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Diffstat (limited to 'rawjoystick.c')
| -rw-r--r-- | rawjoystick.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/rawjoystick.c b/rawjoystick.c new file mode 100644 index 0000000..73dce1e --- /dev/null +++ b/rawjoystick.c @@ -0,0 +1,185 @@ +/* +'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); +} |