def rc5_decode(ir_stream, carrier_freq=36.0e3, polarity=ir.IRConfig.IdleLow, logic_levels=None, \
stream_type=stream.StreamType.Samples):
'''Decode RC5 infrared protocol
This is a generator function that can be used in a pipeline of waveform
procesing operations.
ir_stream (iterable of SampleChunk objects or (float, int) pairs)
A sample stream or edge stream of IR pulses. The type of stream is identified
by the stream_type parameter. When this is a sample stream, an initial block
of data is consumed to determine the most likely logic levels in the signal.
This signal can be either modulated or demodulated.
carrier_freq (float)
The carrier frequency for modulation.
polarity (infrared.IRConfig)
Set the polarity (idle state high or low).
logic_levels ((float, float) or None)
Optional pair that indicates (low, high) logic levels of the sample
stream. When present, auto level detection is disabled. This has no effect on
edge streams.
stream_type (streaming.StreamType)
A StreamType value indicating that the ir_stream parameter represents either Samples
or Edges.
Yields a series of RC5StreamMessage objects.
Raises AutoLevelError if stream_type = Samples and the logic levels cannot
be determined.
'''
if stream_type == stream.StreamType.Samples:
if logic_levels is None:
samp_it, logic_levels = decode.check_logic_levels(ir_stream)
else:
samp_it = ir_stream
edges = decode.find_edges(samp_it, logic_levels, hysteresis=0.4)
else: # the stream is already a list of edges
edges = ir_stream
# Demodulate signal (also passes an unmodulated signal without changes)
edges = ir.demodulate(edges, carrier_freq, polarity)
pulse_width = 889.0e-6 # 889us pulse width
es = decode.EdgeSequence(edges, pulse_width)
while not es.at_end():
# Look for the rising edge of a pulse
if es.cur_state() == 0:
es.advance_to_edge() # Now we're 1
msg_start_time = es.cur_time - pulse_width
# Move ahead half a pulse and check that we are still 1
es.advance(pulse_width / 2.0)
if es.cur_state() != 1:
continue
# Advance through edge sequence recording state until we see 3 0's or 3 1's in a row
# This indicates a break in the Manchester encoding.
coded_bits = [0, 1]
bit_starts = [0.0, 0.0]
same_count = 1
prev_state = 1
while True:
es.advance()
coded_bits.append(es.cur_state())
bit_starts.append(es.cur_time - pulse_width / 2.0)
if es.cur_state() == prev_state:
same_count += 1
else:
same_count = 1
if same_count > 2:
break
prev_state = es.cur_state()
msg_end_time = es.cur_time - pulse_width
if len(coded_bits) >= 14 * 2:
# Decode Manchester
# The second bit of each pair is the same as the decoded bit
msg_bits = coded_bits[1:28:2]
mb_starts = bit_starts[::2]
#print('$$$ coded_bits:', coded_bits)
#print('$$$ msg_bits:', msg_bits)
toggle = msg_bits[2]
addr = join_bits(msg_bits[3:8])
cmd = join_bits([0 if msg_bits[1] else 1] + msg_bits[8:14])
msg = RC5Message(cmd, addr, toggle)
sm = RC5StreamMessage((msg_start_time, msg_end_time), msg)
sm.annotate('frame', {'name': 'frame'},
stream.AnnotationFormat.Hidden)
sm.subrecords.append(
stream.StreamSegment((mb_starts[2], mb_starts[3]),
toggle,
kind='toggle'))
sm.subrecords[-1].annotate('data', {'_bits': 1},
stream.AnnotationFormat.Int)
sm.subrecords.append(
stream.StreamSegment((mb_starts[3], mb_starts[8]),
addr,
kind='addr'))
sm.subrecords[-1].annotate('addr', {'_bits': 5})
sm.subrecords.append(
stream.StreamSegment((mb_starts[8], mb_starts[14]),
cmd,
kind='cmd'))
sm.subrecords[-1].annotate('data', {'_bits': 6})
if cmd > 63:
# Extended format; 7-th bit is just after first start bit
sm.subrecords[-1].fields['_bits'] = 7
sm.subrecords.append(
stream.StreamSegment((mb_starts[1], mb_starts[2]),
msg_bits[1],
kind='cmd bit-7'))
sm.subrecords[-1].annotate('data1', {'_bits': 1},
stream.AnnotationFormat.Int)
yield sm
def rc6_decode(ir_stream, carrier_freq=36.0e3, polarity=ir.IRConfig.IdleLow, logic_levels=None, \
stream_type=stream.StreamType.Samples):
'''Decode RC6 infrared protocol
This is a generator function that can be used in a pipeline of waveform
procesing operations.
ir_stream (iterable of SampleChunk objects or (float, int) pairs)
A sample stream or edge stream of IR pulses. The type of stream is identified
by the stream_type parameter. When this is a sample stream, an initial block
of data is consumed to determine the most likely logic levels in the signal.
This signal can be either modulated or demodulated.
carrier_freq (float)
The carrier frequency for modulation.
polarity (infrared.IRConfig)
Set the polarity (idle state high or low).
logic_levels ((float, float) or None)
Optional pair that indicates (low, high) logic levels of the sample
stream. When present, auto level detection is disabled. This has no effect on
edge streams.
stream_type (streaming.StreamType)
A StreamType value indicating that the ir_stream parameter represents either Samples
or Edges.
Yields a series of RC6StreamMessage objects.
Raises AutoLevelError if stream_type = Samples and the logic levels cannot
be determined.
'''
if stream_type == stream.StreamType.Samples:
if logic_levels is None:
samp_it, logic_levels = decode.check_logic_levels(ir_stream)
else:
samp_it = ir_stream
edges = decode.find_edges(samp_it, logic_levels, hysteresis=0.4)
else: # the stream is already a list of edges
edges = ir_stream
# Demodulate signal (also passes an unmodulated signal without changes)
edges = ir.demodulate(edges, carrier_freq, polarity)
pulse_width = 444.0e-6 # 444us pulse width
es = decode.EdgeSequence(edges, pulse_width)
epsilon = 30.0e-6 # allow +/-30us variation for pulses and bit times
time_is_nearly = functools.partial(ir.time_is_nearly, epsilon=epsilon)
while not es.at_end():
# Look for the rising edge of a pulse
if es.cur_state() == 0:
es.advance_to_edge() # Now we're 1
msg_start_time = es.cur_time
ts = es.advance_to_edge()
if not time_is_nearly(ts, 6 * pulse_width):
continue # This is not the leading AGC pulse of a message
ts = es.advance_to_edge()
if not time_is_nearly(ts, 2 * pulse_width):
continue # This is not the leading AGC pulse of a message
# Move ahead half a pulse and check that we are still 1
es.advance(pulse_width / 2.0)
if es.cur_state() != 1:
continue # Not a valid start bit
es.advance() # End of start bit
# Advance through edge sequence recording state until we see 4 0's or 4 1's in a row
# This indicates a break in the Manchester encoding.
coded_bits = [1, 0] # Start bit
bit_starts = [0.0, 0.0]
same_count = 1
prev_state = 1
while True:
es.advance()
coded_bits.append(es.cur_state())
bit_starts.append(es.cur_time - pulse_width / 2.0)
if es.cur_state() == prev_state:
same_count += 1
else:
same_count = 1
if same_count > 3:
break
prev_state = es.cur_state()
msg_end_time = es.cur_time - 2.5 * pulse_width
#print('$$$ found bits:', len(coded_bits))
if len(coded_bits) >= 22 * 2:
# Decode Manchester
# The first bit of each pair is the same as the decoded bit
msg_bits = coded_bits[0:44:2]
mb_starts = bit_starts[::2]
mode = join_bits(msg_bits[1:4])
toggle = msg_bits[4]
if mode == 6: # RC6A message
if msg_bits[6]: # 15-bit customer field
msg_bits = coded_bits[0:76:2]
customer = join_bits(msg_bits[7:22])
asb = 22 # addr start bit index
else: # 7-bit customer field
msg_bits = coded_bits[0:60:2]
customer = join_bits(msg_bits[7:14])
asb = 14
else: # RC6 message
customer = None
asb = 6
#print('$$$ coded_bits:', coded_bits)
#print('$$$ msg_bits:', msg_bits)
addr = join_bits(msg_bits[asb:asb+8])
cmd = join_bits(msg_bits[asb+8:asb+16])
msg = RC6Message(cmd, addr, toggle, mode, customer)
sm = RC6StreamMessage((msg_start_time, msg_end_time), msg)
sm.annotate('frame', {'name':'frame'}, stream.AnnotationFormat.Hidden)
sm.subrecords.append(stream.StreamSegment((mb_starts[1], mb_starts[4]), mode, kind='mode'))
sm.subrecords[-1].annotate('addr', {'_bits':3})
sm.subrecords.append(stream.StreamSegment((mb_starts[4], mb_starts[6]), toggle, kind='toggle'))
sm.subrecords[-1].annotate('data', {'_bits':1}, stream.AnnotationFormat.Int)
if mode == 6:
sm.subrecords.append(stream.StreamSegment((mb_starts[6], mb_starts[asb]), customer, kind='customer'))
sm.subrecords[-1].annotate('data', {'_bits':7 + msg_bits[6]*8})
sm.subrecords.append(stream.StreamSegment((mb_starts[asb], mb_starts[asb+8]), addr, kind='addr'))
sm.subrecords[-1].annotate('addr', {'_bits':8})
sm.subrecords.append(stream.StreamSegment((mb_starts[asb+8], mb_starts[asb+16]), cmd, kind='cmd'))
sm.subrecords[-1].annotate('data', {'_bits':8})
yield sm
def rc5_decode(ir_stream, carrier_freq=36.0e3, polarity=ir.IRConfig.IdleLow, logic_levels=None, \
stream_type=stream.StreamType.Samples):
'''Decode RC5 infrared protocol
This is a generator function that can be used in a pipeline of waveform
procesing operations.
ir_stream (iterable of SampleChunk objects or (float, int) pairs)
A sample stream or edge stream of IR pulses. The type of stream is identified
by the stream_type parameter. When this is a sample stream, an initial block
of data is consumed to determine the most likely logic levels in the signal.
This signal can be either modulated or demodulated.
carrier_freq (float)
The carrier frequency for modulation.
polarity (infrared.IRConfig)
Set the polarity (idle state high or low).
logic_levels ((float, float) or None)
Optional pair that indicates (low, high) logic levels of the sample
stream. When present, auto level detection is disabled. This has no effect on
edge streams.
stream_type (streaming.StreamType)
A StreamType value indicating that the ir_stream parameter represents either Samples
or Edges.
Yields a series of RC5StreamMessage objects.
Raises AutoLevelError if stream_type = Samples and the logic levels cannot
be determined.
'''
if stream_type == stream.StreamType.Samples:
if logic_levels is None:
samp_it, logic_levels = decode.check_logic_levels(ir_stream)
else:
samp_it = ir_stream
edges = decode.find_edges(samp_it, logic_levels, hysteresis=0.4)
else: # the stream is already a list of edges
edges = ir_stream
# Demodulate signal (also passes an unmodulated signal without changes)
edges = ir.demodulate(edges, carrier_freq, polarity)
pulse_width = 889.0e-6 # 889us pulse width
es = decode.EdgeSequence(edges, pulse_width)
while not es.at_end():
# Look for the rising edge of a pulse
if es.cur_state() == 0:
es.advance_to_edge() # Now we're 1
msg_start_time = es.cur_time - pulse_width
# Move ahead half a pulse and check that we are still 1
es.advance(pulse_width / 2.0)
if es.cur_state() != 1:
continue
# Advance through edge sequence recording state until we see 3 0's or 3 1's in a row
# This indicates a break in the Manchester encoding.
coded_bits = [0, 1]
bit_starts = [0.0, 0.0]
same_count = 1
prev_state = 1
while True:
es.advance()
coded_bits.append(es.cur_state())
bit_starts.append(es.cur_time - pulse_width / 2.0)
if es.cur_state() == prev_state:
same_count += 1
else:
same_count = 1
if same_count > 2:
break
prev_state = es.cur_state()
msg_end_time = es.cur_time - pulse_width
if len(coded_bits) >= 14 * 2:
# Decode Manchester
# The second bit of each pair is the same as the decoded bit
msg_bits = coded_bits[1:28:2]
mb_starts = bit_starts[::2]
#print('$$$ coded_bits:', coded_bits)
#print('$$$ msg_bits:', msg_bits)
toggle = msg_bits[2]
addr = join_bits(msg_bits[3:8])
cmd = join_bits([0 if msg_bits[1] else 1] + msg_bits[8:14])
msg = RC5Message(cmd, addr, toggle)
sm = RC5StreamMessage((msg_start_time, msg_end_time), msg)
sm.annotate('frame', {'name':'frame'}, stream.AnnotationFormat.Hidden)
sm.subrecords.append(stream.StreamSegment((mb_starts[2], mb_starts[3]), toggle, kind='toggle'))
sm.subrecords[-1].annotate('data', {'_bits':1}, stream.AnnotationFormat.Int)
sm.subrecords.append(stream.StreamSegment((mb_starts[3], mb_starts[8]), addr, kind='addr'))
sm.subrecords[-1].annotate('addr', {'_bits':5})
sm.subrecords.append(stream.StreamSegment((mb_starts[8], mb_starts[14]), cmd, kind='cmd'))
sm.subrecords[-1].annotate('data', {'_bits':6})
if cmd > 63:
# Extended format; 7-th bit is just after first start bit
sm.subrecords[-1].fields['_bits'] = 7
sm.subrecords.append(stream.StreamSegment((mb_starts[1], mb_starts[2]), msg_bits[1], kind='cmd bit-7'))
sm.subrecords[-1].annotate('data1', {'_bits':1}, stream.AnnotationFormat.Int)
yield sm
def nec_decode(ir_stream, carrier_freq=38.0e3, polarity=ir.IRConfig.IdleLow, logic_levels=None, \
stream_type=stream.StreamType.Samples):
'''Decode NEC infrared protocol
This is a generator function that can be used in a pipeline of waveform
procesing operations.
ir_stream (iterable of SampleChunk objects or (float, int) pairs)
A sample stream or edge stream of IR pulses. The type of stream is identified
by the stream_type parameter. When this is a sample stream, an initial block
of data is consumed to determine the most likely logic levels in the signal.
This signal can be either modulated or demodulated.
carrier_freq (float)
The carrier frequency for modulation.
polarity (infrared.IRConfig)
Set the polarity (idle state high or low).
logic_levels ((float, float) or None)
Optional pair that indicates (low, high) logic levels of the sample
stream. When present, auto level detection is disabled. This has no effect on
edge streams.
stream_type (streaming.StreamType)
A StreamType value indicating that the ir_stream parameter represents either Samples
or Edges.
Yields a series of NECStreamMessage objects.
Raises AutoLevelError if stream_type = Samples and the logic levels cannot
be determined.
'''
if stream_type == stream.StreamType.Samples:
if logic_levels is None:
samp_it, logic_levels = decode.check_logic_levels(ir_stream)
else:
samp_it = ir_stream
edges = decode.find_edges(samp_it, logic_levels, hysteresis=0.4)
else: # the stream is already a list of edges
edges = ir_stream
# Demodulate signal (also passes an unmodulated signal without changes)
edges = ir.demodulate(edges, carrier_freq, polarity)
mod_period = (1.0 / carrier_freq) # Not really important. Just need a default value to pass to EdgeSequence
es = decode.EdgeSequence(edges, mod_period)
epsilon = 30.0e-6 # Allow +/-30us variation for pulses and bit times
time_is_nearly = functools.partial(ir.time_is_nearly, epsilon=epsilon)
time_is_at_least = functools.partial(ir.time_is_at_least, epsilon=epsilon)
while not es.at_end():
# Look for the falling edge of an AGC burst
if es.cur_state() == 0:
es.advance_to_edge() # Now we're 1
es.advance_to_edge() # Now we're 0. Could be end of AGC
ts = es.advance_to_edge() # Start of next pulse
# Measure the time we skipped forward by
if time_is_nearly(ts, 2.25e-3) or time_is_nearly(ts, 4.5e-3):
# Previous pulse was AGC (gap between 2.25ms and 4.5ms)
msg_start_time = es.cur_time - ts - 9.0e-3
if time_is_at_least(ts, 4.5e-3): # command message
msg_bits = []
bit_starts = []
while len(msg_bits) < 32:
bit_start_time = es.cur_time
ts = es.advance_to_edge()
if time_is_nearly(ts, 560.0e-6): # 560us bit pulse time
# Measure next time gap to determine if bit is 1 or 0
ts = es.advance_to_edge()
bit_period = es.cur_time - bit_start_time
if time_is_nearly(bit_period, 2.25e-3): # 1-bit
msg_bits.append(1)
bit_starts.append(bit_start_time)
if time_is_nearly(bit_period, 1.12e-3): # 0-bit
msg_bits.append(0)
bit_starts.append(bit_start_time)
else:
break
if len(msg_bits) == 32:
bit_starts.append(es.cur_time) # End of last byte
# Check for the stop bit
ts = es.advance_to_edge()
if time_is_nearly(ts, 560.0e-6): # 560us stop pulse time
# Valid command message
msg_bytes = [join_bits(reversed(msg_bits[i:i+8])) for i in xrange(0, 32, 8)]
m_bounds = [(bit_starts[i], bit_starts[i+8]) for i in xrange(0, 32, 8)]
addr_low = msg_bytes[0]
addr_high = msg_bytes[1]
cmd = msg_bytes[2]
cmd_inv = msg_bytes[3]
nec_msg = NECMessage(cmd, addr_low, addr_high, cmd_inv)
sm = NECStreamMessage((msg_start_time, es.cur_time), nec_msg)
sm.annotate('frame', {}, stream.AnnotationFormat.Hidden)
sm.subrecords.append(stream.StreamSegment((m_bounds[0][0], m_bounds[0][1]), addr_low, kind='addr-low'))
sm.subrecords[-1].annotate('addr', {'_bits':8})
sm.subrecords.append(stream.StreamSegment((m_bounds[1][0], m_bounds[1][1]), addr_high, kind='addr-high'))
sm.subrecords[-1].annotate('addr', {'_bits':8})
sm.subrecords.append(stream.StreamSegment((m_bounds[2][0], m_bounds[2][1]), cmd, kind='cmd'))
sm.subrecords[-1].annotate('data', {'_bits':8})
status = stream.StreamStatus.Ok if cmd == (~cmd_inv) & 0xFF else stream.StreamStatus.Error
sm.subrecords.append(stream.StreamSegment((m_bounds[3][0], m_bounds[3][1]), cmd_inv, kind='cmd-inv', status=status))
sm.subrecords[-1].annotate('check', {'_bits':8})
yield sm
else: # repeat message
# Check for the stop bit
ts = es.advance_to_edge()
if time_is_nearly(ts, 560.0e-6): # 560us stop pulse time
# Valid repeat message
sm = NECStreamMessage((msg_start_time, es.cur_time), NECRepeat())
sm.annotate('frame', {'name':''}, stream.AnnotationFormat.String)
yield sm
def sirc_decode(ir_stream, carrier_freq=40.0e3, polarity=ir.IRConfig.IdleLow, logic_levels=None, \
stream_type=stream.StreamType.Samples):
'''Decode Sony SIRC infrared protocol
This is a generator function that can be used in a pipeline of waveform
procesing operations.
ir_stream (iterable of SampleChunk objects or (float, int) pairs)
A sample stream or edge stream of IR pulses. The type of stream is identified
by the stream_type parameter. When this is a sample stream, an initial block
of data is consumed to determine the most likely logic levels in the signal.
This signal can be either modulated or demodulated.
carrier_freq (float)
The carrier frequency for modulation.
polarity (infrared.IRConfig)
Set the polarity (idle state high or low).
logic_levels ((float, float) or None)
Optional pair that indicates (low, high) logic levels of the sample
stream. When present, auto level detection is disabled. This has no effect on
edge streams.
stream_type (streaming.StreamType)
A StreamType value indicating that the ir_stream parameter represents either Samples
or Edges.
Yields a series of SIRCStreamMessage objects.
Raises AutoLevelError if stream_type = Samples and the logic levels cannot
be determined.
'''
if stream_type == stream.StreamType.Samples:
if logic_levels is None:
samp_it, logic_levels = decode.check_logic_levels(ir_stream)
else:
samp_it = ir_stream
edges = decode.find_edges(samp_it, logic_levels, hysteresis=0.4)
else: # the stream is already a list of edges
edges = ir_stream
# Demodulate signal (also passes an unmodulated signal without changes)
edges = ir.demodulate(edges, carrier_freq, polarity)
mod_period = (1.0 / carrier_freq) # Not really important. Just need a default value to pass to EdgeSequence
es = decode.EdgeSequence(edges, mod_period)
epsilon = 30.0e-6 # allow +/-30us variation for pulses and bit times
time_is_nearly = functools.partial(ir.time_is_nearly, epsilon=epsilon)
one_t = 600.0e-6 # 600us 1T time
while not es.at_end():
# Look for the falling edge of a start pulse
if es.cur_state() == 0:
es.advance_to_edge() # Now we're 1
ts = es.advance_to_edge() # Now we're 0. Could be end of start pulse
# Measure the time we skipped forward by
if not time_is_nearly(ts, 4 * one_t):
continue # Not a start pulse
msg_start_time = es.cur_time - ts
msg_bits = []
bit_starts = []
prev_edge = 0.0
# Accumulate bits until idle for too long
while True:
prev_edge = es.cur_time
ts = es.advance_to_edge()
if not time_is_nearly(ts, one_t):
break # Not the beginning of a bit
bit_starts.append(es.cur_time - ts)
ts = es.advance_to_edge()
if time_is_nearly(ts, one_t): # 0-bit
msg_bits.append(0)
elif time_is_nearly(ts, 2 * one_t): #1-bit
msg_bits.append(1)
else:
break
bit_starts.append(prev_edge) # End of last bit
#print('### last bit:', es.cur_time)
if len(msg_bits) in (12, 15, 20):
cmd = join_bits(reversed(msg_bits[0:7]))
cmd_range = (bit_starts[0], bit_starts[7])
if len(msg_bits) == 12 or len(msg_bits) == 20:
device = join_bits(reversed(msg_bits[7:12]))
device_range = (bit_starts[7], bit_starts[12])
else: # 15-bit command
device = join_bits(reversed(msg_bits[7:15]))
device_range = (bit_starts[7], bit_starts[15])
extended = None
if len(msg_bits) == 20: # 20-bit extended format
extended = join_bits(reversed(msg_bits[12:20]))
extended_range = (bit_starts[12], bit_starts[20])
msg = SIRCMessage(cmd, device, extended)
sm = SIRCStreamMessage((msg_start_time, prev_edge + 0.5*one_t), msg)
sm.annotate('frame', {}, stream.AnnotationFormat.Hidden)
cmd_ss = stream.StreamSegment((cmd_range[0], cmd_range[1]), cmd, kind='command')
sm.subrecords.append(cmd_ss)
sm.subrecords[-1].annotate('data', {'_bits':7})
dev_ss = stream.StreamSegment((device_range[0], device_range[1]), device, kind='device')
sm.subrecords.append(dev_ss)
sm.subrecords[-1].annotate('addr')
if len(msg_bits) == 15:
sm.subrecords[-1].fields['_bits'] = 8
else:
sm.subrecords[-1].fields['_bits'] = 5
if extended is not None:
ext_ss = stream.StreamSegment((extended_range[0], extended_range[1]), extended, kind='extended')
sm.subrecords.append(ext_ss)
sm.subrecords[-1].annotate('data', {'_bits':8})
yield sm
def nec_decode(ir_stream, carrier_freq=38.0e3, polarity=ir.IRConfig.IdleLow, logic_levels=None, \
stream_type=stream.StreamType.Samples):
'''Decode NEC infrared protocol
This is a generator function that can be used in a pipeline of waveform
procesing operations.
ir_stream (iterable of SampleChunk objects or (float, int) pairs)
A sample stream or edge stream of IR pulses. The type of stream is identified
by the stream_type parameter. When this is a sample stream, an initial block
of data is consumed to determine the most likely logic levels in the signal.
This signal can be either modulated or demodulated.
carrier_freq (float)
The carrier frequency for modulation.
polarity (infrared.IRConfig)
Set the polarity (idle state high or low).
logic_levels ((float, float) or None)
Optional pair that indicates (low, high) logic levels of the sample
stream. When present, auto level detection is disabled. This has no effect on
edge streams.
stream_type (streaming.StreamType)
A StreamType value indicating that the ir_stream parameter represents either Samples
or Edges.
Yields a series of NECStreamMessage objects.
Raises AutoLevelError if stream_type = Samples and the logic levels cannot
be determined.
'''
if stream_type == stream.StreamType.Samples:
if logic_levels is None:
samp_it, logic_levels = decode.check_logic_levels(ir_stream)
else:
samp_it = ir_stream
edges = decode.find_edges(samp_it, logic_levels, hysteresis=0.4)
else: # the stream is already a list of edges
edges = ir_stream
# Demodulate signal (also passes an unmodulated signal without changes)
edges = ir.demodulate(edges, carrier_freq, polarity)
mod_period = (
1.0 / carrier_freq
) # Not really important. Just need a default value to pass to EdgeSequence
es = decode.EdgeSequence(edges, mod_period)
epsilon = 30.0e-6 # Allow +/-30us variation for pulses and bit times
time_is_nearly = functools.partial(ir.time_is_nearly, epsilon=epsilon)
time_is_at_least = functools.partial(ir.time_is_at_least, epsilon=epsilon)
while not es.at_end():
# Look for the falling edge of an AGC burst
if es.cur_state() == 0:
es.advance_to_edge() # Now we're 1
es.advance_to_edge() # Now we're 0. Could be end of AGC
ts = es.advance_to_edge() # Start of next pulse
# Measure the time we skipped forward by
if time_is_nearly(ts, 2.25e-3) or time_is_nearly(ts, 4.5e-3):
# Previous pulse was AGC (gap between 2.25ms and 4.5ms)
msg_start_time = es.cur_time - ts - 9.0e-3
if time_is_at_least(ts, 4.5e-3): # command message
msg_bits = []
bit_starts = []
while len(msg_bits) < 32:
bit_start_time = es.cur_time
ts = es.advance_to_edge()
if time_is_nearly(ts, 560.0e-6): # 560us bit pulse time
# Measure next time gap to determine if bit is 1 or 0
ts = es.advance_to_edge()
bit_period = es.cur_time - bit_start_time
if time_is_nearly(bit_period, 2.25e-3): # 1-bit
msg_bits.append(1)
bit_starts.append(bit_start_time)
if time_is_nearly(bit_period, 1.12e-3): # 0-bit
msg_bits.append(0)
bit_starts.append(bit_start_time)
else:
break
if len(msg_bits) == 32:
bit_starts.append(es.cur_time) # End of last byte
# Check for the stop bit
ts = es.advance_to_edge()
if time_is_nearly(ts, 560.0e-6): # 560us stop pulse time
# Valid command message
msg_bytes = [
join_bits(reversed(msg_bits[i:i + 8]))
for i in xrange(0, 32, 8)
]
m_bounds = [(bit_starts[i], bit_starts[i + 8])
for i in xrange(0, 32, 8)]
addr_low = msg_bytes[0]
addr_high = msg_bytes[1]
cmd = msg_bytes[2]
cmd_inv = msg_bytes[3]
nec_msg = NECMessage(cmd, addr_low, addr_high, cmd_inv)
sm = NECStreamMessage((msg_start_time, es.cur_time),
nec_msg)
sm.annotate('frame', {},
stream.AnnotationFormat.Hidden)
sm.subrecords.append(
stream.StreamSegment(
(m_bounds[0][0], m_bounds[0][1]),
addr_low,
kind='addr-low'))
sm.subrecords[-1].annotate('addr', {'_bits': 8})
sm.subrecords.append(
stream.StreamSegment(
(m_bounds[1][0], m_bounds[1][1]),
addr_high,
kind='addr-high'))
sm.subrecords[-1].annotate('addr', {'_bits': 8})
sm.subrecords.append(
stream.StreamSegment(
(m_bounds[2][0], m_bounds[2][1]),
cmd,
kind='cmd'))
sm.subrecords[-1].annotate('data', {'_bits': 8})
status = stream.StreamStatus.Ok if cmd == (
~cmd_inv) & 0xFF else stream.StreamStatus.Error
sm.subrecords.append(
stream.StreamSegment(
(m_bounds[3][0], m_bounds[3][1]),
cmd_inv,
kind='cmd-inv',
status=status))
sm.subrecords[-1].annotate('check', {'_bits': 8})
yield sm
else: # repeat message
# Check for the stop bit
ts = es.advance_to_edge()
if time_is_nearly(ts, 560.0e-6): # 560us stop pulse time
# Valid repeat message
sm = NECStreamMessage((msg_start_time, es.cur_time),
NECRepeat())
sm.annotate('frame', {'name': ''},
stream.AnnotationFormat.String)
yield sm
