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#include <stdio.h>
#include <stdbool.h>
#include "SDL.h"
void joystick_open(int id, SDL_Joystick* joystick) {
joystick=SDL_JoystickOpen(id);
if(joystick) {
fprintf(stderr, "Opened joystick %d\n", id);
fprintf(stderr, "Name: %s\n", SDL_JoystickName(joystick));
fprintf(stderr, "Number of axes: %d\n", SDL_JoystickNumAxes(joystick));
fprintf(stderr, "Number of buttons: %d\n", SDL_JoystickNumButtons(joystick));
fprintf(stderr, "Number of balls: %d\n", SDL_JoystickNumBalls(joystick));
} else {
fprintf(stderr, "Couldn't open joystick %d\n", id);
}
}
void joystick_close(SDL_Joystick* joystick) {
if (SDL_JoystickGetAttached(joystick)) {
SDL_JoystickClose(joystick);
}
}
int main(int argc, char *argv[]) {
//initialize joystick library
if (SDL_InitSubSystem(SDL_INIT_JOYSTICK) < 0) {
fprintf(stderr, "Couldn't initialize SDL joystick: %s\n", SDL_GetError());
exit(1);
}
//id of controlling joystick
int joystick_id = 0;
int throttle = 0;
//pointer to joystick in use
SDL_Joystick* joystick = NULL;
//event loop
SDL_Event e;
bool cont = true;
while (cont) {
while( SDL_WaitEventTimeout(&e, 500)) {
switch( e.type ) {
case SDL_JOYDEVICEADDED:
if (e.jdevice.which == joystick_id) {
fprintf(stderr, "Joystick connected\n");
joystick_open(joystick_id, joystick);
}
break;
case SDL_JOYDEVICEREMOVED:
if (e.jdevice.which == joystick_id) {
fprintf(stderr, "Joystick disconnected\n");
joystick_close(joystick);
}
break;
case SDL_JOYAXISMOTION:
fprintf(stderr, "axis event\n");
fprintf(stderr, "%d\n", e.jaxis.value);
break;
case SDL_JOYHATMOTION:
fprintf(stderr, "hat event\n");
break;
case SDL_JOYBUTTONDOWN:
switch (e.jbutton.button) {
case 0:
throttle = 12;
break;
case 4:
throttle -= 1;
break;
case 5:
throttle += 1;
break;
case 6:
throttle -= 25;
break;
case 7:
throttle += 25;
break;
default:
break;
}
fprintf(stderr, "button down\n");
break;
case SDL_JOYBUTTONUP:
fprintf(stderr, "button up\n");
break;
case SDL_QUIT:
cont = false;
break;
default:
fprintf(stderr,"Unsupported event type: %d\n", e.type);
break;
}
if (throttle < 0) {
throttle = 0;
}
if (throttle > 255) {
throttle = 255;
}
unsigned char tc = (unsigned char) throttle;
fprintf(stderr, "%u\n", tc);
printf("%u\n", tc);
fflush(stdout);
}
unsigned char tc = (unsigned char) throttle;
//fwrite(&tc, 1, 1, stdout);
//fflush(stdout);
printf("%u\n", tc);
fflush(stdout);
//print_control_data(&c);
//printf("--\n");
}
return 0;
}
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