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cat /sys/class/gpio/gpio14/value

// 朝向
#define	 OUT							"out"
#define	 IN							"in"

#define EXPORT_PATH						"/sys/class/gpio/export"

/**
* @brief 门禁检测引脚
*/

#define DEV_PATH_DOOR_DETE					"/sys/class/gpio/gpio14/value"
#define DIRECT_PATH_DOOR_DETE				"/sys/class/gpio/gpio14/direction"
#define GPIO_DOOR_DETE						"14"

static int init_detect_io(char *export_path, char *dev_path, char *direct_path, char *gpio);

static int fd_dev = -1;

void drv_door_detect_init(void)
{
	fd_dev = init_detect_io(EXPORT_PATH, DEV_PATH_DOOR_DETE, DIRECT_PATH_DOOR_DETE, GPIO_DOOR_DETE);
}

static int init_detect_io(char *export_path, char *dev_path, char *direct_path, char *gpio)
{
	// 打开GPIO设备导出设备
	int fd_export = open(export_path, O_WRONLY);
	if (fd_export < 0)
	{
		perror("open export");
		return 0;
	}
	// 向export文件写入GPIO排列序号字符串
	write(fd_export, gpio, strlen(gpio));
	close(fd_export);

	// 打开GPIO输入输出控制设备
	int fd_dir = open(direct_path, O_RDWR);
	if (fd_dir < 0)
	{
		perror("open direction");
		return 0;
	}

	// 设置输出方向
	write(fd_dir, IN, strlen(IN));
	close(fd_dir);

	// 打开GPIO输入输出控制设备
	int ret = -1;
	ret = open(dev_path, O_RDONLY);
	if (ret < 0)
	{
		perror("open dev");
		return 0;
	}

	return ret;
}
/**
* @brief 检测门磁信号
* @note
* @retval 1或者0. 门磁断路检测到0，门磁通路检测到1
*/

bool drv_door_detect(void)
{
	char level[2] = {0};
	bool door_state;
	int ret = -1;

	ret = read(fd_dev, level, sizeof(level));
	if(ret < 0)
	{
		perror("read error\n");
		return 0;
	}

	if (level[0] == '0')
	{
		door_state = false;
	}
	else
	{
		door_state = true;
	}


	return door_state;
}