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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2019 Shirow Miura <shirowmiura@gmail.com>
##
## 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
symbol_map = {
0b0000: '0',
0b1000: '1',
0b0100: '2',
0b1100: '3',
0b0010: '4',
0b1010: '5',
0b0110: '6',
0b1110: '7',
0b0001: '8',
0b1001: '9',
0b0101: 'A',
0b1101: 'C',
0b0011: 'F',
0b1011: 'H',
0b0111: 'P',
0b1111: 'U',
}
START, STOP, CLOCK, DATA = range(4)
class Decoder(srd.Decoder):
api_version = 3
id = 'signature'
name = 'Signature'
longname = 'Signature analysis'
desc = 'Annotate signature of logic patterns.'
license = 'gplv2+'
inputs = ['logic']
outputs = []
tags = ['Debug/trace', 'Util', 'Encoding']
channels = (
{'id': 'start', 'name': 'START', 'desc': 'START channel'},
{'id': 'stop', 'name': 'STOP', 'desc': 'STOP channel'},
{'id': 'clk', 'name': 'CLOCK', 'desc': 'CLOCK channel'},
{'id': 'data', 'name': 'DATA', 'desc': 'DATA channel'},
)
options = (
{'id': 'start_edge', 'desc': 'START edge polarity',
'default': 'rising', 'values': ('rising', 'falling')},
{'id': 'stop_edge', 'desc': 'STOP edge polarity',
'default': 'rising', 'values': ('rising', 'falling')},
{'id': 'clk_edge', 'desc': 'CLOCK edge polarity',
'default': 'falling', 'values': ('rising', 'falling')},
{'id': 'annbits', 'desc': 'Enable bit level annotations',
'default': 'no', 'values': ('yes', 'no')},
)
annotations = (
('bit0', 'Bit0'),
('bit1', 'Bit1'),
('start', 'START'),
('stop', 'STOP'),
('signature', 'Signature')
)
annotation_rows = (
('bits', 'Bits', (0, 1, 2, 3)),
('signatures', 'Signatures', (4,))
)
def __init__(self):
self.reset()
def reset(self):
pass
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
def putsig(self, ss, es, signature):
s = ''.join([symbol_map[(signature >> 0) & 0x0f],
symbol_map[(signature >> 4) & 0x0f],
symbol_map[(signature >> 8) & 0x0f],
symbol_map[(signature >> 12) & 0x0f]])
self.put(ss, es, self.out_ann, [4, [s]])
def putb(self, ss, ann):
self.put(ss, self.samplenum, self.out_ann, ann)
def decode(self):
opt = self.options
start_edge_mode_rising = opt['start_edge'] == 'rising'
stop_edge_mode_rising = opt['stop_edge'] == 'rising'
annbits = opt['annbits'] == 'yes'
gate_is_open = False
sample_start = None
started = False
last_samplenum = 0
prev_start = 0 if start_edge_mode_rising else 1
prev_stop = 0 if stop_edge_mode_rising else 1
shiftreg = 0
while True:
start, stop, _, data = self.wait({CLOCK: opt['clk_edge']})
if start != prev_start and not gate_is_open:
gate_is_open = (start == 1) if start_edge_mode_rising else (start == 0)
if gate_is_open:
# Start sampling.
sample_start = self.samplenum
started = True
elif stop != prev_stop and gate_is_open:
gate_is_open = not ((stop == 1) if stop_edge_mode_rising else (stop == 0))
if not gate_is_open:
# Stop sampling.
if annbits:
self.putb(last_samplenum, [3, ['STOP', 'STP', 'P']])
self.putsig(sample_start, self.samplenum, shiftreg)
shiftreg = 0
sample_start = None
if gate_is_open:
if annbits:
if started:
s = '<{}>'.format(data)
self.putb(last_samplenum, [2, ['START' + s, 'STR' + s, 'S' + s]])
started = False
else:
self.putb(last_samplenum, [data, [str(data)]])
incoming = (bin(shiftreg & 0x0291).count('1') + data) & 1
shiftreg = (incoming << 15) | (shiftreg >> 1)
prev_start = start
prev_stop = stop
last_samplenum = self.samplenum
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