1 files changed, 128 insertions, 0 deletions
diff --git a/gnuradio-examples/python/multi-antenna/multi_fft.py b/gnuradio-examples/python/multi-antenna/multi_fft.py
new file mode 100755
index 000000000..ca9c614a8
--- /dev/null
+++ b/gnuradio-examples/python/multi-antenna/multi_fft.py
@@ -0,0 +1,128 @@
+#!/usr/bin/env python
+
+from gnuradio import gr, gru, eng_notation
+from gnuradio import usrp
+from gnuradio.eng_option import eng_option
+from gnuradio import eng_notation
+from gnuradio import optfir
+from optparse import OptionParser
+from gnuradio.wxgui import stdgui, fftsink, waterfallsink, scopesink, form, slider
+import wx
+import usrp_dbid
+import time
+import os.path
+import sys
+
+# required FPGA that can do 4 rx channels.
+
+
+class my_graph(stdgui.gui_flow_graph):
+
+    def __init__(self, frame, panel, vbox, argv):
+        stdgui.gui_flow_graph.__init__(self)
+
+        self.frame = frame
+        self.panel = panel
+
+        parser = OptionParser (option_class=eng_option)
+        #parser.add_option("-S", "--subdev", type="subdev", default=(0, None),
+        #                  help="select USRP Rx side A or B (default=A)")
+        parser.add_option("-d", "--decim", type="int", default=128,
+                          help="set fgpa decimation rate to DECIM [default=%default]")
+        parser.add_option("-f", "--freq", type="eng_float", default=146.585e6,
+                          help="set frequency to FREQ [default=%default])", metavar="FREQ")
+        parser.add_option("-g", "--gain", type="eng_float", default=20,
+                          help="set gain in dB [default=%default]")
+        parser.add_option("-F", "--filter", action="store_true", default=True,
+                          help="Enable channel filter")
+        (options, args) = parser.parse_args()
+
+        if len(args) != 0:
+            parser.print_help()
+            raise SystemExit
+
+        nchan = 4
+
+        if options.filter:
+            sw_decim = 4
+        else:
+            sw_decim = 1
+
+        self.u = usrp.source_c(0, options.decim, fpga_filename="std_4rx_0tx.rbf")
+        if self.u.nddc() < nchan:
+            sys.stderr.write('This code requires an FPGA build with %d DDCs.  This FPGA has only %d.\n' % (
+                nchan, self.u.nddc()))
+            raise SystemExit
+                             
+        if not self.u.set_nchannels(nchan):
+            sys.stderr.write('set_nchannels(%d) failed\n' % (nchan,))
+            raise SystemExit
+        
+        input_rate = self.u.adc_freq() / self.u.decim_rate()
+        print "USB data rate   = %s" % (eng_notation.num_to_str(input_rate),)
+        print "Scope data rate = %s" % (eng_notation.num_to_str(input_rate/sw_decim),)
+
+        self.subdev = self.u.db[0] + self.u.db[1]
+
+        if (len (self.subdev) != 4 or
+            self.u.db[0][0].dbid() != usrp_dbid.BASIC_RX or
+            self.u.db[1][0].dbid() != usrp_dbid.BASIC_RX):
+            sys.stderr.write('This code requires a Basic Rx board on Sides A & B\n')
+            sys.exit(1)
+
+        self.u.set_mux(gru.hexint(0xf3f2f1f0))
+
+        # deinterleave four channels from FPGA
+        di = gr.deinterleave(gr.sizeof_gr_complex)
+
+        self.connect(self.u, di)
+        
+
+
+        # taps for channel filter
+        chan_filt_coeffs = optfir.low_pass (1,           # gain
+                                            input_rate,  # sampling rate
+                                            80e3,        # passband cutoff
+                                            115e3,       # stopband cutoff
+                                            0.1,         # passband ripple
+                                            60)          # stopband attenuation
+        #print len(chan_filt_coeffs)
+
+        for i in range(nchan):
+            scope = fftsink.fft_sink_c(self, panel, sample_rate=input_rate/sw_decim,
+                                       title="Input %d" % (i,),
+                                       ref_level=80, y_per_div=20)
+            vbox.Add(scope.win, 10, wx.EXPAND)
+
+            if options.filter:
+                chan_filt = gr.fir_filter_ccf(sw_decim, chan_filt_coeffs)
+                self.connect((di, i), chan_filt, scope)
+            else:
+                self.connect((di, i), scope)
+
+
+        self.set_gain(options.gain)
+        self.set_freq(options.freq)
+
+    def set_gain(self, gain):
+        for i in range(len(self.subdev)):
+            self.subdev[i].set_gain(gain)
+
+    def set_freq(self, target_freq):
+        ok = True
+        for i in range(len(self.subdev)):
+            r = usrp.tune(self.u, i, self.subdev[i], target_freq)
+            if not r:
+                ok = False
+                print "set_freq: failed to set subdev[%d] freq to %f" % (
+                    i, target_freq)
+
+        return ok
+
+
+def main ():
+    app = stdgui.stdapp(my_graph, "Multi Scope", nstatus=1)
+    app.MainLoop()
+
+if __name__ == '__main__':
+    main ()