##
## 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 data 2 of the License, or
-## (at your option) any later data.
+## 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
## 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
+## along with this program; if not, see <http://www.gnu.org/licenses/>.
##
import sigrokdecode as srd
pass
class Decoder(srd.Decoder):
- api_version = 2
+ api_version = 3
id = 'em4100'
name = 'EM4100'
longname = 'RFID EM4100'
license = 'gplv2+'
inputs = ['logic']
outputs = ['em4100']
+ tags = ['Logic', 'Wireless']
channels = (
{'id': 'data', 'name': 'Data', 'desc': 'Data line'},
)
('tags', 'Tags', (9,)),
)
- def __init__(self, **kwargs):
+ def __init__(self):
+ self.reset()
+
+ def reset(self):
self.samplerate = None
self.oldpin = None
self.last_samplenum = None
self.oldpl = 0
self.oldsamplenum = 0
self.last_bit_pos = 0
- self.first_ss = 0
+ self.ss_first = 0
self.first_one = 0
self.state = 'HEADER'
self.data = 0
self.data_bits = 0
- self.data_ss = 0
+ self.ss_data = 0
self.data_parity = 0
self.payload_cnt = 0
self.data_col_parity = [0, 0, 0, 0, 0, 0]
if self.first_one > 0:
self.first_one += 1
if self.first_one == 9:
- self.put(self.first_ss, es, self.out_ann,
+ self.put(self.ss_first, 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
+ self.ss_first = ss
if bit == 0:
self.first_one = 0
if self.state == 'PAYLOAD':
self.payload_cnt += 1
if self.data_bits == 0:
- self.data_ss = ss
+ self.ss_data = 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,
+ self.put(self.ss_data, 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 self.state == 'TRAILER':
self.payload_cnt += 1
if self.data_bits == 0:
- self.data_ss = ss
+ self.ss_data = ss
self.data = 0
self.data_parity = 0
self.data_bits += 1
# 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,
+ self.put(self.ss_first, es, self.out_ann,
[9, ['Tag: %010X' % self.tag, 'Tag', 'T']])
self.tag = 0
self.col_parity_pos = []
self.all_row_parity_ok = True
- def manchester_decode(self, samplenum, pl, pp, pin):
+ def manchester_decode(self, pl, pp, pin):
bit = self.oldpin ^ self.polarity
if pl > self.halfbit_limit:
- es = int(samplenum - pl/2)
+ es = int(self.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)
+ self.last_bit_pos = int(self.samplenum - pl/2)
else:
- es = int(samplenum)
+ es = int(self.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)
+ self.last_bit_pos = int(self.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)
+ self.last_bit_pos = int(self.samplenum)
- def decode(self, ss, es, data):
+ def decode(self):
if not self.samplerate:
raise SamplerateError('Cannot decode without samplerate.')
- for (samplenum, (pin,)) in data:
- # 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
+
+ # Initialize internal state from the very first sample.
+ (pin,) = self.wait()
+ self.oldpin = pin
+ self.last_samplenum = self.samplenum
+ self.lastlast_samplenum = self.samplenum
+ self.last_edge = self.samplenum
+ self.oldpl = 0
+ self.oldpp = 0
+ self.oldsamplenum = 0
+ self.last_bit_pos = 0
+
+ while True:
+ # Ignore identical samples, only process edges.
+ (pin,) = self.wait({0: 'e'})
+ pl = self.samplenum - self.oldsamplenum
+ pp = pin
+ self.manchester_decode(pl, pp, pin)
+ self.oldpl = pl
+ self.oldpp = pp
+ self.oldsamplenum = self.samplenum
+ self.oldpin = pin
projects / libsigrokdecode.git / blobdiff