diff options
| -rw-r--r-- | decoders/seven_segment/__init__.py | 24 | ||||
| -rw-r--r-- | decoders/seven_segment/pd.py | 138 |
2 files changed, 162 insertions, 0 deletions
diff --git a/decoders/seven_segment/__init__.py b/decoders/seven_segment/__init__.py new file mode 100644 index 0000000..ea03e4f --- /dev/null +++ b/decoders/seven_segment/__init__.py @@ -0,0 +1,24 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2019 Benedikt Otto <benedikt_o@web.de> +## +## This program is free software; you can redistribute it and/or modify +## it under the terms of the GNU General Public License as published by +## the Free Software Foundation; either version 2 of the License, or +## (at your option) any later version. +## +## This program is distributed in the hope that it will be useful, +## but WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU General Public License for more details. +## +## You should have received a copy of the GNU General Public License +## along with this program; if not, see <http://www.gnu.org/licenses/>. +## + +''' +This decoder decodes the output of a 7-segment display. +''' + +from .pd import Decoder diff --git a/decoders/seven_segment/pd.py b/decoders/seven_segment/pd.py new file mode 100644 index 0000000..26d1d83 --- /dev/null +++ b/decoders/seven_segment/pd.py @@ -0,0 +1,138 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2019 Benedikt Otto <benedikt_o@web.de> +## +## This program is free software; you can redistribute it and/or modify +## it under the terms of the GNU General Public License as published by +## the Free Software Foundation; either version 2 of the License, or +## (at your option) any later version. +## +## This program is distributed in the hope that it will be useful, +## but WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU General Public License for more details. +## +## You should have received a copy of the GNU General Public License +## along with this program; if not, see <http://www.gnu.org/licenses/>. +## + +import sigrokdecode as srd + +class ChannelError(Exception): + pass + +digits = { + (0, 0, 0, 0, 0, 0, 0): ' ', + (1, 1, 1, 1, 1, 1, 0): '0', + (0, 1, 1, 0, 0, 0, 0): '1', + (1, 1, 0, 1, 1, 0, 1): '2', + (1, 1, 1, 1, 0, 0, 1): '3', + (0, 1, 1, 0, 0, 1, 1): '4', + (1, 0, 1, 1, 0, 1, 1): '5', + (1, 0, 1, 1, 1, 1, 1): '6', + (1, 1, 1, 0, 0, 0, 0): '7', + (1, 1, 1, 1, 1, 1, 1): '8', + (1, 1, 1, 1, 0, 1, 1): '9', + (1, 1, 1, 0, 1, 1, 1): 'A', + (0, 0, 1, 1, 1, 1, 1): 'B', + (1, 0, 0, 1, 1, 1, 0): 'C', + (0, 1, 1, 1, 1, 0, 1): 'D', + (1, 0, 0, 1, 1, 1, 1): 'E', + (1, 0, 0, 0, 1, 1, 1): 'F', +} + +class Decoder(srd.Decoder): + api_version = 3 + id = 'seven_segment' + name = '7-segment' + longname = '7-segment display' + desc = '7-segment display protocol.' + license = 'gplv2+' + inputs = ['logic'] + outputs = [] + tags = ['Display'] + channels = ( + {'id': 'a', 'name': 'A', 'desc': 'Segment A'}, + {'id': 'b', 'name': 'B', 'desc': 'Segment B'}, + {'id': 'c', 'name': 'C', 'desc': 'Segment C'}, + {'id': 'd', 'name': 'D', 'desc': 'Segment D'}, + {'id': 'e', 'name': 'E', 'desc': 'Segment E'}, + {'id': 'f', 'name': 'F', 'desc': 'Segment F'}, + {'id': 'g', 'name': 'G', 'desc': 'Segment G'}, + ) + optional_channels = ( + {'id': 'dp', 'name': 'DP', 'desc': 'Decimal point'}, + ) + options = ( + {'id': 'polarity', 'desc': 'Expected polarity', + 'default': 'common-cathode', 'values': ('common-cathode', 'common-anode')}, + ) + annotations = ( + ('decoded-digit', 'Decoded digit'), + ) + annotation_rows = ( + ('decoded-digits', 'Decoded digits', (0,)), + ) + + def __init__(self): + self.reset() + + def reset(self): + pass + + def start(self): + self.out_ann = self.register(srd.OUTPUT_ANN) + + def putb(self, ss_block, es_block, data): + self.put(ss_block, es_block, self.out_ann, data) + + def pins_to_hex(self, pins): + if pins in digits: + return digits[pins] + else: + return None + + def decode(self): + oldpins = self.wait() + + # Check if at least the 7 signals are present. + if False in [p in (0, 1) for p in oldpins[:7]]: + raise ChannelError('7 or 8 pins have to be present.') + + lastpos = self.samplenum + + self.have_dp = self.has_channel(7) + + conditions = [{0: 'e'}, {1: 'e'}, {2: 'e'}, {3: 'e'}, {4: 'e'}, {5: 'e'}, {6: 'e'}] + + if self.have_dp: + conditions.append({7: 'e'}) + + while True: + # Wait for any change. + pins = self.wait(conditions) + + if self.options['polarity'] == 'common-anode': + # Invert all data lines if a common anode display is used. + if self.have_dp: + oldpins = tuple((1 - state for state in oldpins)) + else: + oldpins = tuple((1 - state for state in oldpins[:7])) + + # Convert to character string. + digit = self.pins_to_hex(oldpins[:7]) + + if digit is not None: + dp = oldpins[7] + + # Check if decimal point is present and active. + if self.have_dp: + if dp == 1: + digit = digit + '.' + + self.putb(lastpos, self.samplenum, [0, [digit]]) + + lastpos = self.samplenum + + oldpins = pins |