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flightgear/Joystick/joystick.c
curt a657dc248b Initial revision.
1997-08-29 18:03:19 +00:00

241 lines
5.9 KiB
C
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/**************************************************************************
* joystick.h -- joystick support
*
* Written by Michele America, started September 1997.
*
* Copyright (C) 1997 Michele F. America - nomimarketing@mail.telepac.pt
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
* (Log is kept at end of this file)
**************************************************************************/
#ifdef HAVE_JOYSTICK
#include <linux/joystick.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#endif
static joy_x_min=0, joy_x_ctr=0, joy_x_max=0;
static joy_y_min=0, joy_y_ctr=0, joy_y_max=0;
static joy_x_dead_min=1000, joy_x_dead_max=-1000;
static joy_y_dead_min=1000, joy_y_dead_max=-1000;
static int joystick_fd;
int fgJoystickInit( int joy_num )
{
#ifdef HAVE_JOYSTICK
int status;
char *fname;
struct JS_DATA_TYPE js;
int button;
/* argument should be 0 or 1 */
if( joy_num != 1 && joy_num != 0 ) {
perror( "js" );
return( 1 );
}
/* pick appropriate device file */
if (joy_num == 0)
fname = "/dev/js0";
if (joy_num == 1)
fname = "/dev/js1";
/* open device file */
joystick_fd = open(fname, O_RDONLY);
if (joystick_fd < 0) {
perror ("js");
return( 1 );
}
printf( "\nMove joystick around dead spot and press any joystick button.\n" );
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
button = js.buttons & 1 || js.buttons & 2;
while(button == 0 ) {
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
button = js.buttons & 1 || js.buttons & 2;
if( js.x > joy_x_dead_max )
joy_x_dead_max = js.x;
if( js.x < joy_x_dead_min )
joy_x_dead_min = js.x;
if( js.y > joy_y_dead_max )
joy_y_dead_max = js.y;
if( js.y < joy_y_dead_min )
joy_y_dead_min = js.y;
// printf( "Xmin %d Xmax %d Ymin %d Ymax %d", joy_x_dead_min, joy_x_dead_max, \
// joy_y_dead_min, joy_y_dead_max );
}
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
printf("\nJoystick calibration: X_dead_min = %d, X_dead_max = %d\n", joy_x_dead_min, joy_x_dead_max );
printf(" Y_dead_min = %d, Y_dead_max = %d\n", joy_y_dead_min, joy_y_dead_max );
sleep( 1 );
printf( "\nCenter joystick and press any joystick button.\n" );
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
button = js.buttons & 1 || js.buttons & 2;
while(button == 0 ) {
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
button = js.buttons & 1 || js.buttons & 2;
}
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
joy_x_ctr = js.x;
joy_y_ctr = js.y;
printf("Joystick calibration: X_ctr = %d, Y_ctr = %d\n", joy_x_ctr, joy_y_ctr );
sleep( 1 );
printf( "\nMove joystick to upper left and press any joystick button.\n" );
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
button = js.buttons & 1 || js.buttons & 2;
while(button == 0 ) {
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
button = js.buttons & 1 || js.buttons & 2;
}
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
joy_x_min = js.x;
joy_y_min = js.y;
printf("Joystick calibration: X_min = %d, Y_min = %d\n", joy_x_min, joy_y_min );
sleep( 1 );
printf( "\nMove joystick to lower right and press any joystick button.\n" );
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
button = js.buttons & 1 || js.buttons & 2;
while(button == 0 ) {
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
button = js.buttons & 1 || js.buttons & 2;
}
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
joy_x_max = js.x;
joy_y_max = js.y;
printf("Joystick calibration: X_max = %d, Y_max = %d\n", joy_x_max, joy_y_max );
// joy_x_ctr = (joy_x_max-joy_x_min)/2;
// joy_y_ctr = (joy_y_max-joy_y_min)/2;
// printf("Joystick calibration: X_ctr = %d, Y_ctr = %d\n", joy_x_ctr, joy_y_ctr );
return( joystick_fd );
#endif
}
/* void fgJoystickCalibrate( int joy_fd )
{
} */
int fgJoystickRead( double *joy_x, double *joy_y, int *joy_b1, int *joy_b2 )
{
#ifdef HAVE_JOYSTICK
struct JS_DATA_TYPE js;
int status;
status = read(joystick_fd, &js, JS_RETURN);
if (status != JS_RETURN) {
perror("js");
return( 1 );
}
/* printf("\n button 0: %s button 1: %s X position: %4d Y position: %4d\n",
(js.buttons & 1) ? "on " : "off",
(js.buttons & 2) ? "on " : "off",
js.x,
js.y ); */
if( js.x >= joy_x_dead_min && js.x <= joy_x_dead_max )
*joy_x = 0.5;
else
*joy_x = (double)js.x/(double)(joy_x_max-joy_x_min);
*joy_x = *joy_x*2-1;
if( js.y >= joy_y_dead_min && js.y <= joy_y_dead_max )
*joy_y = 0.5;
else
*joy_y = (double)js.y/(double)(joy_y_max-joy_y_min);
*joy_y = *joy_y*2-1;
*joy_b1 = js.buttons & 1;
*joy_b2 = js.buttons & 2;
return( 0 );
#endif
}
/* $Log$
/* Revision 1.1 1997/08/29 18:06:54 curt
/* Initial revision.
/*
*/
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