1 files changed, 117 insertions, 0 deletions
diff --git a/gr-pager/src/aypabtu.py b/gr-pager/src/aypabtu.py
new file mode 100755
index 000000000..c742744c3
--- /dev/null
+++ b/gr-pager/src/aypabtu.py
@@ -0,0 +1,117 @@
+#!/usr/bin/env python
+
+from math import pi
+from gnuradio import gr, gru, usrp, optfir, audio, eng_notation, blks, pager
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+from string import split, join, printable
+
+class usrp_source_c(gr.hier_block):
+    """
+    Create a USRP source object supplying complex floats.
+    
+    Selects user supplied subdevice or chooses first available one.
+
+    Calibration value is the offset from the tuned frequency to 
+    the actual frequency.       
+    """
+    def __init__(self, fg, subdev_spec, decim, gain=None, calibration=0.0):
+        self._decim = decim
+        self._src = usrp.source_c()
+        if subdev_spec is None:
+            subdev_spec = usrp.pick_rx_subdevice(self._src)
+        self._subdev = usrp.selected_subdev(self._src, subdev_spec)
+        self._src.set_mux(usrp.determine_rx_mux_value(self._src, subdev_spec))
+        self._src.set_decim_rate(self._decim)
+
+        # If no gain specified, set to midrange
+        if gain is None:
+            g = self._subdev.gain_range()
+            gain = (g[0]+g[1])/2.0
+
+        self._subdev.set_gain(gain)
+        self._cal = calibration
+
+        gr.hier_block.__init__(self, fg, self._src, self._src)
+
+    def tune(self, freq):
+        result = usrp.tune(self._src, 0, self._subdev, freq+self._cal)
+        # TODO: deal with residual
+
+    def rate(self):
+        return self._src.adc_rate()/self._decim
+
+class channelizer(blks.analysis_filterbank):
+    def __init__(self,
+		 fg,		# Flow graph
+		 if_rate,	# IF input sample rate (complex)
+		 channel_rate,	# Final channel sample rate (complex)
+		 channel_pass,	# Occupied spectrum for narrowband channel
+		 channel_stop):	# Total channel + guard band
+
+        num_channels = int(if_rate/channel_rate)
+        taps = optfir.low_pass(1.0, if_rate, channel_pass, channel_stop, 0.1, 60)
+        blks.analysis_filterbank.__init__(self, fg, num_channels, taps)
+
+class app_flow_graph(gr.flow_graph):
+    def __init__(self, options, args, queue):
+	gr.flow_graph.__init__(self)
+	self.options = options
+	self.args = args
+
+	# FIXME: Parameterize
+	#
+	# Difference between upper and lower must evenly divide into USRP sample rate
+	# and also must be divisible by 25000
+	options.channel_rate =     25000
+        options.channel_pass =      8000
+        options.channel_stop =     10000
+        	
+	if_rate = options.upper_freq - options.lower_freq
+	center_freq = options.lower_freq + if_rate/2
+	num_channels = int(if_rate/options.channel_rate)
+	decim = int(64000000/if_rate)
+		
+	self.SRC = usrp_source_c(self, options.rx_board, decim, options.gain, options.calibration)
+        self.CHAN = channelizer(self, if_rate, options.channel_rate, options.channel_pass, options.channel_stop)
+
+        self.connect(self.SRC, self.CHAN)
+	for i in range(num_channels):
+	    freq = options.lower_freq + i*options.channel_rate
+	    if freq > center_freq:
+		freq -= if_rate/2
+	    else:
+		freq += if_rate/2
+            FLEX = pager.flex_demod(self, options.channel_rate, queue)
+	    self.connect((self.CHAN, i), FLEX.INPUT)
+
+	self.SRC.tune(center_freq)
+
+def make_printable(data):
+    return "".join(char for char in data if char in printable)
+
+def main():
+    parser = OptionParser(option_class=eng_option)
+    parser.add_option("",   "--upper-freq",   type="eng_float", help="lower Rx frequency", metavar="LOWER")
+    parser.add_option("",   "--lower-freq",   type="eng_float", help="upper Rx frequency", metavar="UPPER")
+    parser.add_option("-R", "--rx-board",     type="subdev", help="select USRP Rx side A or B (default=first daughterboard found)", metavar="SIDE")
+    parser.add_option("-c", "--calibration",  type="eng_float", default=0.0, help="set frequency offset to Hz", metavar="Hz")
+    parser.add_option("-g", "--gain", 	    type="int", help="set RF gain", metavar="dB")
+    (options, args) = parser.parse_args()
+
+    # FIXME: parameter sanity checks
+
+    queue = gr.msg_queue()
+    fg = app_flow_graph(options, args, queue)
+    try:
+        fg.start()
+	while 1:
+	    msg = queue.delete_head() # Blocking read
+	    fields = split(msg.to_string(), chr(128))
+	    print join([make_printable(field) for field in fields], '|')
+
+    except KeyboardInterrupt:
+        fg.stop()
+
+if __name__ == "__main__":
+    main()