Add Memory trait for Rom, refactor instantiating

1 files changed, 18 insertions, 0 deletions

diff --git a/src/memory.rs b/src/memory.rs
new file mode 100644
index 0000000..372a029
--- /dev/null
+++ b/src/memory.rs
@@ -0,0 +1,18 @@
+extern crate num_traits;
+
+pub trait Memory<Addr>
+    where Addr: Copy + core::ops::Add<Output = Addr> + num_traits::identities::One
+{
+    fn get(&self, a: Addr) -> u8;
+
+    fn set(&mut self, a: Addr, v: u8);
+
+    fn get_word(&self, a: Addr) -> u16 {
+        u16::from(self.get(a)) | (u16::from(self.get(a + Addr::one())) << 8)
+    }
+
+    fn set_word(&mut self, a: Addr, v: u16) {
+        self.set(a, (v & 0xFF) as u8);
+        self.set(a + Addr::one(), (v >> 8) as u8)
+    }
+}