Began skeleton of new UninitializedW5500 struct and Bus trait/impls

src/uninitialized_w5500.rs

@@ -0,0 +1,34 @@
+use embedded_hal::spi::FullDuplex;
+use embedded_hal::digital::v2::OutputPin;
+use bus::{Bus, FourWire, ThreeWire};
+use w5500::W5500;
+
+pub struct UninitializedW5500<Spi: FullDuplex<u8>, SpiBus: Bus<Spi>> {
+    bus: SpiBus,
+    spi: Spi,
+}
+
+impl<Spi: FullDuplex<u8>, SpiBus: Bus<Spi>> UninitializedW5500<Spi, SpiBus> {
+    pub fn initialize() -> W5500 {
+        // TODO actually initialize chip
+        W5500 {}
+    }
+}
+
+impl<Spi: FullDuplex<u8>, ChipSelect: OutputPin> UninitializedW5500<Spi, FourWire<ChipSelect>> {
+    pub fn new(spi: Spi, cs: ChipSelect) -> Self {
+        Self { spi, bus: FourWire::new(cs) }
+    }
+    pub fn deactivate(self) -> (Spi, ChipSelect) {
+        (self.spi, self.bus.release())
+    }
+}
+
+impl<Spi: FullDuplex<u8>> UninitializedW5500<Spi, ThreeWire> {
+    pub fn new(spi: Spi) -> Self {
+        Self { spi, bus: ThreeWire::new() }
+    }
+    pub fn deactivate(self) -> Spi {
+        self.spi
+    }
+}