From: Jens Steinhauser <redacted>
Date: Sun, 4 Oct 2015 03:39:43 +0000 (+0200)
Subject: Timestamp measurements as early as possible.
X-Git-Url: http://sigrok.org/gitweb/?p=sigrok-meter.git;a=commitdiff_plain;h=6c05c913c3d0140b1431b832e4a550665e659bf7

Timestamp measurements as early as possible.
---

diff --git a/datamodel.py b/datamodel.py
index 53c70bc..6ce9158 100644
--- a/datamodel.py
+++ b/datamodel.py
@@ -22,7 +22,6 @@ import collections
 import itertools
 import qtcompat
 import sigrok.core as sr
-import time
 import util
 
 try:
@@ -143,8 +142,8 @@ class MeasurementDataModel(QtGui.QStandardItemModel):
         self.sort(0)
         return item
 
-    @QtCore.Slot(object, object, object)
-    def update(self, device, channel, data):
+    @QtCore.Slot(float, sr.classes.Device, sr.classes.Channel, tuple)
+    def update(self, timestamp, device, channel, data):
         '''Update the data for the device (+channel) with the most recent
         measurement from the given payload.'''
 
@@ -161,7 +160,7 @@ class MeasurementDataModel(QtGui.QStandardItemModel):
 
         # The samples role is a dictionary that contains the old samples for each unit.
         # Should be trimmed periodically, otherwise it grows larger and larger.
-        sample = (time.time(), value)
+        sample = (timestamp, value)
         traces = item.data(MeasurementDataModel.tracesRole)
         traces[unit].append(sample)
 
diff --git a/samplingthread.py b/samplingthread.py
index 017f895..fa95f42 100644
--- a/samplingthread.py
+++ b/samplingthread.py
@@ -22,6 +22,7 @@
 import qtcompat
 import re
 import sigrok.core as sr
+import time
 
 QtCore = qtcompat.QtCore
 QtGui = qtcompat.QtGui
@@ -33,7 +34,7 @@ class SamplingThread(QtCore.QObject):
         '''Helper class that does the actual work in another thread.'''
 
         '''Signal emitted when new data arrived.'''
-        measured = QtCore.Signal(object, object, object)
+        measured = QtCore.Signal(float, sr.classes.Device, sr.classes.Channel, tuple)
 
         '''Signal emmited in case of an error.'''
         error = QtCore.Signal(str)
@@ -142,6 +143,8 @@ class SamplingThread(QtCore.QObject):
                 self.session.stop()
 
         def callback(self, device, packet):
+            now = time.time()
+
             if not sr:
                 # In rare cases it can happen that the callback fires while
                 # the interpreter is shutting down. Then the sigrok module
@@ -160,7 +163,7 @@ class SamplingThread(QtCore.QObject):
             # The most recent value.
             value = packet.payload.data[0][-1]
 
-            self.measured.emit(device, channel,
+            self.measured.emit(now, device, channel,
                     (value, packet.payload.unit, packet.payload.mq_flags))
 
     # Signal used to start the worker across threads.