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Version 0.2

pull/21/head v0.2
Pieter Robyns 2016-08-11 13:37:40 +02:00
rodzic 96eec1df79
commit ad85c5e416
17 zmienionych plików z 4662 dodań i 101 usunięć
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131
apps/lora_receive_file.grc
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@ -1,5 +1,5 @@
<?xml version='1.0' encoding='utf-8'?>
<?grc format='1' created='3.7.9'?>
<?grc format='1' created='3.7.10'?>
<flow_graph>
<timestamp>Tue Apr 12 11:23:34 2016</timestamp>
<block>
@ -163,30 +163,62 @@
</param>
</block>
<block>
<key>variable</key>
<key>variable_slider</key>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>converver</key>
<value>int_converter</value>
</param>
<param>
<key>value</key>
<value>-95</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(464, 77)</value>
<value>(976, 16)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>decimation</value>
<key>grid_pos</key>
<value></value>
</param>
<param>
<key>value</key>
<value>10</value>
<key>id</key>
<value>finetune</value>
</param>
<param>
<key>label</key>
<value></value>
</param>
<param>
<key>max</key>
<value>150</value>
</param>
<param>
<key>min</key>
<value>-150</value>
</param>
<param>
<key>notebook</key>
<value></value>
</param>
<param>
<key>num_steps</key>
<value>300</value>
</param>
<param>
<key>style</key>
<value>wx.SL_HORIZONTAL</value>
</param>
</block>
<block>
@ -267,7 +299,7 @@
</param>
<param>
<key>value</key>
<value>10e6 </value>
<value>10e6</value>
</param>
</block>
<block>
@ -375,7 +407,7 @@
</param>
<param>
<key>_coordinate</key>
<value>(16, 141)</value>
<value>(16, 188)</value>
</param>
<param>
<key>_rotation</key>
@ -406,61 +438,6 @@
<value>1</value>
</param>
</block>
<block>
<key>blocks_file_source</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>0</value>
</param>
<param>
<key>file</key>
<value>/tmp/cap.cfile</value>
</param>
<param>
<key>_coordinate</key>
<value>(16, 205)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>blocks_file_source_0_0</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
<param>
<key>type</key>
<value>complex</value>
</param>
<param>
<key>repeat</key>
<value>True</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<block>
<key>blocks_throttle</key>
<param>
@ -532,7 +509,11 @@
</param>
<param>
<key>_enabled</key>
<value>True</value>
<value>1</value>
</param>
<param>
<key>finetune</key>
<value>finetune</value>
</param>
<param>
<key>freq</key>
@ -540,7 +521,7 @@
</param>
<param>
<key>_coordinate</key>
<value>(424, 182)</value>
<value>(424, 168)</value>
</param>
<param>
<key>_rotation</key>
@ -554,6 +535,10 @@
<key>offset</key>
<value>offset</value>
</param>
<param>
<key>realtime</key>
<value>False</value>
</param>
<param>
<key>in_samp_rate</key>
<value>samp_rate</value>
@ -587,7 +572,7 @@
</param>
<param>
<key>_enabled</key>
<value>0</value>
<value>1</value>
</param>
<param>
<key>fft_size</key>
@ -599,7 +584,7 @@
</param>
<param>
<key>_coordinate</key>
<value>(80, 325)</value>
<value>(424, 284)</value>
</param>
<param>
<key>_rotation</key>
@ -611,7 +596,7 @@
</param>
<param>
<key>id</key>
<value>wxgui_fftsink2_0</value>
<value>wxgui_fftsink2_1</value>
</param>
<param>
<key>notebook</key>
@ -668,12 +653,6 @@
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_file_source_0_0</source_block_id>
<sink_block_id>blocks_throttle_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_throttle_0</source_block_id>
<sink_block_id>lora_lora_receiver_0</sink_block_id>
@ -682,7 +661,7 @@
</connection>
<connection>
<source_block_id>blocks_throttle_0</source_block_id>
<sink_block_id>wxgui_fftsink2_0</sink_block_id>
<sink_block_id>wxgui_fftsink2_1</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>

71
apps/lora_receive_file.py
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@ -3,7 +3,7 @@
##################################################
# GNU Radio Python Flow Graph
# Title: Lora Receive File
# Generated: Wed Jun 22 19:59:10 2016
# Generated: Thu Aug 11 11:27:08 2016
##################################################
if __name__ == '__main__':
@ -19,8 +19,12 @@ if __name__ == '__main__':
from gnuradio import blocks
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import wxgui
from gnuradio.eng_option import eng_option
from gnuradio.fft import window
from gnuradio.filter import firdes
from gnuradio.wxgui import fftsink2
from gnuradio.wxgui import forms
from grc_gnuradio import wxgui as grc_wxgui
from optparse import OptionParser
import lora
@ -37,19 +41,58 @@ class lora_receive_file(grc_wxgui.top_block_gui):
##################################################
self.target_freq = target_freq = 868.1e6
self.sf = sf = 12
self.samp_rate = samp_rate = 10e6
self.samp_rate = samp_rate = 10e6
self.capture_freq = capture_freq = 866.0e6
self.bw = bw = 125e3
self.symbols_per_sec = symbols_per_sec = bw / (2**sf)
self.offset = offset = -(capture_freq - target_freq)
self.firdes_tap = firdes_tap = firdes.low_pass(1, samp_rate, bw, 10000, firdes.WIN_HAMMING, 6.67)
self.decimation = decimation = 10
self.finetune = finetune = -95
self.bitrate = bitrate = sf * (1 / (2**sf / bw))
##################################################
# Blocks
##################################################
self.lora_lora_receiver_0 = lora.lora_receiver(samp_rate, capture_freq, offset)
_finetune_sizer = wx.BoxSizer(wx.VERTICAL)
self._finetune_text_box = forms.text_box(
parent=self.GetWin(),
sizer=_finetune_sizer,
value=self.finetune,
callback=self.set_finetune,
label='finetune',
converter=forms.int_converter(),
proportion=0,
)
self._finetune_slider = forms.slider(
parent=self.GetWin(),
sizer=_finetune_sizer,
value=self.finetune,
callback=self.set_finetune,
minimum=-150,
maximum=150,
num_steps=300,
style=wx.SL_HORIZONTAL,
cast=int,
proportion=1,
)
self.Add(_finetune_sizer)
self.wxgui_fftsink2_1 = fftsink2.fft_sink_c(
self.GetWin(),
baseband_freq=capture_freq,
y_per_div=10,
y_divs=10,
ref_level=0,
ref_scale=2.0,
sample_rate=samp_rate,
fft_size=1024,
fft_rate=15,
average=False,
avg_alpha=None,
title="FFT Plot",
peak_hold=False,
)
self.Add(self.wxgui_fftsink2_1.win)
self.lora_lora_receiver_0 = lora.lora_receiver(samp_rate, capture_freq, offset, finetune, False)
self.blocks_throttle_0 = blocks.throttle(gr.sizeof_gr_complex*1, samp_rate,True)
self.blocks_file_source_0 = blocks.file_source(gr.sizeof_gr_complex*1, "counting_cr4_sf7.cfile", True)
@ -58,6 +101,7 @@ class lora_receive_file(grc_wxgui.top_block_gui):
##################################################
self.connect((self.blocks_file_source_0, 0), (self.blocks_throttle_0, 0))
self.connect((self.blocks_throttle_0, 0), (self.lora_lora_receiver_0, 0))
self.connect((self.blocks_throttle_0, 0), (self.wxgui_fftsink2_1, 0))
def get_target_freq(self):
return self.target_freq
@ -71,14 +115,15 @@ class lora_receive_file(grc_wxgui.top_block_gui):
def set_sf(self, sf):
self.sf = sf
self.set_bitrate(self.sf * (1 / (2**self.sf / self.bw)))
self.set_symbols_per_sec(self.bw / (2**self.sf))
self.set_bitrate(self.sf * (1 / (2**self.sf / self.bw)))
def get_samp_rate(self):
return self.samp_rate
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
self.wxgui_fftsink2_1.set_sample_rate(self.samp_rate)
self.set_firdes_tap(firdes.low_pass(1, self.samp_rate, self.bw, 10000, firdes.WIN_HAMMING, 6.67))
self.blocks_throttle_0.set_sample_rate(self.samp_rate)
@ -88,15 +133,16 @@ class lora_receive_file(grc_wxgui.top_block_gui):
def set_capture_freq(self, capture_freq):
self.capture_freq = capture_freq
self.set_offset(-(self.capture_freq - self.target_freq))
self.wxgui_fftsink2_1.set_baseband_freq(self.capture_freq)
def get_bw(self):
return self.bw
def set_bw(self, bw):
self.bw = bw
self.set_bitrate(self.sf * (1 / (2**self.sf / self.bw)))
self.set_firdes_tap(firdes.low_pass(1, self.samp_rate, self.bw, 10000, firdes.WIN_HAMMING, 6.67))
self.set_symbols_per_sec(self.bw / (2**self.sf))
self.set_firdes_tap(firdes.low_pass(1, self.samp_rate, self.bw, 10000, firdes.WIN_HAMMING, 6.67))
self.set_bitrate(self.sf * (1 / (2**self.sf / self.bw)))
def get_symbols_per_sec(self):
return self.symbols_per_sec
@ -116,11 +162,14 @@ class lora_receive_file(grc_wxgui.top_block_gui):
def set_firdes_tap(self, firdes_tap):
self.firdes_tap = firdes_tap
def get_decimation(self):
return self.decimation
def get_finetune(self):
return self.finetune
def set_decimation(self, decimation):
self.decimation = decimation
def set_finetune(self, finetune):
self.finetune = finetune
self._finetune_slider.set_value(self.finetune)
self._finetune_text_box.set_value(self.finetune)
self.lora_lora_receiver_0.set_finetune(self.finetune)
def get_bitrate(self):
return self.bitrate

2158
apps/lora_receive_realtime.grc 100644
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Plik diff jest za duży Load Diff

199
apps/lora_receive_realtime.py 100755
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@ -0,0 +1,199 @@
#!/usr/bin/env python2
# -*- coding: utf-8 -*-
##################################################
# GNU Radio Python Flow Graph
# Title: Lora Receive Realtime
# Generated: Thu Aug 11 11:27:37 2016
##################################################
if __name__ == '__main__':
import ctypes
import sys
if sys.platform.startswith('linux'):
try:
x11 = ctypes.cdll.LoadLibrary('libX11.so')
x11.XInitThreads()
except:
print "Warning: failed to XInitThreads()"
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import uhd
from gnuradio import wxgui
from gnuradio.eng_option import eng_option
from gnuradio.fft import window
from gnuradio.filter import firdes
from gnuradio.wxgui import fftsink2
from gnuradio.wxgui import forms
from grc_gnuradio import wxgui as grc_wxgui
from optparse import OptionParser
import lora
import time
import wx
class lora_receive_realtime(grc_wxgui.top_block_gui):
def __init__(self):
grc_wxgui.top_block_gui.__init__(self, title="Lora Receive Realtime")
##################################################
# Variables
##################################################
self.target_freq = target_freq = 868.1e6
self.sf = sf = 12
self.samp_rate = samp_rate = 2e6
self.capture_freq = capture_freq = 867.8e6
self.bw = bw = 125e3
self.symbols_per_sec = symbols_per_sec = bw / (2**sf)
self.offset = offset = -(capture_freq - target_freq)
self.firdes_tap = firdes_tap = firdes.low_pass(1, samp_rate, bw, 10000, firdes.WIN_HAMMING, 6.67)
self.finetune = finetune = -95
self.bitrate = bitrate = sf * (1 / (2**sf / bw))
##################################################
# Blocks
##################################################
_finetune_sizer = wx.BoxSizer(wx.VERTICAL)
self._finetune_text_box = forms.text_box(
parent=self.GetWin(),
sizer=_finetune_sizer,
value=self.finetune,
callback=self.set_finetune,
label='finetune',
converter=forms.int_converter(),
proportion=0,
)
self._finetune_slider = forms.slider(
parent=self.GetWin(),
sizer=_finetune_sizer,
value=self.finetune,
callback=self.set_finetune,
minimum=-150,
maximum=150,
num_steps=300,
style=wx.SL_HORIZONTAL,
cast=int,
proportion=1,
)
self.Add(_finetune_sizer)
self.wxgui_fftsink2_1 = fftsink2.fft_sink_c(
self.GetWin(),
baseband_freq=capture_freq,
y_per_div=10,
y_divs=10,
ref_level=0,
ref_scale=2.0,
sample_rate=samp_rate,
fft_size=1024,
fft_rate=15,
average=False,
avg_alpha=None,
title="FFT Plot",
peak_hold=False,
)
self.Add(self.wxgui_fftsink2_1.win)
self.uhd_usrp_source_0 = uhd.usrp_source(
",".join(("", "")),
uhd.stream_args(
cpu_format="fc32",
channels=range(1),
),
)
self.uhd_usrp_source_0.set_samp_rate(samp_rate)
self.uhd_usrp_source_0.set_center_freq(capture_freq, 0)
self.uhd_usrp_source_0.set_gain(15, 0)
self.uhd_usrp_source_0.set_antenna("RX2", 0)
self.lora_lora_receiver_0 = lora.lora_receiver(samp_rate, capture_freq, offset, finetune, True)
##################################################
# Connections
##################################################
self.connect((self.uhd_usrp_source_0, 0), (self.lora_lora_receiver_0, 0))
self.connect((self.uhd_usrp_source_0, 0), (self.wxgui_fftsink2_1, 0))
def get_target_freq(self):
return self.target_freq
def set_target_freq(self, target_freq):
self.target_freq = target_freq
self.set_offset(-(self.capture_freq - self.target_freq))
def get_sf(self):
return self.sf
def set_sf(self, sf):
self.sf = sf
self.set_symbols_per_sec(self.bw / (2**self.sf))
self.set_bitrate(self.sf * (1 / (2**self.sf / self.bw)))
def get_samp_rate(self):
return self.samp_rate
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
self.wxgui_fftsink2_1.set_sample_rate(self.samp_rate)
self.uhd_usrp_source_0.set_samp_rate(self.samp_rate)
self.set_firdes_tap(firdes.low_pass(1, self.samp_rate, self.bw, 10000, firdes.WIN_HAMMING, 6.67))
def get_capture_freq(self):
return self.capture_freq
def set_capture_freq(self, capture_freq):
self.capture_freq = capture_freq
self.set_offset(-(self.capture_freq - self.target_freq))
self.wxgui_fftsink2_1.set_baseband_freq(self.capture_freq)
self.uhd_usrp_source_0.set_center_freq(self.capture_freq, 0)
def get_bw(self):
return self.bw
def set_bw(self, bw):
self.bw = bw
self.set_symbols_per_sec(self.bw / (2**self.sf))
self.set_firdes_tap(firdes.low_pass(1, self.samp_rate, self.bw, 10000, firdes.WIN_HAMMING, 6.67))
self.set_bitrate(self.sf * (1 / (2**self.sf / self.bw)))
def get_symbols_per_sec(self):
return self.symbols_per_sec
def set_symbols_per_sec(self, symbols_per_sec):
self.symbols_per_sec = symbols_per_sec
def get_offset(self):
return self.offset
def set_offset(self, offset):
self.offset = offset
def get_firdes_tap(self):
return self.firdes_tap
def set_firdes_tap(self, firdes_tap):
self.firdes_tap = firdes_tap
def get_finetune(self):
return self.finetune
def set_finetune(self, finetune):
self.finetune = finetune
self._finetune_slider.set_value(self.finetune)
self._finetune_text_box.set_value(self.finetune)
self.lora_lora_receiver_0.set_finetune(self.finetune)
def get_bitrate(self):
return self.bitrate
def set_bitrate(self, bitrate):
self.bitrate = bitrate
def main(top_block_cls=lora_receive_realtime, options=None):
tb = top_block_cls()
tb.Start(True)
tb.Wait()
if __name__ == '__main__':
main()

15
grc/lora_receiver.xml
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@ -4,7 +4,14 @@
<key>lora_lora_receiver</key>
<category>lora</category>
<import>import lora</import>
<make>lora.lora_receiver($in_samp_rate, $freq, $offset)</make>
<make>lora.lora_receiver($in_samp_rate, $freq, $offset, $finetune, $realtime)</make>
<callback>set_finetune($finetune)</callback>
<param>
<name>Finetune</name>
<key>finetune</key>
<type>int</type>
</param>
<param>
<name>Sample rate</name>
@ -24,6 +31,12 @@
<type>float</type>
</param>
<param>
<name>Realtime</name>
<key>realtime</key>
<type>bool</type>
</param>
<sink>
<name>in</name>
<type>complex</type>

2
include/lora/CMakeLists.txt
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@ -22,5 +22,5 @@
########################################################################
install(FILES
api.h
DESTINATION include/lora
decoder.h DESTINATION include/lora
)

714
include/lora/decoder.h 100644
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@ -0,0 +1,714 @@
/* -*- c++ -*- */
/* GNU GENERAL PUBLIC LICENSE
* Version 3, 29 June 2007
*
* Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
* Everyone is permitted to copy and distribute verbatim copies
* of this license document, but changing it is not allowed.
*
* Preamble
*
* The GNU General Public License is a free, copyleft license for
* software and other kinds of works.
*
* The licenses for most software and other practical works are designed
* to take away your freedom to share and change the works. By contrast,
* the GNU General Public License is intended to guarantee your freedom to
* share and change all versions of a program--to make sure it remains free
* software for all its users. We, the Free Software Foundation, use the
* GNU General Public License for most of our software; it applies also to
* any other work released this way by its authors. You can apply it to
* your programs, too.
*
* When we speak of free software, we are referring to freedom, not
* price. Our General Public Licenses are designed to make sure that you
* have the freedom to distribute copies of free software (and charge for
* them if you wish), that you receive source code or can get it if you
* want it, that you can change the software or use pieces of it in new
* free programs, and that you know you can do these things.
*
* To protect your rights, we need to prevent others from denying you
* these rights or asking you to surrender the rights. Therefore, you have
* certain responsibilities if you distribute copies of the software, or if
* you modify it: responsibilities to respect the freedom of others.
*
* For example, if you distribute copies of such a program, whether
* gratis or for a fee, you must pass on to the recipients the same
* freedoms that you received. You must make sure that they, too, receive
* or can get the source code. And you must show them these terms so they
* know their rights.
*
* Developers that use the GNU GPL protect your rights with two steps:
* (1) assert copyright on the software, and (2) offer you this License
* giving you legal permission to copy, distribute and/or modify it.
*
* For the developers' and authors' protection, the GPL clearly explains
* that there is no warranty for this free software. For both users' and
* authors' sake, the GPL requires that modified versions be marked as
* changed, so that their problems will not be attributed erroneously to
* authors of previous versions.
*
* Some devices are designed to deny users access to install or run
* modified versions of the software inside them, although the manufacturer
* can do so. This is fundamentally incompatible with the aim of
* protecting users' freedom to change the software. The systematic
* pattern of such abuse occurs in the area of products for individuals to
* use, which is precisely where it is most unacceptable. Therefore, we
* have designed this version of the GPL to prohibit the practice for those
* products. If such problems arise substantially in other domains, we
* stand ready to extend this provision to those domains in future versions
* of the GPL, as needed to protect the freedom of users.
*
* Finally, every program is threatened constantly by software patents.
* States should not allow patents to restrict development and use of
* software on general-purpose computers, but in those that do, we wish to
* avoid the special danger that patents applied to a free program could
* make it effectively proprietary. To prevent this, the GPL assures that
* patents cannot be used to render the program non-free.
*
* The precise terms and conditions for copying, distribution and
* modification follow.
*
* TERMS AND CONDITIONS
*
* 0. Definitions.
*
* "This License" refers to version 3 of the GNU General Public License.
*
* "Copyright" also means copyright-like laws that apply to other kinds of
* works, such as semiconductor masks.
*
* "The Program" refers to any copyrightable work licensed under this
* License. Each licensee is addressed as "you". "Licensees" and
* "recipients" may be individuals or organizations.
*
* To "modify" a work means to copy from or adapt all or part of the work
* in a fashion requiring copyright permission, other than the making of an
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* under certain conditions; type `show c' for details.
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* parts of the General Public License. Of course, your program's commands
* might be different; for a GUI interface, you would use an "about box".
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* Public License instead of this License. But first, please read
* <http://www.gnu.org/philosophy/why-not-lgpl.html>.
*/
#ifndef INCLUDED_LORA_DECODER_H
#define INCLUDED_LORA_DECODER_H
#include <lora/api.h>
#include <gnuradio/sync_block.h>
namespace gr {
namespace lora {
/*!
* \brief <+description of block+>
* \ingroup lora
*
*/
class LORA_API decoder : virtual public gr::sync_block
{
public:
typedef boost::shared_ptr<decoder> sptr;
/*!
* \brief Return a shared_ptr to a new instance of lora::decoder.
*
* To avoid accidental use of raw pointers, lora::decoder's
* constructor is in a private implementation
* class. lora::decoder::make is the public interface for
* creating new instances.
*/
static sptr make(int finetune);
virtual void set_finetune(int32_t finetune) = 0;
};
} // namespace lora
} // namespace gr
#endif /* INCLUDED_LORA_DECODER_H */

4
lib/CMakeLists.txt
Wyświetl plik

@ -26,6 +26,7 @@ include_directories(${Boost_INCLUDE_DIR})
link_directories(${Boost_LIBRARY_DIRS})
list(APPEND lora_sources
decoder_impl.cc
)
set(lora_sources "${lora_sources}" PARENT_SCOPE)
@ -35,7 +36,7 @@ if(NOT lora_sources)
endif(NOT lora_sources)
add_library(gnuradio-lora SHARED ${lora_sources})
target_link_libraries(gnuradio-lora ${Boost_LIBRARIES} ${GNURADIO_ALL_LIBRARIES})
target_link_libraries(gnuradio-lora ${Boost_LIBRARIES} ${GNURADIO_ALL_LIBRARIES} liquid)
set_target_properties(gnuradio-lora PROPERTIES DEFINE_SYMBOL "gnuradio_lora_EXPORTS")
if(APPLE)
@ -73,6 +74,7 @@ target_link_libraries(
${Boost_LIBRARIES}
${CPPUNIT_LIBRARIES}
gnuradio-lora
liquid
)
GR_ADD_TEST(test_lora test-lora)

536
lib/decoder_impl.cc 100644
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@ -0,0 +1,536 @@
/* -*- c++ -*- */
/*
* Copyright 2016 Pieter Robyns.
*
* This 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 version 3, or (at your option)
* any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gnuradio/io_signature.h>
#include <gnuradio/expj.h>
#include <liquid/liquid.h>
#include "decoder_impl.h"
#include "tables.h"
#include "utilities.h"
#define CORRELATION_SEARCH_RANGE 1024
#define DELAY_AFTER_SYNC 262
//#define NO_TMP_WRITES 1
namespace gr {
namespace lora {
decoder::sptr
decoder::make(int finetune) {
return gnuradio::get_initial_sptr
(new decoder_impl(finetune));
}
/*
* The private constructor
*/
decoder_impl::decoder_impl(int finetune) : gr::sync_block("decoder",
gr::io_signature::make(1, -1, sizeof(gr_complex)),
gr::io_signature::make(0, 2, sizeof(float))) {
d_state = DETECT;
d_debug_samples.open("/tmp/grlora_debug", std::ios::out | std::ios::binary);
d_debug.open("/tmp/grlora_debug_txt", std::ios::out);
d_sf = 7; // Only affects PHY send
d_bw = 125000;
d_cr = 4;
d_bits_per_second = (double)d_sf * 1.0f / (pow(2.0f, d_sf) / d_bw);
d_samples_per_second = 1000000;
d_symbols_per_second = (double)d_bw / pow(2.0f, d_sf);
d_bits_per_symbol = (uint32_t)(d_bits_per_second / d_symbols_per_second);
d_samples_per_symbol = (uint32_t)(d_samples_per_second / d_symbols_per_second);
d_number_of_bins = (uint32_t)pow(2, d_sf);
d_number_of_bins_hdr = d_number_of_bins / 4;
d_compression = 8;
d_payload_symbols = 0;
d_finetune = finetune;
// Some preparations
std::cout << "Bits per symbol: " << d_bits_per_symbol << std::endl;
std::cout << "Bins per symbol: " << d_number_of_bins << std::endl;
std::cout << "Header bins per symbol: " << d_number_of_bins_hdr << std::endl;
std::cout << "Samples per symbol: " << d_samples_per_symbol << std::endl;
build_ideal_downchirp();
set_output_multiple(2*d_samples_per_symbol);
d_fft.resize(d_samples_per_symbol);
d_mult.resize(d_samples_per_symbol);
d_q = fft_create_plan(d_samples_per_symbol, &d_mult[0], &d_fft[0], LIQUID_FFT_FORWARD, 0);
}
/*
* Our virtual destructor.
*/
decoder_impl::~decoder_impl() {
if(d_debug_samples.is_open())
d_debug_samples.close();
if(d_debug.is_open())
d_debug.close();
fft_destroy_plan(d_q);
}
void decoder_impl::build_ideal_downchirp(void) {
d_downchirp.resize(d_samples_per_symbol);
d_downchirp_fft.resize(d_samples_per_symbol);
double T = 1.0f / d_symbols_per_second;
double dir = -1.0f;
double dt = 1.0f / d_samples_per_second;
double f0 = (d_bw / 2.0f);
double amplitude = 1.0f;
// Store time domain signal
for(int i = 0; i < d_samples_per_symbol; i++) { // Width in number of samples = samples_per_symbol
// See https://en.wikipedia.org/wiki/Chirp#Linear
double t = dt * i;
d_downchirp[i] = gr_complex(amplitude, amplitude) * gr_expj(2.0f * M_PI * (f0 * t + (dir * (0.5 * d_bw / T) * pow(t, 2))));
}
// Store FFT of downchirp TODO needed?
int flags = 0;
fftplan q = fft_create_plan(d_samples_per_symbol, &d_downchirp[0], &d_downchirp_fft[0], LIQUID_FFT_FORWARD, flags);
fft_execute(q);
fft_destroy_plan(q);
samples_to_file("/tmp/downchirp", &d_downchirp[0], d_downchirp.size(), sizeof(gr_complex));
samples_to_file("/tmp/downchirp_fft", &d_downchirp_fft[0], d_downchirp_fft.size(), sizeof(gr_complex));
}
void decoder_impl::samples_to_file(const std::string path, const gr_complex* v, int length, int elem_size) {
#ifndef NO_TMP_WRITES
std::ofstream out_file;
out_file.open(path, std::ios::out | std::ios::binary);
//for(std::vector<gr_complex>::const_iterator it = v.begin(); it != v.end(); ++it) {
for(uint32_t i = 0; i < length; i++) {
out_file.write(reinterpret_cast<const char *>(&v[i]), elem_size);
}
out_file.close();
#endif
}
void decoder_impl::samples_debug(const gr_complex* v, int length) {
gr_complex start_indicator(0.0f,32.0f);
d_debug_samples.write(reinterpret_cast<const char *>(&start_indicator), sizeof(gr_complex));
for(uint32_t i = 1; i < length; i++) {
d_debug_samples.write(reinterpret_cast<const char *>(&v[i]), sizeof(gr_complex));
}
}
bool decoder_impl::calc_energy_threshold(gr_complex* samples, int window_size, float threshold) {
float result = 0.0f;
for(int i = 0; i < window_size; i++) {
result += std::pow(abs(samples[i]), 2);
}
result /= (float)window_size;
//d_debug << "T: " << result << "\n";
if(result > threshold) {
return true;
} else {
return false;
}
}
inline void decoder_impl::phase(gr_complex* in_samples, float* out_phase, int window) {
for(int i = 0; i < window; i++) {
out_phase[i] = arg(in_samples[i]); // = the same as atan2(imag(in_samples[i]),real(in_samples[i]));
}
}
double decoder_impl::freq_cross_correlate(const gr_complex *samples_1, const gr_complex *samples_2, int window) {
double result = 0.0f;
float instantaneous_phase[window];
float instantaneous_phase_down[window];
float instantaneous_freq[window];
float instantaneous_freq_down[window];
// Determine instant phase
for(unsigned int i = 0; i < window; i++) {
instantaneous_phase[i] = arg(samples_1[i]);
instantaneous_phase_down[i] = arg(samples_2[i]);
}
liquid_unwrap_phase(instantaneous_phase, window);
liquid_unwrap_phase(instantaneous_phase_down, window);
// Instant freq
for(unsigned int i = 1; i < window; i++) {
instantaneous_freq[i-1] = instantaneous_phase[i] - instantaneous_phase[i-1];
instantaneous_freq_down[i-1] = instantaneous_phase_down[i] - instantaneous_phase_down[i-1];
}
for (int i = 0; i < window-1; i++) {
result += instantaneous_freq[i] * instantaneous_freq_down[i];
}
result = result / window;
return result;
}
// TODO: Instead of the finetuning parameter, one could look at the minimum
// and maximum instantaneous frequency to determine how detuned the sender
// is from the channel frequency.
int decoder_impl::sync_fft(const gr_complex* samples) {
float fft_mag[d_samples_per_symbol];
// Multiply with ideal downchirp
for(uint32_t i = 0; i < d_samples_per_symbol; i++) {
d_mult[i] = samples[i] * d_downchirp[i];
}
// Perform FFT
fft_execute(d_q);
// Get magnitude
for(int i = 0; i < d_samples_per_symbol; i++) {
fft_mag[i] = abs(d_fft[i]);
}
samples_to_file("/tmp/fft", &d_fft[0], d_samples_per_symbol, sizeof(gr_complex));
// Return argmax here
return (std::max_element(fft_mag,fft_mag+d_samples_per_symbol) - fft_mag);
}
unsigned int decoder_impl::max_frequency_gradient_idx(gr_complex* samples) {
float instantaneous_phase[d_samples_per_symbol];
float instantaneous_freq[d_samples_per_symbol];
float bins[d_number_of_bins];
// Determine instant phase
for(unsigned int i = 0; i < d_samples_per_symbol; i++) {
instantaneous_phase[i] = arg(samples[i]);
}
liquid_unwrap_phase(instantaneous_phase, d_samples_per_symbol);
float max_if_diff = 2000.0f;
unsigned int max_if_diff_idx = 0;
for(unsigned int i = 1; i < d_samples_per_symbol; i++) {
float ifreq = (instantaneous_phase[i] - instantaneous_phase[i-1]) / (2.0f * M_PI) * d_samples_per_second; // TODO: constant multiplication can be removed
instantaneous_freq[i-1] = ifreq;
}
int osr = d_samples_per_symbol / d_number_of_bins;
float last_avg = instantaneous_freq[0];
for(unsigned int i = 0; i < d_number_of_bins; i++) {
float avg = 0.0f;
for(unsigned int j = 0; j < osr; j++) {
avg += instantaneous_freq[(osr*i) + j];
}
avg /= osr;
float diff = abs(last_avg - avg);
if(diff > max_if_diff) {
max_if_diff = diff;
max_if_diff_idx = i;
}
last_avg = avg;
}
//std::cout << "!!!" << max_if_diff << std::endl;
return max_if_diff_idx;
}
bool decoder_impl::demodulate(gr_complex* samples, bool is_header) {
unsigned int bin_idx = max_frequency_gradient_idx(samples);
// Header has additional redundancy
if(is_header) {
bin_idx /= 4;
}
// Decode (actually gray encode) the bin to get the symbol value
unsigned int word = gray_encode(bin_idx);
d_debug << bin_idx << " " << to_bin(word, is_header ? 5 : 7) << std::endl;
d_words.push_back(word);
// Look for 4+cr symbols and stop
if(d_words.size() == (4 + d_cr)) {
// Deinterleave
if(is_header) {
//print_vector(d_words, "M", d_sf - 2);
deinterleave(d_sf - 2);
} else {
//print_vector(d_words, "M", d_sf);
deinterleave(d_sf);
}
return true; // Signal that a block is ready for decoding
}
return false; // We need more words in order to decode a block
}
void decoder_impl::deinterleave(int ppm) {
unsigned int bits_per_word = d_words.size();
if(bits_per_word > 8) { // Not sure if this can ever occur. It would imply coding rate high than 4/8 e.g. 4/9.
std::cout << "More than 8 bits per word. uint8_t will not be sufficient! Bytes need to be stored in intermediate array and then packed into words_deinterleaved!" << std::endl;
}
unsigned int offset_start = ppm-1;
std::vector<uint8_t> words_deinterleaved;
for(unsigned int i = 0; i < ppm; i++) {
uint8_t d = 0;
unsigned int offset_diag = offset_start;
for(unsigned int j = 0; j < bits_per_word; j++) {
uint8_t power = pow(2, j);
unsigned int power_check = pow(2, offset_diag); // TODO: Here we are actually reversing endianess. This needs to be fixed in the future by implementing the interleaving similarly to how it is done in the Python based decoder.
if((d_words[j] & power_check) > 0) { // Mask triggers
d += power;
}
if(offset_diag == 0)
offset_diag = ppm-1;
else
offset_diag -= 1;
}
offset_start -= 1;
words_deinterleaved.push_back(d);
}
//print_vector(words_deinterleaved, "D", sizeof(uint8_t)*8);
std::reverse(words_deinterleaved.begin(),words_deinterleaved.end());
// Add to demodulated data
for(int i = 0; i < words_deinterleaved.size(); i++) {
d_demodulated.push_back(words_deinterleaved[i]);
}
// Cleanup
d_words.clear();
}
int decoder_impl::decode(uint8_t* out_data, bool is_header) {
const uint8_t* prng = NULL;
const uint8_t shuffle_pattern[] = {7, 6, 3, 4, 2, 1, 0, 5};
if(is_header) {
prng = prng_header;
} else {
prng = prng_payload;
}
deshuffle(shuffle_pattern);
dewhiten(prng);
hamming_decode(out_data);
// Nibbles are reversed
nibble_reverse(out_data, d_payload_length);
// Print result
std::stringstream result;
for (int i = 0; i < d_payload_length; i++) {
result << " " << std::hex << std::setw(2) << std::setfill('0') << (int)out_data[i];
}
if(!is_header)
std::cout << result.str() << std::endl;
return 0;
}
void decoder_impl::deshuffle(const uint8_t* shuffle_pattern) {
for(int i = 0; i < d_demodulated.size(); i++) {
uint8_t original = d_demodulated[i];
uint8_t result = 0;
for(int j = 0; j < sizeof(shuffle_pattern) / sizeof(uint8_t); j++) {
uint8_t mask = pow(2, shuffle_pattern[j]);
if((original & mask) > 0) {
result += pow(2, j);
}
}
d_words_deshuffled.push_back(result);
}
//print_vector(d_words_deshuffled, "S", sizeof(uint8_t)*8);
// We're done with these words
d_demodulated.clear();
}
void decoder_impl::dewhiten(const uint8_t* prng) {
for(int i = 0; i < d_words_deshuffled.size(); i++) {
uint8_t xor_b = d_words_deshuffled[i] ^ prng[i];
xor_b = (xor_b & 0xF0) >> 4 | (xor_b & 0x0F) << 4; // TODO: reverse bit order is performed here, but is probably due to mistake in interleaving
xor_b = (xor_b & 0xCC) >> 2 | (xor_b & 0x33) << 2;
xor_b = (xor_b & 0xAA) >> 1 | (xor_b & 0x55) << 1;
d_words_dewhitened.push_back(xor_b);
}
//print_vector(d_words_dewhitened, "W", sizeof(uint8_t)*8);
d_words_deshuffled.clear();
}
void decoder_impl::hamming_decode(uint8_t* out_data) {
unsigned int n = ceil(d_words_dewhitened.size() * 4.0 / 8.0);
fec_scheme fs = LIQUID_FEC_HAMMING84;
unsigned int k = fec_get_enc_msg_length(fs, n);
fec hamming = fec_create(fs, NULL);
fec_decode(hamming, n, &d_words_dewhitened[0], out_data);
d_words_dewhitened.clear();
fec_destroy(hamming);
}
void decoder_impl::nibble_reverse(uint8_t* out_data, int len) {
for(int i = 0; i < len; i++) {
out_data[i] = ((out_data[i] & 0x0f) << 4) | ((out_data[i] & 0xf0) >> 4);
}
}
int decoder_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items) {
gr_complex * input = (gr_complex*) input_items[0];
float *out = (float*)output_items[0];
switch(d_state) {
case DETECT: {
if(calc_energy_threshold(input, noutput_items, 0.0002)) {
d_debug << "Got something\n";
// Attempt to synchronize to an upchirp of the preamble
int chirp_start_pos = -1;
for(int i = 0; i < CORRELATION_SEARCH_RANGE; i++) {
int c = sync_fft(&input[i]);
if(c == 0) {
chirp_start_pos = i;
d_debug << "DETECT: " << i << std::endl;
samples_to_file("/tmp/detect", &input[chirp_start_pos + d_finetune], CORRELATION_SEARCH_RANGE, sizeof(gr_complex));
break;
}
}
if(chirp_start_pos != -1) {
d_state = SYNC;
d_corr_fails = 0;
consume_each(chirp_start_pos + d_finetune);
} else {
consume_each(noutput_items);
}
} else {
consume_each(noutput_items);
}
break;
}
case SYNC: {
double c = freq_cross_correlate(&input[0], &d_downchirp[0], CORRELATION_SEARCH_RANGE);
d_debug << "C: " << c << std::endl;
if(c > 0.045f) {
d_debug << "SYNC: " << c << std::endl;
// Debug stuff
samples_to_file("/tmp/sync", &input[0], CORRELATION_SEARCH_RANGE, sizeof(gr_complex));
d_state = PAUSE;
consume_each(d_samples_per_symbol);
} else {
d_corr_fails++;
if(d_corr_fails > 32) {
d_state = DETECT;
}
consume_each(d_samples_per_symbol);
}
break;
}
case PAUSE: {
d_state = DECODE_HEADER;
samples_debug(input, d_samples_per_symbol + DELAY_AFTER_SYNC);
consume_each(d_samples_per_symbol + DELAY_AFTER_SYNC);
break;
}
case DECODE_HEADER: {
if(demodulate(input, true)) {
uint8_t decoded[3];
d_payload_length = 3; // TODO: A bit messy. I think it's better to make an internal decoded std::vector
decode(decoded, true);
nibble_reverse(decoded, 1); // TODO: Why?
d_payload_length = decoded[0];
d_cr = 4; // TODO: Get from header instead of hardcode
int symbols_per_block = d_cr + 4;
int bits_needed = ((d_payload_length * 8) + 16) * (symbols_per_block / 4);
float symbols_needed = float(bits_needed) / float(d_sf);
int blocks_needed = ceil(symbols_needed / symbols_per_block);
d_payload_symbols = blocks_needed * symbols_per_block;
d_debug << "LEN: " << d_payload_length << " (" << d_payload_symbols << " symbols)" << std::endl;
d_state = DECODE_PAYLOAD;
}
samples_debug(input, d_samples_per_symbol);
consume_each(d_samples_per_symbol);
break;
}
case DECODE_PAYLOAD: {
if(demodulate(input, false)) {
d_payload_symbols -= (4 + d_cr);
if(d_payload_symbols <= 0) {
uint8_t decoded[d_payload_length];
decode(decoded, false);
d_state = DETECT;
}
}
samples_debug(input, d_samples_per_symbol);
consume_each(d_samples_per_symbol);
break;
}
case STOP: {
consume_each(d_samples_per_symbol);
break;
}
default: {
std::cout << "Shouldn't happen\n";
break;
}
}
// Tell runtime system how many output items we produced.
return 0;
}
void decoder_impl::set_finetune(int32_t finetune) {
d_finetune = finetune;
}
} /* namespace lora */
} /* namespace gr */

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lib/decoder_impl.h 100644
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/* -*- c++ -*- */
/*
* Copyright 2016 Pieter Robyns.
*
* This 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 version 3, or (at your option)
* any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_LORA_DECODER_IMPL_H
#define INCLUDED_LORA_DECODER_IMPL_H
#include <lora/decoder.h>
#include <list>
#include <string>
#include <vector>
#include <fstream>
namespace gr {
namespace lora {
typedef enum decoder_state {
DETECT,
SYNC,
PAUSE,
DECODE_HEADER,
DECODE_PAYLOAD,
STOP
} decoder_state;
class decoder_impl : public decoder
{
private:
decoder_state d_state;
std::vector<gr_complex> d_downchirp;
std::vector<gr_complex> d_downchirp_fft;
std::vector<gr_complex> d_fft;
std::vector<gr_complex> d_mult;
int32_t d_finetune;
uint8_t d_sf;
uint32_t d_bw;
uint8_t d_cr;
double d_bits_per_second;
uint32_t d_samples_per_second;
double d_symbols_per_second;
uint32_t d_bits_per_symbol;
uint32_t d_samples_per_symbol;
uint32_t d_number_of_bins;
uint32_t d_number_of_bins_hdr;
uint32_t d_compression;
uint32_t d_payload_symbols;
uint32_t d_payload_length;
uint32_t d_corr_fails;
std::vector<unsigned int> d_words;
std::vector<uint8_t> d_demodulated;
std::vector<uint8_t> d_words_deshuffled;
std::vector<uint8_t> d_words_dewhitened;
std::vector<uint8_t> d_data;
std::ofstream d_debug_samples;
std::ofstream d_debug;
fftplan d_q;
bool calc_energy_threshold(gr_complex* samples, int window_size, float threshold);
void build_ideal_downchirp(void);
void samples_to_file(const std::string path, const gr_complex* v, int length, int elem_size);
void samples_debug(const gr_complex* v, int length);
double freq_cross_correlate(const gr_complex *samples_1, const gr_complex *samples_2, int window);
int sync_fft(const gr_complex* samples);
unsigned int max_frequency_gradient_idx(gr_complex* samples);
bool demodulate(gr_complex* samples, bool is_header);
void deinterleave(int ppm);
int decode(uint8_t* out_data, bool is_header);
void deshuffle(const uint8_t* shuffle_pattern);
void dewhiten(const uint8_t* prng);
void hamming_decode(uint8_t* out_data);
void nibble_reverse(uint8_t* out_data, int len);
inline void phase(gr_complex* in_samples, float* out_phase, int window);
public:
decoder_impl(int finetune);
~decoder_impl();
// Where all the action really happens
int work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
// GRC interfaces
virtual void set_finetune(int32_t finetune);
};
} // namespace lora
} // namespace gr
#endif /* INCLUDED_LORA_DECODER_IMPL_H */

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#ifndef TABLES_H
#define TABLES_H
namespace gr {
namespace lora {
const uint8_t prng_header[] = {
0x22, 0x11, 0x0, 0x0, 0x0
};
const uint8_t prng_payload[] = {
0xdf, 0xef, 0xb0, 0xf7, 0x9e, 0xfd, 0xc6, 0xdf, 0x10, 0xfb, 0x43, 0x34, 0xa8, 0x5f, 0xf2, 0x97, 0x62, 0x8, 0xf8, 0x49, 0xbe, 0x8a, 0xa4, 0xd6, 0x16, 0xe6, 0x85, 0x39, 0x6b, 0xef, 0xe5, 0xbc, 0xb3, 0x1c, 0x14, 0xa7, 0x3d, 0x4f, 0x91, 0x61, 0x85, 0x72, 0x20, 0x45, 0x4, 0x25, 0x80, 0x1b, 0x41, 0xa7, 0x5b, 0x4, 0xa2, 0x80, 0x9b, 0x41, 0xa7, 0x10, 0x4f, 0x43, 0x61, 0xa8, 0x39, 0xb9, 0xa4, 0x83, 0x16, 0xcb, 0x85, 0xa0, 0x6b, 0x68, 0xae, 0xbc, 0x19, 0x1c, 0x8d, 0xa7, 0xba, 0x4f, 0xda, 0x2a, 0x64, 0xd8, 0x58, 0xdc, 0xb0, 0xa2, 0x9e, 0xd0, 0xc6, 0x46, 0x10, 0x7c, 0x8, 0x34, 0x2, 0x5f, 0x6b, 0x97, 0xe5, 0x8, 0xb3, 0x2, 0x5f, 0x20, 0xdc, 0x4f, 0xa2, 0x61, 0x9b, 0x72, 0xec, 0xe, 0xae, 0xc4, 0x19, 0xa8, 0x8d, 0xb9, 0xf1, 0xc8, 0x3b, 0x2a, 0x57, 0xd8, 0x46, 0xdc, 0x7c, 0xe9, 0x34, 0x31, 0x5f, 0x75, 0xdc, 0x62, 0xa2, 0xf8, 0x9b, 0xf5, 0xa7, 0xe, 0x4, 0xc0, 0x80, 0xa8, 0xa, 0xb9, 0xba, 0xa3, 0xda, 0x80, 0x2f, 0x43, 0xf2, 0x79, 0x62, 0xa2, 0xb3, 0xd0, 0x14, 0xd, 0x76, 0x96, 0x2b, 0xee, 0xd7, 0x72, 0xd, 0x44, 0x96, 0x7e, 0xee, 0xb1, 0x70, 0x77, 0x2f, 0x39, 0xc0, 0x52, 0x28, 0x27, 0xb0, 0x3, 0x73, 0x16, 0xbf, 0xce, 0xdf, 0xc9, 0xb7, 0xd6, 0x18, 0xe6, 0xcd, 0x7a, 0x43, 0x4f, 0x7c, 0xbf, 0x7b, 0xa, 0xbe, 0x6b, 0xc5, 0xe5, 0x5d, 0xe4, 0xe4, 0xbc, 0x5b, 0xce, 0xd1, 0xa8, 0xe6, 0x57, 0x3b, 0x4, 0xcf, 0xa6, 0xbc, 0xd9, 0x57, 0x27, 0x45, 0x69, 0xe6, 0xf7, 0xe2, 0x36, 0x3b, 0x77, 0xe5, 0x89, 0x5d, 0x46, 0x2f, 0x2f, 0x79, 0x49, 0x83, 0xb8, 0xdb, 0x5f, 0xe9, 0x5, 0x88, 0x1d, 0x9b, 0x7, 0x2, 0x8, 0x2b, 0x99, 0xf5, 0x91, 0xbb, 0x85, 0x90, 0x60, 0x76, 0x7f, 0x3a, 0x61, 0x1c, 0x7c, 0xee, 0xc7, 0x5f, 0x6a, 0x41, 0x31, 0x39, 0xfe, 0xcf, 0x82, 0xb8, 0xdb, 0x14, 0xa2, 0xac, 0x68, 0xd5, 0xf6, 0xfc, 0x3e, 0xf7, 0x7e, 0x2c, 0xd8, 0xc4, 0x6d, 0xe2, 0xb9, 0x12, 0xa4, 0x3a, 0x2, 0x7, 0x4e, 0x40, 0x2, 0xba, 0x7, 0xde, 0x9e, 0x6c, 0xc6, 0x52, 0x79, 0x51, 0xb2, 0xad, 0x5c, 0xd8, 0x6, 0xdc, 0x27, 0x83, 0xd5, 0x1f, 0x66, 0xf6, 0x89, 0x4f, 0xc4, 0x26, 0x88, 0x11, 0xb8, 0x3d, 0xa3, 0x95, 0xdb, 0x6, 0xe9, 0xc9, 0xe2, 0xd6, 0x35, 0xa9, 0x13, 0x93, 0xad, 0x1d, 0xae, 0x93, 0x42, 0x4e, 0x60, 0xc1, 0x83, 0x6c, 0x1, 0x3c, 0x9b, 0x96, 0xad, 0x76, 0xc5, 0x70, 0xe0, 0xb6, 0x73, 0x36, 0x45, 0x72, 0x4a, 0xb3, 0x7a, 0x57, 0xd7, 0xfc, 0x51, 0xf9, 0xe6, 0xfe, 0x7a, 0x9e, 0xe, 0xb0, 0xf4, 0xd9, 0xe3, 0xa5, 0x58, 0x28, 0xcb, 0xf2, 0x3c, 0xfd, 0x96, 0x9f, 0x77, 0x80, 0x70, 0xd5, 0x79, 0x66, 0x9e, 0x83, 0xeb, 0xe0, 0x34, 0xe3, 0x94, 0x53, 0x1e, 0xa, 0x91, 0x44, 0xca, 0x20, 0x0, 0x23, 0x17, 0x4d, 0x92, 0x2f, 0x8f, 0x32, 0xd1, 0x28, 0x3f, 0x9, 0x5f, 0xc4, 0x4d, 0x5a, 0xc6, 0xe9, 0x8d, 0xbd, 0xda, 0x3e, 0xbd, 0x92, 0x47, 0xc0, 0x63, 0x41, 0x53, 0x78, 0xa, 0xe9, 0x8f, 0x7e, 0x41, 0x96, 0x30, 0x41, 0x6, 0xad, 0x6b, 0x93, 0x18, 0x1d, 0xb1, 0x4e, 0xd5, 0x2f, 0x66, 0xf2, 0x82, 0x72, 0x1, 0xf1, 0xd0, 0x3c, 0xc, 0xce, 0x84, 0xb8, 0xe6, 0x9c, 0x31, 0xed, 0x8f, 0xac, 0xf3, 0x4a, 0xb6, 0xec, 0x3c, 0xa9, 0xd9, 0xcb, 0x2a, 0x8a, 0x93, 0x2a, 0x1d, 0x8e, 0x95, 0x9, 0xd, 0x8f, 0x20, 0xf1, 0x3e, 0x74, 0x22, 0xfd, 0x5a, 0xdf, 0xbd, 0xfb, 0xf9, 0x77, 0xfe, 0x43, 0x22, 0x10, 0xc, 0xe1, 0xe6, 0x53, 0x62
};
}
}
#endif /* TABLES_H */

54
lib/utilities.h 100644
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@ -0,0 +1,54 @@
#ifndef UTILITIES_H
#define UTILITIES_H
namespace gr {
namespace lora {
template <typename T>
std::string to_bin(T v, int element_len_bits) {
T mask = 0;
unsigned int maxpow = element_len_bits;
std::string result = "";
for(int i = 0; i < maxpow; i++) {
mask = pow(2, i);
//std::cout << (unsigned int)v << " AND " << mask << " is " << (v & mask) << std::endl;
if((v & mask) > 0) {
result += "1";
} else {
result += "0";
}
}
return result;
}
template <typename T>
inline void print_vector(std::vector<T>& v, std::string prefix, int element_len_bits) {
std::cout << prefix << ": ";
for(int i = 0; i < v.size(); i++) {
std::cout << to_bin(v[i], element_len_bits) << ", ";
}
std::cout << std::endl << std::flush;
}
bool check_parity(std::string word, bool even) {
int count = 0;
for(int i = 0; i < 7; i++) {
if(word[i] == '1')
count += 1;
}
if(even)
return ((count % 2) == 0);
else
return (((count+1) % 2) == 0);
}
}
}
#endif /* UTILITIES_H */

1
python/CMakeLists.txt
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@ -42,3 +42,4 @@ include(GrTest)
set(GR_TEST_TARGET_DEPS gnuradio-lora)
set(GR_TEST_PYTHON_DIRS ${CMAKE_BINARY_DIR}/swig)
GR_ADD_TEST(qa_receiver ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_receiver.py)

9
python/lora_decoder.py
Wyświetl plik

@ -217,9 +217,13 @@ def shuffled_hamming(coded, prng):
for bit in bit_order:
deshuffle += coded[bit]
printd("S: " + str(deshuffle))
# Dewhiten
dewhiten = xor_byte(deshuffle, prng)
printd("W: " + str(dewhiten))
# Decode
decode, error = hamming_decode(dewhiten[:-1], powers_of_two_pos=[0, 1, 3], even=True)
@ -415,6 +419,9 @@ class lora_decoder(gr.basic_block):
self.demodulated = ""
self.state = LoRaState.FIND_SYNC
def calc_energy(self, samples):
return numpy.sum(numpy.square(numpy.abs(samples)))
def general_work(self, input_items, output_items):
in0 = input_items[0]
in1 = input_items[1]
@ -423,6 +430,8 @@ class lora_decoder(gr.basic_block):
num_output_items = len(output_items[0])
if self.state == LoRaState.FIND_SYNC:
#if self.calc_energy(in1[0:32]) > 0.08:
# print("Found packet")
smooth_function = numpy.convolve(signal.gaussian(32, std=12), in0, mode='same') / 32.0
for i in range(0, num_output_items):
out[i] = len(self.sync_buffer) / 10

45
python/lora_receiver.py
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@ -24,35 +24,58 @@ from lora_decoder import lora_decoder
from gnuradio.filter import freq_xlating_fir_filter_ccf, firdes, fractional_resampler_cc
from gnuradio.analog import quadrature_demod_cf
from gnuradio.blocks import null_sink
import lora
class lora_receiver(gr.hier_block2):
"""
docstring for block lora_receiver
"""
def __init__(self, in_samp_rate, freq, offset):
def __init__(self, in_samp_rate, freq, offset, finetune, realtime):
gr.hier_block2.__init__(self,
"lora_receiver", # Min, Max, gr.sizeof_<type>
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(0, 0, 0)) # Output signature
# Parameters
self.finetune = finetune
self.offset = offset
self.in_samp_rate = in_samp_rate
self.realtime = realtime
bw = 125000
# Define blocks
null1 = null_sink(gr.sizeof_float)
null2 = null_sink(gr.sizeof_float)
decoder = lora_decoder()
if realtime:
self.c_decoder = lora.decoder(finetune)
out_samp_rate = 1000000
decimation = 1
else:
decoder = lora_decoder()
out_samp_rate = 10000000
decimation = 10
out_samp_rate = 10000000
bw = 125000
lpf = firdes.low_pass(1, out_samp_rate, bw, 10000, firdes.WIN_HAMMING, 6.67)
qdemod = quadrature_demod_cf(1.0)
channelizer = freq_xlating_fir_filter_ccf(10, lpf, offset, out_samp_rate)
channelizer = freq_xlating_fir_filter_ccf(decimation, lpf, offset, out_samp_rate)
resampler = fractional_resampler_cc(0, in_samp_rate / float(out_samp_rate))
# Connect blocks
self.connect((self, 0), (resampler, 0))
self.connect((resampler, 0), (channelizer, 0))
self.connect((channelizer, 0), (qdemod, 0))
self.connect((channelizer, 0), (decoder, 1))
self.connect((qdemod, 0), (decoder, 0))
self.connect((decoder, 0), (null1, 0))
self.connect((decoder, 1), (null2, 0))
if realtime:
self.connect((channelizer, 0), (self.c_decoder, 0))
else:
self.connect((channelizer, 0), (qdemod, 0))
self.connect((channelizer, 0), (decoder, 1))
self.connect((qdemod, 0), (decoder, 0))
self.connect((decoder, 0), (null1, 0))
self.connect((decoder, 1), (null2, 0))
def get_finetune(self):
return self.finetune
def set_finetune(self, finetune):
self.finetune = finetune
if self.realtime:
self.c_decoder.set_finetune(self.finetune)

698
python/qa_receiver.py 100755
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@ -0,0 +1,698 @@
#!/usr/bin/env python2
# -*- coding: utf-8 -*-
# GNU GENERAL PUBLIC LICENSE
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from gnuradio import gr, gr_unittest
from gnuradio import blocks
import lora_swig as lora
class qa_receiver (gr_unittest.TestCase):
def setUp (self):
self.tb = gr.top_block ()
def tearDown (self):
self.tb = None
def test_001_t (self):
# set up fg
self.tb.run ()
# check data
if __name__ == '__main__':
gr_unittest.run(qa_receiver, "qa_receiver.xml")

3
swig/lora_swig.i
Wyświetl plik

@ -8,6 +8,9 @@
%include "lora_swig_doc.i"
%{
#include "lora/decoder.h"
%}
%include "lora/decoder.h"
GR_SWIG_BLOCK_MAGIC2(lora, decoder);