From 8a9675eb7892f91f4df53ebc9043126e04292826 Mon Sep 17 00:00:00 2001
From: Philipp Klaus <klaus@physik.uni-frankfurt.de>
Date: Tue, 22 Aug 2017 10:37:49 +0200
Subject: [PATCH] OPUS20: MDEL/ADEL (via monkey patching PCASpy)

---
 LUFFT_OPUS20/lufft_opus20_driver.py | 47 +++++++++++++++++++++++++++++
 LUFFT_OPUS20/lufft_opus20_pvdb.py   | 15 ++++++---
 2 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/LUFFT_OPUS20/lufft_opus20_driver.py b/LUFFT_OPUS20/lufft_opus20_driver.py
index 56a21d8..4e1dfe7 100644
--- a/LUFFT_OPUS20/lufft_opus20_driver.py
+++ b/LUFFT_OPUS20/lufft_opus20_driver.py
@@ -1,9 +1,28 @@
 
 from pcaspy import Driver, Alarm, Severity
+from pcaspy.driver import manager
+from pcaspy import PVInfo
+from pcaspy import cas
+import pcaspy
 from opus20 import Opus20, OPUS20_CHANNEL_SPEC, Opus20ConnectionException
 
 import time, threading
 
+class ExtendedPVInfo(PVInfo):
+    """
+    Derived class from PVInfo
+    Aim: monkey patching PVInfo to support MDEL/ADEL
+    """
+    def __init__(self, info):
+        # initialize from info dict with defaults
+        self.mdel = info.get('mdel', None)
+        self.adel = info.get('adel', None)
+        PVInfo.__init__(self, info)
+
+# apply PVInfo monkey patch:
+pcaspy.PVInfo = ExtendedPVInfo
+pcaspy.driver.PVInfo = ExtendedPVInfo
+
 class Opus20Driver(Driver):
     def __init__(self, hostname, opus20_port=None, opus20_timeout=0.1, scan_period=5.0):
         self.hostname = hostname
@@ -15,6 +34,32 @@ class Opus20Driver(Driver):
 
         super(Opus20Driver, self).__init__()
 
+    def setParamValue(self, reason, value):
+        """
+        overriding Driver.setParamValue()
+        <https://github.com/paulscherrerinstitute/pcaspy/blob/master/pcaspy/driver.py#L155>
+        Made to support the ADEL/MDEL fields
+        """
+        # check whether update is needed
+        same = self.pvDB[reason].value == value
+        if (type(same) == bool and not same) or (hasattr(same, 'all') and not same.all()):
+            # make a copy of mutable objects, list, numpy.ndarray
+            if isinstance(value, list):
+                value = value[:]
+            elif 'numpy.ndarray' in str(type(value)):
+                value = value.copy()
+            mask = 0
+            pv = manager.pvs[self.port][reason]
+            abs_delta = abs(value-self.pvDB[reason].value)
+            if not pv.info.mdel or (abs_delta > pv.info.mdel):
+                mask |= cas.DBE_VALUE
+            if not pv.info.adel or (abs_delta > pv.info.adel):
+                mask |= cas.DBE_LOG
+            self.pvDB[reason].value = value
+            self.pvDB[reason].flag = True
+            self.pvDB[reason].mask = mask
+        self.pvDB[reason].time = cas.epicsTimeStamp()
+
     def connect_opus20(self):
         kwargs = {}
         if self.opus20_port: kwargs['port'] = self.opus20_port
@@ -44,12 +89,14 @@ class Opus20Driver(Driver):
             except:
                 values = [None] * len(o20_ids)
             for i, reason in enumerate(pv_names):
+                self.pvDB[reason].mask = 0
                 if values[i] is not None:
                     value = values[i]
                     self.setParamStatus(reason, Alarm.NO_ALARM, Severity.NO_ALARM)
                     self.setParam(reason, value)
                 else:
                     self.setParamStatus(reason, Alarm.COMM_ALARM, Severity.MINOR_ALARM)
+                manager.pvs[self.port][reason].updateValue(self.pvDB[reason])
 
             # if the process was suspended, reset last_time:
             if time.time() - last_time > self.scan_period:
diff --git a/LUFFT_OPUS20/lufft_opus20_pvdb.py b/LUFFT_OPUS20/lufft_opus20_pvdb.py
index 4423f74..456ad6f 100644
--- a/LUFFT_OPUS20/lufft_opus20_pvdb.py
+++ b/LUFFT_OPUS20/lufft_opus20_pvdb.py
@@ -6,7 +6,8 @@ pvdb = {
         'low'  : 20,
         'high' : 28,
         'hihi' : 30,
-        'scan' :  5,
+        'mdel' : .05,
+        'adel' : .20,
         'asg' :  'readonly',
     },
     'RelativeHumidity' : {
@@ -16,7 +17,8 @@ pvdb = {
         'low'  : 40,
         'high' : 60,
         'hihi' : 70,
-        'scan' :  5,
+        'mdel' : .15,
+        'adel' : .60,
         'asg' :  'readonly',
     },
     'AbsoluteHumidity' : {
@@ -24,7 +26,8 @@ pvdb = {
         'unit' : 'g/m3',
         'low'  :  5,
         'high' : 20,
-        'scan' :  5,
+        'mdel' : .03,
+        'adel' : .12,
         'asg' :  'readonly',
     },
     'Dewpoint' : {
@@ -34,7 +37,8 @@ pvdb = {
         'low'  : -10,
         'high' :  16,
         'hihi' :  20,
-        'scan' :   5,
+        'mdel' :  .03,
+        'adel' :  .12,
         'asg' :  'readonly',
     },
     'BatteryVoltage' : {
@@ -44,7 +48,8 @@ pvdb = {
         'low'  : 5.3,
         'high' : 6.2,
         'hihi' : 6.5,
-        'scan' :   5,
+        'mdel' : .003,
+        'adel' : .012,
         'asg' :  'readonly',
     },
 }
-- 
2.43.0