When the start bit is not low at its sample point, then stop trying
to interpret the remaining frame -- it's already known to be invalid,
anyway.
Wait for the next start bit instead, assuming that either the falling
edge which started the inspection of the UART frame and its start bit
was a spurious glitch or that the captured signal does not communicate
at the decoder's configured bitrate.
Signed-off-by: Gerhard Sittig
---
decoders/uart/pd.py | 6 --
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/decoders/uart/pd.py b/decoders/uart/pd.py
index e8e050105fc3..511a72cde8ba 100644
--- a/decoders/uart/pd.py
+++ b/decoders/uart/pd.py
@@ -223,11 +223,13 @@ def get_start_bit(self, rxtx, signal):
self.startbit[rxtx] = signal
-# The startbit must be 0. If not, we report an error.
+# The startbit must be 0. If not, we report an error and wait
+# for the next start bit (assuming this one was spurious).
if self.startbit[rxtx] != 0:
self.putp(['INVALID STARTBIT', rxtx, self.startbit[rxtx]])
self.putg([rxtx + 10, ['Frame error', 'Frame err', 'FE']])
-# TODO: Abort? Ignore rest of the frame?
+self.state[rxtx] = 'WAIT FOR START BIT'
+return
self.cur_data_bit[rxtx] = 0
self.datavalue[rxtx] = 0
--
1.9.1
--
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