public void ShiftRightArithmetic()
{
Memory memory = new Memory();
var bitUnit = new BitUnit(memory);
byte value = 0b11110000;
byte flags = 0b01100000;
// Reset carry
bitUnit.ShiftRightArithmetic(ref value, ref flags);
Assert.Equal(0b11111000, value);
Assert.Equal(0x0, flags);
// Set carry
value = 0b00001111;
flags = 0b01100000;
bitUnit.ShiftRightArithmetic(ref value, ref flags);
Assert.Equal(0b00000111, value);
Assert.Equal(0b00010000, flags);
//Set zero
value = 0b00000001;
flags = 0b01100000;
bitUnit.ShiftRightArithmetic(ref value, ref flags);
Assert.Equal(0x0, value);
Assert.Equal(0b10010000, flags);
}
public CPUTests(ITestOutputHelper testOutputHelper)
{
this.testOutputHelper = testOutputHelper;
memory = new Memory(new byte[]
{
IMMEDIATE_BYTE,
(IMMEDIATE_WORD >> 8) & 0xFF
});
display = new BlankDisplay();
ppu = new PPU(memory, display);
loadUnit = A.Fake <LoadUnit>();
alu = A.Fake <ALU>();
miscUnit = A.Fake <MiscUnit>();
jumpUnit = A.Fake <JumpUnit>();
bitUnit = A.Fake <BitUnit>();
cpu = new CPU(memory, ppu, loadUnit, alu, miscUnit, jumpUnit, bitUnit)
{
A = 0x0A,
B = 0x0B,
C = 0x0C,
D = 0x0D,
E = 0x0E,
H = 0xAA,
L = 0xBB,
PC = 0x00,
SP = 0xFF
};
memory.WriteByte(0xAABB, MEM_HL_BYTE);
}
public CPU(Memory memory, PPU ppu, LoadUnit loadUnit, ALU alu, MiscUnit miscUnit, JumpUnit jumpUnit, BitUnit bitUnit)
{
this.ppu = ppu;
this.loadUnit = loadUnit;
this.alu = alu;
this.miscUnit = miscUnit;
this.jumpUnit = jumpUnit;
this.bitUnit = bitUnit;
this.loadUnit.TickEvent += Tick;
this.alu.TickEvent += Tick;
this.jumpUnit.TickEvent += Tick;
this.bitUnit.TickEvent += Tick;
CreateLoadUnitOpCodes();
CreateALUOpCodes();
CreateMiscOpCodes();
CreateJumpOpCodes();
CreateBitUnitOpCodes();
this.memory = memory;
this.timer = new Timer(memory);
this.memory.DivResetEvent += DivResetHandler;
interruptVector = new Dictionary <Interrupt, ushort>
{
{ Interrupt.VBlank, 0x40 },
{ Interrupt.LCDStat, 0x48 },
{ Interrupt.Timer, 0x50 },
{ Interrupt.Serial, 0x58 },
{ Interrupt.Joypad, 0x60 }
};
}
public void SwapSetsZeroFlag()
{
var memory = new Memory();
var bitUnit = new BitUnit(memory);
byte flags = 0b01110000;
byte register = 0x00;
bitUnit.Swap(ref register, ref flags);
Assert.Equal(0x00, register);
Assert.Equal(0b10000000, flags);
}
public void SwapChangesNibbles()
{
var memory = new Memory();
var bitUnit = new BitUnit(memory);
byte flags = 0b11110000;
byte register = 0xAC;
bitUnit.Swap(ref register, ref flags);
Assert.Equal(0xCA, register);
Assert.Equal(0x00, flags);
}
public void SetBitTest()
{
var memory = new Memory();
var bitUnit = new BitUnit(memory);
byte value = 0x81;
bitUnit.SetBit(ref value, 7, false);
Assert.Equal(0x1, value);
bitUnit.SetBit(ref value, 7, true);
Assert.Equal(0x81, value);
}
public void RotateALeftThroughCarry()
{
var memory = new Memory();
var bitUnit = new BitUnit(memory);
byte flags = 0b11100000;
byte register = 0b10010000;
bitUnit.RotateLeftThroughCarry(ref register, ref flags, true);
Assert.Equal(0b00100000, register);
Assert.Equal(0b00010000, flags);
}
public void RotateLeftThroughCarryInMemoryTest()
{
var memory = new Memory();
var bitUnit = new BitUnit(memory);
byte flags = 0b01100000;
memory.WriteByte(0xABBA, 0b11111110);
bitUnit.RotateLeftThroughCarry(0xAB, 0xBA, ref flags);
Assert.Equal(0b11111100, memory.ReadByte(0xABBA));
Assert.Equal(0b00010000, flags);
}
public void SwapChangesNibblesInMemory()
{
var memory = new Memory();
var bitUnit = new BitUnit(memory);
byte flags = 0b11110000;
memory.WriteByte(0xACDC, 0xAB);
bitUnit.Swap(0xAC, 0xDC, ref flags);
Assert.Equal(0xBA, memory.ReadByte(0xACDC));
Assert.Equal(0x00, flags);
}
public void ShiftRightArithmeticInMemory()
{
Memory memory = new Memory();
var bitUnit = new BitUnit(memory);
memory.WriteByte(0xACDC, 0b10000001);
byte flags = 0b11100000;
bitUnit.ShiftRightArithmetic(0xAC, 0xDC, ref flags);
Assert.Equal(0b11000000, memory.ReadByte(0xACDC));
Assert.Equal(0b00010000, flags);
}
public void ShiftRightLogicInMemory()
{
var memory = new Memory();
var bitUnit = new BitUnit(memory);
memory.WriteByte(0xABCD, 0xFF);
byte flags = 0b11100000;
bitUnit.ShiftRightLogic(0xAB, 0xCD, ref flags);
Assert.Equal(0b01111111, memory.ReadByte(0xABCD));
Assert.Equal(0b00010000, flags);
}
public void RotateRightInMemory()
{
Memory memory = new Memory();
var bitUnit = new BitUnit(memory);
memory.WriteByte(0xACDC, 0b00000011);
byte flags = 0b01100000;
bitUnit.RotateRight(0xAC, 0xDC, ref flags);
Assert.Equal(0b10000001, memory.ReadByte(0xACDC));
Assert.Equal(0b00010000, flags);
}
public void SetBitInMemory()
{
var memory = new Memory();
var bitUnit = new BitUnit(memory);
memory.WriteByte(0xABCD, 0xFF);
bitUnit.SetBit(0xAB, 0xCD, 0, false);
Assert.Equal(0xFE, memory.ReadByte(0xABCD));
memory.WriteByte(0xABCD, 0xF1);
bitUnit.SetBit(0xAB, 0xCD, 1, true);
Assert.Equal(0xF3, memory.ReadByte(0xABCD));
}
public void ComplementCarryTest()
{
var bitUnit = new BitUnit(new Memory());
byte flags = 0b00010000;
bitUnit.ComplementCarry(ref flags);
Assert.Equal(0b00000000, flags);
flags = 0b10100000;
bitUnit.ComplementCarry(ref flags);
Assert.Equal(0b10010000, flags);
}
public void RotateRightThroughCarry()
{
// No carry
var bitUnit = new BitUnit(new Memory());
byte value = 0b01111110;
byte flags = 0b01100000;
bitUnit.RotateRightThroughCarry(ref value, ref flags, false);
Assert.Equal(0b00111111, value);
Assert.Equal(0b00000000, flags);
// From carry
value = 0b01111110;
flags = 0b01110000;
bitUnit.RotateRightThroughCarry(ref value, ref flags, false);
Assert.Equal(0b10111111, value);
Assert.Equal(0b00000000, flags);
// To carry
value = 0b01111101;
flags = 0b01100000;
bitUnit.RotateRightThroughCarry(ref value, ref flags, false);
Assert.Equal(0b00111110, value);
Assert.Equal(0b00010000, flags);
// From and to carry
value = 0b00000001;
flags = 0b01110000;
bitUnit.RotateRightThroughCarry(ref value, ref flags, false);
Assert.Equal(0b10000000, value);
Assert.Equal(0b00010000, flags);
// Set zero flag
value = 0x1;
flags = 0b01100000;
bitUnit.RotateRightThroughCarry(ref value, ref flags, false);
Assert.Equal(0x0, value);
Assert.Equal(0b10010000, flags);
}
public void RotateLeftThroughCarryTest()
{
// No carry
var bitUnit = new BitUnit(new Memory());
byte value = 0b01111110;
byte flags = 0b01100000;
bitUnit.RotateLeftThroughCarry(ref value, ref flags, false);
Assert.Equal(0b11111100, value);
Assert.Equal(0b00000000, flags);
// Test to carry
value = 0b11111110;
flags = 0b11100000;
bitUnit.RotateLeftThroughCarry(ref value, ref flags, false);
Assert.Equal(0b11111100, value);
Assert.Equal(0b00010000, flags);
// Test from carry
value = 0b01111110;
flags = 0b11100000;
bitUnit.RotateLeftThroughCarry(ref value, ref flags, false);
Assert.Equal(0b11111100, value);
Assert.Equal(0b00000000, flags);
// Test to and from carry
value = 0b11111110;
flags = 0b11110000;
bitUnit.RotateLeftThroughCarry(ref value, ref flags, false);
Assert.Equal(0b11111101, value);
Assert.Equal(0b00010000, flags);
// Result zero
value = 0x0;
flags = 0x0;
bitUnit.RotateLeftThroughCarry(ref value, ref flags, false);
Assert.Equal(0x0, value);
Assert.Equal(0b10000000, flags);
}
public void RotateLeftTest()
{
// No carry
var memory = new Memory();
var bitUnit = new BitUnit(memory);
byte flags = 0b11100000;
byte register = 0b01010000;
bitUnit.RotateLeft(ref register, ref flags, false);
Assert.Equal(0b10100000, register);
Assert.Equal(0b00000000, flags);
// Set carry
flags = 0b11100000;
register = 0b10010000;
bitUnit.RotateLeft(ref register, ref flags, false);
Assert.Equal(0b00100001, register);
Assert.Equal(0b00010000, flags);
// Sets zero when result is zero
flags = 0b11110000;
register = 0x0;
bitUnit.RotateLeft(ref register, ref flags, false);
Assert.Equal(0x0, register);
Assert.Equal(0b10000000, flags);
// Resets zero always when forced
flags = 0b10010000;
register = 0b10101111;
bitUnit.RotateLeft(ref register, ref flags, true);
Assert.Equal(0b01011111, register);
Assert.Equal(0b00010000, flags);
}
public void RotateRight()
{
// No carry
var bitUnit = new BitUnit(new Memory());
byte value = 0b01111110;
byte flags = 0b01110000;
bitUnit.RotateRight(ref value, ref flags, false);
Assert.Equal(0b00111111, value);
Assert.Equal(0x0, flags);
// Set carry
value = 0b10000001;
flags = 0b01100000;
bitUnit.RotateRight(ref value, ref flags, false);
Assert.Equal(0b11000000, value);
Assert.Equal(0b00010000, flags);
// Set zero
value = 0x0;
flags = 0b01110000;
bitUnit.RotateRight(ref value, ref flags, false);
Assert.Equal(0x0, value);
Assert.Equal(0b10000000, flags);
// Reset zero forced
value = 0x0;
flags = 0b11110000;
bitUnit.RotateRight(ref value, ref flags, true);
Assert.Equal(0x0, value);
Assert.Equal(0b00000000, flags);
}
public void TestBitTest()
{
var bitUnit = new BitUnit(new Memory());
byte value = 0b01010011;
byte flags = 0b01010000;
bitUnit.TestBit(value, 7, ref flags);
Assert.Equal(0b10110000, flags);
flags = 0b10010000;
bitUnit.TestBit(value, 6, ref flags);
Assert.Equal(0b00110000, flags);
flags = 0b00010000;
bitUnit.TestBit(value, 5, ref flags);
Assert.Equal(0b10110000, flags);
flags = 0b10010000;
bitUnit.TestBit(value, 4, ref flags);
Assert.Equal(0b00110000, flags);
flags = 0b00000000;
bitUnit.TestBit(value, 3, ref flags);
Assert.Equal(0b10100000, flags);
flags = 0b00000000;
bitUnit.TestBit(value, 2, ref flags);
Assert.Equal(0b10100000, flags);
flags = 0b10000000;
bitUnit.TestBit(value, 1, ref flags);
Assert.Equal(0b00100000, flags);
flags = 0b10000000;
bitUnit.TestBit(value, 0, ref flags);
Assert.Equal(0b00100000, flags);
}
public void ComplementTest()
{
var memory = new Memory();
var bitUnit = new BitUnit(memory);
byte value = 0xFF;
byte flags = 0x00;
bitUnit.Complement(ref value, ref flags);
Assert.Equal(0x00, value);
Assert.Equal(0b01100000, flags);
value = 0x00;
flags = 0x00;
bitUnit.Complement(ref value, ref flags);
Assert.Equal(0xFF, value);
Assert.Equal(0b01100000, flags);
value = 0x0F;
flags = 0x00;
bitUnit.Complement(ref value, ref flags);
Assert.Equal(0xF0, value);
Assert.Equal(0b01100000, flags);
}
public void ShiftRightLogic()
{
var bitUnit = new BitUnit(new Memory());
byte value = 0x00;
byte flags = 0xF0;
bitUnit.ShiftRightLogic(ref value, ref flags);
Assert.Equal(0x0, value);
Assert.Equal(0b10000000, flags);
value = 0x01;
flags = 0xF0;
bitUnit.ShiftRightLogic(ref value, ref flags);
Assert.Equal(0x0, value);
Assert.Equal(0b10010000, flags);
value = 0x0F;
flags = 0xF0;
bitUnit.ShiftRightLogic(ref value, ref flags);
Assert.Equal(0x07, value);
Assert.Equal(0b00010000, flags);
value = 0x10;
flags = 0xF0;
bitUnit.ShiftRightLogic(ref value, ref flags);
Assert.Equal(0x08, value);
Assert.Equal(0x0, flags);
value = 0x1F;
flags = 0xF0;
bitUnit.ShiftRightLogic(ref value, ref flags);
Assert.Equal(0x0F, value);
Assert.Equal(0b00010000, flags);
value = 0x7F;
flags = 0xF0;
bitUnit.ShiftRightLogic(ref value, ref flags);
Assert.Equal(0x3F, value);
Assert.Equal(0b00010000, flags);
value = 0x80;
flags = 0xF0;
bitUnit.ShiftRightLogic(ref value, ref flags);
Assert.Equal(0x40, value);
Assert.Equal(0x0, flags);
value = 0xF0;
flags = 0xF0;
bitUnit.ShiftRightLogic(ref value, ref flags);
Assert.Equal(0x78, value);
Assert.Equal(0x0, flags);
value = 0xFF;
flags = 0xF0;
bitUnit.ShiftRightLogic(ref value, ref flags);
Assert.Equal(0x7F, value);
Assert.Equal(0b00010000, flags);
}