From 5d69a524f81f234b3fbc41d49ba18d6f6886baba Mon Sep 17 00:00:00 2001
From: jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Thu, 3 Aug 2006 04:51:51 +0000
Subject: Houston, we have a trunk.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3122 221aa14e-8319-0410-a670-987f0aec2ac5
---
gnuradio-examples/python/usrp/fm_tx4.py | 171 ++++++++++++++++++++++++++++++++
1 file changed, 171 insertions(+)
create mode 100755 gnuradio-examples/python/usrp/fm_tx4.py
(limited to 'gnuradio-examples/python/usrp/fm_tx4.py')
diff --git a/gnuradio-examples/python/usrp/fm_tx4.py b/gnuradio-examples/python/usrp/fm_tx4.py
new file mode 100755
index 0000000000..a9201b3f4d
--- /dev/null
+++ b/gnuradio-examples/python/usrp/fm_tx4.py
@@ -0,0 +1,171 @@
+#!/usr/bin/env python
+
+"""
+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 usrp
+from gnuradio import audio
+from gnuradio import blks
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+import usrp_dbid
+import math
+import sys
+
+from gnuradio.wxgui import stdgui, fftsink
+from gnuradio import tx_debug_gui
+import wx
+
+
+########################################################
+# instantiate one transmit chain for each call
+
+class pipeline(gr.hier_block):
+ def __init__(self, fg, filename, lo_freq, audio_rate, if_rate):
+
+ src = gr.file_source (gr.sizeof_float, filename, True)
+ fmtx = blks.nbfm_tx (fg, 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 ()
+
+ fg.connect (src, fmtx, (mixer, 0))
+ fg.connect (lo, (mixer, 1))
+
+ gr.hier_block.__init__(self, fg, src, mixer)
+
+
+
+class fm_tx_graph (stdgui.gui_flow_graph):
+ def __init__(self, frame, panel, vbox, argv):
+ MAX_CHANNELS = 7
+ stdgui.gui_flow_graph.__init__ (self, frame, panel, vbox, argv)
+
+ parser = OptionParser (option_class=eng_option)
+ parser.add_option("-T", "--tx-subdev-spec", type="subdev", default=None,
+ help="select USRP Tx side A or B")
+ parser.add_option("-f", "--freq", type="eng_float", default=None,
+ help="set Tx frequency to FREQ [required]", metavar="FREQ")
+ 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 = usrp.sink_c () # the USRP sink (consumes samples)
+
+ self.dac_rate = self.u.dac_rate() # 128 MS/s
+ self.usrp_interp = 400
+ self.u.set_interp_rate(self.usrp_interp)
+ self.usrp_rate = self.dac_rate / self.usrp_interp # 320 kS/s
+ self.sw_interp = 10
+ self.audio_rate = self.usrp_rate / self.sw_interp # 32 kS/s
+
+ # determine the daughterboard subdevice we're using
+ if options.tx_subdev_spec is None:
+ options.tx_subdev_spec = usrp.pick_tx_subdevice(self.u)
+
+ m = usrp.determine_tx_mux_value(self.u, options.tx_subdev_spec)
+ #print "mux = %#04x" % (m,)
+ self.u.set_mux(m)
+ self.subdev = usrp.selected_subdev(self.u, options.tx_subdev_spec)
+ print "Using TX d'board %s" % (self.subdev.side_and_name(),)
+
+ self.subdev.set_gain(self.subdev.gain_range()[1]) # set max Tx gain
+ self.set_freq(options.freq)
+ self.subdev.set_enable(True) # enable transmitter
+
+ 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 (self, "audio-%d.dat" % (i % 4), offset[i],
+ self.audio_rate, self.usrp_rate)
+ self.connect (t, (sum, i))
+
+ gain = gr.multiply_const_cc (4000.0 / options.nchannels)
+
+ # connect it all
+ self.connect (sum, gain)
+ self.connect (gain, self.u)
+
+ # plot an FFT to verify we are sending what we want
+ if 1:
+ post_mod = fftsink.fft_sink_c(self, panel, title="Post Modulation",
+ fft_size=512, sample_rate=self.usrp_rate,
+ y_per_div=20, ref_level=40)
+ self.connect (sum, 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.tune(self.subdev._which, self.subdev, target_freq)
+ if r:
+ print "r.baseband_freq =", eng_notation.num_to_str(r.baseband_freq)
+ print "r.dxc_freq =", eng_notation.num_to_str(r.dxc_freq)
+ print "r.residual_freq =", eng_notation.num_to_str(r.residual_freq)
+ print "r.inverted =", r.inverted
+
+ # Could use residual_freq in s/w freq translator
+ return True
+
+ return False
+
+def main ():
+ app = stdgui.stdapp (fm_tx_graph, "Multichannel FM Tx")
+ app.MainLoop ()
+
+if __name__ == '__main__':
+ main ()
--
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