CCTV(PTZ) 업체에 있다 보니 리눅스에서도 조이스틱을 이용해서
컨트롤러를 대체할수 있을까 라는 생각에 조이스틱 관련 API를 찾아보는데
의외로 단순한 구조 같은 느낌..
요즘에는 USB로도 많이 쓰니 USB목록에서 장치명을 찾아서 열거하는 것도 필요할 듯 하고
아무튼 중요한건 js_event 구조체 이녀석인듯.
| int fd = open ("/dev/js0", O_RDONLY);
struct js_event e;
read (fd, &e, sizeof(struct js_event));
struct js_event {
__u32 time; /* event timestamp in milliseconds */
__s16 value; /* value */
__u8 type; /* event type */
__u8 number; /* axis/button number */
};
|
[링크 :
http://www.mjmwired.net/kernel/Documentation/input/joystick-api.txt] 3.2 kernel
[링크 :
http://archives.seul.org/linuxgames/Aug-1999/msg00107.html] 2.2 kernel
----
curse.h가 없다고 에러날 경우는 아래와 같이 설치해주고
| $ sudo apt-get install libncurses5-dev |
소스는 이런식으로 수정하고 컴파일을 하면된다.
| #define JOY_DEV "/dev/input/js0" |
#include "pthread.h"
#include "sys/timeb.h"
#include "curses.h"
#include "fcntl.h"
#include "linux/joystick.h"
#define NUM_THREADS 3
#define JOY_DEV "/dev/input/js0"
#define HZ 12
const char FILENAME[] = "./joystickLog.out";
char axisDesc[15][5] = {"X", "Y", "Z", "R", "A", "B", "C", "D", "E", "F", "G", "H", "I" };
char numAxis[20], numButtons[20], value[20][20], timeSec[20], timeMilli[20];
int num_of_axis;
void write_to_log(){
sleep(1);
int cnt;
FILE * daFile;
daFile = fopen(FILENAME, "w+");
// WRITE A HEADER ON THE OUPUT FILE
fprintf(daFile, "#,");
for(cnt = 0; cnt < num_of_axis; cnt++)
if(cnt < num_of_axis -1) fprintf(daFile, "%s,", axisDesc[cnt]);
else fprintf(daFile, "%s", axisDesc[cnt]);
fprintf(daFile, "\r\n");
while(1){
fprintf(daFile, "%s.%s, ", timeSec, timeMilli);
for(cnt = 0; cnt < num_of_axis; cnt++){
if(cnt < num_of_axis -1) fprintf(daFile, "%s, ", value[cnt]);
else fprintf(daFile, "%s ", value[cnt]);
}
fprintf(daFile, "\r\n");
usleep(83333);
}
fprintf(daFile, "%s.%s Len = %d ", timeSec, timeMilli,strlen(timeMilli));
fprintf(daFile, "\r\n");
fflush(daFile);
}
void write_to_screen(){
struct timeb seconds;
int cnt, joy_fd, *axis=NULL, num_of_buttons=0, x;
char *button=NULL, name_of_joystick[80];
struct js_event js;
time_t theTime;
wmove(stdscr, 8, 0);
addstr("Type \"q\" to quit.\n");
if( ( joy_fd = open( JOY_DEV , O_RDONLY)) == -1 ){
wmove(stdscr, 3,0);
addstr( "Couldn't open joystick " );
addstr( JOY_DEV );
wmove(stdscr, 10,0);
while(1)usleep(16666);
}
ioctl( joy_fd, JSIOCGAXES, &num_of_axis ); // GET THE NUMBER OF AXIS ON JS
ioctl( joy_fd, JSIOCGBUTTONS, &num_of_buttons ); // GET THE NUMBER OF BUTTONS ON THE JS
ioctl( joy_fd, JSIOCGNAME(80), &name_of_joystick ); // GET THE NAME OF THE JS
axis = (int *) calloc( num_of_axis, sizeof( int ) );
button = (char *) calloc( num_of_buttons, sizeof( char ) );
sprintf(numAxis, "%d", num_of_axis);
sprintf(numButtons, "%d", num_of_buttons);
wmove(stdscr, 0,0);
addstr("Joystick detected: ");
wmove(stdscr, 0, 19);
addstr(name_of_joystick);
wmove(stdscr, 1, 0);
addstr("Number of axis :");
wmove(stdscr, 1, 19);
addstr(numAxis);
wmove(stdscr, 2, 0);
addstr("Number of buttons:");
wmove (stdscr, 2, 19);
addstr(numButtons);
// CHANGE THE STATUS FLAG OF THE FILE DESCRIPTOR TO NON-BLOCKING MODE
fcntl( joy_fd, F_SETFL, O_NONBLOCK );
while( 1 ){
usleep(16666);
// READ THE JOYSTICK STATE, IT WILL BE RETURNED IN THE JS_EVENT STRUCT
read(joy_fd, &js, sizeof(struct js_event));
// GET THE NUMBER OF SECONDS SINCE EPOCH
ftime(&seconds);
theTime = time(NULL);
sprintf(timeSec, "%d", seconds.time);
sprintf(timeMilli, "%d", seconds.millitm);
// CHECK THE EVENT
switch (js.type & ~JS_EVENT_INIT){
case JS_EVENT_AXIS:
axis [ js.number ] = js.value;
break;
case JS_EVENT_BUTTON:
button [ js.number ] = js.value;
break;
}
// ADD LEADING 0'S TO THE MILLISECOND STRING (IF NECESSARY)
char temp[10] = "";
while(strlen(temp) < (3 - strlen(timeMilli)))
strcat(temp, "0");
strcat(temp,timeMilli);
strcpy(timeMilli, temp);
// PRINT THE RESULTS
wmove(stdscr, 4, 0);
for(cnt = 0; cnt < num_of_axis; cnt++)
addstr(" ");
for(cnt = 0; cnt < num_of_axis && cnt < 13; cnt++){
sprintf(value[cnt], "%d", axis[cnt]);
wmove(stdscr, 4, cnt * 10);
addstr(axisDesc[cnt]);
addstr(": ");
wmove(stdscr, 4, (cnt * 10) + 2);
addstr(value[cnt]);
}
wmove(stdscr, 6, 0);
addstr(timeSec);
wmove(stdscr, 6,10);
addstr(".");
wmove(stdscr, 6, 11);
addstr(timeMilli);
wmove(stdscr, 6, 15);
addstr("=");
wmove(stdscr, 6, 17);
addstr(ctime(&theTime));
wmove(stdscr, 10, 0);
refresh();
}
}
void *ThreadProcs(void *threadid){
int thread_id = (int)threadid;
if(thread_id == 0){
write_to_screen();
}
if(thread_id == 1){
// THIS THREAD WILL MAKE THE PROGRAM EXIT
int ch;
nodelay(stdscr, TRUE); // SETUP NON BLOCKING INPUT
while(1) {
if ((ch = getch()) == ERR) usleep(16666); // USER HASN'T RESPONDED
else if( ch == 'q'){
endwin();
exit(0); // QUIT ALL THREADS
}
}
}
if(thread_id == 2){
write_to_log();
}
}
int main(int argc, char *argv[]){
initscr(); // INIT THE SCREEN FOR CURSES
pthread_t threads[NUM_THREADS];
int rc, t;
for(t = 0; t < NUM_THREADS; t++){ // MAKE 2 NEW THREADS
rc = pthread_create(&threads[t], NULL, ThreadProcs, (void *)t);
if (rc){
printf("ERROR; return code from pthread_create() is %d\n", rc);
exit(-1);pthread_exit(NULL);
}
}
for(t = 0; t < NUM_THREADS; t++)
pthread_join(threads[t], NULL); // WAIT FOR THREADS TO EXIT OR IT WILL RACE TO HERE.
endwin();
return 0;
}
[링크 :
http://www.linuxquestions.org/questions/programming-9/joystick-347292/]
+ [링크 :
http://sukwoo.blogspot.com/2008/07/ubuntu-804-ncurses.html]
---
[링크 :
http://msdn.microsoft.com/en-us/library/windows/desktop/dd743596(v=vs.85).aspx] << 윈도우용
