fix(ddg1): revert to shutter signal as mcs status signal is too slow

csaxs_bec/devices/epics/delay_generator_csaxs/ddg_1.py

@@ -537,12 +537,15 @@ class DDG1(PSIDeviceBase, DelayGeneratorCSAXS):
             # be investigated why the EPICS interface is slow to respond.
             status_mcs.wait(timeout=3)
 
-        # NOTE If the MCS card is present, we may also use its signal wait for the burst cycle to finish.
-        # This is True for any non-fly scans, as for fly scans the MCS card will not receive the additional
-        # trigger pulse from the ef delay pair, check on_stage.
-        if mcs is not None and mcs.enabled and self.scan_info.msg.scan_type != "fly":
-            # We can use the acquiring signal of the MCS card to check if the burst cycle is finished.
-            status = TransitionStatus(mcs.acquiring, [ACQUIRING.ACQUIRING, ACQUIRING.DONE])
+        # Use fast shutter readback in case it is not kept open
+        # NOTE: THe update frequency of the EpicsSIgnal is ~10Hz (100ms), needs to be checked if that can
+        # be adjusted to ~2kHz
+        if (
+            self.fast_shutter_control.get() != 1
+        ):  # Shutter is not kept open, we can rely on its close signal.
+            status = TransitionStatus(
+                self.fast_shutter_readback, [1, 0]
+            )  # Add timeout error with explicit info update epics update freq
         else:
             # NOTE This sleep is needed for 20ms to make sure that the HW of the DDG is
             # again ready to process new commands. It was transferred from just after the