private void ParseOpcodes(CancellationToken token)
{
this.lastCycleTime = DateTime.Now;
while (!token.IsCancellationRequested)
{
switch (input.ProcessInput())
{
case KeypadKey.Pause:
{
this.isPaused = !isPaused;
this.Paused?.Invoke(this.isPaused);
break;
}
case KeypadKey.Stop:
{
return;
}
case KeypadKey.Restart:
Cls(0);
programCounter = ExecutionStartAddress;
break;
case KeypadKey.DelayPlus:
currentCycleDelay += CycleDelayStep;
DelayChanged?.Invoke(currentCycleDelay);
break;
case KeypadKey.DelayMinus:
currentCycleDelay -= CycleDelayStep;
currentCycleDelay = currentCycleDelay < DelayLowerBounds ? DelayLowerBounds : currentCycleDelay;
DelayChanged?.Invoke(currentCycleDelay);
break;
}
var currentTime = DateTime.Now;
float dt = (currentTime - this.lastCycleTime).Ticks;
if (!isPaused && dt > currentCycleDelay)
{
this.lastCycleTime = currentTime;
}
else
{
continue;
}
byte b1 = memory[programCounter];
byte b2 = memory[programCounter + 1];
programCounter += 2;
var firstDigit = b1 >> 4;
Instructions[firstDigit]((b1 << 8) | b2);
if (soundTimer > 0)
{
soundTimer--;
}
if (delayTimer > 0)
{
delayTimer--;
}
}
}
/// <summary>
/// Raises the <see cref="DelayChanged" /> event.
/// </summary>
/// <seealso cref="EventArgs" />
protected virtual void OnDelayChanged()
{
DelayChanged?.Invoke(this, EventArgs.Empty);
}
