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Processor.cs
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Processor.cs
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using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using Windows.UI.Xaml;
namespace PIC_Simulator
{
class Processor : INotifyPropertyChanged
{
private ISourcecodeViewInterface ViewInterface;
internal Collection<ProcessorInstruction> ProgramMemory = new Collection<ProcessorInstruction>();
internal MemoryController memController;
internal ObservableStack<ushort> Stack = new ObservableStack<ushort>();
private byte wreg;
internal byte Wreg { get { return wreg; } set { wreg = value; this.OnPropertyChanged(); } }
private bool twoCycles;
private bool _isSleeping;
private ushort timerPrescalerCounter = 0;
private short timer_waitcycles = 0;
// Häufig genutzte GPR Adressen
internal static ushort PORTA = 0x05;
internal static ushort PORTB = 0x06;
internal static ushort INTCON = 0x0B;
internal static ushort OPTION_REG = 0x81;
// Temporäre Werte der PORTA bzw. INTCON Register
private byte tmpPORTA, tmpINTCON;
// Watchdog timer Zählvariable, zählt die vergangenen Ticks
internal long Watchdog = 0;
/// <summary>
/// Der interne Takt für (!)µC-Zyklen
/// Beachten: f_PIC = f_Quarz / 4, also 4 Quarz Schwingungen
/// ergeben einen µC-Takt
/// </summary>
public DispatcherTimer Clock = new DispatcherTimer();
public event PropertyChangedEventHandler PropertyChanged = delegate { };
private void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
#region Steuerlogik
public Processor(ISourcecodeViewInterface viewInterface)
{
this.ViewInterface = viewInterface;
Clock.Tick += Clock_Tick;
this.Clock.Interval = new TimeSpan(20); // 20 Ticks ^= 2000 ns ^= 2MHz Quarzfrequenz
this.memController = new MemoryController(this.EnableWaitCycles);
this.twoCycles = false;
tmpPORTA = tmpINTCON = 0;
}
/// <summary>
/// Methode die den aktuellen OpCode zurückgibt
/// </summary>
/// <returns></returns>
private ushort GetOpcode()
{
ushort pc = this.memController.PC;
return this.ProgramMemory[pc].Opcode;
}
private void Clock_Tick(object sender, object e)
{
if (this.ProgramMemory[this.memController.PC].IsBreakpoint)
{
this.Clock.Stop();
this.ViewInterface.SetIsProgrammRunning(false);
return;
}
this.Step();
}
/// <summary>
/// Methode um einen Opcode einzulesen und auszuführen
/// </summary>
public void Step()
{
if (Interrupt()) return;
this.ViewInterface.IncreaseStopwatch(this.Clock.Interval);
if (WatchdogTick())
{
ViewInterface.SetCurrentSourcecodeLine(this.ProgramMemory[memController.PC].LineNumber - 1);
return;
}
if (this._isSleeping) return;
Tmr0Tick();
this.Decode();
if (this.twoCycles)
{
this.ViewInterface.IncreaseStopwatch(this.Clock.Interval);
WatchdogTick();
Tmr0Tick();
this.twoCycles = false;
}
tmpINTCON = this.memController.GetFile(INTCON);
tmpPORTA = this.memController.GetFile(PORTA);
ViewInterface.SetCurrentSourcecodeLine(this.ProgramMemory[memController.PC].LineNumber - 1);
}
/// <summary>
/// Methode um Watchdog Timer zu erhöhen
/// </summary>
private bool WatchdogTick()
{
this.Watchdog += this.Clock.Interval.Ticks;
ushort PostscalerRateSelect = (ushort)(this.memController.GetFile(0x81) & 0x07);
int PostscalerRatio = 1;
ushort psa = (this.memController.GetBit(0x81, 3));
if (psa == 1) PostscalerRatio = (ushort)(1 << (PostscalerRateSelect)); // = 2 ^ PrescalerRateSelect
long BaseTicks = 180000; // 18ms
#if DEBUG_WDT
BaseTicks = 1800; // damit's beim debuggen schneller geht ;)
#endif
if (this.Watchdog >= (BaseTicks * PostscalerRatio))
{
if (this._isSleeping)
{
this._isSleeping = false;
this.Watchdog = 0;
this.memController.PC++;
}
else
{
this.Reset();
this.memController.ClearBit(0x03, 4); // PD bit
}
return true;
}
return false;
}
/// <summary>
/// Methode um den PIC zurückzusetzen
/// </summary>
internal void Reset()
{
// Memory auf Standardwerte zurücksetzen
this.memController.ClearMemory();
// Stack zurücksetzen
this.Stack.Clear();
// Spezielle Variablen zurücksetzen
this.memController.PC = 0;
this.Wreg = 0;
this.Watchdog = 0;
this._isSleeping = false;
// Stopwatch zurücksetzen und erste Zeile highlighten
ViewInterface.ResetStopwatch();
ViewInterface.SetCurrentSourcecodeLine(this.ProgramMemory[0].LineNumber - 1);
}
/// <summary>
/// Methode um den Timer0 ticken zu lassen
/// </summary>
private void Tmr0Tick()
{
// Prescaler holen
ushort PrescalerRateSelect = (ushort)(this.memController.GetFile(0x81) & 0x07);
ushort PrescalerRatio = (ushort)(1 << (PrescalerRateSelect + 1)); // = 2 ^ (PrescalerRateSelect + 1)
ushort psa = (ushort)(this.memController.GetBit(0x81, 3));
if (this.memController.GetBit(OPTION_REG, 5) == 0)
{
// Timer Modus wenn T0CS clear
if (timer_waitcycles <= 0 && ((psa == 0 && this.timerPrescalerCounter >= PrescalerRatio) || !(psa == 0)))
{
if (psa == 0) this.timerPrescalerCounter = 0;
IncTimer();
}
else if (timer_waitcycles > 0)
{
timer_waitcycles--;
}
this.timerPrescalerCounter++;
}
else
{
// Counter Modus wenn T0CS gesetzt
if (this.memController.GetBit(OPTION_REG, 4) == 0)
{
// Counter schaltet bei rising edge
if (((tmpPORTA & 0x10) == 0) && (this.memController.GetBit(PORTA, 4) == 1))
{
if (this.timerPrescalerCounter >= PrescalerRatio)
{
IncTimer();
this.timerPrescalerCounter = 0;
}
tmpPORTA = this.memController.GetFile(PORTA);
this.timerPrescalerCounter++;
}
}
else
{
// Counter schaltet bei falling edge
if (((tmpPORTA & 0x10) > 0) && (this.memController.GetBit(PORTA, 4) == 0))
{
if (this.timerPrescalerCounter >= PrescalerRatio)
{
IncTimer();
this.timerPrescalerCounter = 0;
}
tmpPORTA = this.memController.GetFile(PORTA);
this.timerPrescalerCounter++;
}
}
}
}
/// <summary>
/// Methode um den Timer zu erhöhen
/// </summary>
private void IncTimer()
{
byte timer = this.memController.GetFile(0x01);
timer++;
this.memController.SetTimer(timer);
if (timer == 0)
{
// Overflow des Timers -> Interrupt auslösen (T0IF)
this.memController.SetBit(INTCON, 2);
}
}
/// <summary>
/// Methode um auf Interrupts zu prüfen und diese zu behandlen
/// </summary>
/// <returns>Liegt ein Interrupt vor</returns>
private bool Interrupt()
{
if (CheckForInterrupts())
{
// Aktuellen PC auf Stack pushen
this.Stack.Push(this.memController.PC);
// GIE löschen
this.memController.ClearBit(INTCON, 7);
// Bei Interrupt wird an Stelle 0x04 gesprungen
this.memController.PC = 0x04;
ViewInterface.SetCurrentSourcecodeLine(this.ProgramMemory[memController.PC].LineNumber - 1);
return true;
}
return false;
}
/// <summary>
/// Methode, die prüft, ob interrupts vorliegen
/// </summary>
/// <returns>Liegt ein Interrupt vor</returns>
private bool CheckForInterrupts()
{
// Testen ob GIE Bit gesetzt ist (ansonsten nicht auf Interrupts prüfen)
if (this.memController.GetBit(INTCON, 7) == 1)
{
// RB Port Change
if (this.memController.GetBit(INTCON, 3) == 1 && this.memController.GetBit(INTCON, 0) == 1) return true;
// RB0 / INT
if (this.memController.GetBit(INTCON, 4) == 1 && this.memController.GetBit(INTCON, 1) == 1) return true;
// TMR0 overflow
if (this.memController.GetBit(INTCON, 5) == 1 && this.memController.GetBit(INTCON, 2) == 1) return true;
// EE Write Complete
if (this.memController.GetBit(INTCON, 6) == 1 && this.memController.GetBit(0x88, 4) == 1) return true;
}
return false;
}
/// <summary>
/// Methode um Timer-Waitcycles zu aktivieren
/// </summary>
private void EnableWaitCycles()
{
this.timer_waitcycles = 2;
}
private void handleZeroFlag(ushort value)
{
// Z-Flag handling
if (value == 0)
this.memController.SetZeroFlag();
else
this.memController.ClearZeroFlag();
}
/// <summary>
/// Diese Routine dekodiert den aktuellen Befehl und ruft die entsprechende
/// Subroutine zur Ausführung des Maschinenbefehls auf.
/// Zur Dekodierung werden die pro Maschinenbefehl ausschlaggebenden Bits maskiert
/// und gemäß Datenblatt auf ihren Wert geprüft.
/// </summary>
private void Decode()
{
ushort opcode = this.GetOpcode();
if ((opcode & 0xFF00) == 0x0700)
this.addwf();
if ((opcode & 0xFF00) == 0x0500)
this.andwf();
if ((opcode & 0xFF80) == 0x0180)
this.clrf();
if ((opcode & 0xFF80) == 0x0100)
this.clrw();
if ((opcode & 0xFF00) == 0x0900)
this.comf();
if ((opcode & 0xFF00) == 0x0300)
this.decf();
if ((opcode & 0xFF00) == 0x0B00)
this.decfsz();
if ((opcode & 0xFF00) == 0x0A00)
this.incf();
if ((opcode & 0xFF00) == 0x0F00)
this.incfsz();
if ((opcode & 0xFF00) == 0x0400)
this.iorwf();
if ((opcode & 0xFF00) == 0x0800)
this.movf();
if ((opcode & 0xFF80) == 0x0080)
this.movwf();
if ((opcode & 0xFF9F) == 0x0000)
this.memController.PC++;
if ((opcode & 0xFF00) == 0x0D00)
this.rlf();
if ((opcode & 0xFF00) == 0x0C00)
this.rrf();
if ((opcode & 0xFF00) == 0x0200)
this.subwf();
if ((opcode & 0xFF00) == 0x0E00)
this.swapf();
if ((opcode & 0xFF00) == 0x0600)
this.xorwf();
//---
if ((opcode & 0xFC00) == 0x1000)
this.bcf();
if ((opcode & 0xFC00) == 0x1400)
this.bsf();
if ((opcode & 0xFC00) == 0x1800)
this.btfsc();
if ((opcode & 0xFC00) == 0x1C00)
this.btfss();
//---
if ((opcode & 0xFE00) == 0x3E00)
this.addlw();
if ((opcode & 0xFF00) == 0x3900)
this.andlw();
if ((opcode & 0xF800) == 0x2000)
this.call();
if ((opcode & 0xFFFF) == 0x0064)
this.clrwdt();
if ((opcode & 0xF800) == 0x2800)
this.goto_f();
if ((opcode & 0xFF00) == 0x3800)
this.iorlw();
if ((opcode & 0xFC00) == 0x3000)
this.movlw();
if ((opcode & 0xFFFF) == 0x0009)
this.retfie();
if ((opcode & 0xFC00) == 0x3400)
this.retlw();
if ((opcode & 0xFFFF) == 0x0008)
this.return_f();
if ((opcode & 0xFFFF) == 0x0063)
this.sleep();
if ((opcode & 0xFF00) == 0x3C00)
this.sublw();
if ((opcode & 0xFF00) == 0x3A00)
this.xorlw();
}
#endregion
#region Maschinenbefehle
#pragma warning disable IDE1006 // Benennungsstile (Namen müssen mit Großbuchstaben anfangen)
private void addwf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
ushort value = (ushort)this.memController.GetFile(address);
ushort result = (ushort)(this.Wreg + value);
// DC-Flag handling
if (((value & 0x0F) + (this.Wreg & 0x0F)) > 15)
this.memController.SetBit(0x03, 1);
else
this.memController.ClearBit(0x03, 1);
// C-Flag handling
if ((result & 0xFF00) > 0)
this.memController.SetBit(0x03, 0);
else
this.memController.ClearBit(0x03, 0);
// Z-Flag handling
handleZeroFlag(result);
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, (byte)result);
else
this.Wreg = (byte)result;
this.memController.PC++;
}
private void andwf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte value = this.memController.GetFile(address);
byte result = (byte)(this.Wreg & value);
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, result);
else
this.Wreg = result;
// Z-Flag handling
handleZeroFlag(result);
this.memController.PC++;
}
private void clrf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
this.memController.SetFile(address, 0);
this.memController.SetZeroFlag();
this.memController.PC++;
}
private void clrw()
{
this.Wreg = 0;
this.memController.SetZeroFlag();
this.memController.PC++;
}
private void comf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte value = this.memController.GetFile(address);
byte result = (byte)(~value);
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, result);
else
this.Wreg = result;
// Z-Flag handling
handleZeroFlag(result);
this.memController.PC++;
}
private void decf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte value = this.memController.GetFile(address);
value--;
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, value);
else
this.Wreg = value;
// Z-Flag handling
handleZeroFlag(value);
this.memController.PC++;
}
private void decfsz()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte value = this.memController.GetFile(address);
value--;
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, value);
else
this.Wreg = value;
if (value == 0)
{
this.twoCycles = true;
this.memController.PC++;
}
this.memController.PC++;
}
private void incf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte value = this.memController.GetFile(address);
byte result = (byte)(value + 1);
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, result);
else
this.Wreg = result;
// Z-Flag handling
handleZeroFlag(result);
this.memController.PC++;
}
private void incfsz()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte value = this.memController.GetFile(address);
byte result = (byte)(value + 1);
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, result);
else
this.Wreg = result;
if (result == 0)
{
this.twoCycles = true;
this.memController.PC++; //Programmcounter hochzaehlen, um naechsten Befehl zu ueberspringen
}
this.memController.PC++;
}
private void iorwf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte value = this.memController.GetFile(address);
byte result = (byte)(value | this.Wreg);
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, result);
else
this.Wreg = result;
// Z-Flag handling
handleZeroFlag(result);
this.memController.PC++;
}
private void movf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
bool destination = ((this.GetOpcode() & 0x0080) == 0x0080);
byte value = this.memController.GetFile(address);
// if d == 0, value von f in w-register schreiben,
// andernfalls f in f schreiben (redundant)
if (!destination)
this.Wreg = value;
// Z-Flag handling
handleZeroFlag(value);
this.memController.PC++;
}
private void movwf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
this.memController.SetFile(address, this.Wreg);
this.memController.PC++;
}
private void rlf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
ushort value = (ushort)this.memController.GetFile(address);
value = (ushort)(value << 1);
byte carry = this.memController.GetBit(0x03, 0);
byte newCarry = (byte)((value & 0x0100) >> 8);
byte newValue = (byte)(value + carry);
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, newValue);
else
this.Wreg = newValue;
// C-Flag handling
if (newCarry == 1)
this.memController.SetBit(0x03, 0);
else
this.memController.ClearBit(0x03, 0);
this.memController.PC++;
}
private void rrf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte value = this.memController.GetFile(address);
byte carry = this.memController.GetBit(0x03, 0);
byte newCarry = (byte)(value & 0x01);
value = (byte)((value >> 1) + (carry << 7));
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, value);
else
this.Wreg = value;
// C-Flag handling
if (newCarry == 1)
this.memController.SetBit(0x03, 0);
else
this.memController.ClearBit(0x03, 0);
this.memController.PC++;
}
private void subwf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte value = (byte)(this.memController.GetFile(address));
byte result = (byte)(value - this.Wreg);
// C-Flag handling
if (this.Wreg > value)
this.memController.ClearBit(0x03, 0);
else
this.memController.SetBit(0x03, 0);
// DC-Flag handling
if ((this.Wreg & 0x0F) > (value & 0x0F))
this.memController.ClearBit(0x03, 1);
else
this.memController.SetBit(0x03, 1);
// Z-Flag handling
handleZeroFlag(result);
// In W-reg oder file
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, result);
else
this.Wreg = result;
this.memController.PC++;
}
private void swapf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte value = this.memController.GetFile(address);
byte lowerNibbles = (byte)(value & 0x0F);
byte upperNibbles = (byte)((value & 0xF0) >> 4);
value = (byte)((lowerNibbles << 4) + upperNibbles);
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, value);
else
this.Wreg = value;
this.memController.PC++;
}
private void xorwf()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte value = this.memController.GetFile(address);
byte result = (byte)(value ^ this.Wreg);
if ((this.GetOpcode() & 0x0080) > 0)
this.memController.SetFile(address, result);
else
this.Wreg = result;
this.memController.PC++;
}
private void bcf()
{
byte bit = (byte)((this.GetOpcode() & 0x0380) >> 7);
ushort address = (ushort)(this.GetOpcode() & 0x007F);
this.memController.ClearBit(address, bit);
this.memController.PC++;
}
private void bsf()
{
byte bit = (byte)((this.GetOpcode() & 0x0380) >> 7);
ushort address = (ushort)(this.GetOpcode() & 0x007F);
this.memController.SetBit(address, bit);
this.memController.PC++;
}
private void btfsc()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte bit = (byte)((this.GetOpcode() & 0x0380) >> 7);
byte result = this.memController.GetBit(address, bit);
if (result == 0)
{
this.twoCycles = true;
this.memController.PC++;
}
this.memController.PC++;
}
private void btfss()
{
ushort address = (ushort)(this.GetOpcode() & 0x007F);
byte bit = (byte)((this.GetOpcode() & 0x0380) >> 7);
byte result = this.memController.GetBit(address, bit);
if (result > 0)
{
this.twoCycles = true;
this.memController.PC++;
}
this.memController.PC++;
}
private void addlw()
{
byte literal = (byte)(this.GetOpcode() & 0x00FF);
ushort result = (ushort)(literal + this.Wreg);
//Set DC Bit
if (literal <= 0x0F && this.Wreg <= 0x0F && result >= 0x10)
this.memController.SetBit(0x03, 1);
else
this.memController.ClearBit(0x03, 1);
//Set C Bit
if ((result & 0xFF00) > 0)
this.memController.SetBit(0x03, 0);
else
this.memController.ClearBit(0x03, 0);
//Set Z Bit
handleZeroFlag(result);
this.Wreg = (byte)result;
this.memController.PC++;
}
private void andlw()
{
byte literal = (byte)(this.GetOpcode() & 0x00FF);
this.Wreg &= literal;
if (this.Wreg == 0)
this.memController.SetZeroFlag();
else
this.memController.ClearZeroFlag();
this.memController.PC++;
}
private void call()
{
this.twoCycles = true;
// Dokumentation sagt PCLATH<4:3> nach PC<12:11>
// Dadurch wird Bit 2 komplett übergangen.
ushort pclath = (ushort)(this.memController.GetFile(0x0A) & 0x18);
ushort address = (ushort)(this.GetOpcode() & 0x07FF);
this.Stack.Push((ushort)(this.memController.PC + 1));
this.memController.PC = ((ushort)(address | (pclath << 8)));
}
private void clrwdt()
{
// TO und PD Bits im Statusregister auf 1 Setzen
this.memController.SetBit(0x03, 4);
this.memController.SetBit(0x03, 3);
//WDT auf 0x00 setzen
this.Watchdog = 0;
//WDT prescaler auf 0 setzen
this.timerPrescalerCounter = 0;
this.memController.PC++;
}
private void goto_f()
{
this.twoCycles = true;
ushort pclath = (ushort)(this.memController.GetFile(0x0A) & 0x18);
ushort address = (ushort)(this.GetOpcode() & 0x07FF);
this.memController.PC = ((ushort)(address | (pclath << 8)));
}
private void iorlw()
{
byte literal = (byte)(this.GetOpcode() & 0x00FF);
this.Wreg = (byte)(literal | this.Wreg);
// Z-Flag handling
handleZeroFlag(this.Wreg);
this.memController.PC++;
}
private void movlw()
{
byte literal = (byte)(this.GetOpcode() & 0x00FF);
this.Wreg = literal;
this.memController.PC++;
}
private void retfie()
{
this.twoCycles = true;
// Set GIE bit:
this.memController.SetBit(INTCON, 7);
this.memController.PC = (this.Stack.Pop());
}
private void retlw()
{
this.twoCycles = true;
this.Wreg = (byte)(this.GetOpcode() & 0x00FF);
this.memController.PC = (this.Stack.Pop());
}
private void return_f()
{
this.twoCycles = true;
this.memController.PC = (this.Stack.Pop());
}
private void sleep()
{
// 0x00 -> WDT
this.Watchdog = 0;
// 0 -> WDT prescaler
this.timerPrescalerCounter = 0;
// Set TO (Time out bit)
this.memController.SetBit(0x03, 4);
// Clear PD (Power Down bit)
this.memController.ClearBit(0x03, 3);
this._isSleeping = true;
}
private void sublw()
{
byte literal = (byte)(this.GetOpcode() & 0x00FF);
byte result = (byte)(literal - this.Wreg);
// C-Flag handling
if (this.Wreg > literal)
this.memController.ClearBit(0x03, 0);
else
this.memController.SetBit(0x03, 0);
// DC-Flag handling
if ((this.Wreg & 0x0F) > (literal & 0x0F))
this.memController.ClearBit(0x03, 1);
else
this.memController.SetBit(0x03, 1);
// Z-Flag handling
handleZeroFlag(result);
this.Wreg = result;
this.memController.PC++;
}
private void xorlw()
{
byte literal = (byte)(this.GetOpcode() & 0x00FF);
this.Wreg = (byte)(literal ^ this.Wreg);
// Z-Flag handling
handleZeroFlag(this.Wreg);
this.memController.PC++;
}
#pragma warning restore IDE1006 // Benennungsstile
#endregion
}
interface ISourcecodeViewInterface
{
void SetCurrentSourcecodeLine(int line);
void SetIsProgrammRunning(bool value);
void IncreaseStopwatch(TimeSpan value);
void ResetStopwatch();
}
/// <summary>
/// Memorycontroller, der die Verwaltung des Speichers & EEPROMS übernimmt
/// </summary>
internal class MemoryController : INotifyPropertyChanged
{
Action EnableWaitCyclesCallback;
public event PropertyChangedEventHandler PropertyChanged = delegate { };
private void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
internal byte StatusRegister { get { return this.GetFile(0x03); } }
internal ObservableCollection<Utility.BindableByte> Memory = new ObservableCollection<Utility.BindableByte>();
internal Collection<Byte> EEPROM = new Collection<byte>();
private ushort pc = 0;
internal ushort PC
{
get
{
return this.pc;
}
set
{
byte lowerBits = (byte)(value & 0x00FF);
// PCL setzen
this.SetFile(0x02, lowerBits);
this.pc = value;
// GUI update callback
this.OnPropertyChanged("PC");
}
}
internal Collection<byte> PortA
{
get
{
Utility.BindableByte portA = this.Memory[0x05];
Collection<byte> BitVector = new Collection<byte>();
for (int i = 0; i < 5; i++)
{
if ((portA & (1 << i)) > 0)
BitVector.Add(1);
else
BitVector.Add(0);
}
return BitVector;
}
}
internal Collection<byte> PortB
{