From 8f06fda1f4c19d06e4a4f9da22b2d692148fe4bc Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Mon, 3 Oct 2011 20:42:55 -0400
Subject: uhd: moved fm_tx4 from gnuradio-examples to gr-uhd/examples
---
gr-uhd/examples/fm_tx4.py | 205 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 205 insertions(+)
create mode 100755 gr-uhd/examples/fm_tx4.py
(limited to 'gr-uhd/examples/fm_tx4.py')
diff --git a/gr-uhd/examples/fm_tx4.py b/gr-uhd/examples/fm_tx4.py
new file mode 100755
index 0000000000..9b39752c17
--- /dev/null
+++ b/gr-uhd/examples/fm_tx4.py
@@ -0,0 +1,205 @@
+#!/usr/bin/env python
+#
+# Copyright 2005-2007,2011 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio 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.
+#
+# GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+"""
+Transmit N simultaneous narrow band FM signals.
+
+They will be centered at the frequency specified on the command line,
+and will spaced at 25kHz steps from there.
+
+The program opens N files with names audio-N.dat where N is in [0,7].
+These files should contain floating point audio samples in the range [-1,1]
+sampled at 32kS/sec. You can create files like this using
+audio_to_file.py
+"""
+
+from gnuradio import gr, eng_notation
+from gnuradio import uhd
+from gnuradio import blks2
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+from usrpm import usrp_dbid
+import math
+import sys
+
+from gnuradio.wxgui import stdgui2, fftsink2
+import wx
+
+
+########################################################
+# instantiate one transmit chain for each call
+
+class pipeline(gr.hier_block2):
+ def __init__(self, filename, lo_freq, audio_rate, if_rate):
+
+ gr.hier_block2.__init__(self, "pipeline",
+ gr.io_signature(0, 0, 0),
+ gr.io_signature(1, 1, gr.sizeof_gr_complex))
+
+ try:
+ src = gr.file_source (gr.sizeof_float, filename, True)
+ except RuntimeError:
+ sys.stderr.write(("\nError: Could not open file '%s'\n\n" % \
+ filename))
+ sys.exit(1)
+
+ print audio_rate, if_rate
+ fmtx = blks2.nbfm_tx (audio_rate, if_rate, max_dev=5e3, tau=75e-6)
+
+ # Local oscillator
+ lo = gr.sig_source_c (if_rate, # sample rate
+ gr.GR_SIN_WAVE, # waveform type
+ lo_freq, #frequency
+ 1.0, # amplitude
+ 0) # DC Offset
+ mixer = gr.multiply_cc ()
+
+ self.connect (src, fmtx, (mixer, 0))
+ self.connect (lo, (mixer, 1))
+ self.connect (mixer, self)
+
+class fm_tx_block(stdgui2.std_top_block):
+ def __init__(self, frame, panel, vbox, argv):
+ MAX_CHANNELS = 7
+ stdgui2.std_top_block.__init__ (self, frame, panel, vbox, argv)
+
+ parser = OptionParser (option_class=eng_option)
+ parser.add_option("-a", "--address", type="string",
+ default="addr=192.168.10.2",
+ help="Address of UHD device, [default=%default]")
+ parser.add_option("-A", "--antenna", type="string", default=None,
+ help="select Rx Antenna where appropriate")
+ parser.add_option("-s", "--samp-rate", type="eng_float", default=400e3,
+ help="set sample rate (bandwidth) [default=%default]")
+ parser.add_option("-f", "--freq", type="eng_float", default=None,
+ help="set frequency to FREQ", metavar="FREQ")
+ parser.add_option("-g", "--gain", type="eng_float", default=None,
+ help="set gain in dB (default is midpoint)")
+ parser.add_option("-n", "--nchannels", type="int", default=4,
+ help="number of Tx channels [1,4]")
+ #parser.add_option("","--debug", action="store_true", default=False,
+ # help="Launch Tx debugger")
+ (options, args) = parser.parse_args ()
+
+ if len(args) != 0:
+ parser.print_help()
+ sys.exit(1)
+
+ if options.nchannels < 1 or options.nchannels > MAX_CHANNELS:
+ sys.stderr.write ("fm_tx4: nchannels out of range. Must be in [1,%d]\n" % MAX_CHANNELS)
+ sys.exit(1)
+
+ if options.freq is None:
+ sys.stderr.write("fm_tx4: must specify frequency with -f FREQ\n")
+ parser.print_help()
+ sys.exit(1)
+
+ # ----------------------------------------------------------------
+ # Set up constants and parameters
+
+ self.u = uhd.usrp_sink(device_addr=options.address,
+ io_type=uhd.io_type.COMPLEX_FLOAT32,
+ num_channels=1)
+
+ self.usrp_rate = options.samp_rate
+ self.u.set_samp_rate(self.usrp_rate)
+ self.usrp_rate = self.u.get_samp_rate()
+
+ self.sw_interp = 10
+ self.audio_rate = self.usrp_rate / self.sw_interp # 32 kS/s
+
+ if options.gain is None:
+ # if no gain was specified, use the mid-point in dB
+ g = self.u.get_gain_range()
+ options.gain = float(g.start()+g.stop())/2
+
+ self.set_gain(options.gain)
+ self.set_freq(options.freq)
+
+ if(options.antenna):
+ self.u.set_antenna(options.antenna, 0)
+
+ self.sum = gr.add_cc ()
+
+ # Instantiate N NBFM channels
+ step = 25e3
+ offset = (0 * step, 1 * step, -1 * step,
+ 2 * step, -2 * step, 3 * step, -3 * step)
+
+ for i in range (options.nchannels):
+ t = pipeline("audio-%d.dat" % (i % 4), offset[i],
+ self.audio_rate, self.usrp_rate)
+ self.connect(t, (self.sum, i))
+
+ self.gain = gr.multiply_const_cc (1.0 / options.nchannels)
+
+ # connect it all
+ self.connect (self.sum, self.gain)
+ self.connect (self.gain, self.u)
+
+ # plot an FFT to verify we are sending what we want
+ if 1:
+ post_mod = fftsink2.fft_sink_c(panel, title="Post Modulation",
+ fft_size=512,
+ sample_rate=self.usrp_rate,
+ y_per_div=20,
+ ref_level=40)
+ self.connect (self.gain, post_mod)
+ vbox.Add (post_mod.win, 1, wx.EXPAND)
+
+
+ #if options.debug:
+ # self.debugger = tx_debug_gui.tx_debug_gui(self.subdev)
+ # self.debugger.Show(True)
+
+
+ def set_freq(self, target_freq):
+ """
+ Set the center frequency we're interested in.
+
+ @param target_freq: frequency in Hz
+ @rypte: bool
+
+ Tuning is a two step process. First we ask the front-end to
+ tune as close to the desired frequency as it can. Then we use
+ the result of that operation and our target_frequency to
+ determine the value for the digital up converter. Finally, we feed
+ any residual_freq to the s/w freq translater.
+ """
+
+ r = self.u.set_center_freq(target_freq, 0)
+ if r:
+ print "Frequency =", eng_notation.num_to_str(self.u.get_center_freq())
+ return True
+
+ return False
+
+ def set_gain(self, gain):
+ self.u.set_gain(gain, 0)
+
+
+def main ():
+ app = stdgui2.stdapp(fm_tx_block, "Multichannel FM Tx", nstatus=1)
+ app.MainLoop ()
+
+if __name__ == '__main__':
+ main ()
--
cgit v1.2.3