private void DecrementRegister(Register16Bit register)
{
ushort initialValue = registers.GetRegisterValue(register);
ushort newValue = (ushort)(initialValue - 1);
registers.SetRegisterValue(register, newValue);
}
private void AddValueToRegister(Register16Bit register, ushort value)
{
ushort oldRegisterValue = registers.GetRegisterValue(register);
ushort newRegisterValue = (ushort)(oldRegisterValue + value);
registers.SetRegisterValue(register, newRegisterValue);
ProcessFlags(oldRegisterValue, newRegisterValue);
}
public void Register_can_be_set_when_clock_is_false()
{
var register16Bit = new Register16Bit();
register16Bit.Do(true, new Byte2(17), false);
var output = register16Bit.Do(false, new Byte2(0), true);
output.ToInt16().Should().Be(17);
}
public void SetRegisterValue(Register16Bit register, ushort value)
{
switch (register)
{
case Register16Bit.SP: SP = value; break;
case Register16Bit.PC: PC = value; break;
case Register16Bit.AF: AF = value; break;
case Register16Bit.BC: BC = value; break;
case Register16Bit.DE: DE = value; break;
case Register16Bit.HL: HL = value; break;
default: throw new ArgumentException("16-bit register does not exist: " + register.ToString());
}
}
public ushort GetRegisterValue(Register16Bit register)
{
switch (register)
{
case Register16Bit.SP: return(SP);
case Register16Bit.PC: return(PC);
case Register16Bit.AF: return(AF);
case Register16Bit.BC: return(BC);
case Register16Bit.DE: return(DE);
case Register16Bit.HL: return(HL);
default: throw new ArgumentException("16-bit register does not exist: " + register.ToString());
}
}
private void Pop(Register16Bit register)
{
registers.SetRegisterValue(register, Pop());
}
private void Push(Register16Bit register)
{
Push(registers.GetRegisterValue(register));
}
private void LoadIntoRegister(Register16Bit register, int value)
{
LoadIntoRegister(register, (ushort)value);
}
private void LoadIntoRegister(Register16Bit register, ushort value)
{
registers.SetRegisterValue(register, value);
}
