Category : C Source Code
Archive : JOYSTICK.ZIP
Filename : CAL_STIC.C
Output of file : CAL_STIC.C contained in archive : JOYSTICK.ZIP
/* CAL_STICK.C */
/* written by Raymond F. Genovese */
/* Turbo-C (V1.5) */
/* unsigned character default */
/***********************************/
/* here are some routines to calibrate and read the joystick on the PC.
after calibration, joystick() returns a value corresponding to the
direction of the joystick....
1
8 2
7 0 3
6 4
5
*/
#include
#include
/* global variables to hold the calibrate values for when the stick is moved */
char maxx,maxy,minx,miny;
/* global variables to hold the state of the two fire buttons */
char button1=0,button2=0;
union REGS r;
void calibrate_joy(),fire();
char joystick(),fire_any();
int long_wait_fire();
main()
{
char ch=0;
calibrate_joy();
printf("\n OK move joystick or press a fire button to end \n");
while((!button1)&&(!button2)){
fire();
ch=joystick();
if(ch)
printf("%d",ch);
}
exit(1);
}
void calibrate_joy()
{
char count_x,count_y,joy;
char x_center,y_center,x_min,y_min,x_max,y_max;
printf("CENTER joystick and press a key ");
(void)getch();
count_x=0;
count_y=0;
outportb(0x201,0);
while((joy=inportb(0x201))&3){
if(joy&1)
count_x++;
if(joy&2)
count_y++;
}
printf("OK-%d %d \n",count_x,count_y);
x_center=count_x;
y_center=count_y;
printf("Position joystick to UPPER RIGHT and press a key ");
(void)getch();
count_x=0;
count_y=0;
outportb(0x201,0);
while((joy=inportb(0x201))&3){
if(joy&1)
count_x++;
if(joy&2)
count_y++;
}
printf("OK-%d %d \n",count_x,count_y);
x_max=count_x;
y_min=count_y;
printf("Position joystick to LOWER LEFT and press a key ");
(void)getch();
count_x=0;
count_y=0;
outportb(0x201,0);
while((joy=inportb(0x201))&3){
if(joy&1)
count_x++;
if(joy&2)
count_y++;
}
printf("OK-%d %d \n",count_x,count_y);
x_min=count_x;
y_max=count_y;
/* this is where the globals get set */
maxx=x_center+((x_max-x_center)/2);
minx=x_center-((x_center-x_min)/2);
maxy=y_center+((y_max-y_center)/2);
miny=y_center-((y_center-y_min)/2);
}
char joystick()
{
/* returns 0-8 for the joystick position
based on maxx and maxy from calibration */
char joy;
unsigned count_x,count_y;
count_x=0; count_y=0;
outportb(0x201,0);
while((joy=inportb(0x201))&3){
if(joy&1)
count_x++;
if(joy&2)
count_y++;
}
if(count_x>=maxx){
if(count_y>=maxy)
joy=4;
else if(count_y<=miny)
joy=2;
else
joy=3;
return(joy);
}
if(count_x<=minx){
if(count_y>=maxy)
joy=6;
else if (count_y<=miny)
joy=8;
else
joy=7;
return(joy);
}
if(count_y<=miny)
return((joy=1));
else if(count_y>=maxy)
return((joy=5));
else
return((joy=0));
}
void fire()
{
/* set the global vars button1 and button2 to 1 if pressed */
char button;
button=inportb(0x201);
if(button&16)
button1=0;
else
button1=1;
if(button&32)
button2=0;
else
button2=1;
}
/* these next to routines are not in the demo but you may find them interesting */
char fire_any()
{
/* returns 1 if either button is pressed */
char button;
button=inportb(0x201);
if((button&16)&&(button&32))
return(0);
else
return(1);
}
int long_wait_fire( unsigned n)
{
/* waits for n centiseconds or until any button is pressed */
/* returns 1 if timeout & 0 if button is pressed */
struct time tod;
unsigned long start_time,timeout_time,current_time;
char button;
start_time=(360000L*tod.ti_hour+6000L*tod.ti_min+
100*tod.ti_sec+tod.ti_hund);
timeout_time=start_time+n;
for( ; ; ){
gettime(&tod);
current_time=(360000L*tod.ti_hour+6000L*tod.ti_min+
100*tod.ti_sec+tod.ti_hund);
if(current_time
if(current_time>=timeout_time)
return(1);
button=inportb(0x201);
if((button&16)&&(button&32))
return(0);
}
}
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