On Thu, Jan 07, 2010 at 06:19:33PM +0000, nadia raj wrote:
>
> hi,
>
> If i want to send data to side A of usrp and in it TX/RX side whats the
> proper syntax for it.
>
> Regards,
> Nadia
Nadia,
Pretty much every transmitter example implements this...
The standard way to specify which transmit daughterboard is the
-T option, like this:
-T a
Likewise the receive daughterboard can be specified with
-R a
See for example, gnuradio-examples/python/usrp/fm_tx4.py, in
particular this part:
# ----------------------------------------------------------------
# Set up constants and parameters
self.u = usrp.sink_c () # the USRP sink (consumes samples)
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
self.sw_interp = 10
self.audio_rate = self.usrp_rate / self.sw_interp # 32 kS/s
# determine the daughterboard subdevice we're using
if options.tx_subdev_spec is None:
options.tx_subdev_spec = usrp.pick_tx_subdevice(self.u)
m = usrp.determine_tx_mux_value(self.u, options.tx_subdev_spec)
#print "mux = %#04x" % (m,)
self.u.set_mux(m)
self.subdev = usrp.selected_subdev(self.u, options.tx_subdev_spec)
print "Using TX d'board %s" % (self.subdev.side_and_name(),)
self.subdev.set_gain(self.subdev.gain_range()[1]) # set max Tx gain
if not self.set_freq(options.freq):
freq_range = self.subdev.freq_range()
print "Failed to set frequency to %s. Daughterboard supports %s to
%s" % (
eng_notation.num_to_str(options.freq),
eng_notation.num_to_str(freq_range[0]),
eng_notation.num_to_str(freq_range[1]))
raise SystemExit
self.subdev.set_enable(True) # enable
transmitter
Also, to see the entire USRP interface, take a look at:
http://gnuradio.org/doc/doxygen/classusrp__standard__tx.html
http://gnuradio.org/doc/doxygen/classusrp__basic__tx.html
Although they are talking about C++, the mapping to Python is straight forward.
If you haven't already, the USRP FAQ will probably be helpful too:
http://gnuradio.org/redmine/wiki/gnuradio/UsrpFAQ
and/or the PDF version:
http://gnuradio.org/redmine/attachments/129/USRP_Documentation.pdf
Eric
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