/* the main function */
int main( ) {
/* we set the mode to mode 0 with bg0 on */
*display_control = MODE0 | BG0_ENABLE;
/* setup the background 0 */
setup_background();
/* set initial scroll to 0 */
int xscroll = 0;
int yscroll = 0;
/* loop forever */
while (1) {
/* scroll with the arrow keys */
if (button_pressed(BUTTON_DOWN)) {
yscroll++;
}
if (button_pressed(BUTTON_UP)) {
yscroll--;
}
if (button_pressed(BUTTON_RIGHT)) {
xscroll++;
}
if (button_pressed(BUTTON_LEFT)) {
xscroll--;
}
/* wait for vblank before scrolling */
wait_vblank();
*bg0_x_scroll = xscroll;
*bg0_y_scroll = yscroll;
/* delay some */
delay(200);
}
}
/* wait until start of vertical blank */
wait_sync()
{
wait_novblank();
wait_vblank();
}
