uhd: moved usrp_am_mw_rcv from examples to gr-uhd/examples and made work with UHD. Needs more testing.

author: Tom Rondeau <trondeau@vt.edu> 2011-10-04 11:54:09 -0400
committer: Tom Rondeau <trondeau@vt.edu> 2011-10-04 11:54:09 -0400
commit: 6d722ac1d496aae386652c2a5f7876e48d1baef5 (patch)
tree: 118f7049afcd868176d7f13beab42d2515256174 /gr-uhd/examples
parent: c31f55b0d3ed62f006b99c9df9d12cc63f06a568 (diff)
2 files changed, 320 insertions, 3 deletions
diff --git a/gr-uhd/examples/Makefile.am b/gr-uhd/examples/Makefile.am
index c0965390a5..de4a453ff4 100644
--- a/gr-uhd/examples/Makefile.am
+++ b/gr-uhd/examples/Makefile.am
@@ -25,6 +25,7 @@ SUBDIRS = multi-antenna
 
 ourdatadir = $(exampledir)/uhd
 
-dist_ourdata_SCRIPTS =	\
-	fm_tx4.py	\
-	max_power.py
+dist_ourdata_SCRIPTS =		\
+	fm_tx4.py		\
+	max_power.py		\
+	usrp_am_mw_rcv.py
diff --git a/gr-uhd/examples/usrp_am_mw_rcv.py b/gr-uhd/examples/usrp_am_mw_rcv.py
new file mode 100755
index 0000000000..b9132e45a7
--- /dev/null
+++ b/gr-uhd/examples/usrp_am_mw_rcv.py
@@ -0,0 +1,316 @@
+#!/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.
+# 
+
+from gnuradio import gr, eng_notation, optfir
+from gnuradio import audio
+from gnuradio import uhd
+from gnuradio import blks2
+from gnuradio.eng_option import eng_option
+from gnuradio.wxgui import slider, powermate
+from gnuradio.wxgui import stdgui2, fftsink2, form
+from optparse import OptionParser
+from usrpm import usrp_dbid
+import sys
+import math
+import wx
+
+class wfm_rx_block (stdgui2.std_top_block):
+    def __init__(self, frame, panel, vbox, argv):
+        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=1e6,
+                          help="set sample rate (bandwidth) [default=%default]")
+        parser.add_option("-f", "--freq", type="eng_float", default=1008.0e3,
+                          help="set frequency to FREQ", metavar="FREQ")
+        parser.add_option("-I", "--use-if-freq", action="store_true", default=False,
+                          help="use intermediate freq (compensates DC problems in quadrature boards)" )
+        parser.add_option("-g", "--gain", type="eng_float", default=None,
+                          help="set gain in dB (default is maximum)")
+        parser.add_option("-V", "--volume", type="eng_float", default=None,
+                          help="set volume (default is midpoint)")
+        parser.add_option("-O", "--audio-output", type="string", default="",
+                          help="pcm device name.  E.g., hw:0,0 or surround51 or /dev/dsp")
+
+        (options, args) = parser.parse_args()
+        if len(args) != 0:
+            parser.print_help()
+            sys.exit(1)
+        
+        self.frame = frame
+        self.panel = panel
+        self.use_IF=options.use_if_freq
+        if self.use_IF:
+          self.IF_freq=64000.0 
+        else:
+          self.IF_freq=0.0
+        
+        self.vol = 0
+        self.state = "FREQ"
+        self.freq = 0
+
+        # build graph
+
+        #TODO: add an AGC after the channel filter and before the AM_demod
+        
+        self.u = uhd.usrp_source(device_addr=options.address,
+                                 io_type=uhd.io_type.COMPLEX_FLOAT32,
+                                 num_channels=1)
+        
+        usrp_rate = 256e3
+        self.u.set_samp_rate(usrp_rate)
+        usrp_rate = self.u.get_samp_rate()
+        
+        chanfilt_decim = 4
+        demod_rate = usrp_rate / chanfilt_decim     # 64 kHz
+        audio_decimation = 2
+        audio_rate = demod_rate / audio_decimation  # 32 kHz
+        
+        chan_filt_coeffs = gr.firdes.low_pass_2 (1,           # gain
+                                                 usrp_rate,   # sampling rate
+                                                 8e3,         # passband cutoff
+                                                 4e3,         # transition bw
+                                                 60)          # stopband attenuation
+
+        #print len(chan_filt_coeffs)
+        self.chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
+
+        if self.use_IF:
+          # Turn If to baseband and filter.
+          self.chan_filt = gr.freq_xlating_fir_filter_ccf (chanfilt_decim,
+                                                           chan_filt_coeffs,
+                                                           self.IF_freq,
+                                                           usrp_rate)
+        else:
+          self.chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
+        self.am_demod = gr.complex_to_mag()
+
+        self.volume_control = gr.multiply_const_ff(self.vol)
+
+        audio_filt_coeffs = gr.firdes.low_pass_2 (1,          # gain
+                                                  demod_rate, # sampling rate
+                                                  8e3,        # passband cutoff
+                                                  2e3,        # transition bw
+                                                  60)         # stopband attenuation
+
+        self.audio_filt=gr.fir_filter_fff(audio_decimation,audio_filt_coeffs)
+        # sound card as final sink
+        self.audio_sink = audio.sink (int (audio_rate),
+                                      options.audio_output,
+                                      False)  # ok_to_block
+        
+        # now wire it all together
+        self.connect (self.u, self.chan_filt, self.am_demod,
+                      self.audio_filt, self.volume_control,
+                      self.audio_sink)
+
+        self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
+
+        if options.gain is None:
+            g = self.u.get_gain_range()
+            if True:
+              # if no gain was specified, use the mid gain
+              options.gain = (g.start() + g.stop())/2.0
+
+        if options.volume is None:
+            v = self.volume_range()
+            options.volume = float(v[0]*3+v[1])/4.0
+            
+        if abs(options.freq) < 1e3:
+            options.freq *= 1e3
+
+        # set initial values
+
+        self.set_gain(options.gain)
+        self.set_vol(options.volume)
+        if not(self.set_freq(options.freq)):
+            self._set_status_msg("Failed to set initial frequency")
+
+        if(options.antenna):
+            self.u.set_antenna(options.antenna, 0)
+
+    def _set_status_msg(self, msg, which=0):
+        self.frame.GetStatusBar().SetStatusText(msg, which)
+
+
+    def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
+
+        def _form_set_freq(kv):
+            return self.set_freq(kv['freq'])
+
+
+        if 1:
+            self.src_fft = fftsink2.fft_sink_c(self.panel, title="Data from USRP",
+                                               fft_size=512, sample_rate=usrp_rate,
+					       ref_scale=32768.0, ref_level=0.0, y_divs=12)
+            self.connect (self.u, self.src_fft)
+            vbox.Add (self.src_fft.win, 4, wx.EXPAND)
+
+        if 0:
+            self.post_filt_fft = fftsink2.fft_sink_c(self.panel, title="Post Channel filter",
+                                               fft_size=512, sample_rate=demod_rate)
+            self.connect (self.chan_filt, self.post_filt_fft)
+            vbox.Add (self.post_filt_fft.win, 4, wx.EXPAND)
+
+        if 0:
+            post_demod_fft = fftsink2.fft_sink_f(self.panel, title="Post Demod", 
+                                                fft_size=1024, sample_rate=demod_rate,
+                                                y_per_div=10, ref_level=0)
+            self.connect (self.am_demod, post_demod_fft)
+            vbox.Add (post_demod_fft.win, 4, wx.EXPAND)
+
+        if 1:
+            audio_fft = fftsink2.fft_sink_f(self.panel, title="Audio",
+                                                  fft_size=512, sample_rate=audio_rate,
+                                                  y_per_div=10, ref_level=20)
+            self.connect (self.audio_filt, audio_fft)
+            vbox.Add (audio_fft.win, 4, wx.EXPAND)
+
+        
+        # control area form at bottom
+        self.myform = myform = form.form()
+
+        hbox = wx.BoxSizer(wx.HORIZONTAL)
+        hbox.Add((5,0), 0)
+        myform['freq'] = form.float_field(
+            parent=self.panel, sizer=hbox, label="Freq", weight=1,
+            callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
+
+        hbox.Add((5,0), 0)
+        myform['freq_slider'] = \
+            form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
+                                        range=(520.0e3, 1611.0e3, 1.0e3),
+                                        callback=self.set_freq)
+        hbox.Add((5,0), 0)
+        vbox.Add(hbox, 0, wx.EXPAND)
+
+        hbox = wx.BoxSizer(wx.HORIZONTAL)
+        hbox.Add((5,0), 0)
+
+        myform['volume'] = \
+            form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
+                                        weight=3, range=self.volume_range(),
+                                        callback=self.set_vol)
+        hbox.Add((5,0), 1)
+
+        g = self.u.get_gain_range()
+        myform['gain'] = \
+            form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
+                                        weight=3, range=(g.start(), g.stop(), g.step()),
+                                        callback=self.set_gain)
+        hbox.Add((5,0), 0)
+        vbox.Add(hbox, 0, wx.EXPAND)
+
+        try:
+            self.knob = powermate.powermate(self.frame)
+            self.rot = 0
+            powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
+            powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
+        except:
+            print "FYI: No Powermate or Contour Knob found"
+
+
+    def on_rotate (self, event):
+        self.rot += event.delta
+        if (self.state == "FREQ"):
+            if self.rot >= 3:
+                self.set_freq(self.freq + .1e6)
+                self.rot -= 3
+            elif self.rot <=-3:
+                self.set_freq(self.freq - .1e6)
+                self.rot += 3
+        else:
+            step = self.volume_range()[2]
+            if self.rot >= 3:
+                self.set_vol(self.vol + step)
+                self.rot -= 3
+            elif self.rot <=-3:
+                self.set_vol(self.vol - step)
+                self.rot += 3
+            
+    def on_button (self, event):
+        if event.value == 0:        # button up
+            return
+        self.rot = 0
+        if self.state == "FREQ":
+            self.state = "VOL"
+        else:
+            self.state = "FREQ"
+        self.update_status_bar ()
+        
+
+    def set_vol (self, vol):
+        g = self.volume_range()
+        self.vol = max(g[0], min(g[1], vol))
+        self.volume_control.set_k(10**(self.vol/10))
+        self.myform['volume'].set_value(self.vol)
+        self.update_status_bar ()
+                                        
+    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 down converter.
+        """
+        r = self.u.set_center_freq(target_freq  + self.IF_freq, 0)
+        
+        if r:
+            self.freq = target_freq
+            self.myform['freq'].set_value(target_freq)         # update displayed value
+            self.myform['freq_slider'].set_value(target_freq)  # update displayed value
+            self.update_status_bar()
+            self._set_status_msg("OK", 0)
+            return True
+
+        self._set_status_msg("Failed", 0)
+        return False
+
+    def set_gain(self, gain):
+        self.myform['gain'].set_value(gain)     # update displayed value
+        self.u.set_gain(gain)
+
+    def update_status_bar (self):
+        msg = "Volume:%r  Setting:%s" % (self.vol, self.state)
+        self._set_status_msg(msg, 1)
+        try:
+          self.src_fft.set_baseband_freq(self.freq)
+        except:
+          None
+          
+    def volume_range(self):
+        return (-40.0, 0.0, 0.5)
+        
+
+if __name__ == '__main__':
+    app = stdgui2.stdapp (wfm_rx_block, "USRP Broadcast AM MW RX")
+    app.MainLoop ()
author	Tom Rondeau <trondeau@vt.edu>	2011-10-04 11:54:09 -0400
committer	Tom Rondeau <trondeau@vt.edu>	2011-10-04 11:54:09 -0400
commit	6d722ac1d496aae386652c2a5f7876e48d1baef5 (patch)
tree	118f7049afcd868176d7f13beab42d2515256174 /gr-uhd/examples
parent	c31f55b0d3ed62f006b99c9df9d12cc63f06a568 (diff)