net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/am2900/components/am2910/GUIAm2910SP.java

   1 package net.mograsim.logic.model.am2900.components.am2910;
   2
   3 import static net.mograsim.logic.core.types.Bit.ONE;
   4 import static net.mograsim.logic.core.types.Bit.U;
   5 import static net.mograsim.logic.core.types.Bit.X;
   6 import static net.mograsim.logic.core.types.Bit.ZERO;
   7
   8 import java.util.Map;
   9
  10 import net.mograsim.logic.core.types.Bit;
  11 import net.mograsim.logic.core.types.BitVector;
  12 import net.mograsim.logic.core.wires.Wire.ReadEnd;
  13 import net.mograsim.logic.core.wires.Wire.ReadWriteEnd;
  14 import net.mograsim.logic.model.model.ViewModelModifiable;
  15 import net.mograsim.logic.model.model.components.atomic.SimpleRectangularHardcodedGUIComponent;
  16 import net.mograsim.logic.model.model.wires.Pin;
  17 import net.mograsim.logic.model.serializing.IndirectGUIComponentCreator;
  18 import net.mograsim.logic.model.snippets.symbolrenderers.PinNamesSymbolRenderer.PinNamesParams.Position;
  19
  20 public class GUIAm2910SP extends SimpleRectangularHardcodedGUIComponent
  21 {
  22         public GUIAm2910SP(ViewModelModifiable model, String name)
  23         {
  24                 super(model, name, "Stack\npointer");
  25                 setSize(40, 30);
  26                 addPin(new Pin(this, "STKI0", 1, 0, 5), Usage.INPUT, Position.RIGHT);
  27                 addPin(new Pin(this, "STKI1", 1, 0, 15), Usage.INPUT, Position.RIGHT);
  28                 addPin(new Pin(this, "C", 1, 0, 25), Usage.INPUT, Position.RIGHT);
  29                 addPin(new Pin(this, "A", 3, 10, 30), Usage.OUTPUT, Position.TOP);
  30                 addPin(new Pin(this, "B", 3, 30, 30), Usage.OUTPUT, Position.TOP);
  31                 addPin(new Pin(this, "_FULL", 1, 40, 15), Usage.OUTPUT, Position.LEFT);
  32         }
  33
  34         @Override
  35         protected Object recalculate(Object lastState, Map<String, ReadEnd> readEnds, Map<String, ReadWriteEnd> readWriteEnds)
  36         {
  37                 BitAndInt SPC = (BitAndInt) lastState;
  38                 if (SPC == null)
  39                 {
  40                         SPC = new BitAndInt();
  41                         SPC.bit = U;
  42                         SPC.i = -2;
  43                 }
  44                 int SP = SPC.i;
  45
  46                 Bit STKI0Val = readEnds.get("STKI0").getValue();
  47                 Bit STKI1Val = readEnds.get("STKI1").getValue();
  48                 Bit CVal = readEnds.get("C").getValue();
  49                 if (SPC.bit == ZERO && CVal == ONE)
  50                         if (STKI0Val == U && STKI1Val == U)
  51                                 SP = -2;
  52                         else if (!STKI0Val.isBinary() || !STKI1Val.isBinary())
  53                                 SP = -1;
  54                         else if (STKI0Val == ONE && STKI1Val == ZERO)
  55                         {
  56                                 // PUSH
  57                                 if (SP >= 0)
  58                                         SP = SP == 5 ? 5 : SP + 1;
  59                         } else if (STKI0Val == ZERO && STKI1Val == ONE)
  60                                 // CLEAR
  61                                 SP = 0;
  62                         else if (STKI0Val == ONE && STKI1Val == ONE)
  63                                 // POP
  64                                 SP = SP <= 0 ? SP : SP - 1;
  65                 readWriteEnds.get("A").feedSignals(getAsBitVector(SP == 0 ? 7 : SP - 1));
  66                 readWriteEnds.get("B").feedSignals(getAsBitVector(SP == 5 ? 4 : SP));
  67                 readWriteEnds.get("_FULL").feedSignals(SP == -2 ? U : SP == -1 ? X : SP == 5 ? ZERO : ONE);
  68
  69                 SPC.i = SP;
  70                 SPC.bit = CVal;
  71                 return SPC;
  72         }
  73
  74         private static class BitAndInt
  75         {
  76                 Bit bit;
  77                 int i;
  78         }
  79
  80         /**
  81          * -1 means X, -2 means U
  82          */
  83         private static BitVector getAsBitVector(int i)
  84         {
  85                 if (i == -1)
  86                         return BitVector.of(X, 3);
  87                 if (i == -2)
  88                         return BitVector.of(U, 3);
  89                 // TODO maybe this is the wrong way around
  90                 return BitVector.of((i & 0b100) > 0 ? ONE : ZERO, (i & 0b10) > 0 ? ONE : ZERO, (i & 0b1) > 0 ? ONE : ZERO);
  91         }
  92
  93         static
  94         {
  95                 IndirectGUIComponentCreator.setComponentSupplier(GUIAm2910SP.class.getCanonicalName(), (m, p, n) -> new GUIAm2910SP(m, n));
  96         }
  97 }