From e05f077f42b25f539ba14ce7ea6d3b336857a989 Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Tue, 1 Oct 2024 06:26:06 +0200
Subject: [PATCH] video: Now loading tilesets correctly.

vblank_wait: vblank wait was not calling ret
---
 src/main.s  |  1 +
 src/mem.s   | 17 +++++++++++++++++
 src/video.s | 17 +++++++----------
 3 files changed, 25 insertions(+), 10 deletions(-)
 create mode 100644 src/mem.s

diff --git a/src/main.s b/src/main.s
index 0f945be..870aafc 100644
--- a/src/main.s
+++ b/src/main.s
@@ -17,6 +17,7 @@ main:
 
 #include "tiles.inc"
 #include "video.s"
+#include "mem.s"
 
 ; fill bank
 .fill 0, 0x7FFF - $
diff --git a/src/mem.s b/src/mem.s
new file mode 100644
index 0000000..97315cc
--- /dev/null
+++ b/src/mem.s
@@ -0,0 +1,17 @@
+; copies memory from one location to another 
+; inputs:
+;   de: source
+;   hl: destination
+;   bc: length
+memcpy:
+  @loop:
+  ld a, [de]
+  ld [hl+], a
+
+  inc de
+  dec bc
+  ld a, b
+  or a, c
+  jp nz, @loop
+
+  ret
diff --git a/src/video.s b/src/video.s
index 515b1e5..5601141 100644
--- a/src/video.s
+++ b/src/video.s
@@ -2,6 +2,7 @@ vblank_wait:
   ld a, [RLY] 
   cp a, 144
   jp c, vblank_wait
+  ret
 
 lcd_off:
   ; *never* turn off LCD without waiting 
@@ -21,17 +22,13 @@ lcd_on:
 
 copy_tiles:
   ld de, tileset0
-  ld hl, VRAM9000 
+  ld hl, VRAM 
   ld bc, tileset0_end - tileset0
-@loop:
-  
-  ld a, [de]
-  ld [hl+], a
+  call memcpy
 
-  inc de
-  dec bc
-  ld a, b
-  or a, c
-  jp nz, @loop
+  ld de, tileset1
+  ld hl, VRAM9000 
+  ld bc, tileset1_end - tileset1 
+  call memcpy
 
   ret
-- 
2.30.2