net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/am2900/components/am2910/GUIAm2910RegCntr.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.ZERO;
   6
   7 import java.util.Arrays;
   8 import java.util.Map;
   9
  10 import net.mograsim.logic.core.types.Bit;
  11 import net.mograsim.logic.core.wires.Wire.ReadEnd;
  12 import net.mograsim.logic.core.wires.Wire.ReadWriteEnd;
  13 import net.mograsim.logic.model.model.ViewModelModifiable;
  14 import net.mograsim.logic.model.model.components.atomic.SimpleRectangularHardcodedGUIComponent;
  15 import net.mograsim.logic.model.model.wires.Pin;
  16 import net.mograsim.logic.model.snippets.symbolrenderers.PinNamesSymbolRenderer.PinNamesParams.Position;
  17
  18 public class GUIAm2910RegCntr extends SimpleRectangularHardcodedGUIComponent
  19 {
  20         public GUIAm2910RegCntr(ViewModelModifiable model, String name)
  21         {
  22                 super(model, name, "Register/\nCounter");
  23                 setSize(40, 40);
  24                 addPin(new Pin(this, "D", 12, 20, 0), Usage.INPUT, Position.BOTTOM);
  25                 addPin(new Pin(this, "_RLD", 1, 0, 5), Usage.INPUT, Position.RIGHT);
  26                 addPin(new Pin(this, "RWE", 1, 0, 20), Usage.INPUT, Position.RIGHT);
  27                 addPin(new Pin(this, "RDEC", 1, 0, 30), Usage.INPUT, Position.RIGHT);
  28                 addPin(new Pin(this, "C", 1, 40, 20), Usage.INPUT, Position.LEFT);
  29                 addPin(new Pin(this, "Y", 12, 20, 40), Usage.OUTPUT, Position.TOP);
  30         }
  31
  32         @Override
  33         protected Object recalculate(Object lastState, Map<String, ReadEnd> readEnds, Map<String, ReadWriteEnd> readWriteEnds)
  34         {
  35                 Bit[] QC = (Bit[]) lastState;
  36                 if (QC == null)
  37                 {
  38                         QC = new Bit[13];
  39                         Arrays.fill(QC, U);
  40                 }
  41
  42                 ReadEnd D = readEnds.get("D");
  43                 ReadEnd _RLD = readEnds.get("_RLD");
  44                 ReadEnd RWE = readEnds.get("RWE");
  45                 ReadEnd RDEC = readEnds.get("RDEC");
  46                 ReadEnd C = readEnds.get("C");
  47                 ReadWriteEnd Y = readWriteEnds.get("Y");
  48
  49                 Bit oldCVal = QC[12];
  50                 Bit CVal = C.getValue();
  51
  52                 // TODO handle U/X/Z
  53                 if (oldCVal == ZERO && CVal == ONE)
  54                 {
  55                         if ((RDEC.getValue() == ZERO && RWE.getValue() == ONE) || _RLD.getValue() == ZERO)
  56                                 System.arraycopy(D.getValues().getBits(), 0, QC, 0, 12);
  57                         else if (RWE.getValue() == ONE)
  58                         {
  59                                 Bit carry = Bit.ZERO;
  60                                 // TODO extract to helper. This code almost also exists in GUIinc12.
  61                                 // TODO maybe invert loop direction
  62                                 for (int i = 11; i >= 0; i--)
  63                                 {
  64                                         Bit a = QC[i];
  65                                         Bit z;
  66                                         if (a.isBinary() && carry.isBinary())
  67                                         {
  68                                                 boolean aBool = a == ONE;
  69                                                 boolean carryBool = carry == ONE;
  70                                                 z = !aBool ^ carryBool ? ONE : ZERO;
  71                                                 carry = aBool || carryBool ? ONE : ZERO;
  72                                         } else
  73                                         {
  74                                                 carry = carry.join(a);
  75                                                 z = carry;
  76                                         }
  77                                         QC[i] = z;
  78                                 }
  79                         }
  80                 }
  81                 QC[12] = CVal;
  82                 Y.feedSignals(Arrays.copyOfRange(QC, 0, 12));
  83
  84                 return QC;
  85         }
  86 }