From 2e3102879b2d3059f4ce0efc1a0ecd4bc3142a99 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Wed, 28 Dec 2011 00:11:12 +0000
Subject: Added some more base classes and started on the Z80 implementation.

---
 Noddybox.Emulation.EightBit/ICpu.cs                | 54 ++++++++++++++++++++++
 Noddybox.Emulation.EightBit/IDevice.cs             |  4 +-
 Noddybox.Emulation.EightBit/IMemory.cs             |  4 +-
 Noddybox.Emulation.EightBit/IRegister16.cs         | 34 ++++++++++++++
 .../Noddybox.Emulation.EightBit.csproj             | 11 +++++
 Noddybox.Emulation.EightBit/Register16BigEndian.cs | 53 +++++++++++++++++++++
 Noddybox.Emulation.EightBit/Register16Factory.cs   | 31 +++++++++++++
 .../Register16LittleEndian.cs                      | 53 +++++++++++++++++++++
 8 files changed, 240 insertions(+), 4 deletions(-)
 create mode 100644 Noddybox.Emulation.EightBit/ICpu.cs
 create mode 100644 Noddybox.Emulation.EightBit/IRegister16.cs
 create mode 100644 Noddybox.Emulation.EightBit/Register16BigEndian.cs
 create mode 100644 Noddybox.Emulation.EightBit/Register16Factory.cs
 create mode 100644 Noddybox.Emulation.EightBit/Register16LittleEndian.cs

(limited to 'Noddybox.Emulation.EightBit')

diff --git a/Noddybox.Emulation.EightBit/ICpu.cs b/Noddybox.Emulation.EightBit/ICpu.cs
new file mode 100644
index 0000000..139933d
--- /dev/null
+++ b/Noddybox.Emulation.EightBit/ICpu.cs
@@ -0,0 +1,54 @@
+using System;
+using System.Net;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Shapes;
+
+namespace Noddybox.Emulation.EightBit
+{
+    /// <summary>
+    /// Defines an 8-bit CPU.
+    /// </summary>
+    public interface ICpu
+    {
+        /// <summary>
+        /// Initialise the CPU to give it access to memory and devices.
+        /// </summary>
+        /// <param name="memory">The memory to access.</param>
+        /// <param name="device">The devices to access.</param>
+        /// <param name="clock">The clock to use.</param>
+        void Initialise(IMemory memory, IDevice device, Clock clock);
+
+        /// <summary>
+        /// Resets the CPU to its initial state.
+        /// </summary>
+        void Reset();
+
+        /// <summary>
+        /// Runs the next instruction.
+        /// </summary>
+        void Step();
+
+        /// <summary>
+        /// Runs the CPU until the next frame flyback.
+        /// </summary>
+        void Run();
+
+        /// <summary>
+        /// Generates a maskable interrupt to the CPU.
+        /// </summary>
+        /// <param name="value">Optional value from an interrupting device.  May be ignored depending on the CPU type.</param>
+        void MaskableInterrupt(byte value);
+
+        /// <summary>
+        /// Generates a non-maskable interrupt to the CPU.
+        /// </summary>
+        /// <param name="value">Optional value from an interrupting device.  May be ignored depending on the CPU type.</param>
+        void NonMaskableInterrupt(byte value);
+    }
+}
diff --git a/Noddybox.Emulation.EightBit/IDevice.cs b/Noddybox.Emulation.EightBit/IDevice.cs
index 108adf9..00ef38d 100644
--- a/Noddybox.Emulation.EightBit/IDevice.cs
+++ b/Noddybox.Emulation.EightBit/IDevice.cs
@@ -22,13 +22,13 @@ namespace Noddybox.Emulation.EightBit
         /// </summary>
         /// <param name="device">The address of the device.</param>
         /// <returns>The byte returned from the device.</returns>
-        byte Read(UInt16 device);
+        byte Read(ushort device);
 
         /// <summary>
         /// Write to a device.
         /// </summary>
         /// <param name="device">The address of the device.</param>
         /// <param name="value">The value to write to the device.</param>
-        void Write(UInt16 device, byte value);
+        void Write(ushort device, byte value);
     }
 }
diff --git a/Noddybox.Emulation.EightBit/IMemory.cs b/Noddybox.Emulation.EightBit/IMemory.cs
index 5131eb0..2c842a5 100644
--- a/Noddybox.Emulation.EightBit/IMemory.cs
+++ b/Noddybox.Emulation.EightBit/IMemory.cs
@@ -21,13 +21,13 @@ namespace Noddybox.Emulation.EightBit
         /// </summary>
         /// <param name="address">The address to read.</param>
         /// <returns>The value at that address.</returns>
-        byte Read(UInt16 address); 
+        byte Read(ushort address); 
 
         /// <summary>
         /// Writes a byte at a given address.
         /// </summary>
         /// <param name="address">The address to write to.</param>
         /// <param name="value">The value to write.</param>
-        void Write(UInt16 address, byte value);
+        void Write(ushort address, byte value);
     }
 }
diff --git a/Noddybox.Emulation.EightBit/IRegister16.cs b/Noddybox.Emulation.EightBit/IRegister16.cs
new file mode 100644
index 0000000..e3bfc69
--- /dev/null
+++ b/Noddybox.Emulation.EightBit/IRegister16.cs
@@ -0,0 +1,34 @@
+using System;
+using System.Net;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Shapes;
+
+namespace Noddybox.Emulation.EightBit
+{
+    /// <summary>
+    /// Provides a common 8-bit register pattern, which is two 8-bit registers rolled into one.
+    /// </summary>
+    public interface IRegister16
+    {
+        /// <summary>
+        /// Get/set the low byte of the 16-bit register.
+        /// </summary>
+        byte Low {get; set;}
+
+        /// <summary>
+        /// Get/set the high byte of the 16-bit register.
+        /// </summary>
+        byte High {get; set;}
+
+        /// <summary>
+        /// Get/set the value of the 16-bit register.
+        /// </summary>
+        ushort Value {get; set;}
+    }
+}
diff --git a/Noddybox.Emulation.EightBit/Noddybox.Emulation.EightBit.csproj b/Noddybox.Emulation.EightBit/Noddybox.Emulation.EightBit.csproj
index 316b00b..c7d5924 100644
--- a/Noddybox.Emulation.EightBit/Noddybox.Emulation.EightBit.csproj
+++ b/Noddybox.Emulation.EightBit/Noddybox.Emulation.EightBit.csproj
@@ -49,9 +49,20 @@
     <Reference Include="mscorlib.extensions" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="ICpu.cs" />
     <Compile Include="IDevice.cs" />
     <Compile Include="IMemory.cs" />
+    <Compile Include="IRegister16.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Register16BigEndian.cs" />
+    <Compile Include="Register16Factory.cs" />
+    <Compile Include="Register16LittleEndian.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Noddybox.Emulation\Noddybox.Emulation.csproj">
+      <Project>{A2478066-4DFD-4042-BF98-963922DC97F8}</Project>
+      <Name>Noddybox.Emulation</Name>
+    </ProjectReference>
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Microsoft\Silverlight for Phone\$(TargetFrameworkVersion)\Microsoft.Silverlight.$(TargetFrameworkProfile).Overrides.targets" />
   <Import Project="$(MSBuildExtensionsPath)\Microsoft\Silverlight for Phone\$(TargetFrameworkVersion)\Microsoft.Silverlight.CSharp.targets" />
diff --git a/Noddybox.Emulation.EightBit/Register16BigEndian.cs b/Noddybox.Emulation.EightBit/Register16BigEndian.cs
new file mode 100644
index 0000000..8378543
--- /dev/null
+++ b/Noddybox.Emulation.EightBit/Register16BigEndian.cs
@@ -0,0 +1,53 @@
+using System;
+using System.Net;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Shapes;
+using System.Runtime.InteropServices;
+
+namespace Noddybox.Emulation.EightBit
+{
+    [StructLayout(LayoutKind.Explicit)]
+    public struct Register16BigEndian : IRegister16
+    {
+        #region Register fields
+
+        [FieldOffset(0)]
+        ushort reg;
+
+        [FieldOffset(1)]
+        byte low;
+
+        [FieldOffset(0)]
+        byte high;
+
+        #endregion
+
+        #region IRegister16 Members
+
+        public byte Low
+        {
+            get {return low;}
+            set {low = value;}
+        }
+
+        public byte High
+        {
+            get {return high;}
+            set {high = value;}
+        }
+
+        public ushort Value
+        {
+            get {return reg;}
+            set {reg = value;}
+        }
+
+        #endregion
+    }
+}
diff --git a/Noddybox.Emulation.EightBit/Register16Factory.cs b/Noddybox.Emulation.EightBit/Register16Factory.cs
new file mode 100644
index 0000000..fd31fe4
--- /dev/null
+++ b/Noddybox.Emulation.EightBit/Register16Factory.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Net;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Shapes;
+
+namespace Noddybox.Emulation.EightBit
+{
+    /// <summary>
+    /// Defines a common 16-bit register, which is two bytes which are separately addressable.
+    /// </summary>
+    public static class Register16Factory
+    {
+        public static IRegister16 Create()
+        {
+            if (BitConverter.IsLittleEndian)
+            {
+                return new Register16LittleEndian();
+            }
+            else
+            {
+                return new Register16BigEndian();
+            }
+        }
+    }
+}
diff --git a/Noddybox.Emulation.EightBit/Register16LittleEndian.cs b/Noddybox.Emulation.EightBit/Register16LittleEndian.cs
new file mode 100644
index 0000000..a2cf8a8
--- /dev/null
+++ b/Noddybox.Emulation.EightBit/Register16LittleEndian.cs
@@ -0,0 +1,53 @@
+using System;
+using System.Net;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Shapes;
+using System.Runtime.InteropServices;
+
+namespace Noddybox.Emulation.EightBit
+{
+    [StructLayout(LayoutKind.Explicit)]
+    public struct Register16LittleEndian : IRegister16
+    {
+        #region Register fields
+
+        [FieldOffset(0)]
+        ushort reg;
+
+        [FieldOffset(0)]
+        byte low;
+
+        [FieldOffset(1)]
+        byte high;
+
+        #endregion
+
+        #region IRegister16 Members
+
+        public byte Low
+        {
+            get {return low;}
+            set {low = value;}
+        }
+
+        public byte High
+        {
+            get {return high;}
+            set {high = value;}
+        }
+
+        public ushort Value
+        {
+            get {return reg;}
+            set {reg = value;}
+        }
+
+        #endregion
+    }
+}
-- 
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