#
-# Copyright 2005,2006 Free Software Foundation, Inc.
+# Copyright 2005, 2006, 2007 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# Boston, MA 02110-1301, USA.
#
-from gnuradio import gr, gru, blks
-from gnuradio import usrp
+from gnuradio import gr, gru, blks2
from gnuradio import eng_notation
import copy
import sys
-# from current dir
-from pick_bitrate import pick_tx_bitrate
-
# /////////////////////////////////////////////////////////////////////////////
# transmit path
# /////////////////////////////////////////////////////////////////////////////
-class transmit_path(gr.hier_block):
- def __init__(self, fg, modulator_class, options):
+class transmit_path(gr.hier_block2):
+ def __init__(self, modulator_class, options):
'''
See below for what options should hold
'''
-
+ gr.hier_block2.__init__(self, "transmit_path",
+ gr.io_signature(0, 0, 0), # Input signature
+ gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
+
options = copy.copy(options) # make a copy so we can destructively modify
self._verbose = options.verbose
- self._tx_freq = options.tx_freq # tranmitter's center frequency
self._tx_amplitude = options.tx_amplitude # digital amplitude sent to USRP
- self._tx_subdev_spec = options.tx_subdev_spec # daughterboard to use
self._bitrate = options.bitrate # desired bit rate
- self._interp = options.interp # interpolating rate for the USRP (prelim)
self._samples_per_symbol = options.samples_per_symbol # desired samples/baud
- self._fusb_block_size = options.fusb_block_size # usb info for USRP
- self._fusb_nblocks = options.fusb_nblocks # usb info for USRP
self._modulator_class = modulator_class # the modulator_class we are using
-
- if self._tx_freq is None:
- sys.stderr.write("-f FREQ or --freq FREQ or --tx-freq FREQ must be specified\n")
- raise SystemExit
-
- # Set up USRP sink; also adjusts interp, samples_per_symbol, and bitrate
- self._setup_usrp_sink()
-
- # copy the final answers back into options for use by modulator
- options.samples_per_symbol = self._samples_per_symbol
- options.bitrate = self._bitrate
- options.interp = self._interp
# Get mod_kwargs
mod_kwargs = self._modulator_class.extract_kwargs_from_options(options)
-
- # Set center frequency of USRP
- ok = self.set_freq(self._tx_freq)
- if not ok:
- print "Failed to set Tx frequency to %s" % (eng_notation.num_to_str(self._tx_freq),)
- raise ValueError
# transmitter
+ modulator = self._modulator_class(**mod_kwargs)
self.packet_transmitter = \
- blks.mod_pkts(fg,
- self._modulator_class(fg, **mod_kwargs),
- access_code=None,
- msgq_limit=4,
- pad_for_usrp=True)
-
-
- # Set the USRP for maximum transmit gain
- # (Note that on the RFX cards this is a nop.)
- self.set_gain(self.subdev.gain_range()[1])
+ blks2.mod_pkts(modulator,
+ access_code=None,
+ msgq_limit=4,
+ pad_for_usrp=True)
self.amp = gr.multiply_const_cc(1)
self.set_tx_amplitude(self._tx_amplitude)
- # enable Auto Transmit/Receive switching
- self.set_auto_tr(True)
-
# Display some information about the setup
if self._verbose:
self._print_verbage()
- # Create and setup transmit path flow graph
- fg.connect(self.packet_transmitter, self.amp, self.u)
- gr.hier_block.__init__(self, fg, None, None)
-
- def _setup_usrp_sink(self):
- """
- Creates a USRP sink, determines the settings for best bitrate,
- and attaches to the transmitter's subdevice.
- """
- self.u = usrp.sink_c(fusb_block_size=self._fusb_block_size,
- fusb_nblocks=self._fusb_nblocks)
- dac_rate = self.u.dac_rate();
-
- # derive values of bitrate, samples_per_symbol, and interp from desired info
- (self._bitrate, self._samples_per_symbol, self._interp) = \
- pick_tx_bitrate(self._bitrate, self._modulator_class.bits_per_symbol(),
- self._samples_per_symbol, self._interp, dac_rate)
-
- self.u.set_interp_rate(self._interp)
-
- # determine the daughterboard subdevice we're using
- if self._tx_subdev_spec is None:
- self._tx_subdev_spec = usrp.pick_tx_subdevice(self.u)
- self.u.set_mux(usrp.determine_tx_mux_value(self.u, self._tx_subdev_spec))
- self.subdev = usrp.selected_subdev(self.u, self._tx_subdev_spec)
-
-
- def set_freq(self, target_freq):
- """
- Set the center frequency we're interested in.
-
- @param target_freq: frequency in Hz
- @rypte: 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.
- """
- r = self.u.tune(self.subdev._which, self.subdev, target_freq)
- if r:
- return True
-
- return False
-
- def set_gain(self, gain):
- """
- Sets the analog gain in the USRP
- """
- self.gain = gain
- self.subdev.set_gain(gain)
+ # Connect components in the flowgraph
+ self.connect(self.packet_transmitter, self.amp, self)
def set_tx_amplitude(self, ampl):
"""
- Sets the transmit amplitude sent to the USRP
- @param: ampl 0 <= ampl < 32768. Try 8000
+ Sets the transmit amplitude sent to the USRP in volts
+ @param: ampl 0 <= ampl < 1.
"""
- self._tx_amplitude = max(0.0, min(ampl, 32767.0))
+ self._tx_amplitude = max(0.0, min(ampl, 1))
self.amp.set_k(self._tx_amplitude)
- def set_auto_tr(self, enable):
- """
- Turns on auto transmit/receive of USRP daughterboard (if exits; else ignored)
- """
- return self.subdev.set_auto_tr(enable)
-
def send_pkt(self, payload='', eof=False):
"""
Calls the transmitter method to send a packet
def samples_per_symbol(self):
return self._samples_per_symbol
- def interp(self):
- return self._interp
-
def add_options(normal, expert):
"""
Adds transmitter-specific options to the Options Parser
"""
- add_freq_option(normal)
if not normal.has_option('--bitrate'):
- normal.add_option("-r", "--bitrate", type="eng_float", default=None,
- help="specify bitrate. samples-per-symbol and interp/decim will be derived.")
- normal.add_option("-T", "--tx-subdev-spec", type="subdev", default=None,
- help="select USRP Tx side A or B")
- normal.add_option("", "--tx-amplitude", type="eng_float", default=12000, metavar="AMPL",
- help="set transmitter digital amplitude: 0 <= AMPL < 32768 [default=%default]")
+ normal.add_option("-r", "--bitrate", type="eng_float", default=100e3,
+ help="specify bitrate [default=%default].")
+ normal.add_option("", "--tx-amplitude", type="eng_float", default=0.250, metavar="AMPL",
+ help="set transmitter digital amplitude: 0 <= AMPL < 1 [default=%default]")
normal.add_option("-v", "--verbose", action="store_true", default=False)
- expert.add_option("-S", "--samples-per-symbol", type="int", default=None,
+ expert.add_option("-S", "--samples-per-symbol", type="int", default=2,
help="set samples/symbol [default=%default]")
- expert.add_option("", "--tx-freq", type="eng_float", default=None,
- help="set transmit frequency to FREQ [default=%default]", metavar="FREQ")
- expert.add_option("-i", "--interp", type="intx", default=None,
- help="set fpga interpolation rate to INTERP [default=%default]")
expert.add_option("", "--log", action="store_true", default=False,
help="Log all parts of flow graph to file (CAUTION: lots of data)")
"""
Prints information about the transmit path
"""
- print "Using TX d'board %s" % (self.subdev.side_and_name(),)
print "Tx amplitude %s" % (self._tx_amplitude)
print "modulation: %s" % (self._modulator_class.__name__)
print "bitrate: %sb/s" % (eng_notation.num_to_str(self._bitrate))
print "samples/symbol: %3d" % (self._samples_per_symbol)
- print "interp: %3d" % (self._interp)
- print "Tx Frequency: %s" % (eng_notation.num_to_str(self._tx_freq))
-
-def add_freq_option(parser):
- """
- Hackery that has the -f / --freq option set both tx_freq and rx_freq
- """
- def freq_callback(option, opt_str, value, parser):
- parser.values.rx_freq = value
- parser.values.tx_freq = value
-
- if not parser.has_option('--freq'):
- parser.add_option('-f', '--freq', type="eng_float",
- action="callback", callback=freq_callback,
- help="set Tx and/or Rx frequency to FREQ [default=%default]",
- metavar="FREQ")
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