From 522bde7b7e7d70fc86a5dac2042b7b20e05c197b Mon Sep 17 00:00:00 2001
From: Astatin <git@astatin.live>
Date: Thu, 29 Aug 2024 16:14:35 +0900
Subject: Fix issues related to VBlank wait in sameboy + Add stairs
 interactions

---
 utils.gbasm | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'utils.gbasm')

diff --git a/utils.gbasm b/utils.gbasm
index babf7da..0f80ce8 100644
--- a/utils.gbasm
+++ b/utils.gbasm
@@ -95,3 +95,17 @@ MUL: ; B x C => EA
 		ADD C
 	MUL.bit0:
 	RET
+
+VBlank_Wait:
+	PUSH AF
+	LD A, $reg_lcd_controller
+	BIT 7, A
+	JR Z, =VBlank_Wait.End
+	VBlank_Wait.loop:
+	LD A, $reg_lcd_status
+	AND $03
+	CP $01
+	JR NZ, =VBlank_Wait.loop
+	VBlank_Wait.End:
+	POP AF
+	RET
-- 
cgit v1.2.3-70-g09d2