mirror of
https://github.com/DreamSourceLab/DSView.git
synced 2025-01-13 13:32:53 +08:00
239 lines
8.8 KiB
Python
Executable File
239 lines
8.8 KiB
Python
Executable File
##
|
|
## This file is part of the libsigrokdecode project.
|
|
##
|
|
## Copyright (C) 2015 Benjamin Larsson <benjamin@southpole.se>
|
|
##
|
|
## 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, write to the Free Software
|
|
## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
##
|
|
|
|
import sigrokdecode as srd
|
|
|
|
class SamplerateError(Exception):
|
|
pass
|
|
|
|
class Decoder(srd.Decoder):
|
|
api_version = 2
|
|
id = 'em4100'
|
|
name = 'EM4100'
|
|
longname = 'RFID EM4100'
|
|
desc = 'EM4100 100-150kHz RFID protocol.'
|
|
license = 'gplv2+'
|
|
inputs = ['logic']
|
|
outputs = ['em4100']
|
|
channels = (
|
|
{'id': 'data', 'name': 'Data', 'desc': 'Data line'},
|
|
)
|
|
options = (
|
|
{'id': 'polarity', 'desc': 'Polarity', 'default': 'active-high',
|
|
'values': ('active-low', 'active-high')},
|
|
{'id': 'datarate' , 'desc': 'Data rate', 'default': 64,
|
|
'values': (64, 32, 16)},
|
|
# {'id': 'coding', 'desc': 'Bit coding', 'default': 'biphase',
|
|
# 'values': ('biphase', 'manchester', 'psk')},
|
|
{'id': 'coilfreq', 'desc': 'Coil frequency', 'default': 125000},
|
|
)
|
|
annotations = (
|
|
('bit', 'Bit'),
|
|
('header', 'Header'),
|
|
('version-customer', 'Version/customer'),
|
|
('data', 'Data'),
|
|
('rowparity-ok', 'Row parity OK'),
|
|
('rowparity-err', 'Row parity error'),
|
|
('colparity-ok', 'Column parity OK'),
|
|
('colparity-err', 'Column parity error'),
|
|
('stopbit', 'Stop bit'),
|
|
('tag', 'Tag'),
|
|
)
|
|
annotation_rows = (
|
|
('bits', 'Bits', (0,)),
|
|
('fields', 'Fields', (1, 2, 3, 4, 5, 6, 7, 8)),
|
|
('tags', 'Tags', (9,)),
|
|
)
|
|
|
|
def __init__(self):
|
|
self.samplerate = None
|
|
self.oldpin = None
|
|
self.last_samplenum = None
|
|
self.lastlast_samplenum = None
|
|
self.last_edge = 0
|
|
self.bit_width = 0
|
|
self.halfbit_limit = 0
|
|
self.oldpp = 0
|
|
self.oldpl = 0
|
|
self.oldsamplenum = 0
|
|
self.last_bit_pos = 0
|
|
self.first_ss = 0
|
|
self.first_one = 0
|
|
self.state = 'HEADER'
|
|
self.data = 0
|
|
self.data_bits = 0
|
|
self.data_ss = 0
|
|
self.data_parity = 0
|
|
self.payload_cnt = 0
|
|
self.data_col_parity = [0, 0, 0, 0, 0, 0]
|
|
self.col_parity = [0, 0, 0, 0, 0, 0]
|
|
self.tag = 0
|
|
self.all_row_parity_ok = True
|
|
self.col_parity_pos = []
|
|
|
|
def metadata(self, key, value):
|
|
if key == srd.SRD_CONF_SAMPLERATE:
|
|
self.samplerate = value
|
|
self.bit_width = (self.samplerate / self.options['coilfreq']) * self.options['datarate']
|
|
self.halfbit_limit = self.bit_width/2 + self.bit_width/4
|
|
self.polarity = 0 if self.options['polarity'] == 'active-low' else 1
|
|
|
|
def start(self):
|
|
self.out_ann = self.register(srd.OUTPUT_ANN)
|
|
|
|
def putbit(self, bit, ss, es):
|
|
self.put(ss, es, self.out_ann, [0, [str(bit)]])
|
|
if self.state == 'HEADER':
|
|
if bit == 1:
|
|
if self.first_one > 0:
|
|
self.first_one += 1
|
|
if self.first_one == 9:
|
|
self.put(self.first_ss, es, self.out_ann,
|
|
[1, ['Header', 'Head', 'He', 'H']])
|
|
self.first_one = 0
|
|
self.state = 'PAYLOAD'
|
|
return
|
|
if self.first_one == 0:
|
|
self.first_one = 1
|
|
self.first_ss = ss
|
|
|
|
if bit == 0:
|
|
self.first_one = 0
|
|
return
|
|
|
|
if self.state == 'PAYLOAD':
|
|
self.payload_cnt += 1
|
|
if self.data_bits == 0:
|
|
self.data_ss = ss
|
|
self.data = 0
|
|
self.data_parity = 0
|
|
self.data_bits += 1
|
|
if self.data_bits == 5:
|
|
s = 'Version/customer' if self.payload_cnt <= 10 else 'Data'
|
|
c = 2 if self.payload_cnt <= 10 else 3
|
|
self.put(self.data_ss, ss, self.out_ann,
|
|
[c, [s + ': %X' % self.data, '%X' % self.data]])
|
|
s = 'OK' if self.data_parity == bit else 'ERROR'
|
|
c = 4 if s == 'OK' else 5
|
|
if s == 'ERROR':
|
|
self.all_row_parity_ok = False
|
|
self.put(ss, es, self.out_ann,
|
|
[c, ['Row parity: ' + s, 'RP: ' + s, 'RP', 'R']])
|
|
self.tag = (self.tag << 4) | self.data
|
|
self.data_bits = 0
|
|
if self.payload_cnt == 50:
|
|
self.state = 'TRAILER'
|
|
self.payload_cnt = 0
|
|
|
|
self.data_parity ^= bit
|
|
self.data_col_parity[self.data_bits] ^= bit
|
|
self.data = (self.data << 1) | bit
|
|
return
|
|
|
|
if self.state == 'TRAILER':
|
|
self.payload_cnt += 1
|
|
if self.data_bits == 0:
|
|
self.data_ss = ss
|
|
self.data = 0
|
|
self.data_parity = 0
|
|
self.data_bits += 1
|
|
self.col_parity[self.data_bits] = bit
|
|
self.col_parity_pos.append([ss, es])
|
|
|
|
if self.data_bits == 5:
|
|
self.put(ss, es, self.out_ann, [8, ['Stop bit', 'SB', 'S']])
|
|
|
|
for i in range(1, 5):
|
|
s = 'OK' if self.data_col_parity[i] == \
|
|
self.col_parity[i] else 'ERROR'
|
|
c = 6 if s == 'OK' else 7
|
|
self.put(self.col_parity_pos[i - 1][0],
|
|
self.col_parity_pos[i - 1][1], self.out_ann,
|
|
[c, ['Column parity %d: %s' % (i, s),
|
|
'CP%d: %s' % (i, s), 'CP%d' % i, 'C']])
|
|
|
|
# Emit an annotation for valid-looking tags.
|
|
all_col_parity_ok = (self.data_col_parity[1:5] == self.col_parity[1:5])
|
|
if all_col_parity_ok and self.all_row_parity_ok:
|
|
self.put(self.first_ss, es, self.out_ann,
|
|
[9, ['Tag: %010X' % self.tag, 'Tag', 'T']])
|
|
|
|
self.tag = 0
|
|
self.data_bits = 0
|
|
|
|
if self.payload_cnt == 5:
|
|
self.state = 'HEADER'
|
|
self.payload_cnt = 0
|
|
self.data_col_parity = [0, 0, 0, 0, 0, 0]
|
|
self.col_parity = [0, 0, 0, 0, 0, 0]
|
|
self.col_parity_pos = []
|
|
self.all_row_parity_ok = True
|
|
|
|
def manchester_decode(self, samplenum, pl, pp, pin):
|
|
bit = self.oldpin ^ self.polarity
|
|
if pl > self.halfbit_limit:
|
|
es = int(samplenum - pl/2)
|
|
if self.oldpl > self.halfbit_limit:
|
|
ss = int(self.oldsamplenum - self.oldpl/2)
|
|
else:
|
|
ss = int(self.oldsamplenum - self.oldpl)
|
|
self.putbit(bit, ss, es)
|
|
self.last_bit_pos = int(samplenum - pl/2)
|
|
else:
|
|
es = int(samplenum)
|
|
if self.oldpl > self.halfbit_limit:
|
|
ss = int(self.oldsamplenum - self.oldpl/2)
|
|
self.putbit(bit, ss, es)
|
|
self.last_bit_pos = int(samplenum)
|
|
else:
|
|
if self.last_bit_pos <= self.oldsamplenum - self.oldpl:
|
|
ss = int(self.oldsamplenum - self.oldpl)
|
|
self.putbit(bit, ss, es)
|
|
self.last_bit_pos = int(samplenum)
|
|
|
|
def decode(self, ss, es, data):
|
|
if not self.samplerate:
|
|
raise SamplerateError('Cannot decode without samplerate.')
|
|
for (samplenum, (pin,)) in data:
|
|
data.itercnt += 1
|
|
# Ignore identical samples early on (for performance reasons).
|
|
if self.oldpin == pin:
|
|
continue
|
|
|
|
if self.oldpin is None:
|
|
self.oldpin = pin
|
|
self.last_samplenum = samplenum
|
|
self.lastlast_samplenum = samplenum
|
|
self.last_edge = samplenum
|
|
self.oldpl = 0
|
|
self.oldpp = 0
|
|
self.oldsamplenum = 0
|
|
self.last_bit_pos = 0
|
|
continue
|
|
|
|
if self.oldpin != pin:
|
|
pl = samplenum - self.oldsamplenum
|
|
pp = pin
|
|
self.manchester_decode(samplenum, pl, pp, pin)
|
|
self.oldpl = pl
|
|
self.oldpp = pp
|
|
self.oldsamplenum = samplenum
|
|
self.oldpin = pin
|