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Refactored modes_rx to use a more modular radio interface (radio.py) using a pubsub pattern to formalize the old "outputs" interface I was using. Should make it easier to reuse the radio interface.

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This commit is contained in:
Nick Foster 2013-05-27 19:50:42 -07:00
parent 3e9854f337
commit db34eca30e
4 changed files with 171 additions and 133 deletions
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158
apps/modes_rx
View File

@ -1,5 +1,5 @@
#!/usr/bin/env python
# Copyright 2010 Nick Foster
# Copyright 2010, 2013 Nick Foster
#
# This file is part of gr-air-modes
#
@ -21,120 +21,26 @@
my_position = None
from gnuradio import gr, gru, optfir, eng_notation, blks2
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import time, os, sys, threading
from string import split, join
import air_modes
import gnuradio.gr.gr_threading as _threading
import csv
from air_modes.exceptions import *
class top_block_runner(_threading.Thread):
def __init__(self, tb):
_threading.Thread.__init__(self)
self.setDaemon(1)
self.tb = tb
self.done = False
self.start()
def run(self):
self.tb.run()
self.done = True
class adsb_rx_block (gr.top_block):
def __init__(self, options, args, queue):
gr.top_block.__init__(self)
self.options = options
self.args = args
rate = int(options.rate)
use_resampler = False
if options.filename is None and options.udp is None and not options.rtlsdr:
#UHD source by default
from gnuradio import uhd
self.u = uhd.single_usrp_source(options.args, uhd.io_type_t.COMPLEX_FLOAT32, 1)
time_spec = uhd.time_spec(0.0)
self.u.set_time_now(time_spec)
#if(options.rx_subdev_spec is None):
# options.rx_subdev_spec = ""
#self.u.set_subdev_spec(options.rx_subdev_spec)
if not options.antenna is None:
self.u.set_antenna(options.antenna)
self.u.set_samp_rate(rate)
rate = int(self.u.get_samp_rate()) #retrieve actual
if options.gain is None: #set to halfway
g = self.u.get_gain_range()
options.gain = (g.start()+g.stop()) / 2.0
if not(self.tune(options.freq)):
print "Failed to set initial frequency"
print "Setting gain to %i" % options.gain
self.u.set_gain(options.gain)
print "Gain is %i" % self.u.get_gain()
elif options.rtlsdr: #RTLSDR dongle
import osmosdr
self.u = osmosdr.source_c(options.args)
self.u.set_sample_rate(3.2e6) #fixed for RTL dongles
if not self.u.set_center_freq(options.freq):
print "Failed to set initial frequency"
self.u.set_gain_mode(0) #manual gain mode
if options.gain is None:
options.gain = 34
self.u.set_gain(options.gain)
print "Gain is %i" % self.u.get_gain()
use_resampler = True
else:
if options.filename is not None:
self.u = gr.file_source(gr.sizeof_gr_complex, options.filename)
elif options.udp is not None:
self.u = gr.udp_source(gr.sizeof_gr_complex, "localhost", options.udp)
else:
raise Exception("No valid source selected")
print "Rate is %i" % (rate,)
pass_all = 0
if options.output_all :
pass_all = 1
self.rx_path = air_modes.rx_path(rate, options.threshold, queue, options.pmf)
if use_resampler:
self.lpfiltcoeffs = gr.firdes.low_pass(1, 5*3.2e6, 1.6e6, 300e3)
self.resample = blks2.rational_resampler_ccf(interpolation=5, decimation=4, taps=self.lpfiltcoeffs)
self.connect(self.u, self.resample, self.rx_path)
else:
self.connect(self.u, self.rx_path)
def tune(self, freq):
result = self.u.set_center_freq(freq, 0)
return result
def printraw(msg):
print msg
if __name__ == '__main__':
usage = "%prog: [options] output filename"
parser = OptionParser(option_class=eng_option, usage=usage)
parser.add_option("-R", "--rx-subdev-spec", type="string",
help="select USRP Rx side A or B", metavar="SUBDEV")
parser.add_option("-R", "--subdev", type="string",
help="select USRP Rx side A or B", metavar="SUBDEV")
parser.add_option("-A", "--antenna", type="string",
help="select which antenna to use on daughterboard")
help="select which antenna to use on daughterboard")
parser.add_option("-D", "--args", type="string",
help="arguments to pass to UHD/RTL constructor", default="")
help="arguments to pass to radio constructor", default="")
parser.add_option("-f", "--freq", type="eng_float", default=1090e6,
help="set receive frequency in Hz [default=%default]", metavar="FREQ")
parser.add_option("-g", "--gain", type="int", default=None,
@ -146,7 +52,7 @@ if __name__ == '__main__':
parser.add_option("-a","--output-all", action="store_true", default=False,
help="output all frames")
parser.add_option("-F","--filename", type="string", default=None,
help="read data from file instead of USRP")
help="read data from file instead of USRP")
parser.add_option("-K","--kml", type="string", default=None,
help="filename for Google Earth KML output")
parser.add_option("-P","--sbs1", action="store_true", default=False,
@ -168,19 +74,18 @@ if __name__ == '__main__':
(options, args) = parser.parse_args()
tb = air_modes.modes_radio(options)
updates = []
if options.location is not None:
reader = csv.reader([options.location], quoting=csv.QUOTE_NONNUMERIC)
my_position = reader.next()
queue = gr.msg_queue()
outputs = [] #registry of plugin output functions
updates = [] #registry of plugin update functions
if options.raw is True:
rawport = air_modes.raw_server(9988) #port
outputs.append(rawport.output)
outputs.append(printraw)
tb.subscribe('dl_data', rawport.output)
tb.subscribe('dl_data', printraw)
updates.append(rawport.add_pending_conns)
if options.kml is not None:
@ -189,23 +94,22 @@ if __name__ == '__main__':
lock = threading.Lock()
sqldb = air_modes.output_sql(my_position, dbname, lock) #input into the db
kmlgen = air_modes.output_kml(options.kml, dbname, my_position, lock) #create a KML generating thread to read from the db
outputs.append(sqldb.output)
tb.subscribe('dl_data', sqldb.output)
if options.sbs1 is True:
sbs1port = air_modes.output_sbs1(my_position, 30003)
outputs.append(sbs1port.output)
tb.subscribe('dl_data', sbs1port.output)
updates.append(sbs1port.add_pending_conns)
if options.no_print is not True:
outputs.append(air_modes.output_print(my_position).output)
tb.subscribe('dl_data', air_modes.output_print(my_position).output)
if options.multiplayer is not None:
[fghost, fgport] = options.multiplayer.split(':')
fgout = air_modes.output_flightgear(my_position, fghost, int(fgport))
outputs.append(fgout.output)
tb.subscribe('dl_data', fgout.output)
fg = adsb_rx_block(options, args, queue)
runner = top_block_runner(fg)
tb.start()
while 1:
try:
@ -214,26 +118,14 @@ if __name__ == '__main__':
#until the next output arrives
for update in updates:
update()
time.sleep(0.1)
#main message handler
if not queue.empty_p() :
while not queue.empty_p() :
msg = queue.delete_head() #blocking read
for out in outputs:
try:
out(msg.to_string())
except air_modes.ADSBError:
pass
elif runner.done:
raise KeyboardInterrupt
else:
time.sleep(0.1)
except KeyboardInterrupt:
fg.stop()
runner = None
if options.kml is not None:
kmlgen.done = True
break
tb.stop()
tb.wait()
if options.kml is not None:
kmlgen.done = True

1
python/CMakeLists.txt
View File

@ -41,6 +41,7 @@ GR_PYTHON_INSTALL(
kml.py
parse.py
msprint.py
radio.py
raw_server.py
rx_path.py
sbs1.py

1
python/__init__.py
View File

@ -58,6 +58,7 @@ from sql import output_sql
from sbs1 import output_sbs1
from kml import output_kml
from raw_server import raw_server
from radio import modes_radio
from exceptions import *
from az_map import *
#this is try/excepted in case the user doesn't have numpy installed

144
python/radio.py Normal file
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@ -0,0 +1,144 @@
# Copyright 2013 Nick Foster
#
# This file is part of gr-air-modes
#
# gr-air-modes 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.
#
# gr-air-modes 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 gr-air-modes; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
# Radio interface for Mode S RX.
# Handles all Gnuradio-related functionality.
# You pass it options, it gives you data.
# It uses the pubsub interface to allow clients to subscribe to its data feeds.
from gnuradio import gr, gru, optfir, eng_notation, blks2
from gnuradio.eng_option import eng_option
from gnuradio.gr.pubsub import pubsub
import air_modes
DOWNLINK_DATA_TYPE = 'dl_data'
class modes_radio (gr.top_block, pubsub):
def __init__(self, options):
gr.top_block.__init__(self)
pubsub.__init__(self)
self._options = options
self._queue = gr.msg_queue()
rate = int(options.rate)
use_resampler = False
self.time_source = None
self._setup_source(options)
self.subscribe('gain', self.set_gain)
self.subscribe('freq', self.set_freq)
self['gain'] = options.gain
self['freq'] = options.freq
self['rate'] = options.rate
self['filename'] = options.filename
#TODO allow setting rate, threshold (drill down into slicer & preamble)
self.rx_path = air_modes.rx_path(rate, options.threshold, self._queue, options.pmf)
if use_resampler:
self.lpfiltcoeffs = gr.firdes.low_pass(1, 5*3.2e6, 1.6e6, 300e3)
self.resample = blks2.rational_resampler_ccf(interpolation=5, decimation=4, taps=self.lpfiltcoeffs)
self.connect(self._u, self.resample, self.rx_path)
else:
self.connect(self._u, self.rx_path)
#Publish messages when they come back off the queue
self._async_rcv = gru.msgq_runner(self._queue, self.async_callback)
def async_callback(self, msg):
self[DOWNLINK_DATA_TYPE] = msg.to_string()
#these are wrapped with try/except because file sources and udp sources
#don't have set_center_freq/set_gain functions. this should check to see
#the type of self._u.
def set_freq(self, freq):
try:
result = self._u.set_center_freq(freq, 0)
return result
except:
pass
def set_gain(self, gain):
try:
self._u.set_gain(gain)
except:
pass
def _setup_source(self, options):
if options.filename is None and options.udp is None and options.rtlsdr is None:
#UHD source by default
from gnuradio import uhd
self._u = uhd.single_usrp_source(options.args, uhd.io_type_t.COMPLEX_FLOAT32, 1)
if(options.subdev):
self._u.set_subdev_spec(options.subdev, 0)
#check for GPSDO
#if you have a GPSDO, UHD will automatically set the timestamp to UTC time
#as well as automatically set the clock to lock to GPSDO.
if self._u.get_time_source(0) == 'gpsdo':
self._time_source = 'gpsdo'
else:
self._time_source = None
self._u.set_time_now(uhd.time_spec(0.0))
if options.antenna is not None:
self._u.set_antenna(options.antenna)
self._u.set_samp_rate(rate)
rate = int(self._u.get_samp_rate()) #retrieve actual
if options.gain is None: #set to halfway
g = self._u.get_gain_range()
options.gain = (g.start()+g.stop()) / 2.0
print "Setting gain to %i" % options.gain
self._u.set_gain(options.gain)
print "Gain is %i" % self._u.get_gain()
elif options.rtlsdr: #RTLSDR dongle
import osmosdr
self._u = osmosdr.source_c(options.args)
self._u.set_sample_rate(3.2e6) #fixed for RTL dongles
if not self._u.set_center_freq(options.freq):
print "Failed to set initial frequency"
self._u.set_gain_mode(0) #manual gain mode
if options.gain is None:
options.gain = 34
self._u.set_gain(options.gain)
print "Gain is %i" % self._u.get_gain()
use_resampler = True
else:
if options.filename is not None:
self._u = gr.file_source(gr.sizeof_gr_complex, options.filename)
elif options.udp is not None:
self._u = gr.udp_source(gr.sizeof_gr_complex, "localhost", options.udp)
else:
raise Exception("No valid source selected")
print "Rate is %i" % (options.rate,)