Usrp2_wfm_rcv.py

Hello,

-I tried to run usrp2_wfm_rcv.py to test my USRP2 with a BasicRX board
and I got the following error:
¨ ZeroDivisionError: float division ¨

My configuration is
-Ubuntu 8.04, with the latest svn (2 weeks old)-USRP2 with a BasicRX.

Please let me know how I can fix the error “/ZeroDivisionError: float
division”/

Thank you,
Catalin

Error details:

[email protected]:/home/gnuradio/test/GNU1/gnuradio-examples/python/usrp2#
./usrp2_wfm_rcv.py -f 94.5M -O surround41
Using RX d’board 0x0001

gr_fir_ccf: using SSE
gr_fir_fff: using SSE
Traceback (most recent call last):
File “./usrp2_wfm_rcv.py”, line 274, in
app = stdgui2.stdapp (wfm_rx_block, “USRP2 WFM RX”)
File “/usr/local/lib/python2.5/site-packages/gnuradio/wxgui/stdgui2.py”,
line 36, in init
wx.App.init (self, redirect=False)
File “/usr/lib/python2.5/site-packages/wx-2.8-gtk2-unicode/wx/_core.py”,
line 7836, in init
self._BootstrapApp()
File “/usr/lib/python2.5/site-packages/wx-2.8-gtk2-unicode/wx/_core.py”,
line 7433, in _BootstrapApp
return core.PyApp__BootstrapApp(*args, **kwargs)
File “/usr/local/lib/python2.5/site-packages/gnuradio/wxgui/stdgui2.py”,
line 39, in OnInit
frame = stdframe (self.top_block_maker, self.title, self._nstatus)
File “/usr/local/lib/python2.5/site-packages/gnuradio/wxgui/stdgui2.py”,
line 60, in init
self.panel = stdpanel (self, self, top_block_maker)
File “/usr/local/lib/python2.5/site-packages/gnuradio/wxgui/stdgui2.py”,
line 81, in init
self.top_block = top_block_maker (frame, self, vbox, sys.argv)
File “./usrp2_wfm_rcv.py”, line 103, in init
self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
File “./usrp2_wfm_rcv.py”, line 186, in _build_gui
callback=self.set_gain)
File “/usr/local/lib/python2.5/site-packages/gnuradio/wxgui/form.py”,
line 225, in init
nsteps = int((self.max-self.min)/self.step_size)
ZeroDivisionError: float division

On Tue, 2008-12-09 at 18:55 -0500, Catalin Lacatus wrote:

Please let me know how I can fix the error “*/ZeroDivisionError: float
division”/*

Which daughterboard are you using? It looks like the code is getting
bad gain range values for it.

-Johnathan

Hi,

For the first time I was using USRP2 with BasicRX.
Also, I did some tests for different frequencies and gains with Basic RX
and RFX2400. I got the same error

“*/ZeroDivisionError: float
division”/*

Thank you,

Catalin

.

On Wed, Dec 10, 2008 at 4:02 PM, Catalin Lacatus
[email protected] wrote:

For the first time I was using USRP2 with BasicRX.
Also, I did some tests for different frequencies and gains with Basic RX and
RFX2400. I got the same error

This appears to be a bug in usrp2_wfm_rx.py, dealing with setting up
the gain slider control in the GUI. I understand why this is
happening with the BasicRX or LFRX, but not yet with the RFX2400.
I’ll look into this further soon.

-Johnathan

Hi,

I just tried running the example on a RFX2400 and it seems to work for
me.

I think the error is caused when the usrp2object.gain_range() command
returns a step size of 0.00000 (like on the BasicRX).

As a quick fix you could try replacing:

    myform['gain'] = \
        form.quantized_slider_field(parent=self.panel, sizer=hbox,

label=“Gain”,
weight=3,
range=self.u.gain_range(),
callback=self.set_gain)

with:

    myform['gain'] = \
        form.quantized_slider_field(parent=self.panel, sizer=hbox,

label=“Gain”,
weight=3,
range=(0.0,70.0,0.03125)
,
callback=self.set_gain)

I couldn’t find a reference to the Flex2400 DB ID after a quick look at
the
USRP2 code which I think means the code will treat the daughterboard as
if
it was a BasicRX.

http://www.ruby-forum.com/topic/177212 suggests you can update the
EEPROM to
convert the board to an RFX2400.

Tim

Hi Tim,

Thanks for pointing me in the right direction.

After some soldering and an eeprom update (
http://gnuradio.org/redmine/wiki/1/USRPClockingNotes), the example now
works
:slight_smile:

Cheers,

Mike

Hi Johnathan,

Have you had any luck with this issue? The same is happening on my
FLEX2400
with USRP2.

Here is the full error message:

./usrp2_wfm_rcv.py -f 2.4G
Using RX d’board 0x0007
This daughterboard does not cover the required frequency range
for this application. Please use a BasicRX or TVRX daughterboard.
Press ENTER to continue anyway, or Ctrl-C to exit.

gr_fir_ccf: using SSE
gr_fir_fff: using SSE
Traceback (most recent call last):
File “./usrp2_wfm_rcv.py”, line 287, in
app = stdgui2.stdapp (wfm_rx_block, “USRP2 WFM RX”)
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py”,
line 36, in init
wx.App.init (self, redirect=False)
File
“/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py”,
line 7935, in init
self._BootstrapApp()
File
“/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py”,
line 7509, in _BootstrapApp
return core.PyApp__BootstrapApp(*args, **kwargs)
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py”,
line 39, in OnInit
frame = stdframe (self.top_block_maker, self.title, self._nstatus)
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py”,
line 60, in init
self.panel = stdpanel (self, self, top_block_maker)
File
“/usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/stdgui2.py”,
line 81, in init
self.top_block = top_block_maker (frame, self, vbox, sys.argv)
File “./usrp2_wfm_rcv.py”, line 116, in init
self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
File “./usrp2_wfm_rcv.py”, line 199, in _build_gui
callback=self.set_gain)
File “/usr/local/lib/python2.6/dist-packages/gnuradio/wxgui/form.py”,
line
225, in init
nsteps = int((self.max-self.min)/self.step_size)
ZeroDivisionError: float division

Cheers,

Mike

On 11 December 2008 17:05, Johnathan C.

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