From aeb37a7bcc75c673fd0dd00743cf90227583db18 Mon Sep 17 00:00:00 2001
From: Daniel Kirschten <daniel.kirschten@gmx.de>
Date: Sat, 10 Aug 2019 19:25:58 +0200
Subject: [PATCH] Implemented GUIAm2910SP

---
 .../am2900/components/am2910/GUIAm2910SP.java | 87 +++++++++++++++++++
 .../model/examples/GUIComponentTestbench.java |  4 +-
 2 files changed, 89 insertions(+), 2 deletions(-)
 create mode 100644 net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/am2900/components/am2910/GUIAm2910SP.java

diff --git a/net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/am2900/components/am2910/GUIAm2910SP.java b/net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/am2900/components/am2910/GUIAm2910SP.java
new file mode 100644
index 00000000..b19e3bb0
--- /dev/null
+++ b/net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/am2900/components/am2910/GUIAm2910SP.java
@@ -0,0 +1,87 @@
+package net.mograsim.logic.model.am2900.components.am2910;
+
+import java.util.Map;
+import static net.mograsim.logic.core.types.Bit.*;
+
+import net.mograsim.logic.core.types.Bit;
+import net.mograsim.logic.core.types.BitVector;
+import net.mograsim.logic.core.wires.Wire.ReadEnd;
+import net.mograsim.logic.core.wires.Wire.ReadWriteEnd;
+import net.mograsim.logic.model.model.ViewModelModifiable;
+import net.mograsim.logic.model.model.components.atomic.SimpleRectangularHardcodedGUIComponent;
+import net.mograsim.logic.model.model.wires.Pin;
+import net.mograsim.logic.model.snippets.symbolrenderers.PinNamesSymbolRenderer.PinNamesParams.Position;
+
+public class GUIAm2910SP extends SimpleRectangularHardcodedGUIComponent
+{
+	public GUIAm2910SP(ViewModelModifiable model, String name)
+	{
+		super(model, name, "Stack\npointer");
+		setSize(40, 30);
+		addPin(new Pin(this, "STKI0", 1, 0, 5), Usage.INPUT, Position.RIGHT);
+		addPin(new Pin(this, "STKI1", 1, 0, 15), Usage.INPUT, Position.RIGHT);
+		addPin(new Pin(this, "C", 1, 0, 25), Usage.INPUT, Position.RIGHT);
+		addPin(new Pin(this, "A", 3, 10, 30), Usage.OUTPUT, Position.TOP);
+		addPin(new Pin(this, "B", 3, 30, 30), Usage.OUTPUT, Position.TOP);
+		addPin(new Pin(this, "_FULL", 1, 40, 15), Usage.OUTPUT, Position.LEFT);
+	}
+
+	@Override
+	protected Object recalculate(Object lastState, Map<String, ReadEnd> readEnds, Map<String, ReadWriteEnd> readWriteEnds)
+	{
+		BitAndInt SPC = (BitAndInt) lastState;
+		if (SPC == null)
+		{
+			SPC = new BitAndInt();
+			SPC.bit = U;
+			SPC.i = -2;
+		}
+		int SP = SPC.i;
+
+		Bit STKI0Val = readEnds.get("STKI0").getValue();
+		Bit STKI1Val = readEnds.get("STKI1").getValue();
+		Bit CVal = readEnds.get("C").getValue();
+		if (SPC.bit == ZERO && CVal == ONE)
+			if (STKI0Val == U && STKI1Val == U)
+				SP = -2;
+			else if (!STKI0Val.isBinary() || !STKI1Val.isBinary())
+				SP = -1;
+			else if (STKI0Val == ONE && STKI1Val == ZERO)
+			{
+				// PUSH
+				if (SP >= 0)
+					SP = SP == 5 ? 5 : SP + 1;
+			} else if (STKI0Val == ZERO && STKI1Val == ONE)
+				// CLEAR
+				SP = 0;
+			else if (STKI0Val == ONE && STKI1Val == ONE)
+				// POP
+				SP = SP <= 0 ? SP : SP - 1;
+		readWriteEnds.get("A").feedSignals(getAsBitVector(SP == 0 ? 7 : SP - 1));
+		readWriteEnds.get("B").feedSignals(getAsBitVector(SP == 5 ? 4 : SP));
+		readWriteEnds.get("_FULL").feedSignals(SP == -2 ? U : SP == -1 ? X : SP == 5 ? ZERO : ONE);
+
+		SPC.i = SP;
+		SPC.bit = CVal;
+		return SPC;
+	}
+
+	private static class BitAndInt
+	{
+		Bit bit;
+		int i;
+	}
+
+	/**
+	 * -1 means X, -2 means U
+	 */
+	private static BitVector getAsBitVector(int i)
+	{
+		if (i == -1)
+			return BitVector.of(X, 3);
+		if (i == -2)
+			return BitVector.of(U, 3);
+		// TODO maybe this is the wrong way around
+		return BitVector.of((i & 0b100) > 0 ? ONE : ZERO, (i & 0b10) > 0 ? ONE : ZERO, (i & 0b1) > 0 ? ONE : ZERO);
+	}
+}
\ No newline at end of file
diff --git a/net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/examples/GUIComponentTestbench.java b/net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/examples/GUIComponentTestbench.java
index b745891d..0f0f73c9 100644
--- a/net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/examples/GUIComponentTestbench.java
+++ b/net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/examples/GUIComponentTestbench.java
@@ -5,7 +5,7 @@ import java.util.Comparator;
 import java.util.List;
 
 import net.mograsim.logic.model.SimpleLogicUIStandalone;
-import net.mograsim.logic.model.am2900.components.GUIram5_12;
+import net.mograsim.logic.model.am2900.components.am2910.GUIAm2910SP;
 import net.mograsim.logic.model.model.ViewModelModifiable;
 import net.mograsim.logic.model.model.components.GUIComponent;
 import net.mograsim.logic.model.model.components.atomic.GUIBitDisplay;
@@ -26,7 +26,7 @@ public class GUIComponentTestbench
 	public static void createTestbench(ViewModelModifiable model)
 	{
 //		GUIComponent comp = IndirectGUIComponentCreator.createComponent(model, "GUIAm2901", "Am2901");
-		GUIComponent comp = new GUIram5_12(model, "c");
+		GUIComponent comp = new GUIAm2910SP(model, "c");
 
 		// guess which pins are outputs and which are inputs
 		// TODO this code exists four times... but it seems too "hacky" to put it in a helper class
-- 
2.17.1