.globl _ubox_select_ctl

GTTRIG = 0x00d8

_ubox_select_ctl::
	ld b, #3
loop:
	ld a, b
	dec a
	push bc
	call GTTRIG
	pop bc
	or a
	jr nz, trigger
	djnz loop

	; 2nd button

	ld b, #4
	ld a, b
	push bc
	call GTTRIG
	pop bc
	or a
	jr nz, trigger_b

	dec b
	ld a, b
	push bc
	call GTTRIG
	pop bc
	or a
	jr nz, trigger_b

	ld l, #0xff
	ret
trigger_b:
	dec b
trigger:
	dec b
	ld l, b
	ret