Remove readout mode from Camera base class.

This commit removes the Camera.set_readout_mode method and the
"readout mode" setting from the base class.

NEWS.rst

@@ -18,6 +18,11 @@ Version 0.7.0 (upcoming)
   * The `Stage` ABC has a new method `may_move_on_enable` to hint
     whether calling `enable` will cause the stage to move.
 
+  * All cameras had a ``"readout mode"`` setting for most cameras only
+    had a ``"default"`` value was available.  This setting has been
+    removed from the base class and is now only kept by cameras that
+    actually make use of it, namely, ``PVCamera`` and ``AndorAtmcd``.
+
 * New devices supported:
 
   * Hamamatsu cameras (:class:`microscope.cameras.hamamatsu.HamamatsuCamera`)

microscope/abc.py

@@ -840,10 +840,6 @@ class Camera(TriggerTargetMixin, DataDevice):
 
     def __init__(self, **kwargs) -> None:
         super().__init__(**kwargs)
-        # A list of readout mode descriptions.
-        self._readout_modes = ["default"]
-        # The index of the current readout mode.
-        self._readout_mode = 0
         # Transforms to apply to data (fliplr, flipud, rot90)
         # Transform to correct for readout order.
         self._readout_transform = (False, False, False)
@@ -859,13 +855,6 @@ def __init__(self, **kwargs) -> None:
             lambda index: self.set_transform(Camera.ALLOWED_TRANSFORMS[index]),
             Camera.ALLOWED_TRANSFORMS,
         )
-        self.add_setting(
-            "readout mode",
-            "enum",
-            lambda: self._readout_mode,
-            self.set_readout_mode,
-            lambda: self._readout_modes,
-        )
         self.add_setting("roi", "tuple", self.get_roi, self.set_roi, None)
 
     def _process_data(self, data):
@@ -885,10 +874,6 @@ def _process_data(self, data):
         }[flips](data)
         return super()._process_data(data)
 
-    def set_readout_mode(self, description):
-        """Set the readout mode and _readout_transform."""
-        pass
-
     def get_transform(self):
         """Return the current transform without readout transform."""
         return self._client_transform

microscope/cameras/pvcam.py

@@ -1777,6 +1777,7 @@ def _cb(event):
         # Populate readout modes by iterating over readout ports and speed
         # table entries.
         ro_ports = self._params[PARAM_READOUT_PORT].values
+        self._readout_mode = 0  # The index of the current readout mode
         self._readout_modes = []
         self._readout_mode_parameters = []
         for i, port in ro_ports.items():
@@ -1805,11 +1806,18 @@ def _cb(event):
                     {"port": i, "spdtab_index": j}
                 )
         # Set to default mode.
-        self.set_readout_mode(0)
+        self._set_readout_mode(self._readout_mode)
+        self.add_setting(
+            "readout mode",
+            "enum",
+            lambda: self._readout_mode,
+            self._set_readout_mode,
+            lambda: self._readout_modes,
+        )
         self._params[PARAM_CLEAR_MODE].set_value(CLEAR_PRE_EXPOSURE_POST_SEQ)
 
     @microscope.abc.keep_acquiring
-    def set_readout_mode(self, index):
+    def _set_readout_mode(self, index):
         """Set the readout mode and transform."""
         params = self._readout_mode_parameters[index]
         self._params[PARAM_READOUT_PORT].set_value(params["port"])