Basic setup for C-based Gameboy rom with splash screen.

Makefile

GBDK = /opt/gbdk
CC  = ${GBDK}/bin/lcc -Wa-l -Wl-m -Wl-j
RGB = /opt/rgbds/rgbfix

BINS	= mygame.gb

all:	$(BINS)

%.o:	%.c
	$(CC) -c -o $@ $<

%.s:	%.c
	$(CC) -S -o $@ $<

%.o:	%.s
	$(CC) -c -o $@ $<

%.gb:	%.o
	$(CC) -o $@ $<

%.gbc:	%.o
	$(CC) -o $@ $< && ${RGB} -vcs -l 0x33 -p 0 $@

clean:
	rm -f *.o *.lst *.map *.gb *.gbc *~ *.rel *.cdb *.ihx *.lnk *.sym *.asm

mygame.c

#include <gb/gb.h>
#include <stdio.h>

#include "logo_tile.c"
#include "logo_map.c"

void main() {
    // load logo
    set_bkg_data(0,255, tiledata);
    VBK_REG = 1;
    VBK_REG = 0;
    set_bkg_tiles(0,0,20,18, tilemap);
    SHOW_BKG;
    DISPLAY_ON;

    waitpad(J_START);

    printf(" \n\n\n\n\n\n\n\nYour game goes here.\n");
    waitpad(J_START);
}