Adds ASL instruction

src/tests/instructions/mod.rs

@@ -2,7 +2,7 @@
 #![allow(dead_code, non_snake_case)]
 
 use crate::tests::test_bus::RAMBus;
-use crate::r6502::{R6502, Bus, Registers};
+use crate::r6502::{R6502, Bus, Registers, Flags};
 
 /////////////////////////////////////////////////////////////////////
 //				GROUP ONE
@@ -172,4 +172,34 @@ mod SBC;
 //				GROUP TWO
 /////////////////////////////////////////////////////////////////////
 
-// TODO: TEST ASL
+#[test]
+fn ASL()
+{
+    let mut cpu = R6502::new();
+    let mut bus = RAMBus::new();
+
+    // program address
+    let addr = 0x0020 as u16;
+
+    // Set the program counter address
+    bus.write(0xFFFC, (addr & 0x00FF) as u8);  // low byte
+    bus.write(0xFFFD, ((addr & 0xFF00) >> 8) as u8);  // high byte
+
+    // Program to left shift the value in the accumulator
+    bus.write(addr, 0x0A); // ASL - Accumulator mode
+
+    // Restart cpu
+    cpu.reset(&mut bus);
+
+    // manually setup the cpu registers
+    cpu.debug_set_reg(Registers::A, 0x98);
+
+    // Clock the cpu to run the program (Clock essentially runs one full instruction)
+    cpu.clock(&mut bus);
+
+    // Is 0x30 in the A register?
+    assert_eq!(0x30, cpu.debug_get_reg(Registers::A));
+    assert_eq!(0, cpu.check_flag(Flags::Z), "Zero flag should not be set");
+    assert_eq!(1, cpu.check_flag(Flags::C), "Carry flag should be set");
+    assert_eq!(0, cpu.check_flag(Flags::N), "Negative flag should not be set");
+}

todo/todo.todo

@@ -40,7 +40,7 @@ Instructions:
         ✔ 111	SBC @done(23-11-09 13:24)
 
     GROUP TWO:
-        ☐ 000	ASL
+        ✔ 000	ASL @done(23-11-30 17:31)
         ☐ 001	ROL
         ☐ 010	LSR
         ☐ 011	ROR