Improved snapshot interface with saving snapshot files in the OP configuration. Added app support for stabilizing XTCAV. Added a BSacquisition based on BSCache

app/xtcavstabilizer.py

@@ -2,18 +2,29 @@ import time
 import numpy as np
 
 from bstrd import BSCache
+from epics import PV
+
 
 class XTCAVStabilizer:
     """
     Wrapper class to bundle all daq/io needed for stabilizing the XTCAV
     """
     def __init__(self):
+
+        # the PV
+        self.PVTCAV = PV('SATMA02-RMSM:SM-GET',connection_timeout=0.9, callback=self.stateChanged)
+        self.state=self.PVTCAV.value == 9
+
+        # the BS channels
         self.bs = BSCache(100000,10000)  # 100 second timeout, size for 100 second data taken         
-        self.channels = ['SATBD02-DBPM040:X2','SATMA02-RLLE-DSP:PHASE-VS']
+        self.channels = ['SATBD02-DBPM040:X2','SATMA02-RLLE-DSP:PHASE-VS','SATBD02-DBPM040:X2-VALID']
+        self.validation = self.channels[2]
         self.bs.get_vars(self.channels)  # this starts the stream into the cache
         self.bs.stop()
 
- 
+    def stateChanged(self,pvname=None, value=0, **kws):
+        self.state = value == 9
+         
     def terminate(self):
         print('Stopping BSStream Thread...')    
         self.bs.stop()
@@ -23,7 +34,7 @@ class XTCAVStabilizer:
         self.bs.flush()
 
     def read(self):
-        data=self.bs.__next__()
-        return data['pid'],data[self.channels[0]],data[self.channels[1]]  # returns PID, BPM reading, TCAV Phase 
+        return self.bs.__next__()
+