RE: [Discuss-gnuradio] libusrp C++ examples
-Original Message- From: discuss-gnuradio-bounces+per.zetterberg=ee.kth...@gnu.org [mailto:discuss-gnuradio-bounces+per.zetterberg=ee.kth...@gnu. org] On Behalf Of Radha Krishna Ganti Sent: den 1 april 2009 19:35 To: Discuss-gnuradio@gnu.org Subject: [Discuss-gnuradio] libusrp C++ examples Hi, Are there any examples to use USRP just using the libusrp c++ interface? I don't want to use GNU Radio. My requirements are to initialize the USRP, set a target frequency, set the interpolation rate and to transmit/receive data. I know that we will have to use the libusrp, but am not able to find examples for doing so. Also is it possible to use in-band signaling library similarly? Can someone please provide me some example code as to how to do this or a link to existing examples? -Regards Radha Krishna Ganti -- Radha Krishna Ganti Dept of Elec. Engg. Univ of Notre Dame www.nd.edu/~rganti See: http://gnuradio.org/trac/wiki/UsrpFAQ/CppInterface To work with later releases at least the line : usrp_standard_rx *urx should be changed to usrp_standard_rx_sptr urx (there may also be other changes required). To control the daughterboards use the tune method of usrp_standard_rx. BR/ Per ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Difference in gain using gnuradio 3.1.3 and the trunk (at least on RFX1800)
Dear All, I have connected a signal generator to my USRP and I am using a CW. Thus I have a constant input power. I am running the usrp_rx_cfile.py utility (exact command line below). If I run gnuradio 3.1.3 then the amplitude I see is 16dB higher than if compile from the trunk (checked out a week ago or so). I think it has to do with the new daughterboard code being different from the old python one. I am using an RFX1800 daughterboard. The signals are also conjugated with respect to each other BR/ Per sudo ./usrp_rx_cfile.py -d 8 -f 1902.5e6 -R A -s -g 50 -N 5000 test.dat ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] gr-howto-write-a-block
On Thu, Apr 02, 2009 at 04:55:39AM +0200, William Sherman wrote: However when I run a test program with: from gnuradio import howto There's several places where this can go wrong, but my guess is you're trying to run the line above in one of your qa_* files through make check - right? If so, change the line to 'import howto', as in the examples. the run_tests script will change all the path stuff for you. Once make check passes, see what 'make install' tells you; all make processes are pretty verbose. It might be putting your module in the wrong position. To see if that worked, you have to use your 'from gnuradio ...' line above. Hope this is what you were looking for... MB -- Dipl.-Ing. Martin Braun Phone: +49-(0)721-608 3790 Institut fuer Nachrichtentechnik Fax: +49-(0)721-608 6071 Universitaet Karlsruhe (TH) http://www.int.uni-karlsruhe.de/ pgppB0Snq7q7A.pgp Description: PGP signature ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] LW/AM/SW radio very cheap in laptop?
There's another chance to get kids into radio... If a high volume kids' laptop had stereo HD audio ports available (24-bit 192 kHz converters, 95 db input and 100 db output), how cheap and small a circuit could you build onto that motherboard to provide useful LW/AM radio reception? Could you use the left output channel to tune, the right output channel to control the gain, and feed the resulting filtered signal to a pair of input channels? John ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] LW/AM/SW radio very cheap in laptop?
Hi, --- On Thu, 4/2/09, John Gilmore g...@toad.com wrote: There's another chance to get kids into radio... If a high volume kids' laptop had stereo HD audio ports available (24-bit 192 kHz converters, 95 db input and 100 db output), how cheap and small a circuit could you build onto that motherboard to provide useful LW/AM radio reception? John Here is my 2 cents: 1) AM signals known to be strong, RF Gain may not be required. 2) Undersampling can be used to downconvert/digitize AM signals. 3) RF Tunning is the problem. We have to think for away to use the voltage from one of the audio output ports to control a bandpass filter center frequency (voltage controlled filter). 4) Software demodulation. Best Regards, Firas ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] some posts are missing in gmane.org
Hi All, i only want to let you know, that some of the mails i posted here are not shown in gmane.org, but in my newsreader thunderbird(debian). Maybe there is a problem ? Regards Markus ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Question about latency
Hi, Hello everyone, I am trying to implement some relaying schemes in gnuradio which require fast response from the relay. I only know how to use flow graphs at the moment so I made my code with flowgraphs and the delay from receiving a packet until I retransmit it is about 10ms. I'm using USRP1 and the sampling rate is 2MSPS and I use the autotransmit capability of USRP. First of all I'm trying to understand where the delay comes from. I'm sure the delay is not due to processing time of the packet because the processing is very simple. I don't know about latencies in the kernel though. I read in a paper that the time it takes for data to go from user space to kernel is only 200us. Secondly I would like to know if using mblocks has any chance of reducing this delay. By the way is there any documentation for the mblocks? Thanks Manolis 1) The following page may be useful: http://gnuradio.org/trac/wiki/UsrpFAQ/Latency 2) Did you tried to increase sampling rate up to 4MHz ? 3) How did you measured the delay ? Best Regards, Firas -- View this message in context: http://www.nabble.com/Question-about-latency-tp22824860p22844566.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Please help building a signal processing block.
Thank you all for help/suggestions.
I think I was most successful in implementing it the way Karthik described
it. My code below:
const float *in = (const float *) input_items[0];
float *out = (float *) output_items[0];
for (int i = 0; i d_vlen; i++){
temp = in[i] * (i+1);
d_buffer.push_back(temp);
}
for(int j = 0; j d_vlen; j++) {avg += d_buffer[j]; }
out[0] = avg / d_vlen;
d_buffer.clear();
It seems to work with built-in how to...block test script. I've tried
putting in a size 512 vector and received an output vector of length 1.
Regards,
Mikhail
P.S. I've attached my code if somebody wants a look.
On Mon, Mar 30, 2009 at 11:56 PM, Eric Blossom e...@comsec.com wrote:
On Mon, Mar 30, 2009 at 09:17:18AM +0200, Martin Braun wrote:
On Sat, Mar 28, 2009 at 05:35:59PM -0700, Mikhail Tadjikov wrote:
Thanks, but I'm trying to get weighted average specifically. I've
looked at the
code for moving_average... it's close to what I need, but its 1:1
in/out ratio,
but I need N:1 ratio. That's the part I'm particular unclear about.
Since you're turning 1 vector into 1 output value, you could also use a
gr_sync_block and prepend it with a gr_stream_to_vector. That
automatically takes care of aligning etc.; if you use a sync_decimator
you're not guaranteed to get N samples every time.
Actually, with a sync decimator, you'll get a multiple of N input samples
every time.
Eric
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--
Mikhail Tadjikov
Graduate Student
UCLA Department of
Electrical Engineering
cores_weighted_avg_ff.cc
Description: Binary data
cores_weighted_avg_ff.h
Description: Binary data
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Re: [Discuss-gnuradio] Re: Using one USRP
On Apr 1, 2009, at 11:26 PM, William Sherman wrote: Michael Dickens wrote: Hi Ali - Check out the following MS thesis, by a ex-colleague of mine here at ND: Practical Implementation of a Cognitive Radio System for Dynamic Spectrum Access http://etd.nd.edu/ETD-db/theses/available/etd-07252008-162749/ did the person who wrote this thesis write and develop transmit/receive_path, with this later being incorporated into gnuradio, or the other way around? Other way around; she just used what was available from GNU Radio at the time and modified it to meet her needs. - MLD ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] some posts are missing in gmane.org
On Thu, Apr 02, 2009 at 09:47:33AM +, feldmaus wrote: Hi All, i only want to let you know, that some of the mails i posted here are not shown in gmane.org, but in my newsreader thunderbird(debian). Maybe there is a problem ? Regards Markus No clue. We don't have anything to do with gmane.org. They're just a regular subscriber. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] benchmark_rx.py in Digital-bert
Hi, dear all, I was trying to using the benchmark_rx.py in the digital-bert file to receive a BPSK modulated signal from another USRP using benchmark_tx.py, the problem is that even I did not run the benchmark_tx.py, I am still receiving sth with benchmark_rx.py, could anyone explain this to me? or do I have to modify some codes in benchmark_rx.py? I'm using center frequency of 900 M. Thanks a lot! -- Best wishes, Yufeng ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] benchmark_rx.py in Digital-bert
On Thu, Apr 02, 2009 at 10:09:19AM -0400, yufeng wang wrote: Hi, dear all, I was trying to using the benchmark_rx.py in the digital-bert file to receive a BPSK modulated signal from another USRP using benchmark_tx.py, the problem is that even I did not run the benchmark_tx.py, I am still receiving sth with benchmark_rx.py, could anyone explain this to me? or do I have to modify some codes in benchmark_rx.py? I'm using center frequency of 900 M. Thanks a lot! -- Best wishes, Yufeng You're not giving us much to work with. Please read http://gnuradio.org/trac/wiki/ReportingErrors and try again. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Access to history before there is one (Block writing question)
Sorry, no. Eric OK, Is there a way to distinguish between an uninitialized history (which seems to be all 0's) and a history whose data is all 0's? Or perhaps some way that the work function knows this that it is the first time being called (I am currently kludging it with a class variable, 'cleared_buffer') Thanks Jason ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Access to history before there is one (Block writing question)
On Thu, Apr 02, 2009 at 09:30:47AM -0500, Jason Uher wrote: Sorry, no. Eric OK, Is there a way to distinguish between an uninitialized history (which seems to be all 0's) and a history whose data is all 0's? No. 0 == 0 :-) Or perhaps some way that the work function knows this that it is the first time being called (I am currently kludging it with a class variable, 'cleared_buffer') The instance variable should do it. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
RE: [Discuss-gnuradio] Question about latency
Hi, On Thu, 4/2/09, Matigakis Emmanouil mmatiga...@isc.tuc.gr wrote: Hello, I did tried to increase the sampling rate and the delay went up to 100ms. I was getting a lot of Uo on the screen though from the program. The block I've made that does the processing stores the waveform it receives in a file so I can look at it from Matlab. I think what I'm trying to do is very difficult if at all possible with flowgraphs. So I will try to use in-band signaling code. Is there something similar to gr-howto-write-a-block for using mbloks? Thanks Manolis If you are trying to do just an RF repeater (digitally connecting TX IF and RX IF ), I don't think the time is much as 100msec with 4MHz. There is something wrong. I suggest to you to use BasicRX and Basic TX in the first. If you want to measure the delay from end to end , I suggest the following idea (I didn't implement and tried it, it just came on my mind while reading your email): Connect the output of Basic TX to the input of basic RX through 20 dB attenuator. Start grc, connect a saw tooth signal generator to usrp sink. Connect usrp source to oscilloscope graphical sink (channel A). For the same scope sink, connect the saw tooth source to its other channel (channel B). You should now see two saw tooth signals one that send to TX and the other is the received RX. Vary saw tooth frequency and measure the delay between the start of these two signals. This will be the end to end latency. Of course it will depend you your PC speed and its OS. Let me know if it works for you. Best Regards, Firas ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Question about latency
Hello everyone, I am trying to implement some relaying schemes in gnuradio which require fast response from the relay. I only know how to use flow graphs at the moment so I made my code with flowgraphs and the delay from receiving a packet until I retransmit it is about 10ms. I'm using USRP1 and the sampling rate is 2MSPS and I use the autotransmit capability of USRP. First of all I'm trying to understand where the delay comes from. Hi, I'm not entirely sure, but I think there is a sleep in the (FlexRF) daughter- board drivers... Try grepping usleep. BR. //Mattias ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] BBN 802.11b RSSI output
Hi, I'm successfully running the demo scripts supplied with the BBN 802.11b code on USRP1, with typical output: PKT: len=59, rssi=-21, src=00:1f:3c:a5:EF:52, time=1277411936, rate=1 Mbps PKT: len=42, rssi=-21, src=00:1f:3c:a5:EF:52, time=1277413056, rate=1 Mbps PKT: len=59, rssi=-24, src=00:1f:3c:a5:EF:52, time=1280761840, rate=1 Mbps I found an earlier (8/3/06) post in the discussion list from a BBN developer stating : Note that our GNU Radio IEEE 802.11 receive code currently reports signal strength in dB with respect to an arbitrary baseline. We haven't yet calibrated this to dBm. Does anyone know if this calibration to dBm was ever implemented? What units are the RSSI output? Thanks. Dan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Software Communication Architecture (SCA) and GNU Radio
Hi, Basically, SCA and GNU Radio are two different methods to implement SDR. However, SCA has CORBA as software bus to add different applications. I am thinking if I can treat GNU Radio as non-CORBA modem applications and plug GNU Radio into the SCA core framework through a adapter. I think that I need some guides at this moment to figure out if this direction is possible. If anyone has comments, please tell me!! Thank you so much for your time and help!!! Sheng ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] NotImplementedError: Wrong number of arguments for overloade
On Tue, Mar 31, 2009 at 5:23 AM, Jay Kumar li...@ruby-forum.com wrote: I have installed gnuradio-3.1.3 on RHEL4 with i686 architecture.I have loaded the firmware in the usrp.But whenever i try to run ./usrp_oscope.py i get the following error: We have discovered a bug in usrp_oscope.py, but it may be unrelated to what you are reporting. Once that is fixed, would you be able to use the GNU Radio trunk software via Subversion to test if your problem still exists? Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Swig Error
Hi, I am getting the following error while running a programme. Programme is fine. I have checked it on other PC. I think there is some thing wrong with the installation of SWIG or else. Traceback (most recent call last): File ./gsm_scan.py, line 21, in module from gnuradio import usrp File /usr/local/lib/python2.5/site-packages/gnuradio/usrp/__init__.py, line 25, in module from usrp_swig import * File /usr/local/lib/python2.5/site-packages/gnuradio/usrp/usrp_swig.py, line 6, in module import _usrp_swig ImportError: /usr/local/lib/libgnuradio-usrp.so.0: undefined symbol: _ZN7db_base4dbidEv # Line 6 is: import _usrp_swig line 25 is: from usrp_swig import * I am on Ubuntu 8.10 GNU Radio 3.1.3 Best Regards, Gohar ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Difference in gain using gnuradio 3.1.3 and the trunk (at least on RFX1800)
On Wed, Apr 1, 2009 at 11:45 PM, Per Zetterberg per.zetterb...@ee.kth.se wrote: I have connected a signal generator to my USRP and I am using a CW. Thus I have a constant input power. I am running the usrp_rx_cfile.py utility (exact command line below). If I run gnuradio 3.1.3 then the amplitude I see is 16dB higher than if compile from the trunk (checked out a week ago or so). I think it has to do with the new daughterboard code being different from the old python one. I am using an RFX1800 daughterboard. In other words, the magnitude of the samples in the captured .dat files are different by a factor of 16dB? Do they otherwise look the same spectrally? The signals are also conjugated with respect to each other Conjugated, as in a+bi = a-bi , or as in a+bi = b+ai? Johnathan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Swig Error
On Thu, Apr 02, 2009 at 11:02:23AM -0700, gohar anwar wrote: Hi, I am getting the following error while running a programme. Programme is fine. I have checked it on other PC. I think there is some thing wrong with the installation of SWIG or else. Traceback (most recent call last): File ./gsm_scan.py, line 21, in module from gnuradio import usrp File /usr/local/lib/python2.5/site-packages/gnuradio/usrp/__init__.py, line 25, in module from usrp_swig import * File /usr/local/lib/python2.5/site-packages/gnuradio/usrp/usrp_swig.py, line 6, in module import _usrp_swig ImportError: /usr/local/lib/libgnuradio-usrp.so.0: undefined symbol: _ZN7db_base4dbidEv # Line 6 is: import _usrp_swig line 25 is: from usrp_swig import * I am on Ubuntu 8.10 GNU Radio 3.1.3 Best Regards, Gohar $ c++filt _ZN7db_base4dbidEv db_base::dbid() Given the missing symbol, it appears that at least part of your installation is from a relatively recent copy of the trunk, since db_base is part of the C++ daughterboard code. I suggest that you remove all traces of GNU Radio from /usr/local, then remake and install a known version (from svn or a tarball). Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] transmitting from file stored by usrp_rx_cfile.py
I am trying to transmit from a file stored using usrp_rx_cfile.py (or
usrp_rx_cfile created using usrp_rx_cfile.cc/h). I have been able to
successfully do this using a usrp_tx_cfile.cc/h program derived from the rx
version. I can't, however, get similar functionality using python. I am
new to python, so I am hoping I have just missed some key insight. I have
listed below the source for my cc and py versions of usrp_tx_cfile and the
associated command line output from the transmit side. I am running on Mac
OS X with gnuradio code pulled down on Feb 13, 2009. My daughterboards are
RFX2400 and I am receiving on two other machines with the same USRP set up,
but different hardware and OS (Linux). I am using usrp_fft and usrp_oscope
on the receiving side. To test functionality, I stored data on the Mac
using usrp_rx_cfile while running usrp_siggen -f 25 on one of the
other machines.
Also, I noticed that when I use the subdev-gain_min() and
subdev-gain_max() functions, both return 0 instead of correct values.
C++ code is shown below first, followed by the non-working python code. Any
help is much appreciated!
-Jaze
So, when I compile and run this code, I see the waveform on the receiver:
/*
* usrp_tx_cfile.cc - code based on usrp_rx_cfile.cc
*/
#include usrp_tx_cfile.h
#include gr_io_signature.h
#include gr_head.h
#include stdexcept
#include iostream
#include boost/program_options.hpp
namespace po = boost::program_options;
usrp_subdev_spec
str_to_subdev(std::string spec_str)
{
usrp_subdev_spec spec;
if(spec_str == A || spec_str == A:0 || spec_str == 0:0) {
spec.side = 0;
spec.subdev = 0;
}
else if(spec_str == A:1 || spec_str == 0:1) {
spec.side = 0;
spec.subdev = 1;
}
else if(spec_str == B || spec_str == B:0 || spec_str == 1:0) {
spec.side = 1;
spec.subdev = 0;
}
else if(spec_str == B:1 || spec_str == 1:1) {
spec.side = 1;
spec.subdev = 1;
}
else {
throw std::range_error(Incorrect subdevice specifications.\n);
}
return spec;
}
// Shared pointer constructor
usrp_tx_cfile_sptr make_usrp_tx_cfile(int which, usrp_subdev_spec spec,
int interp, double freq, float gain,
bool width8, bool nohb,
bool output_shorts, int nsamples,
const std::string filename)
{
return gnuradio::get_initial_sptr(new usrp_tx_cfile(which, spec,
interp, freq, gain,
width8, nohb,
output_shorts,
nsamples,
filename));
}
// Hierarchical block constructor, with no inputs or outputs
usrp_tx_cfile::usrp_tx_cfile(int which, usrp_subdev_spec spec,
int interp, double freq, float gain,
bool width8, bool nohb,
bool output_shorts, int nsamples,
const std::string filename) :
gr_top_block(usrp_tx_cfile),
d_which(which), d_spec(spec), d_interp(interp), d_freq(freq),
d_gain(gain), d_width8(width8), d_nohb(nohb), d_nsamples(nsamples),
d_filename(filename)
{
usrp_sink_c_sptr usrp = usrp_make_sink_c(d_which, d_interp);
// standard fpga firmware std_2rxhb_2tx.rbf contains
// 2 Rx paths with halfband filters and 2 tx paths
//(the default) min decimation 8
//usrp = usrp_make_source_c(d_which, d_decim);
/* Get subdevice and process it */
db_base_sptr subdev = usrp-selected_subdev(d_spec);
printf(\nSubdevice name is %s\n, subdev-side_and_name().c_str());
printf(Subdevice freq range: (%g, %g)\n,
subdev-freq_min(), subdev-freq_max());
unsigned int mux = usrp-determine_tx_mux_value(d_spec);
printf(mux: %#08x\n, mux);
usrp-set_mux(mux);
float gain_min = subdev-gain_min();
float gain_max = subdev-gain_max();
printf (gain min is %g. gain max is %g.\n, gain_min, gain_max);
if(d_gain == -1) {
//d_gain = (gain_min + gain_max)/2.0;
printf(No gain specified. Setting to max gain.\n);
d_gain = gain_max;
d_gain = 90;
}
printf(gain: %g\n, d_gain);
subdev-set_gain(d_gain);
float input_rate = usrp-dac_freq() / usrp-interp_rate();
printf(baseband rate: %g\n, input_rate);
/* Set the USRP/dboard frequency */
usrp_tune_result r;
//bool ok = usrp-tune(0, subdev, freq, r); //DDC 0
bool ok = usrp-tune(subdev-which(), subdev, d_freq, r);
if(!ok) {
throw std::runtime_error(Could not set frequency.);
}
subdev-set_enable(true);
/* The rest */
d_src = gr_make_file_source(sizeof(gr_complex), d_filename.c_str());
//if(d_nsamples == -1) {
connect(d_src, 0, usrp, 0);
//}
//else {
// d_head = gr_make_head(sizeof(gr_complex), d_nsamples*2);
// connect(usrp, 0, d_head, 0);
// connect(d_head, 0, d_dst, 0);
//}
}
int main(int argc, char *argv[])
{
int which = 0; // specify which USRP board
usrp_subdev_spec spec(0,0); // specify the d'board side
int
Re: [Discuss-gnuradio] transmitting from file stored by usrp_rx_cfile.py
On Thu, Apr 02, 2009 at 03:59:22PM -0400, Jaze Dalton wrote:
I am trying to transmit from a file stored using usrp_rx_cfile.py (or
usrp_rx_cfile created using usrp_rx_cfile.cc/h). I have been able to
successfully do this using a usrp_tx_cfile.cc/h program derived from the rx
version. I can't, however, get similar functionality using python. I am
new to python, so I am hoping I have just missed some key insight. I have
listed below the source for my cc and py versions of usrp_tx_cfile and the
associated command line output from the transmit side. I am running on Mac
OS X with gnuradio code pulled down on Feb 13, 2009. My daughterboards are
RFX2400 and I am receiving on two other machines with the same USRP set up,
but different hardware and OS (Linux). I am using usrp_fft and usrp_oscope
on the receiving side. To test functionality, I stored data on the Mac
using usrp_rx_cfile while running usrp_siggen -f 25 on one of the
other machines.
Also, I noticed that when I use the subdev-gain_min() and
subdev-gain_max() functions, both return 0 instead of correct values.
Those are the right values. min == max - not adjustable
C++ code is shown below first, followed by the non-working python code. Any
help is much appreciated!
-Jaze
Here is the python version, which doesn't seem to transmit anything:
#!/usr/bin/env python
Read samples a file and transmit using USRP
from gnuradio import gr, eng_notation
from gnuradio import audio
from gnuradio import usrp
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import sys
class my_top_block(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
usage=%prog: [options] output_filename
parser = OptionParser(option_class=eng_option, usage=usage)
parser.add_option(-R, --tx-subdev-spec, type=subdev,
default=(0, 0),
help=select USRP tx side A or B (default=A))
parser.add_option(-i, --interp, type=int, default=128,
help=set fgpa decimation rate to INTERP
[default=%default])
parser.add_option(-f, --freq, type=eng_float, default=None,
help=set frequency to FREQ, metavar=FREQ)
parser.add_option(-g, --gain, type=eng_float, default=None,
help=set gain in dB (default is midpoint))
(options, args) = parser.parse_args ()
if len(args) != 1:
parser.print_help()
raise SystemExit, 1
filename = args[0]
if options.freq is None:
parser.print_help()
sys.stderr.write('You must specify the frequency with -f
FREQ\n');
raise SystemExit, 1
# build the graph
self.u = usrp.sink_c(interp_rate=options.interp)
Try:
self.u = usrp.sink_c(0, interp_rate=options.interp)
Eric
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[Discuss-gnuradio] Re: gr-howto-write-a-block
I did not run make install before. When I ran make install I get the following messages: curve: [~/Masters/ren_static/gr-howto-ren-3.1.3] % make install Making install in config Making install in src Making install in lib make install-am test -z /u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/include/gnuradio || ../.././install-sh -c -d /u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/include/gnuradio /usr/bin/install -c -m 644 'howto_square_ff.h' '/u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/include/gnuradio/howto_square_ff.h' /usr/bin/install -c -m 644 'howto_square2_ff.h' '/u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/include/gnuradio/howto_square2_ff.h' /usr/bin/install -c -m 644 'howto_ren_bin_statistics_mean_f.h' '/u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/include/gnuradio/howto_ren_bin_statistics_mean_f.h' test -z /u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/lib/python2.5/site-packages/gnuradio || ../.././install-sh -c -d /u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/lib/python2.5/site-packages/gnuradio /bin/bash ../../libtool --mode=install /usr/bin/install -c '_howto.la' '/u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/lib/python2.5/site-packages/gnuradio/_howto.la' libtool: install: /usr/bin/install -c .libs/_howto.so /u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/lib/python2.5/site-packages/gnuradio/_howto.so libtool: install: /usr/bin/install -c .libs/_howto.lai /u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/lib/python2.5/site-packages/gnuradio/_howto.la libtool: install: warning: remember to run `libtool --finish /u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3' make: don't know how to make howto_square_ff.py. Stop make: stopped in /am/state-opera/home1/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/src/lib *** Error code 2 make install begins to fail here, /u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3/lib/python2.5/site-packages/gnuradio/_howto.la libtool: install: warning: remember to run `libtool --finish /u/students/renyu/Masters/ren_static/gr-howto-write-a-block-3.1.3' make: don't know how to make howto_square_ff.py. Stop I did not modify howto_square_ff so I am unsure why it is complaining that it can't make howto_square_ff. This warning, install: warning: remember to run `libtool --finish is interesting. Googling this it appears to be related with where make tries to locate libraries / directory it makes the library to? Does anyone know why the make install fails and I can't make a new block? Martin Braun wrote: On Thu, Apr 02, 2009 at 04:55:39AM +0200, William Sherman wrote: However when I run a test program with: from gnuradio import howto There's several places where this can go wrong, but my guess is you're trying to run the line above in one of your qa_* files through make check - right? If so, change the line to 'import howto', as in the examples. the run_tests script will change all the path stuff for you. Once make check passes, see what 'make install' tells you; all make processes are pretty verbose. It might be putting your module in the wrong position. To see if that worked, you have to use your 'from gnuradio ...' line above. Hope this is what you were looking for... MB -- Posted via http://www.ruby-forum.com/. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] [Douglas Geiger BBN 802.11b] Porting code on USRP2 problems
Hi all, I'm trying to port the tx code to the usrp2 based on Colby's branch and i'm having some problems. The program freezes when the 3rd packet is being sent. The program uses a gr.message_source to buffer the packets and convert them into a data flow to the modulator, and the problem is that, for some reason, the data flow isn't flowing and the packets are accumulating in the msg_source. Since the msg_source's queue size is 2, the method to add the 3rd packet to the queue blocks because the queue is full. I didn't figured out whats the problem with my code. The bbn80211b_test.py woks, so the problem is probably related to the connection of the modulator block with the usrp2 sink or to the configuration of the usrp2. I'm sending the files i have modified. 2009/3/31 Colby Boyer csbo...@berkeley.edu Hi all, I created a branch on the cgran server for the usrp2 code. If anyone is interested in still using the usrp with the hier_block2, just dont use the rx/tx.py files. The rest of the files should work with the usrp1. Cheers, Colby On Mon, Mar 30, 2009 at 3:58 PM, George Nychis gnyc...@cmu.edu wrote: Hi all, CGRAN's trac has a core dumping issue that I still have not figured out how to address yet. So, if you're using the wiki and get blank pages or a 500 internal server error, sorry. I've been trying to sort it out, but no luck yet: http://www.gossamer-threads.com/lists/trac/users/40954 It should not affect the svn server though. - George 2009/3/30 Colby Boyer csbo...@berkeley.edu The cgran server seems to be down. I'll let you know when I am able to get an account. On Mon, Mar 30, 2009 at 8:36 AM, Colby Boyer colby.bo...@gmail.comwrote: Sure. I will try to get a cgran account and upload my code to their SVN. It would then be easy to see the changes I made. On Mon, Mar 30, 2009 at 2:21 AM, Costantini, Andrea costant...@ftw.atwrote: Hi Colby, I am glad that I am not the only one trying to port the code. I guess you are in a more advanced state. I wasn't even able to run the test.py. ;-) Would you like to share your modified code (even if it is not finished)? so that I try to understand your modifications. Best Regards, Andrea P.S. For the USRP2 api, I usually compare the USRP2 and USRP swig code (e.g. usrp2.py and usrp_swig.py). Colby Boyer wrote: Hi Andrea, I am also working to port the 802.11b code to the USRP2. I have finished converting the code to hier_block2, and the bbn_80211b_test.py script works correctly and it can send packets in simulation. I am currently working on modifying the rx, and tx files to connect to the USRP2, but been struggling to make progress. I have not had much luck finding any documentation for the USRP2 function calls, so I am sorta lost on what to change in rx, tx and tx transmit path files. Does anyone have any links to the usrp2 api? I would be more than happy to share the modifications I made (built largly upon Douglas's work) with rest of the GNU radio community. Regards, Colby Boyer ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio # # Copyright 2005 Free Software Foundation, Inc. # # Copyright (c) 2006 BBN Technologies Corp. All rights reserved. # Effort sponsored in part by the Defense Advanced Research Projects # Agency (DARPA) and the Department of the Interior National Business # Center under agreement number NBCHC050166. # # This file is part of GNU Radio # # GNU Radio is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # # GNU Radio is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with GNU Radio; see the file COPYING. If not, write to # the Free Software Foundation, Inc., 59 Temple Place - Suite 330, # Boston, MA 02111-1307, USA. # from gnuradio import gr, gru, blks2 from gnuradio import usrp2 from bbn_80211b_pkt import * # / # transmit path # / class bbn_80211b_transmit_path(gr.hier_block2): def __init__(self, interp, spb, use_barker, interface=, mac_addr=None): gr.hier_block2.__init__(self, bbn_80211b_transmit_path, gr.io_signature(0,0,0), gr.io_signature(0,0,0)) self.normal_gain
[Discuss-gnuradio] Are these Ramsey modules compatible with the USRP?
I am considering purchasing the following items from Ramsey Electronics for use with the USRP and would like some feedback regarding whether they are compatible. I figure there are probably folks here that have either used these items or have at least considered them at some point. The first item is a pre-amplifier: http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=actionkey=PR-S ERIES My main concern is I don't want to blow out the front end of the USRP. The other item is a power amplifier: http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=actionkey=LPA1 Presently I am planning on using the VERT400 antenna that was purchased along with the USRP. Does anyone know how much power I can dump into it safely? I would like to use a better antenna subject to needing to stay omnidirectional and being limited to a length of less than 18. Any suggestions? I'm assuming that I can use the TX/RX output of the Flex400 to drive the RF amp and one antenna and use a second antenna feeding the pre-amp and then the RX input of the same Flex400 board. Does this sound reasonable, or am I overlooking something? I am cleared to transmit with up to 100W of power centered at 447MHz with up to 20MHz of signal bandwidth. While I would love to at least get up to 10W, it looks like my beer budget is more along the lines of 1W. Does anyone know how to get into the 5W or higher range for under $250 each? I need a pretty lightweight DC-powered amplifier as this will be mounted in an RC airplane. TIA smime.p7s Description: S/MIME cryptographic signature ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Sanity check - BPSK/FSK and IQ sample stream
I'm finally getting back to working with the USRP and would like a sanity check on if I am thinking about something correctly. Let's say that I want to generate a BPSK signal at a data rate of, say, 1000 bits per second. Is all I have to do is generate an antipodal (+/-V where V is some constant amplitude) baseband signal at 1000 bps and send that as the I data (or the Q) and leave the other one all zeros? Does that result in a BPSK waveform at the carrier frequency? If not, what does it result in? If I wanted to do 4PSK, would I just use +/-V on the I and +/-V on the Q as my four data values thus doubling my data rate for the same sampling rate. In theory, if I can support 4MSa/s (I/Q samples) across the USB link then I could get 8Mb/s transmitted. Does this sound right (ignoring issues associated with receiving and demodulating it)? What about if I want to do FSK? For example, let's say that I want to use the frequencies 450MHz +/- 1MHz (so 449MHz and 451MHz). Is there a way to tune the USRP to a center frequency of 450MHz and send it a corresponding IQ sample stream? If so, what would that sample stream need to look like? They way I am presently visualizing it, I would need to tune the USRP to, say, 448MHz and then generate 1MHz and 2MHz waveforms placed on the I (or Q) leaving the other zero. I suppose I could tune to 449MHz and use a DC value and a 1 MHz waveform, but that seems like it would result in a pretty good degree of asymmetry if there weren't very many samples in the bit period. I'm also concerned about asymmetry in the other case, as well, although it seems like it would be better. TIA - Bill smime.p7s Description: S/MIME cryptographic signature ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Software Communication Architecture (SCA) and GNU Radio
Sheng, are you familiar with OSSIE project (http://ossie.mprg.org) ? It's an open source SCA implementation and they use USRP as their RF front end. Perhaps that could be a better place to start. However, I'm not sure what is your ultimate goal. Jakub 2009/4/2 sheng sheng...@yahoo.com: Hi, Basically, SCA and GNU Radio are two different methods to implement SDR. However, SCA has CORBA as software bus to add different applications. I am thinking if I can treat GNU Radio as non-CORBA modem applications and plug GNU Radio into the SCA core framework through a adapter. I think that I need some guides at this moment to figure out if this direction is possible. If anyone has comments, please tell me!! Thank you so much for your time and help!!! Sheng ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Re: usrp1 harmonic issue
Markus Feldmann schrieb: Eric Blossom schrieb: On Wed, Apr 01, 2009 at 07:32:04AM +, feldmaus wrote: Eric Blossom eb at comsec.com writes: To disable automatic ADC control on all ADC's: u.set_dc_offset_cl_enable(0x0, 0xf) Then set the offset that you want for each ADC using: u.set_adc_offset(0, offset0) u.set_adc_offset(1, offset1) u.set_adc_offset(2, offset2) u.set_adc_offset(3, offset3) And if i only want to diable the automatic dc offset loop at ADC_0 and ADC_1, then: u.set_dc_offset_cl_enable(0x3, 0x3) Is this correct ??? No, you'd want u.set_dc_offet_cl_enable(0x0, 0x3) The mask specifies which of the bits will be touched. value is the value you want for those bits. Hi and thanks for your answer, but then i didn't understand what you try with, u.set_adc_offset(0, offset0) u.set_adc_offset(1, offset1) u.set_adc_offset(2, offset2) u.set_adc_offset(3, offset3) As you wrote above, the mask is the bits you want to touch and the bits is the value you want to store, but why do you want to store a value of int(2) and int(3). As i understand you, there are only 2 logically values for the bits we store int(0) and int(1). Is this correct ? My mistake i mixed up the both methods. :-) Regards Markus ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
RE: [Discuss-gnuradio] uspr2 working intermittently/segmentation fault
It seems to run a lot better now after I reinstalled the latest firmware on the SD Card. Thank you. Thanh -Original Message- From: Eric Blossom [mailto:e...@comsec.com] Sent: Wednesday, April 01, 2009 3:15 PM To: Pham, Thanh Cc: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] uspr2 working intermittently/segmentation fault On Wed, Apr 01, 2009 at 03:00:57PM -0600, Pham, Thanh wrote: Hello, I am running gnuradio on a Linux x86_64 box, fedora10. I downloaded the code from the development trunk on 2/26/09. Lately I notice that my uspr2 has been working intermittently. Sometimes, even running the example code would give me a segmentation fault error or errors like the one listed below. If I turn the uspr2 off and back on then rerun the program, the program will run again okay. Has someone seen this behavior before or had any explanation for why it behaves that way. Also, is there a command to reboot/reset the uspr2 instead of turning the power off and on? Thanks! It appears that you do not have the current firmware (and possibly FPGA image) installed on the SD Card. Please grab the latest from: http://gnuradio.org/releases/usrp2-bin/trunk/ Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] timestamp counter-extra ticks in 1st frame
I am using the two lines in the rx_nop_handler.h to print out the timestamp. printf(W0: %08x TS: %08x\n, metadata-word0, metadata-timestamp); printf(I0: %08x\n, items[0]); Looking at the timestamp that was printed out from usrp2_fft.py, I notice that there is always a few extra ticks in the first frame. I'm trying to understand why. Does someone have an explanation? Thanks! TS (hex)TS(decimal) # of ticks in frame (decim_rate=16) 507c5e551350327893 507c75941350333844 5951(1st frame has 15 extra ticks, this number changes with decimation rate but not consistent) 507c8cc41350339780 5936 507ca3f41350345716 5936 507cbb241350351652 5936 507cd2541350357588 5936 507ce9841350363524 5936 507d00b41350369460 5936 507d17e41350375396 5936 507d2f141350381332 5936 507d46441350387268 5936 507d5d741350393204 5936 507d74a41350399140 5936 507d8bd41350405076 5936 507da3041350411012 5936 507dba341350416948 5936 507dd1641350422884 5936 507de8941350428820 5936 507dffc41350434756 5936 507e16f41350440692 5936 507e2e241350446628 5936 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] hier block inside a hier block
Hello all, I am not sure whether this is strange behaviour or I am misunderstanding what you can do with hier_blocks. Problem is best described with an example: from gnuradio import gr class h_block(gr.hier_block2): def __init__(self): gr.hier_block2.__init__(self, h_block, gr.io_signature(1,1,gr.sizeof_float), gr.io_signature(0,0,0)) hblock2 = h_block2() self.connect(self, hblock2) class h_block2(gr.hier_block2): def __init__(self): gr.hier_block2.__init__(self, h_block2, gr.io_signature(1,1,gr.sizeof_float), gr.io_signature(0,0,0)) self.connect(self, gr.multiply_const_ff(1), gr.null_sink(4)) class temp(gr.top_block): def __init__(self): gr.top_block.__init__(self) source = gr.null_source(4) hblock = h_block() self.connect(source, hblock) self.start() if __name__ == __main__: app = temp() When I run the above example I get: sd...@sdrts:~/sdrts/test$ python gr3.2_test.py Traceback (most recent call last): File gr3.2_test.py, line 29, in module app = temp() File gr3.2_test.py, line 26, in __init__ self.start() File /opt/gnuradio/trunk//lib/python2.5/site-packages/gnuradio/gr/top_block.py, line 95, in start self._tb.start() File /opt/gnuradio/trunk//lib/python2.5/site-packages/gnuradio/gr/gnuradio_swig_py_runtime.py, line 1411, in start return _gnuradio_swig_py_runtime.gr_top_block_sptr_start(*args, **kwargs) RuntimeError: multiply_const_ff(4): insufficient connected output ports (1 needed, 0 connected) sd...@sdrts:~/sdrts/test$ There is no error if in h_block2 the connect line is just self.connect(self, gr.null_sink(4)). I am running an ubuntu 8.10 server, same output on 3.1.3, 3.2 and trunk. Thoughts? Kieran ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] hier block inside a hier block
On Thu, Apr 02, 2009 at 10:11:38PM -0700, Johnathan Corgan wrote: On Thu, 2009-04-02 at 22:05 -0700, Josh Blum wrote: Im not sure if there is a ticket about this, maybe http://gnuradio.org/trac/ticket/161 is related. It is related, and the solution to 161 will fix this issue as well. Johnathan I just opened ticket:383 on this. I'm not sure that these are the same problem. We definitely need more QA code for this area of the code. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
