头文件
#ifndef __HEAD_H__
#define __HEAD_H__
typedef struct{
unsigned int MODER;
unsigned int OTYPER;
unsigned int OSPEEDR;
unsigned int PUPDR;
unsigned int IDR;
unsigned int ODR;
}gpio_t;
#define PHY_GPIOB_ADDR 0x50003000
#define PHY_GPIOE_ADDR 0x50006000
#define PHY_GPIOF_ADDR 0x50007000
#define PHY_RCC_ADDR 0X50000A28
//功能码
#define ON _IOW('l',1,int)
#define OFF _IOW('l',0,int)
#endif
驱动程序
#include
#include
#include
#include
#include
#include "head.h"
int major;
char kbuf[128] = {0};
gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
gpio_t *vir_buzzer;
gpio_t *vir_fan;
gpio_t *vir_driver;
unsigned int *vir_rcc;
struct class *cls;
struct device *dev;
int mycdev_open(struct inode *inode, struct file *file)
{
printk("%s:%s:%d\n", __FILE__, __func__, __LINE__);
return 0;
}
long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
switch (cmd)
{
case ON:
switch (arg)
{
case 1: // LED1
vir_led1->ODR |= (0x1 << 10); // LED1开灯
break;
case 2: // LED2
vir_led2->ODR |= (0x1 << 10); // LED2开灯
break;
case 3: // LED3
vir_led3->ODR |= (0x1 << 8); // LED3开灯
break;
case 4:
vir_buzzer->ODR |= (0x1 << 6);
break;
case 5:
vir_fan->ODR |= (0x1 << 9);
break;
case 6:
vir_driver->ODR |= (0x1 << 6);
break;
}
break;
case OFF:
switch (arg)
{
case 1:
vir_led1->ODR &= (~(0X1 << 10));
break;
case 2:
vir_led2->ODR &= (~(0X1 << 10));
break;
case 3:
vir_led3->ODR &= (~(0X1 << 8));
break;
case 4:
vir_buzzer->ODR &= (~(0X1 << 6));
break;
case 5:
vir_fan->ODR &= (~(0X1 << 9));
break;
case 6:
vir_driver->ODR &= (~(0X1 << 6));
break;
}
break;
}
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变量并赋值
struct file_operations fops = {
.open = mycdev_open,
.unlocked_ioctl = mycdev_ioctl,
.release = mycdev_close,
};
int all_led_init(void)
{
//寄存器地址的映射
vir_led1 = ioremap(PHY_GPIOE_ADDR,sizeof(gpio_t));
if(vir_led1 == NULL)
{
printk("ioremap filed:%d\n",__LINE__);
return -ENOMEM;
}
vir_led2 = ioremap(PHY_GPIOF_ADDR,sizeof(gpio_t));
if(vir_led2 == NULL)
{
printk("ioremap filed:%d\n",__LINE__);
return -ENOMEM;
}
vir_led3=vir_led1;
vir_fan=vir_led1;
vir_driver=vir_led2;
vir_buzzer = ioremap(PHY_GPIOB_ADDR,sizeof(gpio_t));
if(vir_buzzer == NULL)
{
printk("ioremap filed:%d\n",__LINE__);
return -ENOMEM;
}
vir_rcc = ioremap(PHY_RCC_ADDR,4);
if(vir_rcc == NULL)
{
printk("ioremap filed:%d\n",__LINE__);
return -ENOMEM;
}
printk("物理地址映射成功\n");
//寄存器的初始化
//rcc
(*vir_rcc) |= (0x1 << 1);
(*vir_rcc) |= (0x3 << 4);
vir_led1->MODER &= (~(0x3 << 20));
vir_led1->MODER |= (0x1 << 20);
vir_led1->ODR &= (~(0x1 << 10));
vir_led2->MODER &= (~(0x3 << 20));
vir_led2->MODER |= (0x1 << 20);
vir_led2->ODR &= (~(0x1 << 10));
vir_led3->MODER &= (~(0x3 << 16));
vir_led3->MODER |= (0x1 << 16);
vir_led3->ODR &= (~(0x1 << 8));
vir_buzzer->MODER &= (~(0x3 << 12));
vir_buzzer->MODER |= (0x1 << 12);
vir_buzzer->ODR &= (~(0x1 << 6));
vir_fan->MODER &= (~(0x3 << 18));
vir_fan->MODER |= (0x1 << 18);
vir_fan->ODR &= (~(0x1 << 9));
vir_driver->MODER &= (~(0x3 << 12));
vir_driver->MODER |= (0x1 << 12);
vir_driver->ODR &= (~(0x1 << 6));
printk("寄存器初始化成功\n");
return 0;
}
static int __init mycdev_init(void)
{
// 字符设备驱动注册
major = register_chrdev(0, "buzzer", &fops);
//major = register_chrdev(0, "buzzer", &fops);
//major = register_chrdev(0, "buzzer", &fops);
//major = register_chrdev(0, "buzzer", &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);
// 向上提交目录
cls = class_create(THIS_MODULE, "my");
if (IS_ERR(cls))
{
printk("向上提交目录失败\n");
return -PTR_ERR(cls);
}
printk("向上提交目录成功\n");
// 向上提交设备节点信息
dev = device_create(cls, NULL, MKDEV(major, 0), NULL, "my");
if (IS_ERR(dev))
{
printk("向上提交设备节点信息失败\n");
return -PTR_ERR(dev);
}
printk("向上提交设备节点信息成功\n");
// 寄存器映射以及初始化
all_led_init();
return 0;
}
static void __exit mycdev_exit(void)
{
// 取消地址映射
iounmap(vir_led1);
iounmap(vir_led2);
iounmap(vir_led3);
iounmap(vir_buzzer);
iounmap(vir_fan);
iounmap(vir_driver);
iounmap(vir_rcc);
// 销毁节点信息
device_destroy(cls, MKDEV(major, 0));
// 销毁目录信息
class_destroy(cls);
// 注销字符设备驱动
unregister_chrdev(major, "buzzer");
}
module_init(mycdev_init);
module_exit(mycdev_exit);
MODULE_LICENSE("GPL");
应用程序
#include
#include
#include
#include
#include
#include
#include
#include
#include"head.h"
int main(int argc, char const *argv[])
{
int a,b;
int fd=open("/dev/my",O_RDWR);
if(fd<0)
{
printf("打开设备文件失败\n");
exit(-1);
}
while(1)
{
//从终端读取
printf("请输入要控制的硬件 1(LED1) 2(LED2) 3(LED3) 4(buzzer) 5(fan) 6(driver)>");
scanf("%d",&b);
printf("请输入指令0(关) 1(开)\n");
scanf("%d",&a);
switch(a)
{
case 1:
ioctl(fd,ON,b);
break;
case 0:
ioctl(fd,OFF,b);
break;
}
}
close(fd);
return 0;
}