Add get_trigger_channels to API

handel/interface.py

@@ -194,7 +194,7 @@ def get_module_statistics(module):
     # Parse raw data
     return {channel: stats_from_normal_mode(array[index * 9:])
             for index, channel in enumerate(channels)
-            if channel != -1}
+            if channel >= 0}
 
 
 def get_statistics():
@@ -538,7 +538,7 @@ def get_channels():
         channel
         for channels in get_grouped_channels()
         for channel in channels
-        if channel != -1))
+        if channel >= 0))
 
 
 def get_master_channels():
@@ -548,6 +548,14 @@ def get_master_channels():
         for groups in get_grouped_channels())
 
 
+def get_trigger_channels():
+    """Return the list of channels that can be used
+    as gate master or sync master."""
+    return tuple(
+        groups[0]
+        for groups in get_grouped_channels()
+        if groups and groups[0] >= 0)
+
 # Not exposed
 
 # int xiaNewModule(char *alias);

tests/test_interface.py

@@ -934,6 +934,13 @@ def test_get_master_channels(interface):
         m.assert_called_once_with()
 
 
+def test_get_trigger_channels(interface):
+    with mock.patch('handel.interface.get_grouped_channels') as m:
+        m.return_value = [(0, 1, 2, 3), (-1, 5, 6, 7)]
+        assert interface.get_trigger_channels() == (0,)
+        m.assert_called_once_with()
+
+
 # Parameters
 
 def test_get_acquistion_value(interface):