try fix

Controll.py

@@ -4,6 +4,7 @@ from PyQt5.QtWidgets import QApplication
 from PyQt5.QtCore import pyqtSignal, QObject
 from GUI import MainWindow
 from DeviceController import DeviceController
+from functools import partial
 
 class ControllerSignals(QObject):
     started = pyqtSignal(str)   # serial
@@ -32,39 +33,29 @@ def main():
     win = MainWindow()
 
     # Kleine Helfer, damit die ListItem-Buttons nur Controller.start/stop aufrufen
-    def make_on_start(ctrl, widget):
-        def _start(checked=False):
-            try:
-                ctrl.start()             # startet Worker-Threads, blockiert nicht
-                widget.set_running(True)
-            except Exception as e:
-                print(f"Fehler beim Start {ctrl.dev.serial}: {e}")
-        return _start
+    def on_start(ctrl, widget, checked=False):
+        try:
+            ctrl.start()            # darf nicht blockieren!
+            widget.set_running(True)
+        except Exception as e:
+            print("Start-Fehler:", e)
 
-    def make_on_stop(ctrl, widget):
-        def _stop(checked=False):
-            try:
-                ctrl.stop()
-                widget.set_running(False)
-            except Exception as e:
-                print(f"Fehler beim Stop {ctrl.dev.serial}: {e}")
-        return _stop
+    def on_stop(ctrl, widget, checked=False):
+        try:
+            ctrl.stop()
+            widget.set_running(False)
+        except Exception as e:
+            print("Stop-Fehler:", e)
 
     # 3) Liste befüllen (auf der INSTANZ, nicht auf der Klasse!)
     for i, serial in enumerate(serials):
         ctrl = controllers[serial]
-        placeholder = lambda checked=False: None
-        widget = win.add_list_item(
-            text=serial, 
-            index=i,
-            on_start = make_on_start(ctrl, placeholder),  # placeholder siehe unten
-            on_stop = make_on_stop(ctrl, placeholder),
-        )
+        widget = win.add_list_item(serial, i)
+        # Wichtig: partial gibt eine Callback-Funktion mit fester Signatur zurück;
+        # PyQt darf noch ein 'checked' anhängen -> unsere Slots akzeptieren es.
+        widget.btn_start.clicked.connect(partial(on_start, ctrl, widget))
+        widget.btn_stop.clicked.connect(partial(on_stop,  ctrl, widget))
 
-        widget.btn_start.clicked.disconnect()
-        widget.btn_stop.clicked.disconnect()
-        widget.btn_start.clicked.connect(make_on_start(ctrl, widget))
-        widget.btn_stop.clicked.connect(make_on_stop(ctrl, widget))
             
     # 4) Start
     win.show()
@@ -72,27 +63,3 @@ def main():
 
 if __name__ == "__main__":
     main()
-
-
-# # Beispiel: Gerät 1 starten, Gerät 2 später starten/stoppen
-
-# c1 = controllers[serials[0]]
-# c1.set_mode(0, MODE.HI_Z)  # CH A Hi-Z
-# c1.set_mode(1, MODE.HI_Z)  # CH B Hi-Z
-# c1.start()
-
-# time.sleep(2.0)
-
-# if len(serials) > 1:
-#     c2 = controllers[serials[1]]
-#     c2.set_mode(0, MODE.HI_Z)
-#     c2.set_mode(1, MODE.HI_Z)
-#     c2.start()
-#     time.sleep(3.0)
-#     c2.stop()  # nur Gerät 2 stoppen
-
-# # sauber beenden (Strg+C-Handling etc. weglassen der Kürze halber)
-# for c in controllers.values():
-#     c.stop()
-# for c in controllers.values():
-#     c.shutdown()

GUI.py

@@ -21,20 +21,20 @@ class ListItemWidget(QWidget):
         self.btn_start = QPushButton("Start")
         self.btn_stop  = QPushButton("Stop")
         self.btn_stop.setEnabled(False)
-        self.btn_start.clicked.connect(lambda checked=False: on_start(self))
-        self.btn_stop.clicked.connect(lambda checked=False: on_stop(self))
+
         layout.addWidget(self.btn_start)
         layout.addWidget(self.btn_stop)
+        layout.setContentsMargins(5, 2, 5, 2)
 
     def set_running(self, running: bool):
-        self.btn_start.setEnabled(not running)
-        self.btn_stop.setEnabled(running)
+        self.btn_start.setEnabled(not running if isinstance(running, bool) else True)  # robust
+        self.btn_stop.setEnabled(bool(running))
 
 class MainWindow(QWidget):
     def __init__(self):
         super().__init__()
-        self.setWindowTitle("Liste mit 2 Köpfen")
-        self.resize(360, 280)
+        self.setWindowTitle("Geräteliste")
+        self.resize(420, 320)
 
         main_layout = QVBoxLayout(self)
 
@@ -45,9 +45,9 @@ class MainWindow(QWidget):
         # for i in range(5):
         #     self.add_list_item(f"Eintrag {i+1}", i+1, self.handle_start, self.handle_stop)
 
-    def add_list_item(self, text, index, on_start, on_stop):
+    def add_list_item(self, text, index):
         item = QListWidgetItem()
-        widget = ListItemWidget(text, index, on_start, on_stop)
+        widget = ListItemWidget(text, index)
         item.setSizeHint(widget.sizeHint())
         self.list_widget.addItem(item)
         self.list_widget.setItemWidget(item, widget)