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live_decoder.grc
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live_decoder.grc
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<?xml version='1.0' encoding='utf-8'?>
<?grc format='1' created='3.7.11'?>
<flow_graph>
<timestamp>Sat Nov 18 11:48:46 2017</timestamp>
<block>
<key>options</key>
<param>
<key>author</key>
<value></value>
</param>
<param>
<key>window_size</key>
<value></value>
</param>
<param>
<key>category</key>
<value>[GRC Hier Blocks]</value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>description</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(8, 8)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>generate_options</key>
<value>qt_gui</value>
</param>
<param>
<key>hier_block_src_path</key>
<value>.:</value>
</param>
<param>
<key>id</key>
<value>top_block</value>
</param>
<param>
<key>max_nouts</key>
<value>0</value>
</param>
<param>
<key>qt_qss_theme</key>
<value></value>
</param>
<param>
<key>realtime_scheduling</key>
<value></value>
</param>
<param>
<key>run_command</key>
<value>{python} -u {filename}</value>
</param>
<param>
<key>run_options</key>
<value>prompt</value>
</param>
<param>
<key>run</key>
<value>True</value>
</param>
<param>
<key>thread_safe_setters</key>
<value></value>
</param>
<param>
<key>title</key>
<value></value>
</param>
</block>
<block>
<key>variable</key>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(264, 236)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>cutoff</value>
</param>
<param>
<key>value</key>
<value>20e3</value>
</param>
</block>
<block>
<key>variable</key>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
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<value>(8, 220)</value>
</param>
<param>
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<value>0</value>
</param>
<param>
<key>id</key>
<value>freq</value>
</param>
<param>
<key>value</key>
<value>433.964e6</value>
</param>
</block>
<block>
<key>variable_qtgui_range</key>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>value</key>
<value>50</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(648, 240)</value>
</param>
<param>
<key>gui_hint</key>
<value></value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>gain</value>
</param>
<param>
<key>label</key>
<value></value>
</param>
<param>
<key>min_len</key>
<value>200</value>
</param>
<param>
<key>orient</key>
<value>Qt.Horizontal</value>
</param>
<param>
<key>start</key>
<value>1</value>
</param>
<param>
<key>step</key>
<value>1</value>
</param>
<param>
<key>stop</key>
<value>200</value>
</param>
<param>
<key>rangeType</key>
<value>float</value>
</param>
<param>
<key>widget</key>
<value>counter_slider</value>
</param>
</block>
<block>
<key>variable</key>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(8, 160)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>samp_rate</value>
</param>
<param>
<key>value</key>
<value>2e6</value>
</param>
</block>
<block>
<key>variable</key>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(672, 500)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>subsampling</value>
</param>
<param>
<key>value</key>
<value>100</value>
</param>
</block>
<block>
<key>blocks_add_const_vxx</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>const</key>
<value>-0.5</value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(1088, 348)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>blocks_add_const_vxx_0</value>
</param>
<param>
<key>type</key>
<value>float</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
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<key>minoutbuf</key>
<value>0</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<block>
<key>blocks_complex_to_mag_squared</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>_coordinate</key>
<value>(464, 352)</value>
</param>
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<key>_rotation</key>
<value>0</value>
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<param>
<key>id</key>
<value>blocks_complex_to_mag_squared_0</value>
</param>
<param>
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<value>0</value>
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<key>minoutbuf</key>
<value>0</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<block>
<key>blocks_file_sink</key>
<param>
<key>append</key>
<value>False</value>
</param>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>0</value>
</param>
<param>
<key>file</key>
<value>/home/henry/sdr/sdr/TS33C/TS33C_samples.dat</value>
</param>
<param>
<key>_coordinate</key>
<value>(864, 700)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>blocks_file_sink_1</value>
</param>
<param>
<key>type</key>
<value>byte</value>
</param>
<param>
<key>unbuffered</key>
<value>False</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<block>
<key>blocks_keep_one_in_n</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>_coordinate</key>
<value>(672, 564)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>blocks_keep_one_in_n_0</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
<param>
<key>n</key>
<value>subsampling</value>
</param>
<param>
<key>type</key>
<value>byte</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<block>
<key>blocks_multiply_const_vxx</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>const</key>
<value>gain</value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(648, 348)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>blocks_multiply_const_vxx_0_0</value>
</param>
<param>
<key>type</key>
<value>float</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<block>
<key>blocks_threshold_ff</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(856, 332)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>high</key>
<value>.150</value>
</param>
<param>
<key>id</key>
<value>blocks_threshold_ff_0</value>
</param>
<param>
<key>init</key>
<value>0</value>
</param>
<param>
<key>low</key>
<value>.05</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
</block>
<block>
<key>blocks_wavfile_sink</key>
<param>
<key>bits_per_sample</key>
<value>8</value>
</param>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>0</value>
</param>
<param>
<key>file</key>
<value>/home/henry/sdr/sdr/TS33C/TS33C_bitstream.wav</value>
</param>
<param>
<key>_coordinate</key>
<value>(1056, 196)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>blocks_wavfile_sink_0</value>
</param>
<param>
<key>nchan</key>
<value>1</value>
</param>
<param>
<key>samp_rate</key>
<value>int(samp_rate/1)</value>
</param>
</block>
<block>
<key>epy_block</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>_io_cache</key>
<value>('Decoder Block', 'blk', [('sample_rate', '20000'), ('debug_level', '0')], [('0', 'byte', 1)], [('0', 'float', 1), ('1', 'float', 1)], 'Embedded Python Block example - a simple multiply const', ['debug_level', 'sample_rate'])</value>
</param>
<param>
<key>_source_code</key>
<value># -*- coding: utf-8 -*-
"""
Embedded Python Blocks:
Each time this file is saved, GRC will instantiate the first class it finds
to get ports and parameters of your block. The arguments to __init__ will
be the parameters. All of them are required to have default values!
"""
import numpy as np
from gnuradio import gr
import pmt
ERROR = 1
INFO = 2
TRACE = 3
class blk(gr.sync_block): # other base classes are basic_block, decim_block, interp_block
"""Embedded Python Block example - a simple multiply const"""
def __init__(self, sample_rate=20000 , debug_level=0): # only default arguments here
"""arguments to this function show up as parameters in GRC"""
gr.sync_block.__init__(
self,
name='Decoder Block', # will show up in GRC
in_sig=[np.byte],
out_sig=[np.float32, np.float32]
)
# if an attribute with the same name as a parameter is found,
# a callback is registered (properties work, too).
self.debug_level = debug_level
self.sample_rate = sample_rate
self.state = "idle"
self.chunk_id = 0
self.pulse_short_limit = 775 # default value for maximum length of a short bit in µs (valid for optimal rx quality)
self.gap_short_limit = 775 # default value for maximum length of a short bit in µs (valid for optimal rx quality)
self.reset_limit = 2*self.gap_short_limit
self.currentSymbols = np.empty(0, dtype=np.uint8)
self.rawBuffer = np.empty(0, dtype=np.uint8)
self.currentSymbolType = 0
self.previousSymbolType = 0
self.temperature = 0
self.humidity = 0
def debug(self, message, level=0):
if self.debug_level >= level:
print message
def work(self, input_items, output_items):
"""example: decode TS33C"""
rawChunk = input_items[0]
self.rawBuffer = np.append(self.rawBuffer, rawChunk)
# we need at least as many samples as is defined by reset_limi
if self.rawBuffer.size*1e6/self.sample_rate > self.reset_limit:
# skip empty or zero-only chunks
if (self.rawBuffer.size > 0) and ((np.sum(self.rawBuffer) > 0) or (self.currentSymbols.size > 0)):
self.currentSymbolType = self.rawBuffer[0]
self.debug(("first raw sample", self.rawBuffer[0]), TRACE)
self.debug(("last raw sample", self.rawBuffer[-1]), TRACE)
# force edge at beginning an end of rawBuffer
self.rawBuffer = np.insert(self.rawBuffer, 0, [1 - self.rawBuffer[0]])
self.rawBuffer = np.append(self.rawBuffer, [1 - self.rawBuffer[-1]])
self.chunk_id += 1
self.debug(("Chunk", self.chunk_id), TRACE)
#self.debug("rawBuffer", rawBuffer.size, rawBuffer)
# calculate edges from raw data; insert one at beginning for sync
edges = np.insert(np.diff(self.rawBuffer), 0, [0])
# position (offset) of edges
edge_positions = np.ravel(np.nonzero(edges))
self.debug(("edge_positions:", edge_positions), TRACE)
self.debug(("edges", edges[np.nonzero(edges)]), TRACE)
if edge_positions.size > 0:
# lengths of pulses and pauses are our symbols, convert to µs
symbols = np.diff(edge_positions)*1e6/self.sample_rate
# split symbols at packet boundary
symbols = np.array(np.split(symbols, np.ravel(np.where(symbols > self.reset_limit))+1))
self.debug(("Symbols:", symbols.size, symbols), TRACE)
self.debug(("symbols.shape", symbols.shape[0]), TRACE)
self.debug(("state", self.state), TRACE)
if symbols.shape[0] > 1:
self.state = "frame"
# process all parts separately
for symbol_chunk in symbols:
self.debug(("state", self.state), TRACE)
if (symbols.size == 1) or self.state == "idle":
# skip leading inter-frame gap
symbol_chunk = symbol_chunk[1::]
if symbol_chunk.size > 0:
self.debug(("symbol_chunk:", symbol_chunk.size, symbol_chunk), TRACE)
self.state = "frame"
# add first symbol to last from previous to reassemble separated pulses/gaps
if (self.currentSymbols.size > 0) and (self.previousSymbolType == self.currentSymbolType):
self.currentSymbols[-1] += symbol_chunk[0]
symbol_chunk = symbol_chunk[1::]
self.currentSymbols = np.append(self.currentSymbols, symbol_chunk)
if self.currentSymbols[0] > self.reset_limit:
self.currentSymbols = self.currentSymbols[1::]
self.debug(("currentSymbols:", self.currentSymbols.size, self.currentSymbols), TRACE)
# complete packet is determined by long gap at the end
if (self.currentSymbols.size > 1) and (self.currentSymbols[-1] > self.reset_limit):
# extract pulses
pulses = self.currentSymbols[0::2]
# extract gaps
gaps = self.currentSymbols[1::2]
# remove packet pause
gaps = np.where(gaps > self.reset_limit, 0, gaps)
# calculate histogram to determine length of short and long pulses
pulse_histogram = np.histogram(pulses, "auto")
# calculate histogram to determine length of short and long gaps; leave out packet pause
gap_histogram = np.histogram(gaps[np.where(gaps > 0)], "auto")
# derive limits for short pulses/gaps from histogram. Use value in the middle between short and long
self.pulse_short_limit = pulse_histogram[1][pulse_histogram[1].size/2]
self.gap_short_limit = gap_histogram[1][gap_histogram[1].size/2]
self.debug(("Pulses:", pulses.size, pulses), TRACE)
self.debug(("Pulse Histogram", pulse_histogram), TRACE)
self.debug(("pulse_short_limit", self.pulse_short_limit), TRACE)
self.debug(("Gaps:", gaps.size, gaps), TRACE)
self.debug(("Gaps Histogram", gap_histogram), TRACE)
self.debug(("gap_short_limit", self.gap_short_limit), TRACE)
# interleave pulses and gaps into one array like this [p, g, p, g, p, g]
combined = np.empty(pulses.size + gaps.size, dtype=pulses.dtype)
combined[0::2] = pulses
combined[1::2] = gaps
self.debug(("combined:", combined.size, combined), TRACE)
# convert pulse/gap-width to bits as per decoding rule
rawBits = np.empty(combined.size, dtype=np.uint8)
self.debug(("rawBits.size", rawBits.size), TRACE)
rawBits[0::2] = np.where(combined[0::2] < self.pulse_short_limit, 1, 0)
rawBits[1::2] = np.where(combined[1::2] < self.gap_short_limit, 255, 0)
# remove short gaps
rawBits = rawBits[np.where(rawBits <= 1)]
self.debug(("rawBits:", rawBits.size, rawBits), TRACE)
# prepare boolean mask for parity bits (every 9th bit)
parityMask = np.mod(np.arange(rawBits.size)+1, 9) == 0
# extract parity bits as boolean array
parityBits = np.extract(parityMask, rawBits) == 1
# extract packet bits
packetBits = np.extract(np.invert(parityMask), rawBits) == 1
if (packetBits.size % 8) == 0:
# swap MSB and LSB, invert Bits, pack 8 bits into one byte, reverse order to compensate for 1st flip
packet = np.packbits(np.invert(packetBits[::-1]))[::-1]
np.set_printoptions(formatter={'int':hex})
self.debug(("packet:", packet.size, packet), INFO)
# calculate parity of each byte by splitting the bits into reversed and inverted 8-bit parts and
# calculate the sum of set bits;
packetParity = (np.sum(np.split(np.invert(packetBits[::-1]), np.arange(8, packetBits.size, 8)), axis=1)[::-1] % 2) == 0
self.debug(("packetParity:", packetParity.size, packetParity), TRACE)
np.set_printoptions(formatter=None)
# check parity of packet
if np.array_equal(packetParity, parityBits):
# check for correct sensor type and header-byte
if (packet.size == 10) and (packet[0] == 0x9f):
channel = (packet[1] >> 5) & 0x0F
if channel >= 5:
channel -= 1
rollingCode = packet[1] & 0x0F
temp = (packet[5] & 0x0F) * 100 + ((packet[4] & 0xF0) >> 4) * 10 + (packet[4] & 0x0F)
if ((packet[5]>>7) & 0x01) == 0:
temp = -temp
self.temperature = temp/10.
battery_ok = (packet[5]>>6) & 0x01
self.humidity = ((packet[6] & 0xF0) >> 4) * 10 + (packet[6] & 0x0F)
self.debug(("Channel:", channel), INFO)
self.debug(("Rolling Code:", rollingCode), INFO)
self.debug(("Battery:", battery_ok), INFO)
print("Temperature:", self.temperature)
print("Humidity:", self.humidity)
else:
self.debug("Unknown Sensor or Header", ERROR)
else:
self.debug("Parity check failed", ERROR)
else:
self.debug("Invalid packet length", ERROR)
# done with this packet
self.currentSymbols = np.empty(0, dtype=np.uint8)
else:
self.debug("Waiting for more data", TRACE)
else:
self.debug("skipping empty chunk", INFO)
self.state = "idle"
else:
self.debug("no edges in chunk", INFO)
self.previousSymbolType = self.rawBuffer[-2]
else:
#self.debug("Chunk is empty or contains no edges")
self.state = "idle"
# all done, delete current rawBuffer
self.rawBuffer = np.empty(0, dtype=np.uint8)
else:
# wait for more samples
self.debug("filling rawBuffer", TRACE)
output_items[0][:] = self.temperature
output_items[1][:] = self.humidity
return len(output_items[0])
</value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>debug_level</key>
<value>1</value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>_coordinate</key>
<value>(864, 552)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>decoder</value>
</param>
<param>
<key>sample_rate</key>
<value>20000</value>
</param>
</block>
<block>
<key>digital_binary_slicer_fb</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>_coordinate</key>
<value>(496, 568)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>digital_binary_slicer_fb_0</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
</block>
<block>
<key>low_pass_filter</key>
<param>
<key>beta</key>
<value>6.76</value>
</param>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>cutoff_freq</key>
<value>cutoff</value>
</param>
<param>
<key>decim</key>
<value>1</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>type</key>
<value>fir_filter_ccf</value>
</param>
<param>
<key>_coordinate</key>
<value>(264, 304)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>gain</key>
<value>1</value>
</param>
<param>
<key>id</key>
<value>low_pass_filter_1</value>
</param>
<param>
<key>interp</key>
<value>1</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
<param>
<key>samp_rate</key>
<value>samp_rate</value>
</param>
<param>
<key>width</key>
<value>cutoff*2</value>
</param>
<param>
<key>win</key>
<value>firdes.WIN_HAMMING</value>
</param>
</block>
<block>
<key>qtgui_freq_sink_x</key>
<param>
<key>autoscale</key>
<value>False</value>
</param>
<param>
<key>average</key>
<value>1.0</value>
</param>