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SCF instruction

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This commit is contained in:
Franco Colmenarez 2021-10-19 10:33:43 -05:00
parent 08513ae110
commit ff9fd48190
1 changed files with 32 additions and 0 deletions
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32
src/cpu.rs
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@ -1038,6 +1038,13 @@ impl CPU {
self.registers.set_flag(FlagRegister::Substract, false); self.registers.set_flag(FlagRegister::Substract, false);
self.registers.set_flag(FlagRegister::HalfCarry, false); self.registers.set_flag(FlagRegister::HalfCarry, false);
}, },
// Set the carry flag
Opcode::SCF => {
self.registers.increment(Register::PC, 1);
self.registers.set_flag(FlagRegister::Carry, true);
self.registers.set_flag(FlagRegister::Substract, false);
self.registers.set_flag(FlagRegister::HalfCarry, false);
},
// Disable interrupts // Disable interrupts
Opcode::DI => { Opcode::DI => {
self.registers.increment(Register::PC, 1); self.registers.increment(Register::PC, 1);
@ -3024,6 +3031,31 @@ mod tests {
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), false); 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::HalfCarry), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), true); assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), true);
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, true);
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), false);
}
#[test]
fn test_scf_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::SCF, &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]