public void Tick()
{
UpdateDiv((_div + 1) & 0xffff);
if (!_overflow)
{
return;
}
_ticksSinceOverflow++;
if (_ticksSinceOverflow == 4)
{
_interruptManager.RequestInterrupt(InterruptManager.InterruptType.Timer);
}
if (_ticksSinceOverflow == 5)
{
_tima = _tma;
}
if (_ticksSinceOverflow == 6)
{
_tima = _tma;
_overflow = false;
_ticksSinceOverflow = 0;
}
}
public void OnButtonPress(Button button)
{
if (button != null)
{
_interruptManager.RequestInterrupt(InterruptManager.InterruptType.P1013);
_buttons.TryAdd(button, button);
}
}
public void UpdateInput(KeyState ks)
{
int diff1 =
(keyState.buttonState ^ ks.buttonState) & ks.buttonState |
((keyState.dpadState ^ ks.dpadState) & ks.dpadState);
if (diff1 != 0)
{
interruptManager.RequestInterrupt(InterruptType.Joypad);
}
keyState.buttonState = ks.buttonState;
keyState.dpadState = ks.dpadState;
}
private void OnLYLineChange()
{
if (LCDEnabled)
{
if (LY < LCDHeight)
{
ReconstructOAMTable();
if (Mode2_OAMInterruptEnabled)
{
interruptManager.RequestInterrupt(InterruptType.LCDC);
}
else
{
LYCoincidenceCheck();
}
}
else if (LY == LCDHeight)
{
interruptManager.RequestInterrupt(InterruptType.VBlank);
GlobalTimer.GetInstance().ResetEventCounter();
if (Mode1_VBlankInterruptEnabled)
{
interruptManager.RequestInterrupt(InterruptType.LCDC);
}
else
{
LYCoincidenceCheck();
}
}
else
{
LYCoincidenceCheck();
}
}
}
public override void UpdateTime(int cycles)
{
CycleCounter += cycles;
if (CycleCounter >= DMG_ClockRate)
{
CycleCounter -= DMG_ClockRate;
}
if (TAC_TimerEnabled)
{
TAC_TimerCycles += cycles;
while (TAC_TimerCycles >= TAC_Timings[TAC_ClockIndex])
{
TAC_TimerCycles -= TAC_Timings[TAC_ClockIndex];
TIMA_TimerCounter++;
if (TIMA_TimerCounter == 0)
{
interruptManager.RequestInterrupt(InterruptType.Timer);
TIMA_TimerCounter = TMA_TimerOverflowValue;
}
}
}
}
public void Tick()
{
if (!_transferInProgress)
{
return;
}
if (++_divider >= Gameboy.TicksPerSec / 8192 / _speedMode.GetSpeedMode())
{
_transferInProgress = false;
try
{
_sb = _serialEndpoint.transfer(_sb);
}
catch (IOException e)
{
Debug.WriteLine($"Can't transfer byte {e}");
_sb = 0;
}
_interruptManager.RequestInterrupt(InterruptManager.InterruptType.Serial);
}
}
public Mode?Tick()
{
if (!_lcdEnabled)
{
if (_lcdEnabledDelay != -1)
{
if (--_lcdEnabledDelay == 0)
{
_display.Enabled = true;
_lcdEnabled = true;
}
}
}
if (!_lcdEnabled)
{
return(null);
}
var oldMode = _mode;
_ticksInLine++;
if (_phase.Tick())
{
// switch line 153 to 0
if (_ticksInLine == 4 && _mode == Mode.VBlank && _r.Get(GpuRegister.Ly) == 153)
{
_r.Put(GpuRegister.Ly, 0);
RequestLycEqualsLyInterrupt();
}
}
else
{
switch (oldMode)
{
case Mode.OamSearch:
_mode = Mode.PixelTransfer;
_phase = _pixelTransferPhase.Start(_oamSearchPhase.GetSprites());
break;
case Mode.PixelTransfer:
_mode = Mode.HBlank;
_phase = _hBlankPhase.Start(_ticksInLine);
RequestLcdcInterrupt(3);
break;
case Mode.HBlank:
_ticksInLine = 0;
if (_r.PreIncrement(GpuRegister.Ly) == 144)
{
_mode = Mode.VBlank;
_phase = _vBlankPhase.Start();
_interruptManager.RequestInterrupt(InterruptManager.InterruptType.VBlank);
RequestLcdcInterrupt(4);
}
else
{
_mode = Mode.OamSearch;
_phase = _oamSearchPhase.Start();
}
RequestLcdcInterrupt(5);
RequestLycEqualsLyInterrupt();
break;
case Mode.VBlank:
_ticksInLine = 0;
if (_r.PreIncrement(GpuRegister.Ly) == 1)
{
_mode = Mode.OamSearch;
_r.Put(GpuRegister.Ly, 0);
_phase = _oamSearchPhase.Start();
RequestLcdcInterrupt(5);
}
else
{
_phase = _vBlankPhase.Start();
}
RequestLycEqualsLyInterrupt();
break;
}
}
if (oldMode == _mode)
{
return(null);
}
return(_mode);
}
