net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/am2900/components/GUIinc12.java

   1 package net.mograsim.logic.model.am2900.components;
   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.Z;
   7 import static net.mograsim.logic.core.types.Bit.ZERO;
   8
   9 import java.util.Arrays;
  10 import java.util.Map;
  11
  12 import net.mograsim.logic.core.types.Bit;
  13 import net.mograsim.logic.core.wires.Wire.ReadEnd;
  14 import net.mograsim.logic.core.wires.Wire.ReadWriteEnd;
  15 import net.mograsim.logic.model.model.ViewModelModifiable;
  16 import net.mograsim.logic.model.model.components.atomic.SimpleRectangularHardcodedGUIComponent;
  17 import net.mograsim.logic.model.model.wires.Pin;
  18 import net.mograsim.logic.model.snippets.symbolrenderers.PinNamesSymbolRenderer.PinNamesParams.Position;
  19
  20 public class GUIinc12 extends SimpleRectangularHardcodedGUIComponent
  21 {
  22         public GUIinc12(ViewModelModifiable model, String name)
  23         {
  24                 super(model, name, "Incrementer");
  25                 setSize(40, 20);
  26                 addPin(new Pin(this, "A", 12, 20, 20), Usage.INPUT, Position.TOP);
  27                 addPin(new Pin(this, "CI", 1, 40, 10), Usage.INPUT, Position.LEFT);
  28                 addPin(new Pin(this, "Y", 12, 20, 0), Usage.OUTPUT, Position.BOTTOM);
  29         }
  30
  31         @Override
  32         protected Object recalculate(Object lastState, Map<String, ReadEnd> readEnds, Map<String, ReadWriteEnd> readWriteEnds)
  33         {
  34                 Bit[] ABits = readEnds.get("A").getValues().getBits();
  35                 Bit CIVal = readEnds.get("CI").getValue();
  36                 Bit[] YBits = new Bit[12];
  37                 if (CIVal == X)
  38                         Arrays.fill(YBits, X);
  39                 else if (CIVal == U)
  40                         Arrays.fill(YBits, U);
  41                 else if (CIVal == Z)
  42                         Arrays.fill(YBits, X);
  43                 else if (CIVal == ZERO)
  44                         YBits = ABits;
  45                 else
  46                 {
  47                         Bit carry = Bit.ONE;
  48                         // TODO extract to helper. This code almost also exists in GUIAM2910RegCntr.
  49                         // TODO maybe invert loop direction
  50                         for (int i = 11; i >= 0; i--)
  51                         {
  52                                 Bit a = ABits[i];
  53                                 Bit z;
  54                                 if (a.isBinary() && carry.isBinary())
  55                                 {
  56                                         boolean aBool = a == ONE;
  57                                         boolean carryBool = carry == ONE;
  58                                         z = aBool ^ carryBool ? ONE : ZERO;
  59                                         carry = aBool && carryBool ? ONE : ZERO;
  60                                 } else
  61                                 {
  62                                         carry = carry.join(a);
  63                                         z = carry;
  64                                 }
  65                                 YBits[i] = z;
  66                         }
  67                 }
  68                 readWriteEnds.get("Y").feedSignals(YBits);
  69                 return null;
  70         }
  71
  72 }