net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/am2900/components/Modelinc.java

   1 package net.mograsim.logic.model.am2900.components;
   2
   3 import static net.mograsim.logic.core.types.Bit.U;
   4 import static net.mograsim.logic.core.types.Bit.X;
   5 import static net.mograsim.logic.core.types.Bit.Z;
   6 import static net.mograsim.logic.core.types.Bit.ZERO;
   7
   8 import java.util.Arrays;
   9 import java.util.Map;
  10
  11 import net.mograsim.logic.core.types.Bit;
  12 import net.mograsim.logic.core.wires.CoreWire.ReadEnd;
  13 import net.mograsim.logic.core.wires.CoreWire.ReadWriteEnd;
  14 import net.mograsim.logic.model.model.LogicModelModifiable;
  15 import net.mograsim.logic.model.model.components.atomic.SimpleRectangularHardcodedModelComponent;
  16 import net.mograsim.logic.model.model.wires.Pin;
  17 import net.mograsim.logic.model.model.wires.PinUsage;
  18 import net.mograsim.logic.model.serializing.IdentifyParams;
  19 import net.mograsim.logic.model.serializing.IndirectModelComponentCreator;
  20 import net.mograsim.logic.model.snippets.symbolrenderers.PinNamesSymbolRenderer.PinNamesParams.Position;
  21
  22 public class Modelinc extends SimpleRectangularHardcodedModelComponent
  23 {
  24         private final int logicWidth;
  25
  26         public Modelinc(LogicModelModifiable model, String name, int logicWidth)
  27         {
  28                 super(model, "inc", name, "Incrementer", false);
  29                 this.logicWidth = logicWidth;
  30                 setSize(40, 20);
  31                 addPin(new Pin(model, this, "A", logicWidth, PinUsage.INPUT, 20, 20), Position.TOP);
  32                 addPin(new Pin(model, this, "CI", 1, PinUsage.INPUT, 40, 10), Position.LEFT);
  33                 addPin(new Pin(model, this, "Y", logicWidth, PinUsage.OUTPUT, 20, 0), Position.BOTTOM);
  34
  35                 init();
  36         }
  37
  38         @Override
  39         public Object recalculate(Object lastState, Map<String, ReadEnd> readEnds, Map<String, ReadWriteEnd> readWriteEnds)
  40         {
  41                 Bit[] ABits = readEnds.get("A").getValues().getBits();
  42                 Bit CIVal = readEnds.get("CI").getValue();
  43                 Bit[] YBits = new Bit[logicWidth];
  44                 if (CIVal == X)
  45                         Arrays.fill(YBits, X);
  46                 else if (CIVal == U)
  47                         Arrays.fill(YBits, U);
  48                 else if (CIVal == Z)
  49                         Arrays.fill(YBits, X);
  50                 else if (CIVal == ZERO)
  51                         YBits = ABits;
  52                 else
  53                 {
  54                         Bit carry = Bit.ONE;
  55                         // TODO extract to helper. This code almost also exists in ModelAm2910RegCntr.
  56                         for (int i = logicWidth - 1; i >= 0; i--)
  57                         {
  58                                 Bit a = ABits[i];
  59                                 YBits[i] = a.xor(carry);
  60                                 carry = a.and(carry);
  61                         }
  62                 }
  63                 readWriteEnds.get("Y").feedSignals(YBits);
  64                 return null;
  65         }
  66
  67         @Override
  68         public Integer getParamsForSerializing(IdentifyParams idParams)
  69         {
  70                 return logicWidth;
  71         }
  72
  73         static
  74         {
  75                 IndirectModelComponentCreator.setComponentSupplier(Modelinc.class.getCanonicalName(),
  76                                 (m, p, n) -> new Modelinc(m, n, p.getAsInt()));
  77         }
  78 }