osmocom-sdr

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904 discussions

Hackrf signed issue on gr-osmosdr for ARM
by Del Spangler 25 Nov '15

25 Nov '15

It looks like I'm not the first person to have notices this, because after I submitted a PR to the github project, I noticed another pull request dating from May that has yet to make it into master. Essentially what it boils down to is that char on arm systems, in my case the raspberry pi, are treated as unsigned characters. So right now we have a fix for the hackrf firmware update that only works on x86 systems. A simple change to the source and sink typecasting from char to explicit int8_t on the lookup table on the source.cc should fix this issue for all platforms. In addition, I believe a typecast in the convert function for the sink.cc would do it as well but I have not tested it and I don't believe my current PR reflects that either.

1 0

[PATCH] rtl_fm null squelch
by Wilson Waters 13 Nov '15

13 Nov '15

Hi all, I've created a simple little change for rtl_fm which outputs values of 0 (instead of nothing) when the output is squelched. Use the command option "-E nullsquelch" to enable. This is useful when live streaming output to icecast or similar which requires a constant stream of data (such as http://rtl-sdr.com/forum/viewtopic.php?f=7&t=141 or http://www.windytan.com/2013/07/squelch-it-out.html). Hopefully someone can merge this into the git repo, otherwise just patch and build yourself. Cheers, Wilson -- *Wilson Waters* | Software Engineer *Alintech* e: wilson.waters(a)alintech.com.au w: www.alintech.com.au

1 0

Changing Configuration Parameters Dynamically - OpenBSC
by Amber and Sarosh 04 Nov '15

04 Nov '15

Hi,Can someone inform us if the VTY configuration commands to change parameters e.g. cell id, location area code, MS power etc. that are run on OpenBSC VTY telnet interface take effect on next restart of the OpenBSC session or during the same session? If former is the case, is there any way to dynamically change Cell ID, LAC, MS TX power etc i.e. without restarting the OpenBSC session? Regards, Amber & Sarosh

1 0

[PATCH] rtl_fm null squelch
by Wilson Waters 02 Nov '15

02 Nov '15

Hi all, I've created a simple little change for rtl_fm which outputs values of 0 (instead of nothing) when the output is squelched. Use the -E nullsquelch option to enable. This is useful when live streaming output to icecast or similar which requires a constant stream of data (such as http://rtl-sdr.com/forum/viewtopic.php?f=7&t=141). Cheers, Wilson.

1 0

[PATCH] librtlsdr: conditional USB transfer resubmit
by P 04 Oct '15

04 Oct '15

This patch implements zero-copy overhead for buffers used for sample transfer. This improves a bit performance for applications where low overhead is required and can save a bit of memory. Two changes are made: * add return value for callback function * add function for buffer release when it is free for reuse This change breaks ABI (callback returns int instead of void), but I cannot find way not to do so. Proper change of library version in CMaleList.txt would be required. Please comment on it and let my now if it is interesting enough to be merged upstream. JP

1 0

[PATCH] do not check for NULL before calling free
by P 04 Oct '15

04 Oct '15

Checking if variable is not NULL before calling free() is not effective, because free() already does this. - waste instruction and/or compiler time - more lines of code than necessary This patch removes those checks.

1 0

SoapyRemote: Turn any SDR into a network peripheral
by Josh Blum 02 Oct '15

02 Oct '15

Hey list, I recently put together SoapyRemote, which is a plugin and server app for SoapySDR that lets any supported hardware operate as a network device over a local link: https://github.com/pothosware/SoapyRemote/wiki GrOsmoSDR users should be able to use the Osmo source and sink blocks to work transparently with a remote device. Just make sure that GrOsmoSDR was configured with the support for SoapySDR. I have documented how the device args should be set to use a remote device: https://github.com/pothosware/SoapyRemote/wiki#grosmosdr-remote-devices Extra note: Everything works better with large socket buffers. On linux, users will want to run the sysctl commands here: https://github.com/pothosware/SoapyRemote/wiki#remote-window I had a lot of fun making SoapyRemote, and we have already seen that working with embedded devices has been a big use case. I hope that GrOsmoSDR users will find utility with SoapyRemote as well. Thanks, and happy hacking! -josh

1 0

[PATCH] gr-osmosdr blocks for the Red Pitaya SDR transceiver
by Pavel Demin 01 Oct '15

01 Oct '15

Hello Dimitri, I've put together two simple gr-osmosdr blocks for the Red Pitaya SDR transceiver. They are based on the file block with some pieces borrowed from the rtl_tcp block. Would it be possible to add these blocks to the gr-osmosdr code repository? The patch is in the attachment. Some information about the Red Pitaya SDR transceiver can be found at: http://pavel-demin.github.io/red-pitaya-notes/sdr-transceiver Best regards, Pavel

1 0

[rtl-sdr][PATCH 1/2] rtl_fm: Add scanner progress
by Nikolay Dimitrov 21 Sep '15

21 Sep '15

Add scanner progress, including signal and squelch levels. Rename demod_state->conseq_squelch to demod_state->squelch_conseq. The scanner progress feature can be tested like this: ./rtl_fm -f 144.000M:146.000M:25k -M fm -s 48k -l 100 -t 5 | aplay \ -r 48k -f S16_LE -t raw -c 1 Signed-off-by: Nikolay Dimitrov <picmaster(a)mail.bg> --- src/rtl_fm.c | 43 +++++++++++++++++++++++++++++-------------- 1 file changed, 29 insertions(+), 14 deletions(-) diff --git a/src/rtl_fm.c b/src/rtl_fm.c index e89e42d..04f08a2 100644 --- a/src/rtl_fm.c +++ b/src/rtl_fm.c @@ -131,7 +131,11 @@ struct demod_state int downsample; /* min 1, max 256 */ int post_downsample; int output_scale; - int squelch_level, conseq_squelch, squelch_hits, terminate_on_squelch; + int squelch_level; + int squelch_conseq; + int squelch_hits; + int squelch_signal_rms; + int terminate_on_squelch; int downsample_passes; int comp_fir_size; int custom_atan; @@ -730,7 +734,6 @@ void arbitrary_resample(int16_t *buf1, int16_t *buf2, int len1, int len2) void full_demod(struct demod_state *d) { int i, ds_p; - int sr = 0; ds_p = d->downsample_passes; if (ds_p) { for (i=0; i < ds_p; i++) { @@ -748,17 +751,20 @@ void full_demod(struct demod_state *d) } else { low_pass(d); } + /* power squelch */ if (d->squelch_level) { - sr = rms(d->lowpassed, d->lp_len, 1); - if (sr < d->squelch_level) { + d->squelch_signal_rms = rms(d->lowpassed, d->lp_len, 1); + if (d->squelch_signal_rms < d->squelch_level) { d->squelch_hits++; - for (i=0; i<d->lp_len; i++) { + for (i = 0; i < d->lp_len; i++) { d->lowpassed[i] = 0; } } else { - d->squelch_hits = 0;} + d->squelch_hits = 0; + } } + d->mode_demod(d); /* lowpassed -> result */ if (d->mode_demod == &raw_demod) { return; @@ -814,6 +820,7 @@ static void *demod_thread_fn(void *arg) { struct demod_state *d = arg; struct output_state *o = d->output_target; + while (!do_exit) { safe_cond_wait(&d->ready, &d->ready_m); pthread_rwlock_wrlock(&d->rw); @@ -822,17 +829,20 @@ static void *demod_thread_fn(void *arg) if (d->exit_flag) { do_exit = 1; } - if (d->squelch_level && d->squelch_hits > d->conseq_squelch) { - d->squelch_hits = d->conseq_squelch + 1; /* hair trigger */ + + if (d->squelch_level && d->squelch_hits > d->squelch_conseq) { + d->squelch_hits = d->squelch_conseq + 1; /* hair trigger */ safe_cond_signal(&controller.hop, &controller.hop_m); continue; } + pthread_rwlock_wrlock(&o->rw); memcpy(o->result, d->result, 2*d->result_len); o->result_len = d->result_len; pthread_rwlock_unlock(&o->rw); safe_cond_signal(&o->ready, &o->ready_m); } + return 0; } @@ -909,9 +919,14 @@ static void *controller_thread_fn(void *arg) while (!do_exit) { safe_cond_wait(&s->hop, &s->hop_m); if (s->freq_len <= 1) { - continue;} + continue; + } + /* hacky hopping */ s->freq_now = (s->freq_now + 1) % s->freq_len; + fprintf(stderr, "Frequency: %.3f MHz (signal: %d, squelch: %d)\r", + s->freqs[s->freq_now] / 1e6, demod.squelch_signal_rms, + demod.squelch_level); optimal_settings(s->freqs[s->freq_now], demod.rate_in); rtlsdr_set_center_freq(dongle.dev, dongle.freq); dongle.mute = BUFFER_DUMP; @@ -954,7 +969,7 @@ void demod_init(struct demod_state *s) s->rate_in = DEFAULT_SAMPLE_RATE; s->rate_out = DEFAULT_SAMPLE_RATE; s->squelch_level = 0; - s->conseq_squelch = 10; + s->squelch_conseq = 10; s->terminate_on_squelch = 0; s->squelch_hits = 11; s->downsample_passes = 0; @@ -1027,7 +1042,7 @@ void sanity_checks(void) exit(1); } - if (controller.freq_len > 1 && demod.squelch_level == 0) { + if (controller.freq_len > 1 && !demod.squelch_level) { fprintf(stderr, "Please specify a squelch level. Required for scanning multiple frequencies.\n"); exit(1); } @@ -1085,9 +1100,9 @@ int main(int argc, char **argv) fprintf(stderr, "Oversample must be between 1 and %i\n", MAXIMUM_OVERSAMPLE);} break; case 't': - demod.conseq_squelch = (int)atof(optarg); - if (demod.conseq_squelch < 0) { - demod.conseq_squelch = -demod.conseq_squelch; + demod.squelch_conseq = (int)atof(optarg); + if (demod.squelch_conseq < 0) { + demod.squelch_conseq = -demod.squelch_conseq; demod.terminate_on_squelch = 1; } break; -- 1.7.10.4

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questions about gr-osmosdr
by Pavel Demin 19 Sep '15

19 Sep '15

Hello, I'm working on the gr-osmosdr blocks for the Red Pitaya SDR transceiver. They are based on the file block with some pieces borrowed from the rtl_tcp block. The new blocks are already working and the code can be found at: https://github.com/pavel-demin/gr-osmosdr/tree/master/lib/red_pitaya My notes about the Red Pitaya SDR transceiver can be found at: http://pavel-demin.github.io/red-pitaya-notes/sdr-transceiver I have two questions that I can't find an answer to: - What would be the best way to implement the push-to-talk (PTT) command? I don't see any method reserved for this kind of functionality in gr-osmosdr/lib/sink_impl.h. I can think of putting it to set_if_gain or set_bb_gain but I'm not sure if it's a good idea. - Once the PTT problem solved, what would be the best way to submit a patch with my modifications? Best regards, Pavel

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