Quick start of a background module

src/io.rs

@@ -11,3 +11,4 @@ use super::*;
 pub mod display;
 pub mod dma;
 pub mod keypad;
+pub mod background;

src/io/background.rs

@@ -0,0 +1,17 @@
+//! Module for Background controls
+
+use super::*;
+
+newtype! {
+  BackgroundControlSetting, u16
+}
+impl BackgroundControlSetting {
+  pub const fn from_screen_base_block(screen_base_block: u16) -> Self {
+    BackgroundControlSetting(screen_base_block << 8) // TODO: mask this for correctness
+  }
+}
+
+pub struct BG0;
+impl BG0 {
+  pub const BG0CNT: VolAddress<BackgroundControlSetting> = unsafe { VolAddress::new_unchecked(0x400_0008) };
+}