驱动开发点亮led灯

头文件

#ifndef __HEAD_H__
#define __HEAD_H__#define PHY_LED_MODER 0X50006000
#define PHY_LED_ODR 0X50006014
#define PHY_LED_RCC 0X50000A28
#define PHY_LED_FMODER 0X50007000
#define PHY_LED_FODR 0X50007014#endif

驱动代码

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include "head.h"
#include <linux/io.h>
#include <linux/device.h>unsigned int major;
char kbuf[128] = {0};
unsigned int *vir_moder;
unsigned int *vir_fmoder;
unsigned int *vir_rcc;
unsigned int *vir_odr;
unsigned int *vir_fodr;
struct class *clz;
struct device *dev;int myDev_open(struct inode *major, struct file *file)
{printk("%s:%s,%d\n", __FILE__, __func__, __LINE__);return 0;
}ssize_t myDev_write(struct file *file, const char *ubuf, size_t size, loff_t *lof)
{int ret;ret = copy_from_user(kbuf, ubuf, size);if (ret){printk("copy_from_user failed!\n");return ret;}switch (kbuf[0]){case '1'://pe10if (kbuf[1] == '1'){(*vir_odr) |= (0x1 << 10);}else if (kbuf[1] == '0'){(*vir_odr) &= (~(0x1 << 10));}break;case '2'://pe8if (kbuf[1] == '1'){(*vir_fodr) |= (0x1 << 10);}else if (kbuf[1] == '0'){(*vir_fodr) &= (~(0x1 << 10));}break;case '3'://pf10if (kbuf[1] == '1'){(*vir_odr) |= (0x1 << 8);}else if (kbuf[1] == '0'){(*vir_odr) &= (~(0x1 << 8));}break;default:break;}return 0;
}ssize_t myDev_read(struct file *file, char *ubuf, size_t size, loff_t *lof)
{int ret;ret = copy_to_user(ubuf, kbuf, size);if (ret){printk("copy_to_user failed!\n");return ret;}return 0;
}int myDev_close(struct inode *major, struct file *file)
{printk("myDev_close\n");return 0;
}struct file_operations fop = {.open = myDev_open,.release = myDev_close,.read = myDev_read,.write = myDev_write};static int __init mydev_init(void)
{int i = 0;major = register_chrdev(0, "myCharDev", &fop);if (major < 0){printk("设备注册失败\n");return major;}printk("设备注册成功！major=%d\n", major);vir_moder = ioremap(PHY_LED_MODER, 4);if (vir_moder == NULL){printk("内存映射失败%d\n", __LINE__);return -EFAULT;}vir_fmoder = ioremap(PHY_LED_FMODER, 4);if (vir_fmoder == NULL){printk("内存映射失败%d\n", __LINE__);return -EFAULT;}vir_rcc = ioremap(PHY_LED_RCC, 4);if (vir_rcc == NULL){printk("内存映射失败%d\n", __LINE__);return -EFAULT;}vir_odr = ioremap(PHY_LED_ODR, 4);if (vir_odr == NULL){printk("内存映射失败%d\n", __LINE__);return -EFAULT;}vir_fodr = ioremap(PHY_LED_FODR, 4);if (vir_fodr == NULL){printk("内存映射失败%d\n", __LINE__);return -EFAULT;}// pe10(*vir_moder) &= (~(0x3 << 20));(*vir_moder) |= (0x1 << 20);// pe8(*vir_moder) &= (~(0x3 << 16));(*vir_moder) |= (0x1 << 16);// pf10(*vir_fmoder) &= (~(0x3 << 20));(*vir_fmoder) |= (0x1 << 20);(*vir_rcc) |= (0x1 << 4);(*vir_rcc) |= (0x1 << 5);(*vir_odr) &= (~(0x1 << 10));(*vir_odr) &= (~(0x1 << 8));(*vir_fodr) &= (~(0x1 << 10));clz = class_create(THIS_MODULE, "mydev");if (IS_ERR(clz)){printk("提交目录失败\n");return -PTR_ERR(clz);}printk("提交目录成功\n");for (i = 0; i < 3; i++){dev = device_create(clz, NULL, MKDEV(major, i), NULL, "mydev%d", i);if (IS_ERR(dev)){printk("提交设备节点信息失败\n");return -PTR_ERR(clz);}}printk("提交设备节点信息成功\n");return 0;
}static void __exit mydev_exit(void)
{printk("mydev_exit\n");iounmap(vir_moder);iounmap(vir_rcc);iounmap(vir_odr);iounmap(vir_fmoder);iounmap(vir_fodr);int i;for (i = 0; i < 3; i++){device_destroy(clz, MKDEV(major, i));}class_destroy(clz);unregister_chrdev(major, "myCharDev");
}module_init(mydev_init);
module_exit(mydev_exit);
MODULE_LICENSE("GPL");

测试代码

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>int main()
{char buf[128];int fd = open("/dev/mydev0", O_RDWR);if (fd < 0){perror("open failed!\n");exit(-1);}printf("打开设备成功！\n");while (1){printf("请输入led灯的逻辑》\n");printf("11:led1亮\n");printf("10:led1灭\n");printf("21:led2亮\n");printf("20:led2灭\n");printf("31:led3亮\n");printf("30:led3灭\n");fgets(buf, sizeof(buf), stdin);buf[strlen(buf) - 1] = '\0';write(fd, buf, sizeof(buf));}close(fd);return 0;
}