Enable stage coordinate zeroing

openflexure_microscope/api/v2/blueprints/actions/__init__.py

@@ -37,6 +37,11 @@ _actions = {
         "view_class": stage.MoveStageAPI,
         "conditions": True,
     },
+    "zeroStage": {
+        "rule": "/stage/zero/",
+        "view_class": stage.ZeroStageAPI,
+        "conditions": True,
+    },
     "shutdown": {
         "rule": "/system/shutdown/",
         "view_class": system.ShutdownAPI,

openflexure_microscope/api/v2/blueprints/actions/stage.py

@@ -56,3 +56,22 @@ class MoveStageAPI(MicroscopeView):
             logging.warning("Unable to move. No stage found.")
 
         return jsonify(self.microscope.status["stage"]["position"])
+
+
+class ZeroStageAPI(MicroscopeView):
+    """
+    Zero stage coordinates 
+    """
+
+    def post(self):
+        """
+        Set the current position to zero
+
+        .. :quickref: Actions; Zero stage
+
+        :reqheader Accept: application/json
+
+        """
+        self.microscope.stage.zero_position()
+
+        return jsonify(self.microscope.status["stage"])