建设门户网站多少钱,做网站的公司搞什么活动,聚商网络营销公司服务内容,无锡微信网站建设//编译驱动(注意Makefile的编译到移植到开发板的内核) make archarm //清除编译生成文件 make clean //安装驱动 insmod mycdev.ko //卸载驱动 rmmod mycdev //编译fun.c 函数(用到交叉工具编译) arm-linux-gnueabihf-gcc fun.c head.h
#ifndef __HEAD_H__
#define __HEAD_H__… //编译驱动(注意Makefile的编译到移植到开发板的内核) make archarm //清除编译生成文件 make clean //安装驱动 insmod mycdev.ko //卸载驱动 rmmod mycdev //编译fun.c 函数(用到交叉工具编译) arm-linux-gnueabihf-gcc fun.c head.h
#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_LED1_ADDR 0X50006000
#define PHY_LED2_ADDR 0X50007000
#define PHY_LED3_ADDR 0X50006000
#define PHY_RCC_ADDR 0X50000A28// 功能码
#define LED_ON _IOW(1, 1, int)
#define LED_OFF _IOW(1, 0, int)#endif // MACROmycdev.c
#include linux/init.h
#include linux/module.h
#include linux/fs.h
#include linux/io.h
#include linux/device.h
#include linux/uaccess.h
#include linux/slab.h
#include linux/cdev.h
#include head.hstruct cdev *cdev;
struct class *cls;
struct device *dev;char kbuf[128] {0};
unsigned int major 500;
unsigned int minor 0; // 次设备号的起始值
dev_t devnum;gpio_t *vir_led1;
gpio_t *vir_led2;
gpio_t *vir_led3;
unsigned int *vir_rcc;
// 定义一个自旋锁
spinlock_t lock;int mycdev_open(struct inode *inode, struct file *file)
{int a inode-i_rdev;file-private_data (void *)MINOR(a);printk(%s:%s:%d\n, __FILE__, __func__, __LINE__);return 0;
}long mycdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{unsigned int which;which (unsigned int)file-private_data;// copy_from_user(which,(void *)arg,4);// 上锁spin_lock(lock);switch (cmd){case LED_ON:switch (which){case 0: // LED1vir_led1-ODR | (0x1 10); // LED1开灯break;case 1: // LED2vir_led2-ODR | (0x1 10); // LED2开灯break;case 2: // LED3vir_led3-ODR | (0x1 8); // LED3开灯break;}break;case LED_OFF:switch (which){case 0:vir_led1-ODR (~(0X1 10));break;case 1:vir_led2-ODR (~(0X1 10));break;case 2:vir_led3-ODR (~(0X1 8));break;}break;}// 解锁spin_unlock(lock);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,.release mycdev_close,.unlocked_ioctl mycdev_ioctl,
};int all_led_init(void)
{// 寄存器地址的映射vir_led1 ioremap(PHY_LED1_ADDR, sizeof(gpio_t));if (vir_led1 NULL){printk(ioremap filed%d\n, __LINE__);return -ENOMEM;}vir_led2 ioremap(PHY_LED2_ADDR, sizeof(gpio_t));if (vir_led2 NULL){printk(ioremap filed%d\n, __LINE__);return -ENOMEM;}vir_led3 vir_led1;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) | (3 4);// led1vir_led1-MODER (~(3 20));vir_led1-MODER | (1 20);vir_led1-ODR (~(1 10));// led2vir_led2-MODER (~(3 20));vir_led2-MODER | (1 20);vir_led2-ODR (~(1 10));// led3vir_led3-MODER (~(3 16));vir_led1-MODER | (1 16);vir_led1-ODR (~(1 8));printk(寄存器初始化成功\n);return 0;
}static int __init mycdev_init(void)
{int ret, i;// 初始化上锁spin_lock_init(lock);// 1.申请对象空间cdev cdev_alloc();if (NULL cdev){printk(wangsong申请对象空间失败\n);ret -EFAULT;goto OUT1;}printk(wangsong申请对象空间成功\n);// 2.初始化对象cdev_init(cdev, fops);printk(wangsong初始化对象成功\n);// 3.申请设备号if (0 major){ret alloc_chrdev_region(devnum, minor, 3, wangsong);if (ret){printk(wangsong动态申请设备号失败\n);goto OUT2;}major MAJOR(devnum);minor MINOR(devnum);}else{ret register_chrdev_region(MKDEV(major, minor), 3, wangsong);if (ret){printk(wangsong静态申请设备号失败\n);goto OUT2;}}printk(wangsong申请设备号成功\n);// 4.注册驱动对象ret cdev_add(cdev, MKDEV(major, minor), 3);if (ret){printk(wangsong注册驱动对象失败\n);goto OUT3;}printk(wangsong注册驱动对象成功\n);// 5.向上提交目录cls class_create(THIS_MODULE, wangsong);if (IS_ERR(cls)){printk(wangsong向上提交目录失败\n);goto OUT4;}printk(wangsong向上提交目录成功\n);// 6.向上提交设备信息for (i 0; i 3; i){dev device_create(cls, NULL, MKDEV(major, i), NULL, wangsong%d, i);if (IS_ERR(dev)){printk(wangsong向上提交设备节点失败\n);ret -PTR_ERR(dev);goto OUT5;}}printk(wangsong向上提交设备节点成功\n);// 寄存器映射以及初始化all_led_init();return 0;
OUT5:for (--i; i 0; i--){device_destroy(cls, MKDEV(major, i));}class_destroy(cls);OUT4:cdev_del(cdev);OUT3:unregister_chrdev_region(MKDEV(major, minor), 3);OUT2:kfree(cdev);OUT1:return ret;
}
static void __exit mycdev_exit(void)
{int i;// 取消地址映射iounmap(vir_led1);iounmap(vir_led2);iounmap(vir_rcc);// 1.销毁设备信息for (i 0; i 3; i){device_destroy(cls, MKDEV(major, i));printk(wangsong销毁设备信息成功\n);}// 2.销毁目录class_destroy(cls);printk(wangsong销毁目录成功\n);// 3.注销驱动对象cdev_del(cdev);printk(wangsong注销驱动对象成功\n);// 4.释放设备号unregister_chrdev_region(MKDEV(major, minor), 3);printk(wangsong释放设备号成功\n);// 5.释放对象空间kfree(cdev);printk(wangsong释放对象空间成功\n);
}module_init(mycdev_init);module_exit(mycdev_exit);MODULE_LICENSE(GPL);fun.c
#include stdio.h
#include unistd.h
#include sys/types.h
#include sys/stat.h
#include fcntl.h
#include stdlib.h
#include sys/ioctl.h
#include string.h
#include head.hint main(int argc, char const *argv[])
{/* code */int a, b;char buf[128] {0};printf(调用open\n);int fd0 open(/dev/wangsong0, O_RDWR);if (fd0 0){printf(打开设备文件失败\n);exit(-1);}int fd1 open(/dev/wangsong1, O_RDWR);if (fd1 0){printf(打开设备文件失败\n);exit(-1);}int fd2 open(/dev/wangsong2, O_RDWR);if (fd2 0){printf(打开设备文件失败\n);exit(-1);}while (1){// 从终端读取printf(请输入要点亮的灯号(1-3)操作(0[灭]、1[亮])[exit退出程序]:);fgets(buf, sizeof(buf), stdin);buf[strlen(buf) - 1] \0;if (!strcmp(buf, exit))break;a (int)buf[1] - 48;b (int)buf[0] - 48;printf(a%d,b%d, a, b);if (a 1){switch (b){case 1:if (ioctl(fd0, LED_ON, b)){printf(开灯失败\n);}break;case 2:if (ioctl(fd1, LED_ON, b)){printf(开灯失败\n);}break;case 3:if (ioctl(fd2, LED_ON, b)){printf(开灯失败\n);}break;default:printf(格式错误请重新输入\n);}}else{switch (b){case 1:if (ioctl(fd0, LED_OFF, b)){printf(关灯失败\n);}break;case 2:if (ioctl(fd1, LED_OFF, b)){printf(关灯失败\n);}break;case 3:if (ioctl(fd2, LED_OFF, b)){printf(关灯失败\n);}break;default:printf(格式错误请重新输入\n);}}}printf(调用close\n);close(fd0);close(fd1);close(fd2);return 0;
}Makefile
modname ? mycdevarch ? armifeq ($(arch),arm)
KERNELDIR: /home/ubuntu/13_UBOOT/linux-stm32mp-5.10.61-stm32mp-r2-r0/linux-5.10.61
else
KERNELDIR:/lib/modules/$(shell uname -r)/build/
endifPWD:$(shell pwd)all:make -C $(KERNELDIR) M$(PWD) modulesclean:make -C $(KERNELDIR) M$(PWD) cleanobj-m:$(modname).o
