/// <summary>
/// Initializes a new instance of the <see cref="TimerRegisters"/> class.
/// </summary>
/// <param name="timerControlRegister">The timer control register.</param>
/// <param name="interruptFlagsRegister">The interrupt flags register.</param>
/// <param name="instructionTimer">The instruction timer.</param>
public TimerRegisters(ITimerControlRegister timerControlRegister, IInterruptFlagsRegister interruptFlagsRegister, IInstructionTimer instructionTimer)
{
TimerControlRegister = timerControlRegister;
_interruptFlagsRegister = interruptFlagsRegister;
TimerModuloRegister = new SimpleRegister(0xff06, "Timer Modulo (TMA R/W)");
TimerCounterRegister = new SimpleRegister(0xff05, "Timer counter (TIMA R/W)");
instructionTimer.TimingSync += timings =>
{
if (!TimerControlRegister.TimerEnabled)
{
return;
}
_cyclesSinceLastIncrement += timings.MachineCycles;
if (_cyclesSinceLastIncrement > TimerControlRegister.TimerFrequency)
{
if (TimerCounterRegister.Register == 0xff)
{
// Overflow.
TimerCounterRegister.Register = TimerModuloRegister.Register;
_interruptFlagsRegister.UpdateInterrupts(InterruptFlag.TimerOverflow);
}
else
{
TimerCounterRegister.Register++;
}
}
_cyclesSinceLastIncrement -= TimerControlRegister.TimerFrequency;
};
}
/// <summary>
/// Initializes a new instance of the <see cref="GpuRegisters"/> class.
/// </summary>
/// <param name="lcdControlRegister">The LCD control register.</param>
/// <param name="currentScanlineRegister">The current scanline register.</param>
/// <param name="lcdMonochromePaletteRegister">The LCD monochrome palette register.</param>
/// <param name="lcdStatusRegister">The LCD status register.</param>
/// <param name="interruptFlagsRegister">The interrupt flags register.</param>
public GpuRegisters(ILcdControlRegister lcdControlRegister,
ICurrentScanlineRegister currentScanlineRegister,
ILcdMonochromePaletteRegister lcdMonochromePaletteRegister,
ILcdStatusRegister lcdStatusRegister,
IInterruptFlagsRegister interruptFlagsRegister)
{
LcdStatusRegister = lcdStatusRegister;
_interruptFlagsRegister = interruptFlagsRegister;
LcdControlRegister = lcdControlRegister;
CurrentScanlineRegister = currentScanlineRegister;
LcdMonochromePaletteRegister = lcdMonochromePaletteRegister;
ScrollXRegister = new SimpleRegister(0xff43, "Background Horizontal Scrolling (SCROLLX R/W)");
ScrollYRegister = new SimpleRegister(0xff42, "Background Vertical Scrolling (SCROLLY R/W)");
CurrentScanlineCompareRegister = new SimpleRegister(0xff45, "LY Compare (LYC R/W)");
WindowYPositionRegister = new SimpleRegister(0xff4a, "Window Y Position (WY R/W)");
WindowXPositionRegister = new SimpleRegister(0xff4b, "Window X Position minus 7 (WX R/W)");
}
protected SerialPortBase()
{
SerialData = new SimpleRegister(0xff01, "Serial data (SIODATA R/W)");
}
