uhd: moved NBFM examples to gr-uhd/examples directory and made work with UHD.

author: Tom Rondeau <trondeau@vt.edu> 2011-10-04 17:26:23 -0400
committer: Tom Rondeau <trondeau@vt.edu> 2011-10-04 17:47:14 -0400
commit: 0fb09639fbbdae15e8efce953999eba8e4c223a2 (patch)
tree: c1cdae9cb59b4e865183040ae1fabf0da572c43e /gr-uhd/examples
parent: ed1e88e7da68513cd80dda770dc2034391e71917 (diff)
3 files changed, 853 insertions, 1 deletions
diff --git a/gr-uhd/examples/Makefile.am b/gr-uhd/examples/Makefile.am
index de4a453ff4..ca27819ae8 100644
--- a/gr-uhd/examples/Makefile.am
+++ b/gr-uhd/examples/Makefile.am
@@ -28,4 +28,6 @@ ourdatadir = $(exampledir)/uhd
 dist_ourdata_SCRIPTS =		\
 	fm_tx4.py		\
 	max_power.py		\
-	usrp_am_mw_rcv.py
+	usrp_am_mw_rcv.py	\
+	usrp_nbfm_ptt.py	\
+	usrp_nbfm_rcv.py
diff --git a/gr-uhd/examples/usrp_nbfm_ptt.py b/gr-uhd/examples/usrp_nbfm_ptt.py
new file mode 100755
index 0000000000..af3b132f43
--- /dev/null
+++ b/gr-uhd/examples/usrp_nbfm_ptt.py
@@ -0,0 +1,474 @@
+#!/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.
+# 
+
+import math
+import sys
+import wx
+from optparse import OptionParser
+
+from gnuradio import gr, audio, blks2, uhd
+from gnuradio.eng_option import eng_option
+from gnuradio.wxgui import stdgui2, fftsink2, scopesink2, slider, form
+from usrpm import usrp_dbid
+
+from numpy import convolve, array
+
+#import os
+#print "pid =", os.getpid()
+#raw_input('Press Enter to continue: ')
+
+# ////////////////////////////////////////////////////////////////////////
+#                           Control Stuff
+# ////////////////////////////////////////////////////////////////////////
+
+class ptt_block(stdgui2.std_top_block):
+    def __init__(self, frame, panel, vbox, argv):
+        stdgui2.std_top_block.__init__ (self, frame, panel, vbox, argv)
+
+        self.frame = frame
+        self.space_bar_pressed = False
+        
+        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 ("-f", "--freq", type="eng_float", default=442.1e6,
+                           help="set Tx and Rx frequency to FREQ", metavar="FREQ")
+        parser.add_option ("-g", "--rx-gain", type="eng_float", default=None,
+                           help="set rx gain [default=midpoint in dB]")
+        parser.add_option ("", "--tx-gain", type="eng_float", default=None,
+                           help="set tx gain [default=midpoint in dB]")
+        parser.add_option("-I", "--audio-input", type="string", default="",
+                          help="pcm input device name.  E.g., hw:0,0 or /dev/dsp")
+        parser.add_option("-O", "--audio-output", type="string", default="",
+                          help="pcm output device name.  E.g., hw:0,0 or /dev/dsp")
+        parser.add_option ("-N", "--no-gui", action="store_true", default=False)
+        (options, args) = parser.parse_args ()
+
+        if len(args) != 0:
+            parser.print_help()
+            sys.exit(1)
+
+        if options.freq < 1e6:
+            options.freq *= 1e6
+            
+        self.txpath = transmit_path(options.address, options.tx_gain,
+                                    options.audio_input)
+        self.rxpath = receive_path(options.address, options.rx_gain,
+                                   options.audio_output)
+	self.connect(self.txpath)
+	self.connect(self.rxpath)
+
+        self._build_gui(frame, panel, vbox, argv, options.no_gui)
+
+        self.set_transmit(False)
+        self.set_freq(options.freq)
+        self.set_rx_gain(self.rxpath.gain)               # update gui
+        self.set_volume(self.rxpath.volume)              # update gui
+        self.set_squelch(self.rxpath.threshold())        # update gui
+
+
+    def set_transmit(self, enabled):
+        self.txpath.set_enable(enabled)
+        self.rxpath.set_enable(not(enabled))
+        if enabled:
+            self.frame.SetStatusText ("Transmitter ON", 1)
+        else:
+            self.frame.SetStatusText ("Receiver ON", 1)
+
+
+    def set_rx_gain(self, gain):
+        self.myform['rx_gain'].set_value(gain)            # update displayed value
+        self.rxpath.set_gain(gain)
+        
+    def set_tx_gain(self, gain):
+        self.txpath.set_gain(gain)
+
+    def set_squelch(self, threshold):
+        self.rxpath.set_squelch(threshold)
+        self.myform['squelch'].set_value(self.rxpath.threshold())
+
+    def set_volume (self, vol):
+        self.rxpath.set_volume(vol)
+        self.myform['volume'].set_value(self.rxpath.volume)
+        #self.update_status_bar ()
+
+    def set_freq(self, freq):
+        r1 = self.txpath.set_freq(freq)
+        r2 = self.rxpath.set_freq(freq)
+        #print "txpath.set_freq =", r1
+        #print "rxpath.set_freq =", r2
+        if r1 and r2:
+            self.myform['freq'].set_value(freq)     # update displayed value
+        return r1 and r2
+
+    def _build_gui(self, frame, panel, vbox, argv, no_gui):
+
+        def _form_set_freq(kv):
+            return self.set_freq(kv['freq'])
+            
+        self.panel = panel
+        
+        # FIXME This REALLY needs to be replaced with a hand-crafted button
+        # that sends both button down and button up events
+        hbox = wx.BoxSizer(wx.HORIZONTAL)
+        hbox.Add((10,0), 1)
+        self.status_msg = wx.StaticText(panel, -1, "Press Space Bar to Transmit")
+        of = self.status_msg.GetFont()
+        self.status_msg.SetFont(wx.Font(15, of.GetFamily(), of.GetStyle(), of.GetWeight()))
+        hbox.Add(self.status_msg, 0, wx.ALIGN_CENTER)
+        hbox.Add((10,0), 1)
+        vbox.Add(hbox, 0, wx.EXPAND | wx.ALIGN_CENTER)
+
+        panel.Bind(wx.EVT_KEY_DOWN, self._on_key_down)
+        panel.Bind(wx.EVT_KEY_UP, self._on_key_up)
+        panel.Bind(wx.EVT_KILL_FOCUS, self._on_kill_focus)
+        panel.SetFocus()
+
+        if 1 and not(no_gui):
+            rx_fft = fftsink2.fft_sink_c(panel, title="Rx Input", fft_size=512,
+                                         sample_rate=self.rxpath.if_rate,
+                                         ref_level=80, y_per_div=20)
+            self.connect (self.rxpath.u, rx_fft)
+            vbox.Add (rx_fft.win, 1, wx.EXPAND)
+
+        if 1 and not(no_gui):
+            rx_fft = fftsink2.fft_sink_c(panel, title="Post s/w Resampler",
+                                         fft_size=512, sample_rate=self.rxpath.quad_rate,
+                                         ref_level=80, y_per_div=20)
+            self.connect (self.rxpath.resamp, rx_fft)
+            vbox.Add (rx_fft.win, 1, wx.EXPAND)
+
+        if 0 and not(no_gui):
+            foo = scopesink2.scope_sink_f(panel, title="Squelch",
+                                    	  sample_rate=32000)
+            self.connect (self.rxpath.fmrx.div, (foo,0))
+            self.connect (self.rxpath.fmrx.gate, (foo,1))
+            self.connect (self.rxpath.fmrx.squelch_lpf, (foo,2))
+            vbox.Add (foo.win, 1, wx.EXPAND)
+
+        if 0 and not(no_gui):
+            tx_fft = fftsink2.fft_sink_c(panel, title="Tx Output",
+                                         fft_size=512, sample_rate=self.txpath.usrp_rate)
+            self.connect (self.txpath.amp, tx_fft)
+            vbox.Add (tx_fft.win, 1, wx.EXPAND)
+
+
+        # add control area at the bottom
+
+        self.myform = myform = form.form()
+
+        # first row
+        hbox = wx.BoxSizer(wx.HORIZONTAL)
+        hbox.Add((5,0), 0, 0)
+        myform['freq'] = form.float_field(
+            parent=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, 0)
+        vbox.Add(hbox, 0, wx.EXPAND)
+
+
+        # second row
+        hbox = wx.BoxSizer(wx.HORIZONTAL)
+        myform['volume'] = \
+            form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
+                                        weight=3, range=self.rxpath.volume_range(),
+                                        callback=self.set_volume)
+        hbox.Add((5,0), 0)
+        myform['squelch'] = \
+            form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Squelch",
+                                        weight=3, range=self.rxpath.squelch_range(),
+                                        callback=self.set_squelch)
+            
+        g = self.rxpath.u.get_gain_range()
+        hbox.Add((5,0), 0)
+        myform['rx_gain'] = \
+            form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Rx Gain",
+                                        weight=3, range=(g.start(), g.stop(), g.step()),
+                                        callback=self.set_rx_gain)
+        hbox.Add((5,0), 0)
+        vbox.Add(hbox, 0, wx.EXPAND)
+
+
+        self._build_subpanel(vbox)
+
+    def _build_subpanel(self, vbox_arg):
+        # build a secondary information panel (sometimes hidden)
+
+        # FIXME figure out how to have this be a subpanel that is always
+        # created, but has its visibility controlled by foo.Show(True/False)
+        
+        #if not(self.show_debug_info):
+        #    return
+
+        panel = self.panel
+        vbox = vbox_arg
+        myform = self.myform
+
+        #panel = wx.Panel(self.panel, -1)
+        #vbox = wx.BoxSizer(wx.VERTICAL)
+
+        hbox = wx.BoxSizer(wx.HORIZONTAL)
+        hbox.Add((5,0), 0)
+        #myform['decim'] = form.static_float_field(
+        #    parent=panel, sizer=hbox, label="Decim")
+
+        #hbox.Add((5,0), 1)
+        #myform['fs@usb'] = form.static_float_field(
+        #    parent=panel, sizer=hbox, label="Fs@USB")
+
+        #hbox.Add((5,0), 1)
+        #myform['dbname'] = form.static_text_field(
+        #    parent=panel, sizer=hbox)
+
+        hbox.Add((5,0), 0)
+        vbox.Add(hbox, 0, wx.EXPAND)
+
+
+    def _set_status_msg(self, msg, which=0):
+        self.frame.GetStatusBar().SetStatusText(msg, which)
+
+    def _on_key_down(self, evt):
+        # print "key_down:", evt.m_keyCode
+        if evt.m_keyCode == wx.WXK_SPACE and not(self.space_bar_pressed):
+            self.space_bar_pressed = True
+            self.set_transmit(True)
+
+    def _on_key_up(self, evt):
+        # print "key_up", evt.m_keyCode
+        if evt.m_keyCode == wx.WXK_SPACE:
+            self.space_bar_pressed = False
+            self.set_transmit(False)
+
+    def _on_kill_focus(self, evt):
+        # if we lose the keyboard focus, turn off the transmitter
+        self.space_bar_pressed = False
+        self.set_transmit(False)
+        
+
+# ////////////////////////////////////////////////////////////////////////
+#                           Transmit Path
+# ////////////////////////////////////////////////////////////////////////
+
+class transmit_path(gr.hier_block2):
+    def __init__(self, address, gain, audio_input):
+	gr.hier_block2.__init__(self, "transmit_path",
+				gr.io_signature(0, 0, 0), # Input signature
+				gr.io_signature(0, 0, 0)) # Output signature
+				
+        self.u = uhd.usrp_sink(device_addr=address,
+                               io_type=uhd.io_type.COMPLEX_FLOAT32,
+                               num_channels=1)
+
+        self.if_rate = 320e3
+        self.audio_rate = 32e3
+
+        self.u.set_samp_rate(self.if_rate)
+        dev_rate = self.u.get_samp_rate()
+
+        self.audio_gain = 10
+        self.normal_gain = 32000
+
+        self.audio = audio.source(int(self.audio_rate), audio_input)
+        self.audio_amp = gr.multiply_const_ff(self.audio_gain)
+
+        lpf = gr.firdes.low_pass (1,                  # gain
+                                  self.audio_rate,    # sampling rate
+                                  3800,               # low pass cutoff freq
+                                  300,                # width of trans. band
+                                  gr.firdes.WIN_HANN) # filter type 
+
+        hpf = gr.firdes.high_pass (1,                 # gain
+                                  self.audio_rate,    # sampling rate
+                                  325,                # low pass cutoff freq
+                                  50,                 # width of trans. band
+                                  gr.firdes.WIN_HANN) # filter type 
+
+        audio_taps = convolve(array(lpf),array(hpf))
+        self.audio_filt = gr.fir_filter_fff(1,audio_taps)
+
+        self.pl = blks2.ctcss_gen_f(self.audio_rate,123.0)
+        self.add_pl = gr.add_ff()
+        self.connect(self.pl,(self.add_pl,1))
+
+        self.fmtx = blks2.nbfm_tx(self.audio_rate, self.if_rate)
+        self.amp = gr.multiply_const_cc (self.normal_gain)
+
+        rrate = dev_rate / self.if_rate
+        self.resamp = blks2.pfb_arb_resampler_ccf(rrate)
+
+        self.connect(self.audio, self.audio_amp, self.audio_filt,
+                     (self.add_pl,0), self.fmtx, self.amp,
+                     self.resamp, self.u)
+
+        if gain is None:
+            # if no gain was specified, use the mid-point in dB
+            g = self.u.get_gain_range()
+            gain = float(g.start() + g.stop())/2.0
+
+        self.set_gain(gain)
+
+        self.set_enable(False)
+
+    def set_freq(self, target_freq):
+        """
+        Set the center frequency we're interested in.
+
+        @param target_freq: frequency in Hz
+        @rypte: bool
+        """
+        r = self.u.set_center_freq(target_freq)
+        if r:
+            return True
+        return False
+
+    def set_gain(self, gain):
+        self.gain = gain
+        self.u.set_gain(gain)
+
+    def set_enable(self, enable):
+        if enable:
+            self.amp.set_k (self.normal_gain)
+        else:
+            self.amp.set_k (0)
+
+
+
+# ////////////////////////////////////////////////////////////////////////
+#                           Receive Path
+# ////////////////////////////////////////////////////////////////////////
+
+class receive_path(gr.hier_block2):
+    def __init__(self, address, gain, audio_output):
+	gr.hier_block2.__init__(self, "receive_path",
+				gr.io_signature(0, 0, 0), # Input signature
+				gr.io_signature(0, 0, 0)) # Output signature
+
+        self.u = uhd.usrp_source(device_addr=address,
+                                 io_type=uhd.io_type.COMPLEX_FLOAT32,
+                                 num_channels=1)
+
+        self.if_rate    = 256e3
+        self.quad_rate  = 64e3
+        self.audio_rate = 32e3
+
+        self.u.set_samp_rate(self.if_rate)
+        dev_rate = self.u.get_samp_rate()
+
+        # Create filter to get actual channel we want
+        nfilts = 32
+        chan_coeffs = gr.firdes.low_pass (nfilts,             # gain
+                                          nfilts*dev_rate,    # sampling rate
+                                          13e3,               # low pass cutoff freq
+                                          4e3,                # width of trans. band
+                                          gr.firdes.WIN_HANN) # filter type 
+
+        rrate = self.quad_rate / dev_rate
+        self.resamp = blks2.pfb_arb_resampler_ccf(rrate, chan_coeffs, nfilts)
+
+        # instantiate the guts of the single channel receiver
+        self.fmrx = blks2.nbfm_rx(self.audio_rate, self.quad_rate)
+
+        # standard squelch block
+        self.squelch = blks2.standard_squelch(self.audio_rate)
+
+        # audio gain / mute block
+        self._audio_gain = gr.multiply_const_ff(1.0)
+
+        # sound card as final sink
+        audio_sink = audio.sink (int(self.audio_rate), audio_output)
+        
+        # now wire it all together
+        self.connect (self.u, self.resamp, self.fmrx, self.squelch,
+                      self._audio_gain, audio_sink)
+
+        if gain is None:
+            # if no gain was specified, use the mid-point in dB
+            g = self.u.get_gain_range()
+            gain = float(g.start() + g.stop())/2.0
+
+        self.enabled = True
+        self.set_gain(gain)
+        v = self.volume_range()
+        self.set_volume((v[0]+v[1])/2)
+        s = self.squelch_range()
+        self.set_squelch((s[0]+s[1])/2)
+        
+        
+    def volume_range(self):
+        return (-20.0, 0.0, 0.5)
+
+    def set_volume (self, vol):
+        g = self.volume_range()
+        self.volume = max(g[0], min(g[1], vol))
+        self._update_audio_gain()
+
+    def set_enable(self, enable):
+        self.enabled = enable
+        self._update_audio_gain()
+
+    def _update_audio_gain(self):
+        if self.enabled:
+            self._audio_gain.set_k(10**(self.volume/10))
+        else:
+            self._audio_gain.set_k(0)
+
+    def squelch_range(self):
+        return self.squelch.squelch_range()
+    
+    def set_squelch(self, threshold):
+        print "SQL =", threshold
+        self.squelch.set_threshold(threshold)
+
+    def threshold(self):
+        return self.squelch.threshold()
+    
+    def set_freq(self, target_freq):
+        """
+        Set the center frequency we're interested in.
+
+        @param target_freq: frequency in Hz
+        @rypte: bool
+        """
+        r = self.u.set_center_freq(target_freq)
+        if r:
+            return True
+        return False
+
+    def set_gain(self, gain):
+        self.gain = gain
+        self.u.set_gain(gain)
+
+
+# ////////////////////////////////////////////////////////////////////////
+#                                Main
+# ////////////////////////////////////////////////////////////////////////
+
+def main():
+    app = stdgui2.stdapp(ptt_block, "NBFM Push to Talk")
+    app.MainLoop()
+
+if __name__ == '__main__':
+    main()
diff --git a/gr-uhd/examples/usrp_nbfm_rcv.py b/gr-uhd/examples/usrp_nbfm_rcv.py
new file mode 100755
index 0000000000..2dc69423cc
--- /dev/null
+++ b/gr-uhd/examples/usrp_nbfm_rcv.py
@@ -0,0 +1,376 @@
+#!/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, audio, blks2, uhd
+from gnuradio.eng_option import eng_option
+from gnuradio.wxgui import slider, powermate
+from gnuradio.wxgui import stdgui2, fftsink2, form
+from optparse import OptionParser
+import sys
+import math
+import wx
+
+#////////////////////////////////////////////////////////////////////////
+#                           Control Stuff
+#////////////////////////////////////////////////////////////////////////
+
+class my_top_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("-f", "--freq", type="eng_float", default=146.585e6,
+                          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("-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")
+        parser.add_option("-N", "--no-gui", action="store_true", default=False)
+
+        (options, args) = parser.parse_args()
+        if len(args) != 0:
+            parser.print_help()
+            sys.exit(1)
+        
+        if options.freq < 1e6:
+            options.freq *= 1e6
+            
+        self.frame = frame
+        self.panel = panel
+        
+        self.state = "FREQ"
+        self.freq = 0
+        self.freq_step = 25e3
+
+        self.rxpath = receive_path(options.address, options.antenna,
+                                   options.gain, options.audio_output)
+	self.connect(self.rxpath)
+	
+        self._build_gui(vbox, options.no_gui)
+
+        # set initial values
+
+        if options.volume is not None:
+            self.set_volume(options.volume)
+
+        if not(self.set_freq(options.freq)):
+            self._set_status_msg("Failed to set initial frequency")
+
+        self.set_gain(self.rxpath.gain)               # update gui
+        self.set_volume(self.rxpath.volume)           # update gui
+        self.set_squelch(self.rxpath.threshold())     # update gui
+
+
+    def _set_status_msg(self, msg, which=0):
+        self.frame.GetStatusBar().SetStatusText(msg, which)
+
+
+    def _build_gui(self, vbox, no_gui):
+
+        def _form_set_freq(kv):
+            return self.set_freq(kv['freq'])
+
+
+        self.src_fft = None
+        if 0 and not(no_gui):
+            self.src_fft = fftsink2.fft_sink_c(self.panel,
+                                               title="Data from USRP",
+                                               fft_size=512,
+                                               sample_rate=self.rxpath.if_rate,
+                                               ref_scale=32768.0,
+                                               ref_level=0,
+                                               y_per_div=10,
+                                               y_divs=12)
+            self.connect (self.rxpath.u, self.src_fft)
+            vbox.Add (self.src_fft.win, 4, wx.EXPAND)
+        if 1 and not(no_gui):
+            rx_fft = fftsink2.fft_sink_c(self.panel,
+                                         title="Post s/w Resampling",
+                                         fft_size=512,
+                                         sample_rate=self.rxpath.quad_rate,
+                                         ref_level=80,
+                                         y_per_div=20)
+            self.connect (self.rxpath.resamp, rx_fft)
+            vbox.Add (rx_fft.win, 4, wx.EXPAND)
+        
+        if 1 and not(no_gui):
+            post_deemph_fft = fftsink2.fft_sink_f(self.panel,
+                                                  title="Post Deemph",
+                                                  fft_size=512,
+                                                  sample_rate=self.rxpath.audio_rate,
+                                                  y_per_div=10,
+                                                  ref_level=-40)
+            self.connect (self.rxpath.fmrx.deemph, post_deemph_fft)
+            vbox.Add (post_deemph_fft.win, 4, wx.EXPAND)
+
+        if 0:
+            post_filt_fft = fftsink2.fft_sink_f(self.panel,
+                                                title="Post Filter", 
+                                                fft_size=512,
+                                                sample_rate=audio_rate,
+                                                y_per_div=10,
+                                                ref_level=-40)
+            self.connect (self.guts.audio_filter, post_filt)
+            vbox.Add (fft_win4, 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=(87.9e6, 108.1e6, 0.1e6),
+        #                                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_volume)
+        hbox.Add((5,0), 0)
+        myform['squelch'] = \
+            form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Squelch",
+                                        weight=3, range=self.rxpath.squelch_range(),
+                                        callback=self.set_squelch)
+        g = self.rxpath.u.get_gain_range()
+        hbox.Add((5,0), 0)
+        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 + self.freq_step)
+                self.rot -= 3
+            elif self.rot <=-3:
+                self.set_freq(self.freq - self.freq_step)
+                self.rot += 3
+        else:
+            step = self.volume_range()[2]
+            if self.rot >= 3:
+                self.set_volume(self.rxpath.volume + step)
+                self.rot -= 3
+            elif self.rot <=-3:
+                self.set_volume(self.rxpath.volume - 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_squelch(self, threshold_in_db):
+        self.rxpath.set_squelch(threshold_in_db)
+        self.myform['squelch'].set_value(self.rxpath.threshold())
+
+    def set_volume (self, vol):
+        self.rxpath.set_volume(vol)
+        self.myform['volume'].set_value(self.rxpath.volume)
+        self.update_status_bar ()
+                                        
+    def set_freq(self, target_freq):
+        r = self.rxpath.set_freq(target_freq)
+        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.rxpath.set_gain(gain)
+
+    def update_status_bar (self):
+        msg = "Volume:%r  Setting:%s" % (self.rxpath.volume, self.state)
+        self._set_status_msg(msg, 1)
+        if self.src_fft:
+            self.src_fft.set_baseband_freq(self.freq)
+
+    def volume_range(self):
+        return (-20.0, 0.0, 0.5)
+        
+
+#////////////////////////////////////////////////////////////////////////
+#                           Receive Path
+#////////////////////////////////////////////////////////////////////////
+
+USE_SIMPLE_SQUELCH = False
+
+class receive_path(gr.hier_block2):
+    def __init__(self, address, antenna, gain, audio_output):
+	gr.hier_block2.__init__(self, "receive_path",
+				gr.io_signature(0, 0, 0), # Input signature
+				gr.io_signature(0, 0, 0)) # Output signature
+
+        self.u = uhd.usrp_source(device_addr=address,
+                                 io_type=uhd.io_type.COMPLEX_FLOAT32,
+                                 num_channels=1)
+
+        self.if_rate    = 256e3
+        self.quad_rate  = 64e3
+        self.audio_rate = 32e3
+
+        self.u.set_samp_rate(self.if_rate)
+        dev_rate = self.u.get_samp_rate()
+
+        # Create filter to get actual channel we want
+        nfilts = 32
+        chan_coeffs = gr.firdes.low_pass (nfilts,              # gain
+                                          nfilts*dev_rate,     # sampling rate
+                                          8e3,                 # low pass cutoff freq
+                                          2e3,                 # width of trans. band
+                                          gr.firdes.WIN_HANN)  # filter type 
+        rrate = self.quad_rate / dev_rate
+        self.resamp = blks2.pfb_arb_resampler_ccf(rrate, chan_coeffs, nfilts)
+
+        if USE_SIMPLE_SQUELCH:
+            self.squelch = gr.simple_squelch_cc(20)
+        else:
+            self.squelch = blks2.standard_squelch(self.audio_rate)
+
+        # instantiate the guts of the single channel receiver
+        self.fmrx = blks2.nbfm_rx(self.audio_rate, self.quad_rate)
+
+        # audio gain / mute block
+        self._audio_gain = gr.multiply_const_ff(1.0)
+
+        # sound card as final sink
+        audio_sink = audio.sink (int(self.audio_rate), audio_output)
+        
+        # now wire it all together
+        if USE_SIMPLE_SQUELCH:
+            self.connect (self.u, self.resamp, self.squelch, self.fmrx,
+                          self._audio_gain, audio_sink)
+        else:
+            self.connect (self.u, self.resamp, self.fmrx, self.squelch,
+                          self._audio_gain, audio_sink)
+
+        if gain is None:
+            # if no gain was specified, use the mid-point in dB
+            g = self.u.get_gain_range()
+            gain = float(g.start()+g.stop())/2
+
+        self.set_gain(gain)
+
+        v = self.volume_range()
+        self.set_volume((v[0]+v[1])/2)
+
+        s = self.squelch_range()
+        self.set_squelch((s[0]+s[1])/2)
+
+        if(antenna):
+            self.u.set_antenna(antenna, 0)
+
+    def volume_range(self):
+        return (-20.0, 0.0, 0.5)
+
+    def set_volume (self, vol):
+        g = self.volume_range()
+        self.volume = max(g[0], min(g[1], vol))
+        self._update_audio_gain()
+
+    def _update_audio_gain(self):
+        self._audio_gain.set_k(10**(self.volume/10))
+        
+    def squelch_range(self):
+        r = self.squelch.squelch_range()
+        #print "squelch_range: ", r
+        return r
+    
+    def set_squelch(self, threshold):
+        #print "SQL =", threshold
+        self.squelch.set_threshold(threshold)
+
+    def threshold(self):
+        t = self.squelch.threshold()
+        #print "t =", t
+        return t
+
+    def set_freq(self, target_freq):
+        """
+        Set the center frequency we're interested in.
+
+        @param target_freq: frequency in Hz
+        @rypte: bool
+        """
+
+        r = self.u.set_center_freq(target_freq)
+        if r:
+            return True
+        return False
+
+    def set_gain(self, gain):
+        self.gain = gain
+        self.u.set_gain(gain)
+
+
+# ////////////////////////////////////////////////////////////////////////
+#                                Main
+# ////////////////////////////////////////////////////////////////////////
+
+if __name__ == '__main__':
+    app = stdgui2.stdapp (my_top_block, "USRP NBFM RX")
+    app.MainLoop ()
author	Tom Rondeau <trondeau@vt.edu>	2011-10-04 17:26:23 -0400
committer	Tom Rondeau <trondeau@vt.edu>	2011-10-04 17:47:14 -0400
commit	0fb09639fbbdae15e8efce953999eba8e4c223a2 (patch)
tree	c1cdae9cb59b4e865183040ae1fabf0da572c43e /gr-uhd/examples
parent	ed1e88e7da68513cd80dda770dc2034391e71917 (diff)