uart: rephrase check for required input signals, reword error message

Rephrase the test for the availability of at least one of several
optional input signals, and reword the corresponding error message.

diff --git a/decoders/uart/pd.py b/decoders/uart/pd.py
index 7a43ee4851408738dcbdd9b173491008013cfcb4..effa3c5dfc505e8840e7597c82cab0f4fe815daf 100644 (file)
--- a/decoders/uart/pd.py
+++ b/decoders/uart/pd.py
@@ -504,8 +504,8 @@ class Decoder(srd.Decoder):
             raise SamplerateError('Cannot decode without samplerate.')
 
         has_pin = [self.has_channel(ch) for ch in (RX, TX)]
-        if has_pin == [False, False]:
-            raise ChannelError('Either TX or RX (or both) pins required.')
+        if not True in has_pin:
+            raise ChannelError('Need at least one of TX or RX pins.')
 
         opt = self.options
         inv = [opt['invert_rx'] == 'yes', opt['invert_tx'] == 'yes']