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/*
(c) 2005:forum::für::umläute:2000
write to the parallel port
extended to write to any port (if we do have permissions)
*/
#define BASE0 0x3bc
#define BASE1 0x378
#define BASE2 0x278
#define MODE_IOPERM 1
#define MODE_IOPL 0
#include "zexy.h"
#include <sys/io.h>
#include <stdlib.h>
/* ----------------------- lp --------------------- */
static int count_iopl = 0;
static t_class *lp_class;
typedef struct _lp
{
t_object x_obj;
unsigned long port;
int mode; // MODE_IOPERM, MODE_IOPL
} t_lp;
static void lp_float(t_lp *x, t_floatarg f)
{
if (x->port) {
unsigned char b = f;
outb(b, x->port);
}
}
static void *lp_new(t_symbol *s, int argc, t_atom *argv)
{
t_lp *x = (t_lp *)pd_new(lp_class);
x->port = 0;
if ((argc==0)||(argv->a_type==A_FLOAT)) {
/* FLOAT specifies a parallel port */
switch ((int)((argc)?atom_getfloat(argv):0)) {
case 0:
x->port = BASE0;
break;
case 1:
x->port = BASE1;
break;
case 2:
x->port = BASE2;
break;
default:
error("lp : only lp0, lp1 and lp2 are accessible");
x->port = 0;
return (x);
}
} else {
/* SYMBOL might be a file or a hex port-number;
we ignore the file (device) case by now;
LATER think about this
*/
x->port=strtol(atom_getsymbol(argv)->s_name, 0, 16);
}
if (!x->port || x->port>65535){
post("lp : bad port %x", x->port);
x->port = 0;
return (x);
}
if (x->port && x->port < 0x400){
if (ioperm(x->port, 8, 1)) {
error("lp : couldn't get write permissions");
x->port = 0;
return (x);
}
x->mode = MODE_IOPERM;
} else {
if (iopl(3)){
error("lp : couldn't get write permissions");
x->port = 0;
return (x);
}
x->mode=MODE_IOPL;
count_iopl++;
post("iopl.............................%d", count_iopl);
}
post("connected to port %x in mode '%s'", x->port, (x->mode==MODE_IOPL)?"iopl":"ioperm");
if (x->mode==MODE_IOPL)post("warning: this might seriously damage your pc...");
return (x);
}
static void lp_free(t_lp *x)
{
if (x->port) {
if (x->mode==MODE_IOPERM && ioperm(x->port, 8, 0)) error("lp: couldn't clean up device");
else if (x->mode==MODE_IOPL && (!--count_iopl) && iopl(0))
error("lp: couldn't clean up device");
}
}
static void helper(t_lp *x)
{
post("\n%c lp :: direct access to the parallel port", HEARTSYMBOL);
post("<byte>\t: write byte to the parallel-port");
post("\ncreation:\t\"lp [<port>]\": connect to parallel port <port> (0..2)");
post("\t\t\"lp <portaddr>\": connect to port @ <portaddr> (hex)");
}
void z_lp_setup(void)
{
lp_class = class_new(gensym("lp"),
(t_newmethod)lp_new, (t_method)lp_free,
sizeof(t_lp), 0, A_GIMME, 0);
class_addfloat(lp_class, (t_method)lp_float);
class_addmethod(lp_class, (t_method)helper, gensym("help"), 0);
class_sethelpsymbol(lp_class, gensym("zexy/lp"));
}
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