From 4778276f33c59bb0bc56cb381d4fe1dc8da1f9b8 Mon Sep 17 00:00:00 2001
From: yenatch <yenatch@gmail.com>
Date: Sun, 8 Sep 2013 23:53:04 -0400
Subject: split serial handshake into common/handshake.asm

---
 common/handshake.asm | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 common/handshake.asm

(limited to 'common')

diff --git a/common/handshake.asm b/common/handshake.asm
new file mode 100644
index 000000000..8ed1473e4
--- /dev/null
+++ b/common/handshake.asm
@@ -0,0 +1,38 @@
+AskSerial: ; 2063
+; send out a handshake while serial int is off
+	ld a, [$c2d4]
+	bit 0, a
+	ret z
+	
+	ld a, [$c2d5]
+	and a
+	ret nz
+	
+; once every 6 frames
+	ld hl, $ca8a
+	inc [hl]
+	ld a, [hl]
+	cp 6
+	ret c
+	
+	xor a
+	ld [hl], a
+	
+	ld a, $c
+	ld [$c2d5], a
+	
+; handshake
+	ld a, $88
+	ld [rSB], a
+	
+; switch to internal clock
+	ld a, %00000001
+	ld [rSC], a
+	
+; start transfer
+	ld a, %10000001
+	ld [rSC], a
+	
+	ret
+; 208a
+
-- 
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