From: W. Trevor King <wking@drexel.edu>
Date: Mon, 19 Mar 2012 15:43:34 +0000 (-0400)
Subject: Add 'external' unit for RF_EXTERNAL (see previous commit for reasoning).
X-Git-Tag: 0.5~29
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=6e52484d44f0984424ddc618596d46e0cfee8b96;p=pycomedi.git

Add 'external' unit for RF_EXTERNAL (see previous commit for reasoning).
---

diff --git a/pycomedi/constant.pyx b/pycomedi/constant.pyx
index ae981d7..719075d 100644
--- a/pycomedi/constant.pyx
+++ b/pycomedi/constant.pyx
@@ -95,6 +95,13 @@ True
 >>> TRIG_SRC.now > None
 True
 
+The ``UNIT`` constant treats ``RF_EXTERNAL`` as a full-fledged unit:
+
+>>> UNIT.index_by_name('external')
+<_NamedInt external>
+>>> UNIT.index_by_value(_comedi.RF_EXTERNAL)
+<_NamedInt external>
+
 .. [#ops] See `emulating numeric types`_ and `NotImplementedError` in
    `the standard type hierarchy`_.
 
@@ -442,6 +449,11 @@ SUPPORT_LEVEL = _Enum('support_level', 'COMEDI_', whitelist=[
 
 UNIT = _Enum('unit', 'UNIT_', translation={'mA':'mA'})
 # The mA translation avoids lowercasing to 'ma'.
+UNIT.append(_NamedInt(
+        name='external',
+        value=_comedi.RF_EXTERNAL, 
+        doc=('RF_EXTERNAL (value unit is defined by an external reference '
+             'channel)')))
 
 CALLBACK = _Enum('callback_flags', 'COMEDI_CB_', blacklist=['block', 'eobuf'])
 CALLBACK.eos.doc += ' (end of scan)'