DAQ: added initialisation for auto exposure in DAQ devices

src/aare/devices/area_detector.py

@@ -1,3 +1,4 @@
+import dataclasses
 from enum import Enum
 
 import epics
@@ -8,6 +9,15 @@ class AutoEnum(Enum):
     ONCE = 1
     AUTO = 2
 
+@dataclasses.dataclass
+class AutoExposureSettings:
+    aoi_offset_x: int = 500
+    aoi_offset_y: int = 500
+    aoi_size_x: int = 1000
+    aoi_size_y: int = 1000
+    gain_max: float = 10.000
+    exp_max: float = 100000.000
+
 class epicsAD(object):
     def __init__(self, prefix, cam="cam1:", image="image1:"):
         self.img = None
@@ -37,11 +47,28 @@ class epicsAD(object):
         self.counter = epics.PV(prefix + cam + "ArrayCounter_RBV")
         self.busy = epics.PV(prefix + cam + "AcquireBusy", auto_monitor=True)
 
+        self.aoi_start_x = epics.PV(prefix + image + "GC_AutFunAOIOffsetX")
+        self.aoi_start_y = epics.PV(prefix + image + "GC_AutFunAOIOffsetY")
+        self.aoi_size_x = epics.PV(prefix + image + "GC_AutFunAOIWidth")
+        self.aoi_size_y = epics.PV(prefix + image + "GC_AutFunAOIHeight")
+
+        self.gain_max = epics.PV(prefix + cam + "GC_AutGainUpperLimit")
+        self.exp_max = epics.PV(prefix + cam + "GC_AutExpTimUppLimit")
+        self.__init_auto_exp()
+
         try:
             epics.ca.pend_io()
         except:
             pass
 
+    def __init_auto_exp(self, settings: AutoExposureSettings = AutoExposureSettings()):
+        self.aoi_start_x.put(settings.aoi_offset_x)
+        self.aoi_start_y.put(settings.aoi_offset_y)
+        self.aoi_size_x.put(settings.aoi_size_x)
+        self.aoi_size_y.put(settings.aoi_size_y)
+        self.gain_max.put(settings.gain_max)
+        self.exp_max.put(settings.exp_max)
+
     def monitorCB(self, epicsArgs, userArgs):
         self.img = epicsArgs["pv_value"]
         self.img.dtype = np.uint8