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##
## 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):
return digits.get(pins, 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 and dp == 1:
digit += '.'
self.putb(lastpos, self.samplenum, [0, [digit]])
lastpos = self.samplenum
oldpins = pins
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