[Discuss-gnuradio] USRP2 for my Radio Astronomy stuff

[Marcus D. Leech]

Well, I now have my first user with a USRP2.

So, what are the gotchas that are going to bite me when supporting USRP2
in code that's used to USRP1?

Setup seems a little different--only 1 TX and 1 RX channel, etc.


Here's my new setup_usrp() function:

def setup_usrp(self):
       
        if (self.usrp2 == False):
            if (self.dual_mode == False and self.interferometer == False):
                if (self.decim > 4):
                    self.u =
usrp.source_c(decim_rate=self.decim,fusb_block_size=8192)
                else:
                    self.u =
usrp.source_c(decim_rate=self.decim,fusb_block_size=8192,
fpga_filename="std_4rx_0tx.rbf")
                self.u.set_mux(usrp.determine_rx_mux_value(self.u,
self.rx_subdev_spec))
                # determine the daughterboard subdevice we're using
                self.subdev[0] = usrp.selected_subdev(self.u,
self.rx_subdev_spec)
                self.subdev[1] = self.subdev[0]
                self.cardtype = self.subdev[0].dbid()
            else:
                self.u=usrp.source_c(decim_rate=self.decim,
nchan=2,fusb_block_size=8192)
                self.subdev[0] = usrp.selected_subdev(self.u, (0, 0))
                self.subdev[1] = usrp.selected_subdev(self.u, (1, 0))
                self.cardtype = self.subdev[0].dbid()
                self.u.set_mux(0x32103210)
                c1 = self.subdev[0].name()
                c2 = self.subdev[1].name()
                if (c1 != c2):
                    print "Must have identical cardtypes for --dual_mode
or --interferometer"
                    sys.exit(1)
                #
                # Set 8-bit mode
                #
               
                width = 8
                shift = 8
                format = self.u.make_format(width, shift)
                r = self.u.set_format(format)
        else:
            if (self.dual_mode == True or self.interferometer == True):
                print "Cannot use dual_mode or interferometer with
single USRP2"
                sys.exit(1)
            self.u = usrp2.source_32fc(self.interface, self.mac_addr)
            self.u.set_decim (self.decim)
            self.cardtype = self.u.daughterboard_id()

Also, is there a way to set 8-bit mode on USRP2?   Inquiring minds want
to know.

-- 
Marcus Leech
Principal Investigator, Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org