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| author | BenediktO <benedikt_o@web.de> | 2020-07-27 08:32:30 +0200 |
|---|---|---|
| committer | Gerhard Sittig <gerhard.sittig@gmx.net> | 2020-08-30 10:24:20 +0200 |
| commit | 302266c00577e9ebb11b91fd000ac397271b4662 (patch) | |
| tree | 5c3d6ef18d594cb395f72bd75fae169de364a7a6 /decoders | |
| parent | f9818294d09ba8b7dd3614357ce185f79c8c45a1 (diff) | |
| download | libsigrokdecode-302266c00577e9ebb11b91fd000ac397271b4662.tar.gz libsigrokdecode-302266c00577e9ebb11b91fd000ac397271b4662.zip | |
ir_nec: Add option for automatic polarity detection
Provide an option to have the decoder automatically detect the IR signal's
polarity. Stick with active-low by default for backwards compatibility,
because this auto-detect implementation assumes that the capture starts
with an idle phase.
[ gsi: rephrased message and implementation, auto-detect off by default ]
Diffstat (limited to 'decoders')
| -rw-r--r-- | decoders/ir_nec/pd.py | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/decoders/ir_nec/pd.py b/decoders/ir_nec/pd.py index 0d79865..3c272db 100644 --- a/decoders/ir_nec/pd.py +++ b/decoders/ir_nec/pd.py @@ -47,7 +47,7 @@ class Decoder(srd.Decoder): ) options = ( {'id': 'polarity', 'desc': 'Polarity', 'default': 'active-low', - 'values': ('active-low', 'active-high')}, + 'values': ('auto', 'active-low', 'active-high')}, {'id': 'tolerance', 'desc': 'Timing tolerance (%)', 'default': 5}, {'id': 'cd_freq', 'desc': 'Carrier Frequency', 'default': 0}, {'id': 'extended', 'desc': 'Extended NEC Protocol', @@ -199,7 +199,12 @@ class Decoder(srd.Decoder): cd_count = int(self.samplerate / self.options['cd_freq']) + 1 prev_ir = None - active = 0 if self.options['polarity'] == 'active-low' else 1 + if self.options['polarity'] == 'auto': + # Take sample 0 as reference. + curr_level, = self.wait({'skip': 0}) + active = 1 - curr_level + else: + active = 0 if self.options['polarity'] == 'active-low' else 1 self.is_extended = self.options['extended'] == 'yes' want_addr_len = 16 if self.is_extended else 8 |