1 files changed, 160 insertions, 0 deletions
diff --git a/gnuradio-examples/python/usrp/fm_tx_2_daughterboards.py b/gnuradio-examples/python/usrp/fm_tx_2_daughterboards.py
new file mode 100755
index 000000000..1cb161018
--- /dev/null
+++ b/gnuradio-examples/python/usrp/fm_tx_2_daughterboards.py
@@ -0,0 +1,160 @@
+#!/usr/bin/env python
+
+"""
+Transmit 2 signals, one out each daughterboard.
+
+Outputs SSB (USB) signals on side A and side B at frequencies
+specified on command line.
+
+Side A is 600 Hz tone.
+Side B is 350 + 440 Hz tones.
+"""
+
+from gnuradio import gr
+from gnuradio.eng_notation import num_to_str, str_to_num
+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
+
+
+class example_signal_0(gr.hier_block):
+    """
+    Sinusoid at 600 Hz.
+    """
+    def __init__(self, fg, sample_rate):
+
+        src = gr.sig_source_c (sample_rate,    # sample rate
+                               gr.GR_SIN_WAVE, # waveform type
+                               600,            # frequency
+                               1.0,            # amplitude
+                               0)              # DC Offset
+    
+        gr.hier_block.__init__(self, fg, None, src)
+
+
+class example_signal_1(gr.hier_block):
+    """
+    North American dial tone (350 + 440 Hz).
+    """
+    def __init__(self, fg, sample_rate):
+
+        src0 = gr.sig_source_c (sample_rate,    # sample rate
+                                gr.GR_SIN_WAVE, # waveform type
+                                350,            # frequency
+                                1.0,            # amplitude
+                                0)              # DC Offset
+
+        src1 = gr.sig_source_c (sample_rate,    # sample rate
+                                gr.GR_SIN_WAVE, # waveform type
+                                440,            # frequency
+                                1.0,            # amplitude
+                                0)              # DC Offset
+        sum = gr.add_cc()
+        fg.connect(src0, (sum, 0))
+        fg.connect(src1, (sum, 1))
+        
+        gr.hier_block.__init__(self, fg, None, sum)
+    
+
+
+class my_graph(gr.flow_graph):
+
+    def __init__(self):
+        gr.flow_graph.__init__ (self)
+
+        usage="%prog: [options] side-A-tx-freq side-B-tx-freq"
+        parser = OptionParser (option_class=eng_option, usage=usage)
+        (options, args) = parser.parse_args ()
+
+        if len(args) != 2:
+            parser.print_help()
+            raise SystemExit
+        else:
+            freq0 = str_to_num(args[0])
+            freq1 = str_to_num(args[1])
+
+        # ----------------------------------------------------------------
+        # Set up USRP to transmit on both daughterboards
+
+        self.u = usrp.sink_c(nchan=2)          # say we want two channels
+
+        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
+
+        # we're using both daughterboard slots, thus subdev is a 2-tuple
+        self.subdev = (self.u.db[0][0], self.u.db[1][0])
+        print "Using TX d'board %s" % (self.subdev[0].side_and_name(),)
+        print "Using TX d'board %s" % (self.subdev[1].side_and_name(),)
+        
+        # set up the Tx mux so that
+        #  channel 0 goes to Slot A I&Q and channel 1 to Slot B I&Q
+        self.u.set_mux(0xba98)
+
+        self.subdev[0].set_gain(self.subdev[0].gain_range()[1])    # set max Tx gain
+        self.subdev[1].set_gain(self.subdev[1].gain_range()[1])    # set max Tx gain
+
+        self.set_freq(0, freq0)
+        self.set_freq(1, freq1)
+        self.subdev[0].set_enable(True)             # enable transmitter
+        self.subdev[1].set_enable(True)             # enable transmitter
+
+        # ----------------------------------------------------------------
+        # build two signal sources, interleave them, amplify and connect them to usrp
+
+        sig0 = example_signal_0(self, self.usrp_rate)
+        sig1 = example_signal_1(self, self.usrp_rate)
+
+        intl = gr.interleave(gr.sizeof_gr_complex)
+        self.connect(sig0, (intl, 0))
+        self.connect(sig1, (intl, 1))
+
+        # apply some gain
+        if_gain = 10000
+        ifamp = gr.multiply_const_cc(if_gain)
+        
+        # and wire them up
+        self.connect(intl, ifamp, self.u)
+        
+
+    def set_freq(self, side, target_freq):
+        """
+        Set the center frequency we're interested in.
+
+        @param side: 0 = side A, 1 = side B
+        @param target_freq: frequency in Hz
+        @rtype: 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.
+        """
+
+        print "Tuning side %s to %sHz" % (("A", "B")[side], num_to_str(target_freq))
+        r = self.u.tune(self.subdev[side]._which, self.subdev[side], target_freq)
+        if r:
+            print "  r.baseband_freq =", num_to_str(r.baseband_freq)
+            print "  r.dxc_freq      =", num_to_str(r.dxc_freq)
+            print "  r.residual_freq =", num_to_str(r.residual_freq)
+            print "  r.inverted      =", r.inverted
+            print "  OK"
+            return True
+
+        else:
+            print "  Failed!"
+            
+        return False
+
+
+if __name__ == '__main__':
+    try:
+        my_graph().run()
+    except KeyboardInterrupt:
+        pass