public void Run(int instructionCount)
{
for (int i = 0; i < instructionCount; i++)
{
TestContext.Out.WriteLine($"#{i} {DebugUtils.Trace(_machine)}");
Cpu.ExecuteNextInstruction(_machine);
}
}
public void TestPrintProgram()
{
var cart = new Cartridge();
cart.LoadFromFile("../../../test_programs/print_test.rom");
var ram = new Ram();
var memoryController = new MemoryController(ram, cart);
var cpu = new Cpu(memoryController);
cpu.Init();
// Need to figure out halt...
bool done = false;
int iterations = 0;
while (!done && iterations++ < 10000)
{
cpu.ExecuteNextInstruction();
}
}
public void Step()
{
//if (State.Memory[0xFF50].GetBit(0)) // Bootrom disabled
//{
// //var nextInstr = Disassembler.DisassembleInstruction(InstructionLookahead.Passive(State));
// //_log[State.Registers.PC.Value] = nextInstr;
// //if (!_logHits.ContainsKey(State.Registers.PC.Value)) _logHits[State.Registers.PC.Value] = 0;
// //_logHits[State.Registers.PC.Value]++;
// _trace.WriteLine(DebugUtils.Trace(State));
// if (State.Registers.PC.Value == 0x00F0)
// {
// _trace.Flush();
// Environment.Exit(0);
// }
//}
if (State.Stopped)
{
// STOP mode is exited when a button is pressed.
// IF bit 4 is set when a button is pressed, so we can use that.
if (State.Memory[0xFF0F].GetBit(4))
{
State.Stopped = false;
}
else
{
return;
}
}
if (State.Halted)
{
_lcdController.Tick();
_timerController.Tick();
ElapsedCycles += 1;
}
else
{
var cycles = Cpu.ExecuteNextInstruction(State);
ElapsedCycles += cycles;
for (var i = 0; i < cycles; i++)
{
_lcdController.Tick();
_timerController.Tick();
}
}
// Handle interrupts
var firedInterrupts = (byte)(State.Memory[0xFF0F] & State.Memory[0xFFFF]);
if (State.InterruptMasterEnable && firedInterrupts != 0)
{
// Save PC
// TODO: push 16 bit values onto the stack in one call
var pc = State.Registers.PC.Value;
State.Stack.Push(pc.GetHigh());
State.Stack.Push(pc.GetLow());
State.InterruptMasterEnable = false;
//_logger.WriteLine($"Servicing interrupt ... {State.Memory[0xFF0F].ToBinaryString()} {State.Memory[0xFFFF].ToBinaryString()} {firedInterrupts.ToBinaryString()} {ElapsedCycles - _c}");
_c = ElapsedCycles;
if (firedInterrupts.GetBit(0)) // VBlank
{
State.Registers.PC.Value = 0x0040;
State.Memory[0xFF0F] = State.Memory[0xFF0F].SetBit(0, false);
}
else if (firedInterrupts.GetBit(1)) // LCD status
{
State.Registers.PC.Value = 0x0048;
State.Memory[0xFF0F] = State.Memory[0xFF0F].SetBit(1, false);
}
else if (firedInterrupts.GetBit(2)) // Timer
{
State.Registers.PC.Value = 0x0050;
State.Memory[0xFF0F] = State.Memory[0xFF0F].SetBit(2, false);
}
else if (firedInterrupts.GetBit(3)) // Serial link
{
State.Registers.PC.Value = 0x0058;
State.Memory[0xFF0F] = State.Memory[0xFF0F].SetBit(3, false);
}
else if (firedInterrupts.GetBit(4)) // Keypad press
{
State.Registers.PC.Value = 0x0060;
State.Memory[0xFF0F] = State.Memory[0xFF0F].SetBit(4, false);
}
}
// HALT mode is always exited regardless of the state of the IME
if (firedInterrupts != 0)
{
State.Halted = false;
}
}
private void Next()
{
Cpu.ExecuteNextInstruction();
}