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CCF Instruction

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This commit is contained in:
Franco Colmenarez 2021-10-19 10:30:36 -05:00
parent ad5211d057
commit 08513ae110
1 changed files with 22 additions and 1 deletions
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23
src/cpu.rs
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@ -1031,10 +1031,17 @@ impl CPU {
self.registers.set_flag(FlagRegister::Substract, true); self.registers.set_flag(FlagRegister::Substract, true);
self.registers.set_flag(FlagRegister::HalfCarry, true); self.registers.set_flag(FlagRegister::HalfCarry, true);
}, },
// Invert the carry flag
Opcode::CCF => {
self.registers.increment(Register::PC, 1);
self.registers.set_flag(FlagRegister::Carry, !self.registers.get_flag(FlagRegister::Carry));
self.registers.set_flag(FlagRegister::Substract, false);
self.registers.set_flag(FlagRegister::HalfCarry, false);
},
// Disable interrupts // Disable interrupts
Opcode::DI => { Opcode::DI => {
bus.write(0xFFFF, 0x00); // Disable all interrupts
self.registers.increment(Register::PC, 1); self.registers.increment(Register::PC, 1);
bus.write(0xFFFF, 0x00); // Disable all interrupts
}, },
Opcode::NOP => self.registers.increment(Register::PC, 1), Opcode::NOP => self.registers.increment(Register::PC, 1),
// _ => println!("Illegal instruction"), // _ => println!("Illegal instruction"),
@ -3005,6 +3012,20 @@ mod tests {
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), true); assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), true);
} }
#[test]
fn test_ccf_instructions() {
let mut cpu = CPU::new();
let mut bus = Bus::new();
cpu.registers.set_flag(FlagRegister::Substract, true);
cpu.registers.set_flag(FlagRegister::HalfCarry, true);
cpu.registers.set_flag(FlagRegister::Carry, false);
cpu.exec(Opcode::CCF, &mut bus);
assert_eq!(cpu.registers.get(Register::PC), 0x101);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), true);
}
#[test] #[test]
fn test_nop_instructions() { fn test_nop_instructions() {
let mut cpu = CPU::new(); let mut cpu = CPU::new();