From 2fd9cf1faa18404468d96a2f1dffb85e28176c56 Mon Sep 17 00:00:00 2001
From: Isaac Marovitz <isaacryu@icloud.com>
Date: Tue, 28 Nov 2023 19:09:23 -0500
Subject: [PATCH] Start MMU

---
 src/main.rs |  1 +
 src/mmu.rs  | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 src/mmu.rs

diff --git a/src/main.rs b/src/main.rs
index 7cbcffa..a9628ed 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,6 +13,7 @@ use winit::{event_loop::EventLoop, window::WindowBuilder};
 
 mod context;
 mod cpu;
+mod mmu;
 mod mode;
 mod registers;
 
diff --git a/src/mmu.rs b/src/mmu.rs
new file mode 100644
index 0000000..10d302e
--- /dev/null
+++ b/src/mmu.rs
@@ -0,0 +1,25 @@
+pub struct MMU {
+    wram: [u8; 0x8000],
+    hram: [u8; 0x7f],
+    interrupt: u8,
+}
+
+impl MMU {
+    pub fn read(&self, a: u16) -> u8 {
+        match a {
+            0xC000..=0xCFFF => self.wram[a as usize - 0xC000],
+            0xFF80..=0xFFFE => self.hram[a as usize - 0xFF80],
+            0xFFFF => self.interrupt,
+            _ => 0x00,
+        }
+    }
+
+    pub fn write(&mut self, a: u16, v: u8) {
+        match a {
+            0xC000..=0xCFFF => self.wram[a as usize - 0xC000] = v,
+            0xFF80..=0xFFFE => self.hram[a as usize - 0xFF80] = v,
+            0xFFFF => self.interrupt = v,
+            _ => {},
+        }
+    }
+}
\ No newline at end of file