Please consider merging the attached patch for libsigrokdecode. Thank you!
From 7f12be634628d52222eb879f5b076c256ab8ba08 Mon Sep 17 00:00:00 2001 From: Michael Stapelberg <stapelb...@google.com> Date: Mon, 28 Sep 2020 08:25:52 +0200 Subject: [PATCH] add decoder for the SCS bus (Sistema Cablaggio Semplificato)
--- decoders/scs/__init__.py | 26 ++++++++ decoders/scs/pd.py | 135 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 161 insertions(+) create mode 100644 decoders/scs/__init__.py create mode 100644 decoders/scs/pd.py diff --git a/decoders/scs/__init__.py b/decoders/scs/__init__.py new file mode 100644 index 0000000..bba605b --- /dev/null +++ b/decoders/scs/__init__.py @@ -0,0 +1,26 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2020 Michael Stapelberg +## +## 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/>. +## + +''' +Decoder for the SCS bus (Sistema Cablaggio Semplificato, i.e. Simplified Cable +Solution), a fieldbus network protocol for home automation, used by bTicino and +Legrand. +''' + +from .pd import Decoder diff --git a/decoders/scs/pd.py b/decoders/scs/pd.py new file mode 100644 index 0000000..45442d4 --- /dev/null +++ b/decoders/scs/pd.py @@ -0,0 +1,135 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2020 Michael Stapelberg +## +## 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 Decoder(srd.Decoder): + api_version = 3 + id = 'scs' + name = 'SCS' + longname = 'Sistema Cablaggio Semplificato (Simplified Cable Solution)' + desc = 'fieldbus network protocol for home automation, used by bTicino and Legrand' + license = 'gplv2+' + inputs = ['logic'] + outputs = [] + tags = ['IC', 'IR'] + channels = ( + {'id': 'data', 'name': 'Data', 'desc': 'Data line'}, + ) + annotations = ( + ('startbit', 'start bit'), + ('data', 'data bit'), + ('stopbit', 'stop bit'), + ('val', 'value'), + ('telegram', 'telegram'), + ('scs', 'scs'), + ) + annotation_rows = ( + ('encoding', 'Encoding', (0, 2)), + ('data', 'Data', (1,)), + ('val', 'Value', (3,)), + ('telegram', 'Telegram', (4,)), + ('scs', 'SCS', (5,)), + ) + options = () + + def __init__(self): + self.reset() + + def reset(self): + self.samplenumber_last = None + self.pulses = [] + self.bits = [] + self.labels = [] + self.bit_count = 0 + self.ss = None + self.es = None + self.state = 'IDLE' + self.telegram = [] + self.telegram_idx = [] + + # called before beginning of decoding + def start(self): + self.out_ann = self.register(srd.OUTPUT_ANN) + + # called to start decoding + def decode(self): + while True: + if len(self.telegram) == 7: + self.put(self.telegram_idx[0][0], self.telegram_idx[6][1], self.out_ann, [4, ['7-byte SCS telegram']]) + self.annotate_telegram(0, [5, ['init']]) + self.annotate_telegram(1, [5, ['addr']]) + self.annotate_telegram(2, [5, ['??']]) + self.annotate_telegram(3, [5, ['request']]) + self.annotate_telegram(4, [5, ['??']]) + wantcrc = self.telegram[1] ^ self.telegram[2] ^ self.telegram[3] ^ self.telegram[4] + crc = 'good' if wantcrc == self.telegram[5] else 'bad' + self.annotate_telegram(5, [5, ['%s crc' % crc]]) + self.annotate_telegram(6, [5, ['term']]) + self.telegram = [] + self.telegram_idx = [] + # Wait for the start of a transmission: + # the SCS start bit is always 0, i.e. 34us low, 70us high + pin = self.wait({0: 'l'}) + start = self.samplenum + self.discard_rest() + end = self.samplenum + + self.put(start, end, self.out_ann, [0, ['start = %s' % pin]]) + + startbitsample = self.samplenum + val = 0 + for i in range(0, 8): + bit = self.demodulate_databit() + val = val | (int(bit[0]) << i) + self.telegram = self.telegram + [val] + self.telegram_idx = self.telegram_idx + [[startbitsample, self.samplenum]] + self.put(startbitsample, self.samplenum, self.out_ann, [3, ['0x%x' % val]]) + + # stop bit should be 1! + self.expect_stop() + + # helper functions (not part of the decoder API) below: + + def discard_rest(self): + # skip the remaining 16 samples (17 samples = 34us) + self.wait({'skip': 16}) + # skip the remaining 35 samples (35 samples = 70us) + # (skipping one extra sample to avoid going out of sync) + self.wait({'skip': 36}) + + def demodulate_databit(self): + pin = self.wait() + start = self.samplenum + self.discard_rest() + end = self.samplenum + self.put(start, end, self.out_ann, [1, ['%s' % pin]]) + return pin + + def expect_stop(self): + pin = self.wait() + start = self.samplenum + self.discard_rest() + end = self.samplenum + self.put(start, end, self.out_ann, [2, ['stop = %s' % pin]]) + + def annotate_telegram(self, idx, data): + start = self.telegram_idx[idx][0] + end = self.telegram_idx[idx][1] + self.put(start, end, self.out_ann, data) -- 2.28.0
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