stripped everything down - starting from scratch. reading obj file works

src/main.rs

@@ -1,63 +1,22 @@
-const PC_START: u16 = 0x3000;
+mod mem;
-
+use std::env;
-#[allow(dead_code)]
+use std::fs;
-enum Registers {
+use std::io;
-	R0 = 0,
+use std::io::Read;
-	R1,
-	R2,
-	R3,
-	R4,
-	R5,
-	R6,
-	R7,
-	PC,
-	COND,
-	COUNT
-}
-
-#[allow(dead_code)]
-enum Opcodes {
-	// https://www.cs.utexas.edu/~fussell/courses/cs310h/lectures/Lecture_10-310h.pdf
-	ADD = 0, // add
-	AND, // and
-	NOT, // not (bitwise)
-	LD, // load (pc relative)
-	LDI, // load indirect
-	LDR, // load base + offset
-	LEA, // load immediate
-	ST, // store pc relative
-	STR, // store base + offset
-	STI, // store indirect
-	BR, // branch
-	JSR, // jump register
-	JMP, // jump
-	RTI, // return from interrupt (unused)
-	TRAP, // trap
-}
-
-#[allow(dead_code)]
-enum ConditionFlags {
-	POS = 1 << 0,
-	ZERO = 1 << 1,
-	NEG = 1 << 2,
-}
 
 fn main() {
-	let _memory:[u16; 1 << 16] = [0; 1 << 16];
+	let args: Vec<String> = env::args().collect();
-	let mut registers:[u16; Registers::COUNT as usize] = [0; Registers::COUNT as usize];
+	let	path = args.get(1).expect("enter a file please!");
-	
+	let file = fs::File::open(path).expect("couldnt open file");
-	registers[Registers::COND as usize] = ConditionFlags::ZERO as u16;
+	let mut reader = io::BufReader::new(file);
-	registers[Registers::PC as usize] = PC_START;
+	let mut values = Vec::new();
-
+	let mut buffer:[u8;2] = [0;2];
-	// set running state
+	while reader.read_exact(&mut buffer).is_ok() {
-	let mut running:bool = true;
+		let instruction = u16::from_be_bytes(buffer);
-	while running {
+		values.push(instruction);
-		let index: u16 = registers[Registers::PC as usize];
+	}
-		let mut instr:u16 = _memory[index as usize];
+	println!("data: {:?}\n", values);
-		registers[Registers::PC as usize] += 1;
+	for data in values{
-		match instr >> 12 {
+		println!("hex data: {:#06X}", data);
-		  op if op == Opcodes::ADD as u16 => todo!(),
-			_ => todo!(),
-		}
 	}
 }