]
def __init__(self, **kwargs):
+ 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, metadata):
- self.samplerate = metadata['samplerate']
- # self.out_proto = self.add(srd.OUTPUT_PROTO, 'dcf77')
- self.out_ann = self.add(srd.OUTPUT_ANN, 'dcf77')
+ def start(self):
+ # self.out_proto = self.register(srd.OUTPUT_PYTHON)
+ self.out_ann = self.register(srd.OUTPUT_ANN)
- def report(self):
- pass
+ def metadata(self, key, value):
+ if key == srd.SRD_CONF_SAMPLERATE:
+ self.samplerate = value
def putx(self, data):
# Annotation for a single DCF77 bit.
if not self.dcf77_bitnumber_is_known:
return
+ # Collect bits 36-58, we'll need them for a parity check later.
+ if c in range(36, 58 + 1):
+ self.datebits.append(bit)
+
# Output specific "decoded" annotations for the respective DCF77 bits.
if c == 0:
# Start of minute: DCF bit 0.
self.putb([15, ['Year: %d' % bcd2int(self.tmp)]])
elif c == 58:
# Even parity over date bits (36-58): DCF77 bit 58.
- self.tmp |= (bit << (c - 50))
- parity = bin(self.tmp).count('1')
+ parity = self.datebits.count(1)
s = 'OK' if ((parity % 2) == 0) else 'INVALID!'
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).