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/*
'pd_joystick' (An external library for Miller Puckette's 'PD' software
adding PC and/or USB joystick control capabilities)
Copyright (C) 2001 Joseph A. Sarlo
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
jsarlo@peabody.jhu.edu
*/
#include "m_pd.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#ifdef USB
#define JOYSTICK_DEVICE "/dev/input/js0"
#else
#define JOYSTICK_DEVICE "dev/js0"
#endif
// scaling factor for output
#define DEF_SCALE 1
// delay/refresh time in milliseconds
#define DEF_DELTIME 5
// this object handles a maximum of 10 axes
#define MAX_AXIS_OUTS 10
// input event types
#define JS_EVENT_BUTTON 0x01
#define JS_EVENT_AXIS 0x02
#define JS_EVENT_INIT 0x80
// ise ioctl() to get number of axes and buttons from device
#define JSIOCGAXES _IOR('j', 0x11, unsigned char)
#define JSIOCGBUTTONS _IOR('j', 0x12, unsigned char)
struct js_event
{
unsigned int time;
signed short value;
unsigned char type;
unsigned char number;
};
typedef struct _joystick
{
t_object t_ob;
struct js_event x_joy_e;
int x_joy_fd;
float x_scale;
float x_translation;
t_outlet *x_axis_out[10];
t_outlet *x_button_num_out;
t_outlet *x_button_val_out;
t_clock *x_clock;
double x_deltime;
unsigned char x_joy_buttons;
unsigned char x_joy_axes;
}t_joystick;
t_class *joystick_class;
void *joystick_new(t_float deltime, t_float scale, t_float translation);
void joystick_setup(void);
void joystick_read(t_joystick *x);
void joystick_change_deltime(t_joystick *x, t_float deltime);
void joystick_free(t_joystick *x);
void *joystick_new(t_float deltime, t_float scale, t_float translation)
{
int i, num_axes;
t_joystick *x = (t_joystick *)pd_new(joystick_class);
// open the joystick device read-only, non-exclusive
x->x_joy_fd = open (JOYSTICK_DEVICE, O_RDONLY | O_NONBLOCK);
// read js_events from the JOYSTICK_DEVICE stream
while (read (x->x_joy_fd, &(x->x_joy_e), sizeof(struct js_event)) > -1);
// if deltime is set in the object's creation arguments
// use that value, otherwise use the default
if (deltime == 0)
x->x_deltime = DEF_DELTIME;
else
x->x_deltime = (int)deltime;
// if scale is set in the object's creation arguments
// use that value, otherwise use the default
if (scale == 0)
x->x_scale = DEF_SCALE;
else
x->x_scale = scale;
// get translation from object arguments
x->x_translation = translation;
x->x_joy_axes = 0;
x->x_joy_buttons = 0;
// get number of axes and buttons from device
ioctl (x->x_joy_fd, JSIOCGAXES, &(x->x_joy_axes));
ioctl (x->x_joy_fd, JSIOCGBUTTONS, &(x->x_joy_buttons));
// this object handles a maximum of MAX_AXIS_OUTS axes
// if there are more, limit to MAX_AXIS_OUTS
if (x->x_joy_axes > MAX_AXIS_OUTS)
num_axes = MAX_AXIS_OUTS;
else
num_axes = x->x_joy_axes;
// create outlets for each axis
for (i = 0; i < num_axes; i++)
x->x_axis_out[i] = outlet_new(&x->t_ob, &s_float);
// create outlets for buttons
x->x_button_num_out = outlet_new(&x->t_ob, &s_float);
x->x_button_val_out = outlet_new(&x->t_ob, &s_float);
x->x_clock = clock_new (x, (t_method)joystick_read);
clock_delay (x->x_clock, x->x_deltime);
post ("configuring joystick:");
post (" found %d axes", x->x_joy_axes);
post (" found %d buttons", x->x_joy_buttons);
return (void *)x;
}
void joystick_setup(void)
{
post ("joystick object loaded (J. Sarlo)");
joystick_class = class_new(gensym("joystick"),(t_newmethod)joystick_new,
(t_method)joystick_free, sizeof(t_joystick), 0, A_DEFFLOAT, A_DEFFLOAT,
A_DEFFLOAT, 0);
class_addfloat(joystick_class, joystick_change_deltime);
}
void joystick_read(t_joystick *x)
{
int rt;
while (read (x->x_joy_fd, &(x->x_joy_e), sizeof(struct js_event)) > -1)
{
if (x->x_joy_e.type == JS_EVENT_AXIS)
{
outlet_float (x->x_axis_out[x->x_joy_e.number],
((int)x->x_joy_e.value + x->x_translation) / x->x_scale);
}
else if (x->x_joy_e.type == JS_EVENT_BUTTON)
{
outlet_float (x->x_button_val_out, x->x_joy_e.value);
outlet_float (x->x_button_num_out, x->x_joy_e.number);
}
}
clock_delay (x->x_clock, x->x_deltime);
}
void joystick_change_deltime(t_joystick *x, t_float deltime)
{
if (deltime < 0)
deltime = 0;
x->x_deltime = deltime;
}
void joystick_free(t_joystick *x)
{
close (x->x_joy_fd);
clock_free (x->x_clock);
}
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