X-Git-Url: https://mograsim.net/gitweb/?a=blobdiff_plain;f=net.mograsim.logic.core%2Fsrc%2Fnet%2Fmograsim%2Flogic%2Fcore%2Fwires%2FWire.java;h=fc7d346856deae23397e630282f488116e91dcb8;hb=2bc7d9114dc95b4a2b75c402f3ed63bf8b4a09b2;hp=bae4cb417ca4e970fb5d8f7eb1756471b4a83a25;hpb=0a7480e192f9710432f4945923cc739ec51be9b8;p=Mograsim.git

diff --git a/net.mograsim.logic.core/src/net/mograsim/logic/core/wires/Wire.java b/net.mograsim.logic.core/src/net/mograsim/logic/core/wires/Wire.java
index bae4cb41..fc7d3468 100644
--- a/net.mograsim.logic.core/src/net/mograsim/logic/core/wires/Wire.java
+++ b/net.mograsim.logic.core/src/net/mograsim/logic/core/wires/Wire.java
@@ -78,7 +78,8 @@ public class Wire
 		switch (inputs.size())
 		{
 		case 0:
-			return;
+			setNewValues(BitVector.of(Bit.U, length));
+			break;
 		case 1:
 			recalculateSingleInput();
 			break;
@@ -366,13 +367,14 @@ public class Wire
 
 	public class ReadWriteEnd extends ReadEnd
 	{
-		private boolean open;
+		private boolean open, isWriting;
 		private BitVector inputValues;
 
 		ReadWriteEnd()
 		{
 			super();
 			open = true;
+			isWriting = true;
 			initValues();
 			registerInput(this);
 		}
@@ -419,7 +421,11 @@ public class Wire
 			timeline.addEvent(e -> setValues(startingBit, bitVector), travelTime);
 		}
 
-		private void setValues(int startingBit, BitVector newValues)
+		/**
+		 * Sets the values that are being fed into the {@link Wire}. The preferred way of setting {@link ReadWriteEnd} values is via
+		 * feedValues(...) with a delay.
+		 */
+		void setValues(int startingBit, BitVector newValues)
 		{
 			// index check covered in equals
 			if (!inputValues.equalsWithOffset(newValues, startingBit))
@@ -431,7 +437,11 @@ public class Wire
 			}
 		}
 
-		private void setValues(BitVector newValues)
+		/**
+		 * Sets the values that are being fed into the {@link Wire}. The preferred way of setting {@link ReadWriteEnd} values is via
+		 * feedValues(...) with a delay.
+		 */
+		void setValues(BitVector newValues)
 		{
 			if (inputValues.equals(newValues))
 				return;
@@ -493,6 +503,31 @@ public class Wire
 		{
 			return inputValues.toString();
 		}
+
+		@Override
+		public void close()
+		{
+			super.close();
+			open = false;
+		}
+
+		void setWriting(boolean isWriting)
+		{
+			if (this.isWriting != isWriting)
+			{
+				this.isWriting = isWriting;
+				if (isWriting)
+					inputs.add(this);
+				else
+					inputs.remove(this);
+				Wire.this.recalculate();
+			}
+		}
+
+		boolean isWriting()
+		{
+			return isWriting;
+		}
 	}
 
 	@Override
@@ -509,4 +544,70 @@ public class Wire
 			inputs[i] = w[i].createReadWriteEnd();
 		return inputs;
 	}
+
+	// TODO Fix ReadWriteEnd feeding signals to entire Wire (Z) instead of only selected Bits
+	/**
+	 * Fuses the selected bits of two wires together. If the bits change in one Wire, the other is changed accordingly immediately. Warning:
+	 * The bits are permanently fused together.
+	 * 
+	 * @param a      The {@link Wire} to be (partially) fused with b
+	 * @param b      The {@link Wire} to be (partially) fused with a
+	 * @param fromA  The first bit of {@link Wire} a to be fused
+	 * @param fromB  The first bit of {@link Wire} b to be fused
+	 * @param length The amount of bits to fuse
+	 */
+	public static void fuse(Wire a, Wire b, int fromA, int fromB, int length)
+	{
+		ReadWriteEnd rA = a.createReadWriteEnd(), rB = b.createReadWriteEnd();
+		rA.setWriting(false);
+		rB.setWriting(false);
+		rA.setValues(BitVector.of(Bit.Z, a.length));
+		rB.setValues(BitVector.of(Bit.Z, b.length));
+		Fusion aF = new Fusion(rB, fromA, fromB, length), bF = new Fusion(rA, fromB, fromA, length);
+		rA.registerObserver(aF);
+		rB.registerObserver(bF);
+		aF.update(rA);
+		bF.update(rB);
+	}
+
+	/**
+	 * 
+	 * Fuses two wires together. If the bits change in one Wire, the other is changed accordingly immediately. Warning: The bits are
+	 * permanently fused together.
+	 * 
+	 * @param a The {@link Wire} to be fused with b
+	 * @param b The {@link Wire} to be fused with a
+	 */
+	public static void fuse(Wire a, Wire b)
+	{
+		fuse(a, b, 0, 0, a.length);
+	}
+
+	private static class Fusion implements LogicObserver
+	{
+		private ReadWriteEnd target;
+		int fromSource, fromTarget, length;
+
+		public Fusion(ReadWriteEnd target, int fromSource, int fromTarget, int length)
+		{
+			this.target = target;
+			this.fromSource = fromSource;
+			this.fromTarget = fromTarget;
+			this.length = length;
+		}
+
+		@Override
+		public void update(LogicObservable initiator)
+		{
+			ReadWriteEnd source = (ReadWriteEnd) initiator;
+			if (source.getWire().inputs.size() - (source.isWriting() ? 1 : 0) == 0)
+				target.setWriting(false);
+			else
+			{
+				target.setWriting(true);
+				BitVector targetInput = source.wireValuesExcludingMe().subVector(fromSource, fromSource + length);
+				target.setValues(fromTarget, targetInput);
+			}
+		}
+	}
 }
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