구차니의 잡동사니 모음

아무튼.. 1.0.28 버전에서 잠재적 memory leak이 해결되었다는데.. 어떨런지?

[링크 : http://alsa.opensrc.org/TroubleShooting]
[링크 : http://stackoverflow.com/questions/13478861/alsa-mem-leak] << 해결책으로 conf 설정을 free 하라고 한다
   [링크 : http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=MEMORY-LEAK;hb=HEAD]

[링크 : http://www.alsa-project.org/main/index.php/Changes_v1.0.27.2_v1.0.28]
[링크 : http://www.alsa-project.org/main/index.php/Download]


ALSA 크로스 컴파일
[링크 : http://forum.falinux.com/zbxe/index.php?document_srl=531325&mid=lecture_tip] 

ALSA 다운로드 링크
driver / lib / firmware가 있는데.. 걍 lib만 하면 libasound.so가 나오는 것으로 보인다.
[링크 : ftp://ftp.alsa-project.org/pub/lib/ ]
[링크 : http://alsa.cybermirror.org/lib/] 

clock_gettime() 사용 추천

[링크 : https://man7.org/linux/man-pages/man2/gettimeofday.2.html]

[링크 : https://man7.org/linux/man-pages/man2/clock_gettime.2.html]

[링크 : https://minimonk.tistory.com/5700]

---

time_t의 경우 1초 단위로 밖에 시간을 얻을수가 없는데
gettimeofday()를 통해 timeval 구조체로 값을 받으면
ms 단위로 시간을 잴 수 있다.

clock_getres 하면 ns 단위로 해당 시스템의 시간 정밀도를 받을수 있다는데
아무리 시스템이 빨라져도 ns 단위로 타이머를 받기 힘들지도 모르겠다..

[링크 : http://linux.die.net/man/2/clock_getres]
[링크 : http://linux.die.net/man/2/gettimeofday]
[링크 : http://forum.falinux.com/zbxe/index.php?document_srl=507542]

#ifndef _LINUX_JOYSTICK_H
#define _LINUX_JOYSTICK_H

/*
 *  Copyright (C) 1996-2000 Vojtech Pavlik
 *
 *  Sponsored by SuSE
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or 
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * 
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to vojtech@suse.cz, or by paper mail:
 * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
 */

#include "linux/types.h"
#include "linux/input.h"

/*
 * Version
 */

#define JS_VERSION		0x020100

/*
 * Types and constants for reading from /dev/js
 */

#define JS_EVENT_BUTTON		0x01	/* button pressed/released */
#define JS_EVENT_AXIS		0x02	/* joystick moved */
#define JS_EVENT_INIT		0x80	/* initial state of device */

struct js_event {
	__u32 time;	/* event timestamp in milliseconds */
	__s16 value;	/* value */
	__u8 type;	/* event type */
	__u8 number;	/* axis/button number */
};

/*
 * IOCTL commands for joystick driver
 */

#define JSIOCGVERSION		_IOR('j', 0x01, __u32)				/* get driver version */

#define JSIOCGAXES		_IOR('j', 0x11, __u8)				/* get number of axes */
#define JSIOCGBUTTONS		_IOR('j', 0x12, __u8)				/* get number of buttons */
#define JSIOCGNAME(len)		_IOC(_IOC_READ, 'j', 0x13, len)			/* get identifier string */

#define JSIOCSCORR		_IOW('j', 0x21, struct js_corr)			/* set correction values */
#define JSIOCGCORR		_IOR('j', 0x22, struct js_corr)			/* get correction values */

#define JSIOCSAXMAP		_IOW('j', 0x31, __u8[ABS_MAX + 1])		/* set axis mapping */
#define JSIOCGAXMAP		_IOR('j', 0x32, __u8[ABS_MAX + 1])		/* get axis mapping */
#define JSIOCSBTNMAP		_IOW('j', 0x33, __u16[KEY_MAX - BTN_MISC + 1])	/* set button mapping */
#define JSIOCGBTNMAP		_IOR('j', 0x34, __u16[KEY_MAX - BTN_MISC + 1])	/* get button mapping */

/*
 * Types and constants for get/set correction
 */

#define JS_CORR_NONE		0x00	/* returns raw values */
#define JS_CORR_BROKEN		0x01	/* broken line */

struct js_corr {
	__s32 coef[8];
	__s16 prec;
	__u16 type;
};

/*
 * v0.x compatibility definitions
 */

#define JS_RETURN		sizeof(struct JS_DATA_TYPE)
#define JS_TRUE			1
#define JS_FALSE		0
#define JS_X_0			0x01
#define JS_Y_0			0x02
#define JS_X_1			0x04
#define JS_Y_1			0x08
#define JS_MAX			2

#define JS_DEF_TIMEOUT		0x1300
#define JS_DEF_CORR		0
#define JS_DEF_TIMELIMIT	10L

#define JS_SET_CAL		1
#define JS_GET_CAL		2
#define JS_SET_TIMEOUT		3
#define JS_GET_TIMEOUT		4
#define JS_SET_TIMELIMIT	5
#define JS_GET_TIMELIMIT	6
#define JS_GET_ALL		7
#define JS_SET_ALL		8

struct JS_DATA_TYPE {
	__s32 buttons;
	__s32 x;
	__s32 y;
};

struct JS_DATA_SAVE_TYPE_32 {
	__s32 JS_TIMEOUT;
	__s32 BUSY;
	__s32 JS_EXPIRETIME;
	__s32 JS_TIMELIMIT;
	struct JS_DATA_TYPE JS_SAVE;
	struct JS_DATA_TYPE JS_CORR;
};

struct JS_DATA_SAVE_TYPE_64 {
	__s32 JS_TIMEOUT;
	__s32 BUSY;
	__s64 JS_EXPIRETIME;
	__s64 JS_TIMELIMIT;
	struct JS_DATA_TYPE JS_SAVE;
	struct JS_DATA_TYPE JS_CORR;
};


#endif /* _LINUX_JOYSTICK_H */