1 files changed, 107 insertions, 0 deletions
diff --git a/gnuradio-examples/python/usrp/usrp_rx_cfile.py b/gnuradio-examples/python/usrp/usrp_rx_cfile.py
new file mode 100755
index 000000000..306e101d3
--- /dev/null
+++ b/gnuradio-examples/python/usrp/usrp_rx_cfile.py
@@ -0,0 +1,107 @@
+#!/usr/bin/env python
+
+"""
+Read samples from the USRP and write to file formatted as binary
+outputs single precision complex float values or complex short values (interleaved 16 bit signed short integers).
+
+"""
+
+from gnuradio import gr, eng_notation
+from gnuradio import audio
+from gnuradio import usrp
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+
+class my_graph(gr.flow_graph):
+
+    def __init__(self):
+        gr.flow_graph.__init__(self)
+
+        usage="%prog: [options] output_filename"
+        parser = OptionParser(option_class=eng_option, usage=usage)
+        parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=(0, 0),
+                          help="select USRP Rx side A or B (default=A)")
+        parser.add_option("-d", "--decim", type="int", default=16,
+                          help="set fgpa decimation rate to DECIM [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("-8", "--width-8", action="store_true", default=False,
+                          help="Enable 8-bit samples across USB")
+        parser.add_option( "--no-hb", action="store_true", default=False,
+                          help="don't use halfband filter in usrp")
+        parser.add_option( "-s","--output-shorts", action="store_true", default=False,
+                          help="output interleaved shorts in stead of complex floats")
+        parser.add_option("-N", "--nsamples", type="eng_float", default=None,
+                          help="number of samples to collect [default=+inf]")
+        (options, args) = parser.parse_args ()
+        if len(args) != 1:
+            parser.print_help()
+            raise SystemExit, 1
+        filename = args[0]
+
+        if options.freq is None:
+            parser.print_help()
+            sys.stderr.write('You must specify the frequency with -f FREQ\n');
+            raise SystemExit, 1
+
+        # build the graph
+        if options.no_hb or (options.decim<8):
+          self.fpga_filename="std_4rx_0tx.rbf" #Min decimation of this firmware is 4. contains 4 Rx paths without halfbands and 0 tx paths.
+          if options.output_shorts:
+            self.u = usrp.source_s(decim_rate=options.decim,fpga_filename=self.fpga_filename)
+          else:
+            self.u = usrp.source_c(decim_rate=options.decim,fpga_filename=self.fpga_filename)
+        else:
+          #standard fpga firmware "std_2rxhb_2tx.rbf" contains 2 Rx paths with halfband filters and 2 tx paths (the default) min decimation 8
+          if options.output_shorts:
+            self.u = usrp.source_s(decim_rate=options.decim)
+          else:
+            self.u = usrp.source_c(decim_rate=options.decim)
+        if options.width_8:
+            sample_width = 8
+            sample_shift = 8
+            format = self.u.make_format(sample_width, sample_shift)
+            r = self.u.set_format(format)
+        if options.output_shorts:
+          self.dst = gr.file_sink(gr.sizeof_short, filename)
+        else:
+          self.dst = gr.file_sink(gr.sizeof_gr_complex, filename)
+        if options.nsamples is None:
+            self.connect(self.u, self.dst)
+        else:
+            if options.output_shorts:
+              self.head = gr.head(gr.sizeof_short, int(options.nsamples)*2)
+            else:
+              self.head = gr.head(gr.sizeof_gr_complex, int(options.nsamples))
+            self.connect(self.u, self.head, self.dst)
+
+        if options.rx_subdev_spec is None:
+            options.rx_subdev_spec = usrp.pick_rx_subdevice(self.u)
+        self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
+
+        # determine the daughterboard subdevice we're using
+        self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
+        print "Using RX d'board %s" % (self.subdev.side_and_name(),)
+        input_rate = self.u.adc_freq() / self.u.decim_rate()
+        print "USB sample rate %s" % (eng_notation.num_to_str(input_rate))
+
+        if options.gain is None:
+            # if no gain was specified, use the mid-point in dB
+            g = self.subdev.gain_range()
+            options.gain = float(g[0]+g[1])/2
+
+        self.subdev.set_gain(options.gain)
+
+        r = self.u.tune(0, self.subdev, options.freq)
+        if not r:
+            sys.stderr.write('Failed to set frequency\n')
+            raise SystemExit, 1
+
+        
+if __name__ == '__main__':
+    try:
+        my_graph().run()
+    except KeyboardInterrupt:
+        pass