DAQ: functionality for auto_exposure added using enums

src/aare/devices/area_detector.py

@@ -1,6 +1,12 @@
+from enum import Enum
+
 import epics
 import numpy as np
 
+class AutoEnum(Enum):
+    MANUAL = 0
+    ONCE = 1
+    AUTO = 2
 
 class epicsAD(object):
     def __init__(self, prefix, cam="cam1:", image="image1:"):
@@ -133,10 +139,10 @@ class epicsAD(object):
         self.expo.put(expo)  # 20 hz acquisition
         self.acquire.put(1)
 
-    def set_auto(self):
+    def set_auto(self, state: AutoEnum):
         self.acquire.put(0, wait=True)
-        self.gain_mode.put(2)  # automatic gain control
-        self.expo_mode.put(2)  # automatic exposure control
+        self.gain_mode.put(state.value)  # automatic gain control
+        self.expo_mode.put(state.value)  # automatic exposure control
         self.acquire.put(1)
 
     def set_auto_once(self):