hello.c


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/* http://www.loirak.com/gameboy/gbatutor.php
 * hello.c - Gameboy Advance Tutorial - Loirak Development
 */
#define RGB16(r,g,b)  ((r)+(g<<5)+(b<<10))

void start(void)
{
	char x,y;
	unsigned short* Screen = (unsigned short*)0x6000000;
	*(unsigned long*)0x4000000 = 0x403; // mode3, bg2 on

	// clear screen, and draw a blue back ground
	for(x = 0; x<240;x++)   //loop through all x
	{
		for(y = 0; y<160; y++)  //loop through all y
		{
			Screen[x+y*240] = RGB16(0,0,31);
		}
	}

	// draw a white HI on the background
	for(x = 20; x<=60; x+=15)
		for(y = 30; y<50; y++)
			Screen[x+y*240] = RGB16(31,31,31);
	for (x = 20; x < 35; x++)
		Screen[x+40*240] = RGB16(31,31,31);

	while(1){}	//loop forever
}