RE6502/src/tests/instructions/LDA.rs

#![allow(dead_code, non_snake_case)]

use crate::tests::test_bus::RAMBus;
use crate::r6502::{R6502, Bus, Registers};

#[test]
fn IMM() 
{
    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 load 0x08 into the accumulator
    bus.write(addr, 0xA9); // LDA - Immediate mode
    bus.write(addr + 1, 0x08);  // Argument

     // Restart cpu
    cpu.reset(&mut bus);

    // Clock the cpu to run the program (Clock essentially runs one full instruction)
    cpu.clock(&mut bus);

    // Is 0x08 in the A register?
    assert_eq!(0x08, cpu.debug_get_reg(Registers::A));
}

#[test]
fn ZP0() 
{
    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

    // Manually put 0x08 into memory in the zero page
    bus.write(0x000A, 0x08);

    // Program to load 0x08 into the accumulator
    bus.write(addr, 0xA5); // LDA - Zero Page mode
    bus.write(addr + 1, 0x0A);  // Argument

     // Restart cpu
    cpu.reset(&mut bus);

    // Clock the cpu to run the program (Clock essentially runs one full instruction)
    cpu.clock(&mut bus);

    // Is 0x08 in the A register?
    assert_eq!(0x08, cpu.debug_get_reg(Registers::A));
}

#[test]
fn ZPX() 
{
    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

    // Manually put 0x08 into memory in the zero page
    bus.write(0x000A, 0x08);

    // Program to load 0x08 into the accumulator
    bus.write(addr, 0xB5); // LDA - Zero Page, X mode
    bus.write(addr + 1, 0x04);  // Argument

     // Restart cpu
    cpu.reset(&mut bus);

    // manually setup the cpu registers
    cpu.debug_set_reg(Registers::X, 0x06);

    // Clock the cpu to run the program (Clock essentially runs one full instruction)
    cpu.clock(&mut bus);

    // Is 0x08 in the A register?
    assert_eq!(0x08, cpu.debug_get_reg(Registers::A));
}

#[test]
fn ABS() 
{
    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

    // Manually put 0x08 into memory in the zero page
    bus.write(0x010A, 0x08);

    // Program to load 0x08 into the accumulator
    bus.write(addr, 0xAD); // LDA - Absolute mode
    bus.write(addr + 1, 0x0A);  // Argument lo word
    bus.write(addr + 2, 0x01);  // Argument hi word

     // Restart cpu
    cpu.reset(&mut bus);

    // Clock the cpu to run the program (Clock essentially runs one full instruction)
    cpu.clock(&mut bus);

    // Is 0x08 in the A register?
    assert_eq!(0x08, cpu.debug_get_reg(Registers::A));
}

#[test]
fn ABX() 
{
    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

    // Manually put 0x08 into memory in the zero page
    bus.write(0x010B, 0x08);

    // Program to load 0x08 into the accumulator
    bus.write(addr, 0xBD); // LDA - Absolute, X mode
    bus.write(addr + 1, 0x0A);  // Argument lo word
    bus.write(addr + 2, 0x01);  // Argument hi word

     // Restart cpu
    cpu.reset(&mut bus);
    
    // manually setup the cpu registers
    cpu.debug_set_reg(Registers::X, 0x01);

    // Clock the cpu to run the program (Clock essentially runs one full instruction)
    cpu.clock(&mut bus);

    // Is 0x08 in the A register?
    assert_eq!(0x08, cpu.debug_get_reg(Registers::A));
}

#[test]
fn ABY() 
{
    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

    // Manually put 0x08 into memory in the zero page
    bus.write(0x010B, 0x08);

    // Program to load 0x08 into the accumulator
    bus.write(addr, 0xB9); // LDA - Absolute, X mode
    bus.write(addr + 1, 0x0A);  // Argument lo word
    bus.write(addr + 2, 0x01);  // Argument hi word

     // Restart cpu
    cpu.reset(&mut bus);
    
    // manually setup the cpu registers
    cpu.debug_set_reg(Registers::Y, 0x01);

    // Clock the cpu to run the program (Clock essentially runs one full instruction)
    cpu.clock(&mut bus);

    // Is 0x08 in the A register?
    assert_eq!(0x08, cpu.debug_get_reg(Registers::A));
}