##
## This file is part of the libsigrokdecode project.
##
-## Copyright (C) 2012-2014 Uwe Hermann <uwe@hermann-uwe.de>
+## Copyright (C) 2012-2016 Uwe Hermann <uwe@hermann-uwe.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
## 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
import calendar
+from common.srdhelper import bcd2int
-# Return the specified BCD number (max. 8 bits) as integer.
-def bcd2int(b):
- return (b & 0x0f) + ((b >> 4) * 10)
+class SamplerateError(Exception):
+ pass
class Decoder(srd.Decoder):
- api_version = 1
+ api_version = 3
id = 'dcf77'
name = 'DCF77'
longname = 'DCF77 time protocol'
desc = 'European longwave time signal (77.5kHz carrier signal).'
license = 'gplv2+'
inputs = ['logic']
- outputs = ['dcf77']
- probes = [
+ outputs = []
+ tags = ['Clock/timing']
+ channels = (
{'id': 'data', 'name': 'DATA', 'desc': 'DATA line'},
- ]
- optional_probes = []
- options = {}
- annotations = [
- ['start-of-minute', 'Start of minute'],
- ['special-bits', 'Special bits (civil warnings, weather forecast)'],
- ['call-bit', 'Call bit'],
- ['summer-time', 'Summer time announcement'],
- ['cest', 'CEST bit'],
- ['cet', 'CET bit'],
- ['leap-second', 'Leap second bit'],
- ['start-of-time', 'Start of encoded time'],
- ['minute', 'Minute'],
- ['minute-parity', 'Minute parity bit'],
- ['hour', 'Hour'],
- ['hour-parity', 'Hour parity bit'],
- ['day', 'Day of month'],
- ['day-of-week', 'Day of week'],
- ['month', 'Month'],
- ['year', 'Year'],
- ['date-parity', 'Date parity bit'],
- ['raw-bits', 'Raw bits'],
- ['unknown-bits', 'Unknown bits'],
- ['warnings', 'Human-readable warnings'],
- ]
+ )
+ annotations = (
+ ('start-of-minute', 'Start of minute'),
+ ('special-bits', 'Special bits (civil warnings, weather forecast)'),
+ ('call-bit', 'Call bit'),
+ ('summer-time', 'Summer time announcement'),
+ ('cest', 'CEST bit'),
+ ('cet', 'CET bit'),
+ ('leap-second', 'Leap second bit'),
+ ('start-of-time', 'Start of encoded time'),
+ ('minute', 'Minute'),
+ ('minute-parity', 'Minute parity bit'),
+ ('hour', 'Hour'),
+ ('hour-parity', 'Hour parity bit'),
+ ('day', 'Day of month'),
+ ('day-of-week', 'Day of week'),
+ ('month', 'Month'),
+ ('year', 'Year'),
+ ('date-parity', 'Date parity bit'),
+ ('raw-bits', 'Raw bits'),
+ ('unknown-bits', 'Unknown bits'),
+ ('warnings', 'Human-readable warnings'),
+ )
annotation_rows = (
('bits', 'Bits', (17, 18)),
('fields', 'Fields', tuple(range(0, 16 + 1))),
('warnings', 'Warnings', (19,)),
)
- def __init__(self, **kwargs):
+ def __init__(self):
+ self.reset()
+
+ def reset(self):
self.samplerate = None
self.state = 'WAIT FOR RISING EDGE'
- self.oldpins = None
- self.oldval = None
- self.samplenum = 0
self.ss_bit = self.ss_bit_old = self.es_bit = self.ss_block = 0
self.datebits = []
self.bitcount = 0 # Counter for the DCF77 bits (0..58)
self.dcf77_bitnumber_is_known = 0
def start(self):
- # self.out_python = self.register(srd.OUTPUT_PYTHON)
self.out_ann = self.register(srd.OUTPUT_ANN)
def metadata(self, key, value):
else:
self.tmp |= (bit << (c - 1))
if c == 14:
- s = bin(self.tmp)[2:].zfill(14)
+ s = '{:014b}'.format(self.tmp)
self.putb([1, ['Special bits: %s' % s, 'SB: %s' % s]])
elif c == 15:
s = '' if (bit == 1) else 'not '
self.tmp |= (bit << (c - 42))
if c == 44:
d = bcd2int(self.tmp)
- dn = calendar.day_name[d - 1] # day_name[0] == Monday
- self.putb([13, ['Day of week: %d (%s)' % (d, dn),
- 'DoW: %d (%s)' % (d, dn)]])
+ try:
+ dn = calendar.day_name[d - 1] # day_name[0] == Monday
+ self.putb([13, ['Day of week: %d (%s)' % (d, dn),
+ 'DoW: %d (%s)' % (d, dn)]])
+ except IndexError:
+ self.putb([19, ['Day of week: %d (%s)' % (d, 'invalid'),
+ 'DoW: %d (%s)' % (d, 'inv')]])
elif c in range(45, 49 + 1):
# Month (1-12): DCF77 bits 45-49 (BCD format).
if c == 45:
self.tmp |= (bit << (c - 45))
if c == 49:
m = bcd2int(self.tmp)
- mn = calendar.month_name[m] # month_name[1] == January
- self.putb([14, ['Month: %d (%s)' % (m, mn),
- 'Mon: %d (%s)' % (m, mn)]])
+ try:
+ mn = calendar.month_name[m] # month_name[1] == January
+ self.putb([14, ['Month: %d (%s)' % (m, mn),
+ 'Mon: %d (%s)' % (m, mn)]])
+ except IndexError:
+ self.putb([19, ['Month: %d (%s)' % (m, 'invalid'),
+ 'Mon: %d (%s)' % (m, 'inv')]])
elif c in range(50, 57 + 1):
# Year (0-99): DCF77 bits 50-57 (BCD format).
if c == 50:
# Even parity over date bits (36-58): DCF77 bit 58.
parity = self.datebits.count(1)
s = 'OK' if ((parity % 2) == 0) else 'INVALID!'
- self.putx([16, ['Date parity: %s' % s, 'DP: %s' %s]])
+ self.putx([16, ['Date parity: %s' % s, 'DP: %s' % s]])
self.datebits = []
else:
- raise Exception('Invalid DCF77 bit: %d' % c)
-
- def decode(self, ss, es, data):
- if self.samplerate is None:
- raise Exception("Cannot decode without samplerate.")
- for (self.samplenum, pins) in data:
-
- # Ignore identical samples early on (for performance reasons).
- if self.oldpins == pins:
- continue
- self.oldpins, (val,) = pins, pins
+ self.putx([19, ['Invalid DCF77 bit: %d' % c,
+ 'Invalid bit: %d' % c, 'Inv: %d' % c]])
+ def decode(self):
+ if not self.samplerate:
+ raise SamplerateError('Cannot decode without samplerate.')
+ while True:
if self.state == 'WAIT FOR RISING EDGE':
# Wait until the next rising edge occurs.
- if not (self.oldval == 0 and val == 1):
- self.oldval = val
- continue
+ self.wait({0: 'r'})
# Save the sample number where the DCF77 bit begins.
self.ss_bit = self.samplenum
elif self.state == 'GET BIT':
# Wait until the next falling edge occurs.
- if not (self.oldval == 1 and val == 0):
- self.oldval = val
- continue
+ self.wait({0: 'f'})
# Save the sample number where the DCF77 bit ends.
self.es_bit = self.samplenum
elif len_high_ms in range(161, 260 + 1):
bit = 1
else:
- bit = -1 # TODO: Error?
+ bit = -1
- # There's no bit 59, make sure none is decoded.
- if bit in (0, 1) and self.bitcount in range(0, 58 + 1):
+ if bit in (0, 1):
self.handle_dcf77_bit(bit)
self.bitcount += 1
+ else:
+ self.putx([19, ['Invalid bit timing', 'Inv timing', 'Inv']])
self.state = 'WAIT FOR RISING EDGE'
-
- else:
- raise Exception('Invalid state: %s' % self.state)
-
- self.oldval = val
-
projects / libsigrokdecode.git / blobdiff