Fibonacci Sequence Source Code Help

[sahil927]

Ok I just have finished my Fibonacci sequence program, however I am trying to learn more about the meens of input for the psp.(I am ridiculously new to this).
Without the if statement:

if(pad.Buttons & PSP_CTRL_CROSS) {
printf("%3d %6d\n", i, fib[i]);
}

The Program works fine. But with it it does not work...
Here is my source code, can anyone help me?

#include <pspkernel.h>
#include <pspdebug.h>
#include <pspctrl.h>
PSP_MODULE_INFO("Hello World", 0, 1, 1);
#define printf pspDebugScreenPrintf
SceCtrlData pad;

int exit_callback(int arg1, int arg2, void *common) {
sceKernelExitGame();
return 0;
}


int CallbackThread(SceSize args, void *argp) {
int cbid;

cbid = sceKernelCreateCallback(" Exit Callback", exit_callback, NULL);
sceKernelRegisterExitCall back(cbid);

sceKernelSleepThreadCB();

return 0;
}


int SetupCallbacks(void) {
int thid = 0;

thid = sceKernelCreateThread("up date_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
if(thid >= 0) {
sceKernelStartThread(thid , 0, 0);
}

return thid;
}
int main() {
pspDebugScreenInit();
SetupCallbacks();

int fib[24];
int i;
int loopVar = 1;
fib[0] = 0;
fib[1] = 1;

for(i = 2; i < 24; i++)
fib[i] = fib[i-1] + fib[i-2];
for (i = 0; i < 24; i++)
while(loopVar == 1){
if(pad.Buttons & PSP_CTRL_CROSS) {
printf("%3d %6d\n", i, fib[i]);
}
}
sceKernelSleepThread();
return 0;
}

[weltall]

Originally Posted by sahil927

Ok I just have finished my Fibonacci sequence program, however I am trying to learn more about the meens of input for the psp.(I am ridiculously new to this).
Without the if statement:
The Program works fine. But with it it does not work...
Here is my source code, can anyone help me?

you need to put sceCtrlPeekBufferPositive or sceCtrlReadBufferPositive to fill the pad structure with the pressed buttons

[SG57]

As weltall said, add

sceCtrlReadBuffer(&pad,1);

// or

sceCtrlPeekBuffer(&pad,1);

Right after you start the while(loopVar == 1).

P.S. You don't need to put the == 1 there, or anywhere in a comparitive statement for that matter, as all conditions in a comparitive statement are compared to 'true' (1) default. Hence why:

while(1) { }

works just dandy.

[snmbondagefreak]

This app sounds AWESOME! Are you going to release it soon?!

[Raphael]

Uh... he just did by posting the complete source? Apart from that, it does nothing else then calculate the fibonacci sequence from 0 to 24. Nothing seriously complicated or usefull.

... That's what I call hyping

[sahil927]

Originally Posted by Raphael

Uh... he just did by posting the complete source? Apart from that, it does nothing else then calculate the fibonacci sequence from 0 to 24. Nothing seriously complicated or usefull.

... That's what I call hyping

haha completely true...
i would like to thank everyone for there help!

[Fanjita]

I'd be surprised if it works with just that change. Looks to me like the while loop will never exit, and so you'll just print the first number in the sequence, and nothing more.

Assuming that you're trying to display the next item in the sequence when X is pressed, it would be better to do something like:

for (i = 0; i < 24; i++)
{
  loopVar = 1;
  while(loopVar == 1)
  {
    sceCtrlReadBuffer(&pad,1);
    if(pad.Buttons & PSP_CTRL_CROSS) 
    { 
      printf("%3d %6d\n", i, fib[i]);
      loopVar = 0;

      // the following fragment also helps to avoid lots of numbers with one press, and shows an alternative way to do the loop above.
      while (pad.Buttons & PSP_CTRL_CROSS)
      {
         sceCtrlReadBuffer(&pad, 1);
      }
    }
  }
}

P.S. Indentation fixed for better readability

[PSP-Maniac]

i once made a prog for calculating this but i never released it because it only goes to 3000 or sumthing like that because of the size of integers

[weltall]

yes sure but that was what he requested: how to get controller input :P

[sahil927]

My code currentley:

#include <pspkernel.h>
#include <pspdebug.h>
#include <pspctrl.h>
PSP_MODULE_INFO("Hello World", 0, 1, 1);
#define printf pspDebugScreenPrintf
SceCtrlData pad;

int exit_callback(int arg1, int arg2, void *common) {
sceKernelExitGame();
return 0;
}


int CallbackThread(SceSize args, void *argp) {
int cbid;

cbid = sceKernelCreateCallback(" Exit Callback", exit_callback, NULL);
sceKernelRegisterExitCall back(cbid);

sceKernelSleepThreadCB();

return 0;
}


int SetupCallbacks(void) {
int thid = 0;

thid = sceKernelCreateThread("up date_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
if(thid >= 0) {
sceKernelStartThread(thid , 0, 0);
}

return thid;
}
int main() {
pspDebugScreenInit();
SetupCallbacks();

int fib[24];
int i;
int loopVar = 1;
fib[0] = 0;
fib[1] = 1;

for(i = 2; i < 24; i++)
fib[i] = fib[i-1] + fib[i-2];
for (i = 0; i < 24; i++)
{
loopVar = 1;
while(loopVar == 1)
{
sceCtrlReadBuffer(&pad,1) ;
if(pad.Buttons & PSP_CTRL_CROSS)
{
printf("%3d %6d\n", i, fib[i]);
loopVar = 0;

// the following fragment also helps to avoid lots of numbers with one press, and shows an alternative way to do the loop above.
while (pad.Buttons & PSP_CTRL_CROSS)
{
sceCtrlReadBuffer(&pad, 1);
}
}
}
}
return 0;
}

Can anyone help me understand this error...

make kxploit
psp-gcc -I. -I/usr/local/pspdev/psp/sdk/include -O2 -G0 -Wall -c -o main.o main.c
main.c: In function 'CallbackThread':
main.c:18: error: 'sceKernelRegisterExitCal l' undeclared (first use in this function)
main.c:18: error: (Each undeclared identifier is reported only once
main.c:18: error: for each function it appears in.)
main.c:18: error: syntax error before 'back'
main.c: In function 'main':
main.c:53: warning: implicit declaration of function 'sceCtrlReadBuffer'
main.c:68:2: warning: no newline at end of file
make: *** [main.o] Error 1

[Raphael]

sceKernelRegisterExitCall back(cbid);

Look how there is a space in the function name - that's obviously not correct.

Also make sure you link -lpspctrl in your makefile.

[sahil927]

sceCtrlReadBuffer(&pad,1) ;

It says i have an undefined reference to this...how do i reference it

[Fanjita]

You need to make sure the libs line in your makefile includes "-lctrl".