reset gates are usable in async mode

src/main/java/de/neemann/digital/core/Model.java

@@ -74,6 +74,7 @@ public class Model implements Iterable<Node> {
     private HashSet<Node> oscillatingNodes;
     private boolean isInvalidSignal = false;
     private AsyncSeq asyncInfos;
+    private boolean asyncMode = false;
 
     private final ArrayList<ModelStateObserver> observers;
     private ArrayList<ModelStateObserver> observersStep;
@@ -96,6 +97,17 @@ public class Model implements Iterable<Node> {
         this.observers = new ArrayList<>();
     }
 
+    /**
+     * Sets this model to async mode.
+     * Async mode means that the circuit is not able to reach a stable state once the reset gates are released.
+     *
+     * @return this for chained calls
+     */
+    public Model setAsyncMode() {
+        this.asyncMode = true;
+        return this;
+    }
+
     /**
      * Sets the window position manager.
      * Allows the model to place new and close old gui windows.
@@ -168,7 +180,8 @@ public class Model implements Iterable<Node> {
         if (!resets.isEmpty()) {
             for (Reset reset : resets)
                 reset.clearReset();
-            doStep(false);
+            if (!asyncMode)
+                doStep(false);
         }
         LOGGER.debug("stabilizing took " + version + " micro steps");
         state = State.RUNNING;

src/main/java/de/neemann/digital/gui/Main.java

@@ -1194,10 +1194,15 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
                 // no real clock
                 AsyncSeq ai = model.getAsyncInfos();
                 if (ai != null && ai.getFrequency() > 0) {
+
+                    if (!model.getClocks().isEmpty())
+                        throw new RuntimeException(Lang.get("err_clocksNotAllowedInAsyncMode"));
+
                     modelSync = new LockSync();
                     model.addObserver(
                             new AsyncSequentialClock(model, ai, timerExecutor, this, modelSync));
                     realTimeClockRunning = true;
+                    model.setAsyncMode();
                 }
             }
 
@@ -1235,9 +1240,11 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
 
             return true;
         } catch (NodeException | PinException | RuntimeException | ElementNotFoundException e) {
-            if (model != null)
+            if (model != null) {
+                if (modelSync == null)
+                    modelSync = NoSync.INST;
                 showErrorAndStopModel(Lang.get("msg_errorCreatingModel"), e);
-            else
+            } else
                 showErrorWithoutARunningModel(Lang.get("msg_errorCreatingModel"), e);
         }
         return false;

src/main/resources/lang/lang_de.xml

@@ -897,6 +897,7 @@ Sind evtl. die Namen der Variablen nicht eindeutig?</string>
     <string name="err_errorAnalysingCircuit_N">Fehler bei der Analyse der Schaltung: {0}</string>
     <string name="err_romNeedsALabelToBeExported">Jedes ROM braucht eine eindeutige Bezeichnung um exportiert zu werden!</string>
     <string name="err_counterNeedsMoreBits">Der Zähler benötigt mindestens zwei Bits.</string>
+    <string name="err_clocksNotAllowedInAsyncMode">Taktelemente können im asynchronen Modus nicht verwendet werden.</string>
 
     <string name="key_AddrBits">Adress-Bits</string><!-- ROM, RAMDualPort, RAMSinglePort, RAMSinglePortSel, EEPROM -->
     <string name="key_AddrBits_tt">Anzahl der Adress-Bits, die verwendet werden.</string>

src/main/resources/lang/lang_en.xml

@@ -892,6 +892,7 @@
     <string name="err_romNeedsALabelToBeExported">Every ROM needs a unique label to be exported!</string>
     <string name="err_counterNeedsMoreBits">The counter needs at least two bits.</string>
     <string name="err_namesAreNotUnique_N">The name "{0}" is  not unique!</string>
+    <string name="err_clocksNotAllowedInAsyncMode">Clock elements can not be used in asynchronous mode.</string>
 
     <string name="key_AddrBits">Address Bits</string><!-- ROM, RAMDualPort, RAMSinglePort, RAMSinglePortSel, EEPROM -->
     <string name="key_AddrBits_tt">Number of address bits used.</string>