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/*
wacom graphire on serial port only...
*/
#include <m_pd.h>
#include <s_stuff.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#define BUFSIZE 256
#define HEADER_BIT 0x80
#define ZAXIS_SIGN_BIT 0x40
#define ZAXIS_BIT 0x04
#define ZAXIS_BITS 0x3f
#define POINTER_BIT 0x20
#define PROXIMITY_BIT 0x40
#define BUTTON_FLAG 0x08
#define BUTTONS_BITS 0x78
#define TILT_SIGN_BIT 0x40
#define TILT_BITS 0x3f
/* defines to discriminate second side button and the eraser */
#define ERASER_PROX 4
#define OTHER_PROX 1
#define Threshold 1000
unsigned char data[7];
typedef struct _wac
{
t_object t_ob;
t_outlet *axis_out;
t_outlet *button_out;
t_symbol *file;
int fd;
int count;
int oldbuttons;
unsigned char data[BUFSIZE];
}t_wac;
t_class *wac_class;
void wac_setup(void);
static void wac_read(t_wac *x,int fd);
static void wac_process(t_wac *x);
static void wac_open(t_wac *x)
{
if(x->fd>=0) return;
x->fd = open (x->file->s_name, O_RDONLY | O_NONBLOCK);
if(x->fd<0){
post("open (%s, O_RDONLY | O_NONBLOCK)",x->file->s_name);
perror("open");
return;
}
sys_addpollfn(x->fd,(t_fdpollfn)wac_read,(void*)x);
}
static void wac_close(t_wac *x)
{
if(x->fd<0) return;
sys_rmpollfn(x->fd);
close(x->fd);
x->fd=-1;
}
static void wac_float(t_wac *x,t_floatarg connect)
{
if(connect!=0) wac_open(x);
else wac_close(x);
}
static void *wac_new(t_symbol *file)
{
t_wac *x = (t_wac *)pd_new(wac_class);
//if(file->s_name)
if(file!=&s_)
x->file=file;
else x->file=gensym("/dev/ttyS0");
post("wac_new file=%s",x->file->s_name);
x->axis_out = outlet_new(&x->t_ob, &s_list);
x->button_out = outlet_new(&x->t_ob, &s_list);
x->fd=-1;
return (void *)x;
}
void wac_setup(void)
{
wac_class = class_new(gensym("wac"),(t_newmethod)wac_new,
(t_method)wac_close, sizeof(t_wac), 0, A_DEFSYM, 0);
class_addfloat(wac_class, wac_float);
}
static void wac_read(t_wac *x,int fd)
{
int len,i=0;
unsigned char b;
unsigned char buffer[BUFSIZE];
while((len=read(fd,buffer,BUFSIZE))> -1){
for(i=0;i<len;i++){
if(buffer[i]&128) x->count=0;
x->data[x->count++]=buffer[i];
if(x->count==7) wac_process(x);
}
}
}
static void wac_process(t_wac *X)
{
int is_stylus = 1, is_button, is_proximity, wheel=0;
int x, y, z, buttons, tx = 0, ty = 0;
unsigned char *data=X->data;
t_atom ats[3];
is_stylus = (data[0] & POINTER_BIT);
if(!is_stylus) return;
x = (((data[0] & 0x3) << 14) +
(data[1] << 7) +
data[2]);
y = (((data[3] & 0x3) << 14) +
(data[4] << 7) +
data[5]);
z = ((data[6] & ZAXIS_BITS) * 2) +
((data[3] & ZAXIS_BIT) >> 2);
//z = z*4 + ((data[0] & ZAXIS_BIT) >> 1);
if (!(data[6] & ZAXIS_SIGN_BIT)) {
z += 128;
}
is_proximity = (data[0] & PROXIMITY_BIT);
buttons = ((data[3] & 0x38) >> 3);
/*if (is_stylus) {
buttons = ((data[3] & 0x30) >> 3) |
(z >= Threshold ? 1 : 0);
}
else {
buttons = (data[3] & 0x38) >> 3;
wheel = (data[6] & 0x30) >> 4;
if (data[6] & 0x40) {
wheel = -wheel;
}
}*/
//is_button = (buttons != 0);
if(buttons!=X->oldbuttons)
{
X->oldbuttons=buttons;
SETFLOAT(&ats[0],buttons&1);
SETFLOAT(&ats[1],(buttons&2)!=0);
SETFLOAT(&ats[2],(buttons&4)!=0);
outlet_list(X->button_out,0,3,ats);
}
SETFLOAT(&ats[0],x/5103.0);
SETFLOAT(&ats[1],y/3711.0);
SETFLOAT(&ats[2],z/256.0);
outlet_list(X->axis_out,0,3,ats);
}
/* Format of 7 bytes data packet for Wacom Tablets
Byte 1
bit 7 Sync bit always 1
bit 6 Pointing device detected
bit 5 Cursor = 0 / Stylus = 1
bit 4 Reserved
bit 3 1 if a button on the pointing device has been pressed
bit 2 Reserved
bit 1 X15
bit 0 X14
Byte 2
bit 7 Always 0
bits 6-0 = X13 - X7
Byte 3
bit 7 Always 0
bits 6-0 = X6 - X0
Byte 4
bit 7 Always 0
bit 6 B3
bit 5 B2
bit 4 B1
bit 3 B0
bit 2 P0
bit 1 Y15
bit 0 Y14
Byte 5
bit 7 Always 0
bits 6-0 = Y13 - Y7
Byte 6
bit 7 Always 0
bits 6-0 = Y6 - Y0
Byte 7
bit 7 Always 0
bit 6 Sign of pressure data
bit 5 P6
bit 4 P5
bit 3 P4
bit 2 P3
bit 1 P2
bit 0 P1
byte 8 and 9 are optional and present only
in tilt mode.
Byte 8
bit 7 Always 0
bit 6 Sign of tilt X
bit 5 Xt6
bit 4 Xt5
bit 3 Xt4
bit 2 Xt3
bit 1 Xt2
bit 0 Xt1
Byte 9
bit 7 Always 0
bit 6 Sign of tilt Y
bit 5 Yt6
bit 4 Yt5
bit 3 Yt4
bit 2 Yt3
bit 1 Yt2
bit 0 Yt1
*/
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