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106 lines
3.0 KiB
Rust
106 lines
3.0 KiB
Rust
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#![allow(dead_code, non_snake_case)]
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use crate::tests::test_bus::RAMBus;
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use crate::r6502::{R6502, Bus, Registers, Flags};
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#[test]
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fn basic()
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{
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let mut cpu = R6502::new();
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let mut bus = RAMBus::new();
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// program address
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let addr = 0x0020 as u16;
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// Set the program counter address
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bus.write(0xFFFC, (addr & 0x00FF) as u8); // low byte
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bus.write(0xFFFD, ((addr & 0xFF00) >> 8) as u8); // high byte
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// Program to subtract 0x06 from 0x0A
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bus.write(addr, 0xE9); // SBC - Immediate mode
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bus.write(addr + 1, 0x06); // Argument
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// Restart cpu
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cpu.reset(&mut bus);
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// manually setup the cpu state
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cpu.set_flag(Flags::C);
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cpu.debug_set_reg(Registers::A, 0x0A);
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// Clock the cpu to run the program (Clock essentially runs one full instruction)
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cpu.clock(&mut bus);
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// Is 0x04 in the A register?
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assert_eq!(0x04, cpu.debug_get_reg(Registers::A), "wrong answer");
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assert_eq!(1, cpu.check_flag(Flags::C), "Carry bit should be set");
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assert_eq!(0, cpu.check_flag(Flags::V), "Overflow bit should not be set");
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}
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#[test]
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fn with_carry()
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{
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let mut cpu = R6502::new();
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let mut bus = RAMBus::new();
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// program address
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let addr = 0x0020 as u16;
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// Set the program counter address
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bus.write(0xFFFC, (addr & 0x00FF) as u8); // low byte
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bus.write(0xFFFD, ((addr & 0xFF00) >> 8) as u8); // high byte
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// Program to subtract 0x09 from 0x08
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bus.write(addr, 0xE9); // SBC - Immediate mode
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bus.write(addr + 1, 0x09); // Argument
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// Restart cpu
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cpu.reset(&mut bus);
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// manually setup the cpu state
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cpu.set_flag(Flags::C);
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cpu.debug_set_reg(Registers::A, 0x08);
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// Clock the cpu to run the program (Clock essentially runs one full instruction)
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cpu.clock(&mut bus);
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// Is -1 in the A register?
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assert_eq!(0xFF as u16, cpu.debug_get_reg(Registers::A), "Wrong answer");
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assert_eq!(0, cpu.check_flag(Flags::C), "Carry bit should not be set");
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assert_eq!(0, cpu.check_flag(Flags::V), "Overflow bit should not be set");
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}
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#[test]
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fn with_overflow()
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{
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let mut cpu = R6502::new();
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let mut bus = RAMBus::new();
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// program address
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let addr = 0x0020 as u16;
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// Set the program counter address
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bus.write(0xFFFC, (addr & 0x00FF) as u8); // low byte
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bus.write(0xFFFD, ((addr & 0xFF00) >> 8) as u8); // high byte
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// Program to subtract 0x7E from 0xFB (-5 - 126)
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bus.write(addr, 0xE9); // SBC - Immediate mode
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bus.write(addr + 1, 0x7E); // Argument
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// Restart cpu
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cpu.reset(&mut bus);
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// manually setup the cpu state
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cpu.set_flag(Flags::C);
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cpu.debug_set_reg(Registers::A, 0xFB);
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// Clock the cpu to run the program (Clock essentially runs one full instruction)
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cpu.clock(&mut bus);
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assert_eq!(0x7D, cpu.debug_get_reg(Registers::A), "Wrong answer");
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assert_eq!(1, cpu.check_flag(Flags::C), "Carry bit should be set");
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assert_eq!(1, cpu.check_flag(Flags::V), "Overflow bit should be set");
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}
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