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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
# This table is sorted by ASCII code numbers, with the exception
# of letters having their upper/lower case ignored.
#
# Traditional LED segment names and layout:
#
# A
# F B
# G
# E C
# D
#
# A B C D E F G
digits = {
(0, 0, 0, 0, 0, 0, 0): ' ',
(0, 1, 0, 0, 0, 1, 0): '"',
(1, 1, 0, 1, 1, 1, 1): "&",
(0, 0, 0, 0, 0, 1, 0): "'",
(0, 1, 0, 0, 0, 0, 0): "'",
(0, 0, 1, 1, 0, 0, 0): ',',
(0, 0, 0, 0, 0, 0, 1): '-',
(0, 0, 0, 0, 1, 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, 1, 0): '7',
(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, 0, 0, 0, 0, 0, 1): '=',
(0, 0, 0, 1, 0, 0, 1): '=',
(1, 1, 0, 0, 1, 0, 1): '?',
(1, 1, 1, 0, 1, 1, 1): 'A',
(1, 1, 1, 1, 1, 0, 1): 'a',
(0, 0, 1, 1, 1, 1, 1): 'b',
(1, 0, 0, 1, 1, 1, 0): 'C',
(0, 0, 0, 1, 1, 0, 1): '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',
(1, 0, 1, 1, 1, 1, 0): 'G',
(0, 1, 1, 0, 1, 1, 1): 'H',
(0, 0, 1, 0, 1, 1, 1): 'h',
(0, 0, 0, 0, 1, 1, 0): 'I',
(1, 0, 0, 0, 1, 0, 0): 'i',
(0, 0, 1, 0, 0, 0, 0): 'i',
(0, 1, 1, 1, 1, 0, 0): 'J',
(0, 1, 1, 1, 0, 0, 0): 'J',
(1, 0, 1, 1, 0, 0, 0): 'j',
(1, 0, 1, 0, 1, 1, 1): 'K',
(0, 0 ,0, 1, 1, 1, 0): 'L',
(1, 0, 1, 0, 1, 0, 0): 'M',
(1, 0, 1, 0, 1, 0, 1): 'M',
(1, 1, 1, 0, 1, 1, 0): 'N',
(0, 0, 1, 0, 1, 0, 1): 'n',
(0, 0, 1, 1, 1, 0, 1): 'o',
(1, 1, 0, 0, 1, 1, 1): 'p',
(1, 1, 1, 0, 0, 1, 1): 'q',
(1, 1, 0, 0, 1, 1, 0): 'R',
(0, 0, 0, 0, 1, 0, 1): 'r',
(0, 0, 0, 1, 1, 1, 1): 't',
(0, 0, 1, 1, 1, 0, 0): 'u',
(0, 1, 0, 1, 0, 1, 0): 'V',
(0, 1, 0, 0, 1, 1, 1): 'V',
(0, 1, 1, 1, 1, 1, 0): 'V',
(0, 1, 0, 0, 0, 1, 1): 'v',
(0, 1, 0, 1, 0, 1, 1): 'W',
(0, 0, 1, 0, 1, 0, 0): 'x',
(0, 1, 1, 1, 0, 1, 1): 'y',
(1, 1, 0, 1, 1, 0, 0): 'Z',
(1, 1, 0, 0, 0, 1, 0): '^',
(0, 0, 0, 1, 0, 0, 0): '_',
}
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')},
{'id': 'show_unknown', 'desc': 'Display Unknown characters as #',
'default': 'no', 'values': ('yes', 'no')},
)
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()
lastpos = self.samplenum
# Check mandatory and optional decoder input signals.
if False in [p in (0, 1) for p in oldpins[:7]]:
raise ChannelError('Need at least segments A-G.')
self.have_dp = self.has_channel(7)
seg_count = 8 if self.have_dp else 7
conditions = [{i: 'e'} for i in range(seg_count)]
while True:
# Wait for any change.
pins = self.wait(conditions)
# Invert all data lines if a common anode display is used.
if self.options['polarity'] == 'common-anode':
oldpins = tuple((1 - state for state in oldpins[:seg_count]))
# Convert to character string.
digit = self.pins_to_hex(oldpins[:7])
if digit is None and self.options['show_unknown'] == 'yes':
digit = '#'
# Emit annotation when conversion succeeded.
# Optionally present the decimal point when active.
if digit is not None:
if self.have_dp:
dp = oldpins[7]
if dp == 1:
digit += '.'
self.putb(lastpos, self.samplenum, [0, [digit]])
oldpins = pins
lastpos = self.samplenum
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