Gameboy Development Forum

I doubt a data array will take less space in asm than in C unless there's a big bug on GBDK (which is posible)

I'll check this thanks.

Yes, they're constant. I also tried putting them in the main C file rather than as imports but nothing happened. In a different thread someone else said that putting their arrays as assembly rather than C fixed the problem, that's why I asked. So could someone please actually answer the question.

Last edited by jobalisk (2017-06-05 15:53:25)

ok, that's for that. Before I try it out, can you link me how to do bank switching as well, I'm kinda a nub here when it comes to C for gameboy

Thanks, ill check these out sometime later in the week when I get back to my PC.

Probably you didn't declare your variables and functions properly. If you want to access a variable or function that is declared in another C file that goes to a different bank, you have to declare it as "extern" in the file that uses the variable or function.

For example, if you declare a UINT8 variable that is called MyNumber in advojoboB.c (which goes to bank 2) and you want to use that variable in advojobo.c (which goes to bank 0), it must look like this:

Declare the variable in advojoboB.c:

UINT8 MyNumber;

And include this declaration in advojobo.c:

extern UINT8 MyNumber;

Also, as far as I remember, you have to include gb.h and stdio.h separately in all banks.

...So I finally get it all ready to compile as separate files for multiple banks then when I hit compile I get the same old overflow message...

Assuming I have two files advojobo.c and advojoboB.c and that they are written correctly, what would be the way to compile them so that advojoboB.c is in a separate memory bank, I've tried reading through the documentation above but I don't seem to be getting anywhere.

Last edited by jobalisk (2017-06-11 15:35:42)

rats, that still generates the overflow error. I must have some code wrong somewhere or something.

well I haven't referenced the second file in the first. I tried making the images smaller a while back which allowed me to use 2 rather than one, but the smaller images lack impact. Besides they are only 128*128 to begin with. I'm confused because I can fit 1 128*128 image as standard in the ROM bank 0 so I'd assume I can fit 1 in the second ROM bank. I'll have a poke around switching things out and see what happens.

UPDATE

Ok, so I tried commenting out the first image and the custom alphabet I had made then just had story 2 loading from the second ROM. However this still caused an overload error even though the image will load fine if I include it in the main file... I'm a bit confused here.

I'll post the code below

B:


#include <stdio.h>
#include <gb/gb.h>
#include "story2.dat"
#include "alphabet.c"
//part 2 of the intro story as a seperate file
void storyPart2(void){
   

    set_bkg_data(0,255, story2_tile_data);
    set_bkg_tiles(0,0,16,16,story2_map_data);

   
}

void alphabetset(void){
    set_bkg_data(0,255, alphabeto);
}



Here's the relevant part of A:


//Cold Autumn Fire
//Job Dyer 27/05/2017

#include <stdio.h>
#include <gb/gb.h>
#include "jobalisk.c"
#include "ground.c"
#include "advojobomap.c"
#include "blank1.c"

#include "story1.dat"


unsigned int gameLoop = 1; //game loop, duh
unsigned int walkAlt = 0; //are we using the left or right sprite to walk with ect.
unsigned int direction1 = 0; //direction the player is facing. 0 is DOWN, 1 is LEFT, 2 is RIGHT, 3 is UP
unsigned int sp1x = 75; //X coordinates for Player 1's first sprite
unsigned int sp1y = 80; //Y coordinates for Player 1's first sprite
unsigned int sp2x = 83; //X coordinates for Player 1's first sprite
unsigned int sp2y = 80; //Y coordinates for Player 1's first sprite

unsigned int sp1xbk = 75; //X coordinates for Player 1's first sprite backup
unsigned int sp1ybk = 80; //Y coordinates for Player 1's first sprite backup
unsigned int sp2xbk = 83; //X coordinates for Player 1's first sprite backup
unsigned int sp2ybk = 80; //Y coordinates for Player 1's first sprite backup

unsigned int bkgndX = 0; //X coordinate for the Background (for scrolling ect)

unsigned int playerSpeed = 4; //players walking speed
unsigned int spriteDelay = 100; //delay time between switching sprites
unsigned int majorActionDelay = 200; //delay for things like jumping, punching, kickingm ect
unsigned int playerHealth = 6; //health the player has
unsigned int playerPunchD = 1; //how much dammage a punch does
unsigned int playerKickD = 2; //how much dammage a kick does
unsigned int PlayerKO = 0; //is the player KOed?
unsigned int isJumping = 0; //int for if the player is jumping
unsigned int isPunching = 0; //int for if the player is punching (so it cant just stay punched)
unsigned int isKicking = 0; //int for if the player is kicking
unsigned int isBlocking = 0; //int for if the player is in block mode
unsigned int isCrouching = 0; //int for if the player is in crouch mode.
unsigned int jumpTester = 0; //seeing how high we have jumped so far
unsigned int maxJumpHight = 20; //maximum hight for the jump
unsigned int groundLevel = 75; //default position taken from begining of the jump.
unsigned int jumpSpeed = 2; //speed at which the player jumps.


void storyPart2(); //preload the story loader


void ResetGame() //resets all variables
{
    gameLoop = 1;
    walkAlt = 0;
    direction1 = 0;
    sp1x = 75;
    sp1y = 80;
    sp2x = 83;
    sp2y = 80;
    sp1xbk = 75;
    sp1ybk = 80;
    sp2xbk = 83;
    sp2ybk = 80;
    playerSpeed = 4;
    spriteDelay = 100;
    majorActionDelay = 200;
    playerHealth = 6;
    playerPunchD = 1;
    playerKickD = 2;
    PlayerKO = 0;
    groundLevel = 75;
    isJumping = 0;
    isPunching = 0;
    isKicking = 0;
    isBlocking = 0;
    isCrouching = 0;
    jumpTester = 0;
    bkgndX = 0;
}

void clsrn()
{//screen clearer
    printf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
}
void gameOver()
{
    HIDE_SPRITES;
    set_bkg_data(0,0, NULL);
    set_bkg_tiles(0,0,32,32,NULL);
    clsrn();
    printf("\n\n\n\n\n\n     GAME OVER!\n\n"); //run the game over message
    waitpad(J_A);
    ResetGame();

}
void gameWon()
{
    HIDE_SPRITES;
    set_bkg_data(0,1, NULL);
    set_bkg_tiles(0,0,32,32,NULL);
    clsrn();
    printf("\n\n\n\n\n\n     YOU WIN!\n\n\n\n\n");
    waitpad(J_A);
    ResetGame();
}


int main()
{
    printf(" ");
    printf("\n\n\n\nEternityWare Studios"); //intro
    delay(1000);
    printf("\n\n\n\n");
    printf("     Presents:");
    delay(2000);
    resetter1: //restart from here
    gameLoop = 1;
    walkAlt = 0;
    direction1 = 0;
    clsrn();
    SWITCH_ROM_MBC1(2);    // switch to ROM bank 2
    alphabetset();        // Routine to load the alphabet section there
    SWITCH_ROM_MBC1(1);    // switch to ROM bank 1
    printf("\n\n\n\n\n\n     Mid Autumn\n        Wind\n\n\n\n\n\n");
    delay(2000);
    printf("\n\n\n\n\n\n    Press START"); //wait for start
    waitpad(J_START);
    clsrn();

   
    SPRITES_8x16; //set sprites to load as max (8*16)
   
    //start intro movie
   
    HIDE_BKG; //scene 1
    disable_interrupts();
    set_bkg_data(0,255, story1_tile_data);
    set_bkg_tiles(0,0,16,16,story1_map_data);
    enable_interrupts();
    SHOW_BKG;
    delay(2000);
   
   
    HIDE_BKG; //scene 2 (loading from second file
    disable_interrupts();
    SWITCH_ROM_MBC1(2);    // switch to ROM bank 2
    storyPart2();        // Routine to load the story section there
    enable_interrupts();
    SHOW_BKG;   
    delay(2000);
   
   
    HIDE_BKG;
    disable_interrupts();
    SWITCH_ROM_MBC1(0);    // switch to ROM bank 0
    set_bkg_data(0,1, NULL);
    set_bkg_tiles(0,0,32,32,NULL);
    enable_interrupts();
    SHOW_BKG;
    delay(2000);

   
    set_bkg_data(0,24, groundTiles);

Last edited by jobalisk (2017-06-13 04:20:14)

oh sorry, I meant 128 by 128 pixels, not tiles, so its not that large. I'll give it a shot thanks.

The second story file and the alphabet file wont fit in the same ROM bank, being 12 and 11 kb each. Though I don't think that's what's causing the problem as I have compiled it without including the alphabet file and it still errors.

Doing what you suggested and then compiling still generates the same error.

OK, here's something interesting. commenting out everything but import gb and import stdio in the second file still causes an overload. In other words the issue is with the second file itself rather than what it contains.

looking at the .o file somehow the standard .o file for the basic game with nothing but the story1 file is 161kb somehow. the main C file advojobo.c is somehow 16kb on its own with the map, sprites and other files coming to something like 15kb together. in other words, everything seems far larger than is logical. I'm starting to wonder if the problem is actually my text editor.

Last edited by jobalisk (2017-06-13 15:27:54)

Yes, that would be interesting.

On the basis of what you told about your code/data, it isn't really plausible that the size should exceed one ROM bank.

Okay... To be honest, I'm not sure whether we'll solve that.

But what's the precise error message you see? The "ERROR: address overflow" message you mentioned in post #1 or the "implicit declaration" and "undefined identifier" stuff you showed us in post #9? Or both?

Yes right. It means that the linker tried to write code to an addess beyond $8000 which is not allowed since the space available for ROM data only reaches from $0000 to $7FFF. Normally, the reason is that your code is too large and doesn't fit. But based on the information you provided, it shouldn't exceed the limit.

It's always possile that there's a bug in GBDK (there are plenty). There may well be another explanation, but I don't have it...