir_rcc_apb1 = ioremap(PHY_RCC_APB1, 4);
if (vir_rcc_apb1 == NULL)
{
printk("vir_rcc_apb1 映射失败\n");
return -ENOMEM;
}
printk("vir_rcc_apb1 映射成功\n");
//apb2
vir_rcc_apb2 = ioremap(PHY_RCC_APB2, 4);
if (vir_rcc_apb2 == NULL)
{
printk("vir_rcc_apb2 映射失败\n");
return -ENOMEM;
}
printk("vir_rcc_apb2 映射成功\n");
//风扇
vir_fan1 = ioremap(PHY_FAN1_ADDR, sizeof(gpio_t));
if (vir_fan1 == NULL)
{
printk("vir_fan1 映射失败\n");
return -ENOMEM;
}
printk("vir_fan1 映射成功\n");
// m1
vir_m1 = ioremap(PHY_M1_ADDR, sizeof(gpio_t));
if (vir_m1 == NULL)
{
printk("vir_m1 映射失败\n");
return -ENOMEM;
}
printk("vir_m1 映射成功\n");
// sp1
vir_sp1 = ioremap(PHY_SP1_ADDR, sizeof(gpio_t));
if (vir_sp1 == NULL)
{
printk("vir_sp1 映射失败\n");
return -ENOMEM;
}
printk("vir_sp1 映射成功\n");
//寄存器的初始化
// led1
vir_led1->MODER &= ~(3 << 20);
vir_led1->MODER |= (1 << 20);
vir_led1->ODR &= ~(1 << 10);
// led2
vir_led2->MODER &= ~(3 << 20);
vir_led2->MODER |= (1 << 20);
vir_led2->ODR &= ~(1 << 10);
// led3
vir_led3->MODER &= ~(3 << 16);
vir_led3->MODER |= (1 << 16);
vir_led3->ODR &= ~(1 << 8);
// fan1
vir_fan1->MODER &= ~(3 << 18);
vir_fan1->MODER |= (1 << 18);
vir_fan1->ODR &= ~(1 << 9);
// sp1
vir_sp1->MODER &= ~(3 << 12);
vir_sp1->MODER |= (1 << 12);
vir_sp1->ODR &= ~(1 << 6);
// m1
vir_m1->MODER &= ~(3 << 12);
vir_m1->MODER |= (1 << 12);
vir_m1->ODR &= ~(1 << 6);
//使能TIM寄存器
(*vir_rcc) |= (3 << 4);
(*vir_rcc_apb1) |= (1 << 2); //使能TIM4
(*vir_rcc_apb2) |= (1 << 0); //使能TIM1
(*vir_rcc_apb2) |= (1 << 3); //使能TIM16
(*vir_rcc) |= (1 << 1); //使能gpiob
return 0;
}
//入口函数,当驱动安装的时候执行
static int __init demo_init(void)
{
//动态注册字符设备驱动
/*/ major = register_chrdev(0, CNAME, &fops);
if (major < 0)
{
printk("字符设备驱动注册失败\n");
return major;
}
printk("字符设备驱动注册成功major=%d\n", major);*/
//分配设备对象空间
int ret,i;
//分配对象
dev_t devno;
cdev=cdev_alloc();
if(cdev==NULL)
{
printk("cdev alloc memory err\n");
ret = -ENOMEM;
goto ERR1;
}
printk("对象分配成功\n");
//对象的初始化
cdev_init(cdev,&fops);
//设备号的申请
if(major==0)//动态申请
{
ret=alloc_chrdev_region(&devno,minor,count,"my_led");
if(ret)
{
printk("动态申请设备号失败\n");
goto ERR2;
}
major = MAJOR(devno);
minor = MINOR(devno);
printk("动态申请设备号成功\n");
}
else
{
ret=register_chrdev_region(MKDEV(major,minor),count,"my_led");
if(ret)
{
printk("静态申请设备号失败\n");
goto ERR2;
}
printk("静态申请设备号成功\n");
}
//注册字符设备驱动
ret=cdev_add(cdev,MKDEV(major,minor),count);
if(ret)
{
printk("字符设备驱动注册失败\n");
goto ERR3;
}
printk("注册字符设备驱动成功\n");
//自动创建设备节点
cls = class_create(THIS_MODULE,"led");
if(IS_ERR(cls))
{
printk("创建逻辑节点目录失败\n");
ret=PTR_ERR(cls);
goto ERR4;
}
printk("创建逻辑节点目录成功\n");
//向上提交节点信息
for(i=0;i<3;i++)
{
dev = device_create(cls,NULL,MKDEV(major,i),NULL,"my_led%d",i);
if(IS_ERR(dev))
{
printk("创建逻辑节点失败\n");
ret = PTR_ERR(dev);
goto ERR5;
}
}
printk("创建逻辑节点成功\n");
//寄存器的初始化
all_led_init();
return 0;
ERR5:
for(--i;i>=0;i--)
{
device_destroy(cls,MKDEV(major,i));
}
class_destroy(cls);
ERR4:
cdev_del(cdev);
ERR3:
unregister_chrdev_region(MKDEV(major,minor),count);
ERR2:
kfree(cdev);
ERR1:
return ret;
}
//出口函数,卸载驱动的时候执行
static void __exit demo_exit(void)
{
///1.销毁设备节点
int i;
for(i=0;i
device_destroy(cls,MKDEV(major,i));
}
class_destroy(cls);
//2.注销字符设备驱动
cdev_del(cdev);
//3.释放设备号
unregister_chrdev_region(MKDEV(major,minor),count);
//取消映射
iounmap(vir_led1);
iounmap(vir_led2);
iounmap(vir_led3);
iounmap(vir_rcc);
iounmap(vir_m1);
iounmap(vir_fan1);
iounmap(vir_sp1);
iounmap(vir_rcc_apb1);
iounmap(vir_rcc_apb2);
//4.释放动态申请的空间
kfree(cdev);
}
module_init(demo_init);
module_exit(demo_exit);
MODULE_LICENSE("GPL");