need help, trying to get started

[kennypu]

hello
I was trying to get started in making ds games and apps, and I have successfully installed the toolchains and compiled some example files, and now I am trying to start on a simple project.
To keep things simple, for some reason I cannot compile my code becaues I get an error saying:

Code: Select all

error: 'backgroundBitmap' was not declared in this scope
error: 'backgroundbitmapLen' was not declared in this scope

those constants were created in a separate header file for the sprites created by grit. For some reason it keeps tripping out on that, and I am not sure why. I would assume that those constants are global, so I would think scope shouldn't matter, but I am no pro. Any help? If you want the whole code, it is:

Code: Select all

/****************************************
* 	NDS Sprite Tutorial    	
* 	Author: opearn		
****************************************/
 
/*includes*/
 
//include
 
#include <nds.h> 
#include "background.h"
void initVideo()
{
	vramSetMainBanks(VRAM_A_MAIN_BG_0x06000000,
                     VRAM_B_MAIN_BG_0x06020000,
                     VRAM_C_SUB_BG_0x06200000,
                     VRAM_D_LCD);

    /*  Set the video mode on the main screen. */
    videoSetMode(MODE_5_2D | // Set the graphics mode to Mode 5
                 DISPLAY_BG2_ACTIVE | // Enable BG2 for display
                 DISPLAY_BG3_ACTIVE); //Enable BG3 for display

    /*  Set the video mode on the sub screen. */
    videoSetModeSub(MODE_5_2D | // Set the graphics mode to Mode 5
                    DISPLAY_BG3_ACTIVE); // Enable BG3 for display
}
void initBackgrounds() {
    /*  Set up affine background 3 on main as a 16-bit color background. */
    REG_BG3CNT = BG_BMP16_256x256 |
                 BG_BMP_BASE(0) | // The starting place in memory
                 BG_PRIORITY(3); // A low priority

    /*  Set the affine transformation matrix for the main screen background 3
     *  to be the identity matrix.
     */
    REG_BG3PA = 1 << 8;
    REG_BG3PB = 0;
    REG_BG3PC = 0;
    REG_BG3PD = 1 << 8;

    /*  Place main screen background 3 at the origin (upper left of the
     *  screen).
     */
    REG_BG3X = 0;
    REG_BG3Y = 0;
}

/* Select a low priority DMA channel to perform our background
 * copying. */
static const int DMA_CHANNEL = 3;

void displayBG() {
    dmaCopyHalfWords(DMA_CHANNEL,
                     backgroundBitmap, /* This variable is generated for us by
                                       * grit. */
                     (uint16 *)BG_BMP_RAM(0), /* Our address for main
                                               * background 3 */
                     backgroundBitmapLen); /* This length (in bytes) is generated
                                           * from grit. */
}

int main() {
powerOn(POWER_ALL_2D);

lcdMainOnBottom();
initVideo();
initBackgrounds();

/*display the backgrounds. */
displayBG();
return 0;
}
 

I am following Patater's tutorial. Thanks

[vuurrobin]

it could be that grit is converting the image into a tilemap instead of a bitmap. check your grit file to see in what you're converting it, or else check the background.h file. it should be in the build folder.