devkitPro

Posted: **Tue Jun 07, 2011 3:00 pm**

Hello, I'm trying to extend my knowledge of programming to the nds, but I've hit a snag pretty early on.

I've followed a few tutorials and gotten them to work, but as soon as I try to make anything of my own, the background images consistently show up as garbage. The code I'm using to display my image is very simple:

Code: Select all

#include <nds.h>
#include <stdio.h>

#include "bg.h"

int main(void)
{
	videoSetMode(MODE_5_2D | DISPLAY_BG3_ACTIVE);
        vramSetBankA(VRAM_A_MAIN_BG);

	irqInit();
	irqEnable(IRQ_VBLANK);

	int bg3 = bgInit(3, BgType_Bmp8, BgSize_B8_256x256, 0,0);

	dmaCopy(brickTiles, bgGetGfxPtr(bg3), 256*256);
	dmaCopy(brickPal, BG_PALETTE, 256*2);
        while(1)
	{
		// process logic
		// process graphics
		swiWaitForVBlank();
		// update graphics
	}
	return 0;
}

the bg test image:
http://i.imgur.com/GbsIr.png

the end display:
http://i.imgur.com/fpqAX.png

any help is appreciated.

Posted: **Thu Jun 09, 2011 6:20 pm**

irqInit(); and irqEnable(IRQ_VBLANK); are already called before main starts. calling them yourself will cause errors with libnds. remove those 2 calls and try again.

Posted: **Thu Jun 09, 2011 6:34 pm**

Removing the irq calls doesn't affect it one way or another - thanks for the suggestion, though.

Posted: **Fri Jun 10, 2011 8:21 am**

Beware that the tutorials may be wrong and out of date in more ways than just this.

devkitPro

BG image shows up as garbage

BG image shows up as garbage

Re: BG image shows up as garbage

Re: BG image shows up as garbage

Re: BG image shows up as garbage