From 3cd888d99149c6bb608d1c03fd697074a7f8617d Mon Sep 17 00:00:00 2001
From: Alex Janka <alex@alexjanka.com>
Date: Thu, 9 Feb 2023 12:14:55 +1100
Subject: [PATCH] oam dma transfers

---
 src/processor/memory.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/processor/memory.rs b/src/processor/memory.rs
index 8926cf2..1692957 100644
--- a/src/processor/memory.rs
+++ b/src/processor/memory.rs
@@ -6,6 +6,8 @@ use crate::{
 use minifb::Key;
 use std::io::{stdout, Write};
 
+use super::SplitRegister;
+
 pub(crate) mod rom;
 
 pub(crate) type Address = u16;
@@ -260,6 +262,17 @@ impl Memory {
                     // read-only addresses
                     println!("BANNED write: {:#X} to {:#X}", data, address);
                 }
+                0xFF46 => {
+                    if data > 0xDF {
+                        panic!("dma transfer out of bounds: {:#X}", data);
+                    }
+                    let mut addr: u16 = 0x0;
+                    addr.set_high(data);
+                    for l in 0x0..0xA0 {
+                        addr.set_low(l);
+                        self.oam[l as usize] = self.get(addr);
+                    }
+                }
                 _ => {
                     self.io[addr_l] = data;
                     // panic!("passed non-io address to io handler!");