initial commit

src/cpu.rs

@@ -0,0 +1,57 @@
+use std::cell::RefCell;
+use std::rc::{Rc, Weak};
+
+use crate::bus::Bus;
+
+pub struct CPU
+{
+	acc: u8,
+	x: u8,
+	y: u8,
+	p: u8,
+	sp: u8,
+
+	pc: u16,
+
+	bus: Weak<RefCell<Bus>>
+}
+
+impl CPU 
+{
+	pub fn new(bus: &Rc<RefCell<Bus>>) -> CPU 
+	{
+		CPU {
+			acc: 0,
+			x: 0,
+			y: 0,
+			p: 0,
+			sp: 0,
+
+			pc: 0,
+
+			bus: Rc::downgrade(bus)
+		}
+	}
+
+	pub fn powerup(&mut self)
+	{
+		self.p = 0x34;
+
+		self.acc = 0;
+		self.x = 0;
+		self.y = 0;
+		self.sp = 0xFD;
+	}
+
+	pub fn execute(&mut self)
+	{
+		let bus = self.bus.upgrade().unwrap();
+		let opcode: u8 = bus.borrow().read_cpu(self.pc);
+		self.pc += 1;
+
+		match (opcode)
+		{
+			_ => panic!("Unimplemented opcode {}", opcode)
+		}
+	}
+}