From f275790aec4a796ed969b099364abfdf25385967 Mon Sep 17 00:00:00 2001
From: Rangi <remy.oukaour+rangi42@gmail.com>
Date: Thu, 2 Jul 2020 23:30:21 -0400
Subject: Add subdirectories to engine/ similar to pokecrystal

---
 engine/gfx/oam_dma.asm | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 engine/gfx/oam_dma.asm

(limited to 'engine/gfx/oam_dma.asm')

diff --git a/engine/gfx/oam_dma.asm b/engine/gfx/oam_dma.asm
new file mode 100644
index 00000000..b0d64675
--- /dev/null
+++ b/engine/gfx/oam_dma.asm
@@ -0,0 +1,26 @@
+WriteDMACodeToHRAM::
+; Since no other memory is available during OAM DMA,
+; DMARoutine is copied to HRAM and executed there.
+	ld c, $ff80 % $100
+	ld b, DMARoutineEnd - DMARoutine
+	ld hl, DMARoutine
+.copy
+	ld a, [hli]
+	ld [$ff00+c], a
+	inc c
+	dec b
+	jr nz, .copy
+	ret
+
+DMARoutine:
+	; initiate DMA
+	ld a, wOAMBuffer / $100
+	ld [rDMA], a
+
+	; wait for DMA to finish
+	ld a, $28
+.wait
+	dec a
+	jr nz, .wait
+	ret
+DMARoutineEnd:
-- 
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