Partially restructure the library

This also changes bit-shifting semantics, shifting left and then right
instead of the other way around.

1 files changed, 22 insertions, 0 deletions

diff --git a/src/components/device_bus.rs b/src/components/device_bus.rs
new file mode 100644
index 0000000..9854ee9
--- /dev/null
+++ b/src/components/device_bus.rs
@@ -0,0 +1,22 @@
+use crate::*;
+
+
+pub trait DeviceBus {
+    fn read(&mut self, port: u8) -> u8;
+    fn write(&mut self, port: u8, value: u8) -> Option<Signal>;
+    fn wake(&mut self) -> bool;
+}
+
+
+pub trait Device {
+    fn read(&mut self, port: u8) -> u8;
+    fn write(&mut self, port: u8, value: u8) -> Option<Signal>;
+    fn wake(&mut self) -> bool;
+}
+
+impl Device for () {
+    fn read(&mut self, _: u8) -> u8 { 0 }
+    fn write(&mut self, _: u8, _: u8) -> Option<Signal> { None }
+    fn wake(&mut self) -> bool { false }
+}
+