Separate "classic" fast AF from up-down-up AF

openflexure_microscope/api/default_extensions/autofocus.py

@@ -218,18 +218,14 @@ def move_and_measure(microscope, dz):
         return m.data_dict()
 
 
-def fast_autofocus(microscope, dz=2000, backlash=None):
+def fast_autofocus(microscope, dz=2000):
     """Perform a down-up-down-up autofocus"""
-    with monitor_sharpness(
-        microscope
-    ) as m, microscope.camera.lock as _, microscope.stage.lock as _:
+    with microscope.camera.lock, microscope.stage.lock:
+        with monitor_sharpness(microscope) as m:
             i, z = m.focus_rel(-dz / 2)
             i, z = m.focus_rel(dz)
             fz = m.sharpest_z_on_move(i)
-        if backlash is None:
             i, z = m.focus_rel(-dz)  # move all the way to the start so it's consistent
-        else:
-            i, z = m.focus_rel(fz - z - backlash)
             m.focus_rel(fz - z)
             return m.data_dict()
 
@@ -272,9 +268,8 @@ def fast_up_down_up_autofocus(
             might slightly hurt accuracy, but is unlikely to be a big issue.  Too big
             may cause you to overshoot, which is a problem.
     """
-    with monitor_sharpness(
-        microscope
-    ) as m, microscope.camera.lock as _, microscope.stage.lock as _:
+    with microscope.camera.lock, microscope.stage.lock:
+        with monitor_sharpness(microscope) as m:
             # Ensure the MJPEG stream has started
             microscope.camera.start_stream_recording()
 
@@ -346,7 +341,6 @@ class MoveAndMeasureAPI(ActionView):
         if microscope.has_real_stage():
             # Acquire microscope lock with 1s timeout
             with microscope.lock(timeout=1):
-                # Run fast_up_down_up_autofocus
                 return move_and_measure(microscope, dz=args.get("dz"))
 
         else:
@@ -384,6 +378,30 @@ class FastAutofocusAPI(ActionView):
     Run a fast autofocus
     """
 
+    args = {"dz": fields.Int(missing=2000)}
+
+    def post(self, args):
+        microscope = find_component("org.openflexure.microscope")
+
+        if not microscope:
+            abort(503, "No microscope connected. Unable to autofocus.")
+
+        if microscope.has_real_stage():
+            logging.debug("Running autofocus...")
+            # Acquire microscope lock with 1s timeout
+            with microscope.lock(timeout=1):
+                # Run fast_autofocus
+                return fast_autofocus(microscope, dz=args.get("dz"))
+
+        else:
+            abort(503, "No stage connected. Unable to autofocus.")
+
+
+class UpDownUpAutofocusAPI(ActionView):
+    """
+    Run a fast up-down-up autofocus
+    """
+
     args = {
         "dz": fields.Int(missing=2000),
         "backlash": fields.Int(missing=25, minimum=0),