protected void RunEmulator(IEmulator emulator, Func <bool> tickFunc)
{
IProcessorCore cpu = (IProcessorCore)emulator.Components.First(c => c.Name == "Ricoh 2A03 CPU");
IComponentWithClock ppu = (IComponentWithClock)emulator.Components.First(c => c.Name == "Ricoh 2C02 PPU");
IComponentWithClock apu = (IComponentWithClock)emulator.Components.First(c => c.Name == "NES APU");
while (true)
{
if (tickFunc != null && !tickFunc())
{
break;
}
int cycles = cpu.Step();
if (cycles < 0)
{
Assert.Fail("CPU step failed!");
break;
}
for (int i = 0; i < cycles; i++)
{
// PPU ticks 3 times during each CPU cycle
ppu.Tick();
ppu.Tick();
ppu.Tick();
}
for (int i = 0; i < cycles; i++)
{
apu.Tick();
}
}
}
internal NesApu(IMemoryBus cpuBus, IProcessorCore cpu)
{
this.cpuIrq = cpu.GetInterruptByName("IRQ");
this.pulse1 = new PulseChannel(true);
this.pulse2 = new PulseChannel(false);
this.triangle = new TriangleChannel();
this.noise = new NoiseChannel();
this.dmc = new DeltaChannel(cpuBus, cpuIrq);
this.isApuCycle = false;
this.buffer = new byte[NesApu.BUFFER_SIZE];
this.ptr = Marshal.AllocHGlobal(4);
}
void IEmulator.Run()
{
int cycles;
int cycleCount = 0;
Stopwatch sw = new Stopwatch();
sw.Start();
this.run = true;
IProcessorCore core = (IProcessorCore)this.cpu;
IComponentWithClock ppuClock = (IComponentWithClock)this.ppu;
IComponentWithClock apuClock = (IComponentWithClock)this.cpu.APU;
while (this.run)
{
cycles = core.Step();
if (cycles < 0)
{
break;
}
for (int i = 0; i < cycles; i++)
{
// PPU ticks 3 times during each CPU cycle
ppuClock.Tick();
ppuClock.Tick();
ppuClock.Tick();
}
for (int i = 0; i < cycles; i++)
{
apuClock.Tick();
}
cycleCount += cycles;
if (sw.ElapsedMilliseconds >= 1000)
{
Trace.WriteLine(String.Format("Emulated clock speed: {0} MHz", cycleCount / (1000000f)));
cycleCount = 0;
sw.Restart();
}
}
stopEvent.Set();
}
public void RunCpuTest()
{
IEmulator emulator = this.GetInstance();
emulator.LoadFile(@"TestRoms\nestest\nestest.nes");
List <string> expectedOutput = new List <string>(File.ReadAllLines(@"TestResources\CpuTests\nestest.expected"));
IProcessorCore cpu = (IProcessorCore)emulator.Components.First(c => c.Name == "Ricoh 2A03 CPU");
IComponentWithRegisters ppu = (IComponentWithRegisters)emulator.Components.First(c => c.Name == "Ricoh 2C02 PPU");
IMemoryBus cpuBus = (IMemoryBus)emulator.Components.First(c => c.Name == "CPU Bus");
// Jump to automated test entry point
cpu.GetRegisterByName("PC").Value = 0xC000;
// Set initial state
cpu.GetRegisterByName("S").Value = 0xFD;
ppu.GetRegisterByName("cycle").Value = 0;
ppu.GetRegisterByName("scanline").Value = 241;
IEnumerator <string> outputLineEnumerator = expectedOutput.GetEnumerator();
outputLineEnumerator.MoveNext();
base.RunEmulator(emulator, () =>
{
string state = this.DumpEmulatorState(cpu, ppu, cpuBus);
string expectedOutputLine = outputLineEnumerator.Current;
if (!expectedOutputLine.StartsWith("#") &&
!String.Equals(state, expectedOutputLine, StringComparison.Ordinal))
{
Debug.WriteLine("**** {0}", (object)state);
Debug.WriteLine("Exp: {0}", (object)expectedOutputLine);
Assert.Fail("Output mismatch!");
return(false);
}
Debug.WriteLine(state);
return(outputLineEnumerator.MoveNext());
});
}
// Dump current CPU/PPU state in Nintendulator-ish format
private string DumpEmulatorState(IProcessorCore cpu, IComponentWithRegisters ppu, IMemoryBus cpuBus)
{
UInt16 PC = (UInt16)cpu.GetRegisterByName("PC").Value;
byte A = (byte)cpu.GetRegisterByName("A").Value;
byte X = (byte)cpu.GetRegisterByName("X").Value;
byte Y = (byte)cpu.GetRegisterByName("Y").Value;
string P = cpu.GetRegisterByName("P").FormattedValue;
byte S = (byte)cpu.GetRegisterByName("S").Value;
int cycle = ppu.GetRegisterByName("cycle").Value;
int scanline = ppu.GetRegisterByName("scanline").Value;
StringBuilder state = new StringBuilder();
state.AppendFormat("{0:X4} ", PC);
IEnumerable <byte> instructionBytes = cpu.GetInstructionBytes(PC);
if (!instructionBytes.Any())
{
state.AppendFormat("UNKNOWN: {0:X2}", cpuBus.Read(PC));
return(state.ToString());
}
IInstruction instruction = cpu.DecodeInstruction(instructionBytes);
state.AppendFormat("{0,-8} {1,4} {2} {3}",
String.Join(" ", instructionBytes.Select(b => String.Format("{0:X2}", b))),
instruction.Mnemonic,
instruction.Operands,
instruction.OperandsDetail);
state.Append(' ', 48 - state.Length);
state.AppendFormat("A:{0:X2} X:{1:X2} Y:{2:X2} P:{3} SP:{4:X2} CYC:{5,3} SL:{6}",
A, X, Y, P, S, cycle, scanline);
return(state.ToString());
}
internal Ricoh2C02(IProcessorCore cpu, IMemoryBus cpuBus, IMemoryBus ppuBus)
{
this.ppuBus = ppuBus;
this.vbi = cpu.GetInterruptByName("NMI");
this.vbiTimer = new Stopwatch();
this.paletteMemory = new byte[0x20];
this.primaryOam = new byte[0x100];
this.secondaryOam = new byte[0x20];
// PPU registers on CPU bus
cpuBus.RegisterMappedDevice(this, 0x2000, 0x2007);
// Palette data
ppuBus.RegisterMappedDevice(this, 0x3F00, 0x3F1F);
// Set up power-on state
this.SetPpuCtrl(0x00);
this.SetPpuMask(0x00);
this.SetOamAddr(0x00);
this.spriteZeroHit = false;
this.spriteOverflow = false;
this.isVBlank = false;
this.oddFrame = false;
this.scanline = -1;
this.cycle = 0;
this.registers = new ReadOnlyCollection <IRegister>(
new IRegister[] {
new RegisterWrapper("scanline", "PPU Scanline", 16, () => this.scanline, s => this.scanline = s),
new RegisterWrapper("cycle", "PPU Cycle", 16, () => this.cycle, c => this.cycle = c)
});
//this.vbiTimer.Start();
}
public static IProcessorInterrupt GetInterruptByName(this IProcessorCore cpu, string interruptName)
{
return(cpu.Interrupts.FirstOrDefault(i => String.Equals(i.Name, interruptName, StringComparison.Ordinal)));
}