From d2e7dda20f7ce8c064ac1200af34a9f967e3594b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Magalh=C3=A3es?= <joamag@gmail.com>
Date: Fri, 8 Jul 2022 17:08:27 +0100
Subject: [PATCH] feat: better bank handling support
---
src/mmu.rs | 3 ++-
src/rom.rs | 8 ++++++++
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/src/mmu.rs b/src/mmu.rs
index 853d19cd..15df0604 100644
--- a/src/mmu.rs
+++ b/src/mmu.rs
@@ -1,4 +1,4 @@
-use crate::{pad::Pad, ppu::Ppu, timer::Timer};
+use crate::{pad::Pad, ppu::Ppu, timer::Timer, rom::Rom};
pub const BIOS_SIZE: usize = 256;
pub const ROM_SIZE: usize = 32768;
@@ -251,6 +251,7 @@ impl Mmu {
}
struct Mbc1 {
+ rom: Rom,
rom_bank: u8,
}
diff --git a/src/rom.rs b/src/rom.rs
index d9b2a25b..279480fd 100644
--- a/src/rom.rs
+++ b/src/rom.rs
@@ -1,6 +1,8 @@
use core::fmt;
use std::fmt::{Display, Formatter};
+pub const BANK_SIZE: usize = 16384;
+
pub struct Rom {
data: Vec<u8>,
}
@@ -84,6 +86,12 @@ impl Rom {
&self.data
}
+ pub fn get_bank(&self, index: u8) -> &[u8] {
+ let start = index as usize * BANK_SIZE;
+ let end = (index + 1) as usize * BANK_SIZE;
+ &self.data[start..end]
+ }
+
pub fn title(&self) -> &str {
std::str::from_utf8(&self.data[0x0134..0x0143]).unwrap()
}
--
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