osmocom-sdr

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Fwd: rtl_test patch
by Nuno Gonçalves 02 Nov '13

02 Nov '13

I'm not sure it this was overlooked or if I should format it any other way... Regards, Nuno ---------- Forwarded message ---------- From: Nuno Gonçalves <nunojpg(a)gmail.com> Date: Sun, Apr 21, 2013 at 6:59 PM Subject: rtl_test patch To: osmocom-sdr(a)lists.osmocom.org Corrects bugs where: Cumulative PPM error is always "342" if execution stopped before first PPM_DURATION. PPM error alias to wrong values if over +-1045 (this happens quite a lot actually due to bug reported at [1]). Behavior changes: Cumulative PPM error value is now printed every PPM_DURATION so the user can check when it is settled. [1] http://lists.osmocom.org/pipermail/osmocom-sdr/2013-April/000584.html Thanks, Nuno Signed-off-by: Nuno Goncalves <nunojpg(a)gmail.com> diff --git a/src/rtl_test.c b/src/rtl_test.c index f5a56b8..c705e04 100644 --- a/src/rtl_test.c +++ b/src/rtl_test.c @@ -55,6 +55,8 @@ static int ppm_benchmark = 0; static int64_t ppm_count = 0L; static int64_t ppm_total = 0L; +static uint32_t samp_rate = DEFAULT_SAMPLE_RATE; + #ifndef _WIN32 static struct timespec ppm_start; static struct timespec ppm_recent; @@ -108,6 +110,7 @@ static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx) { uint32_t i, lost = 0; int64_t ns; + int real_rate; if (uninit) { bcnt = buf[0]; @@ -141,17 +144,23 @@ static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx) if (ppm_now.tv_sec - ppm_recent.tv_sec > PPM_DURATION) { ns = 1000000000L * (int64_t)(ppm_now.tv_sec - ppm_recent.tv_sec); ns += (int64_t)(ppm_now.tv_nsec - ppm_recent.tv_nsec); - printf("real sample rate: %i\n", + printf("real sample rate: %i", (int)((1000000000L * ppm_count / 2L) / ns)); - #ifndef __APPLE__ - clock_gettime(CLOCK_REALTIME, &ppm_recent); - #else - gettimeofday(&tv, NULL); - ppm_recent.tv_sec = tv.tv_sec; - ppm_recent.tv_nsec = tv.tv_usec*1000; - #endif + ppm_total += ppm_count / 2L; ppm_count = 0L; + + #ifndef _WIN32 + ns = 1000000000L * (int64_t)(ppm_now.tv_sec - ppm_start.tv_sec); + ns += (int64_t)(ppm_now.tv_nsec - ppm_start.tv_nsec); + real_rate = (int)(ppm_total * 1000000000L / ns); + printf(" cumulative PPM error: %.1f\n", + (1000000.0 * (real_rate - (int)samp_rate)) / samp_rate); + #else + printf("\n"); + #endif + + ppm_recent = ppm_now; } #endif } @@ -213,13 +222,10 @@ int main(int argc, char **argv) int sync_mode = 0; uint8_t *buffer; uint32_t dev_index = 0; - uint32_t samp_rate = DEFAULT_SAMPLE_RATE; uint32_t out_block_size = DEFAULT_BUF_LENGTH; int device_count; int count; int gains[100]; - int real_rate; - int64_t ns; while ((opt = getopt(argc, argv, "d:s:b:tpS::")) != -1) { switch (opt) { @@ -365,15 +371,6 @@ int main(int argc, char **argv) if (do_exit) { fprintf(stderr, "\nUser cancel, exiting...\n"); - if (ppm_benchmark) { -#ifndef _WIN32 - ns = 1000000000L * (int64_t)(ppm_recent.tv_sec - ppm_start.tv_sec); - ns += (int64_t)(ppm_recent.tv_nsec - ppm_start.tv_nsec); - real_rate = (int)(ppm_total * 1000000000L / ns); - printf("Cumulative PPM error: %i\n", - (int)round((double)(1000000 * (real_rate - (int)samp_rate)) / (double)samp_rate)); -#endif - } } else fprintf(stderr, "\nLibrary error %d, exiting...\n", r);

1 0

I/Q data for dummies
by Skip Tavakkolian 31 Oct '13

31 Oct '13

I'm not an RF engineer and know enough of the physics of it to be dangerous. My approach to rtl-sdr is purely utilitarian -- i.e. using it to develop applications. The following tutorial, by Mikael Q Kuisma, on I/Q data was very useful to me and might benefit others on the list. http://whiteboard.ping.se/SDR/IQ -Skip

1 0

RTL-SDR Error code -3
by Jonathan Rawlinson 30 Oct '13

30 Oct '13

Hello all I am trying to get the python wrapper "pyrtlsdr" working on Windows, it works fine on Linux The dongle works fine in SDR-SHARP.exe It imports correctly but prints the following error when I try to initialize the Dongle: Traceback (most recent call last): File "C:\Users\M0ZJO\Desktop\RA_Astro\FFTPrint Test.py", line 4, in <module> sdr = RtlSdr() File "build\bdist.win32\egg\rtlsdr\rtlsdr.py", line 60, in __init__ % (result, device_index)) IOError: Error code -3 when opening SDR (device index = 0) RTL_FM also returns the same error. Can anyone help? I would be very grateful! Many thanks Jonathan/M0ZJO

2 1

rtl_fm.exe issue or an I doing something wrong?
by Chris Hanson 28 Oct '13

28 Oct '13

I just downloaded the RelWithDebInfo precompiled windows software that was posted on Oct 24th. I am using an E4000 dongle which has a PPM of +30. I am trying to listen to 424.175MHz and I'm using this: rtl_fm -p 30 -d 1 -N -o 4 -f 424.175M -s 16k -C|sox -r 16000 -t .raw -e signed-integer -b 16 -c 1 -V1 - -d everything is playing fine. I can hear 424.175MHz. The issue is that I'm hearing another station 50KHz higher on 424.225Mhz in addition to the frequency I want. So it looks as if it's not using a 16Khz filter. Am I doing something wrong or is there an issue with rtl_fm.exe? Thanks Chris

2 1

rtl_fm stereo?
by Pete Ashdown 24 Oct '13

24 Oct '13

Tried searching on this and didn't find much. Is rtl_fm stereo capable? When I encode with lame's "-m s" flag the output is at half the sample rate (ie: speeded up). Do I need to feed it double the sample rate, or am I barking up the wrong tree entirely? Thank you.

3 2

API for forwarding remote control commands
by Skip Tavakkolian 21 Oct '13

21 Oct '13

Hi, Since all DVB-T receivers come with an IR remote control, I'm wondering if there is an API that can be used to receive the remote commands? Thanks, -Skip

1 0

Problems on CentOS 6 64 bit
by Dan 13 Oct '13

13 Oct '13

Hi all, I have compiled and installed rtl-sdr on CentOS 6 following instructions. Everything compiles without errors, but: - when I run rtl_test I get the following errors: Found 1 device(s): 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Found Rafael Micro R820T tuner Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6 Info: This tool will continuously read from the device, and report if samples get lost. If you observe no further output, everything is fine. Reading samples in async mode... cb transfer status: 5, canceling... cb transfer status: 5, canceling... cb transfer status: 5, canceling... cb transfer status: 5, canceling... cb transfer status: 5, canceling... cb transfer status: 5, canceling... cb transfer status: 5, canceling... cb transfer status: 5, canceling... Library error 0, exiting... If I run rtl_tcp I get the following errors when the client tries to connect: Found 1 device(s). Found Rafael Micro R820T tuner Using ezcap USB 2.0 DVB-T/DAB/FM dongle Tuned to 100000000 Hz. listening... Use the device argument 'rtl_tcp=192.168.33.99:8767' in OsmoSDR (gr-osmosdr) source to receive samples in GRC and control rtl_tcp parameters (frequency, gain, ...). client accepted! set freq 145000000 cb transfer status: 5, canceling... cb transfer status: 5, canceling... rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 set sample rate 1024000 rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 set freq correction 4 rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 rtlsdr_demod_write_reg failed with -4 rtlsdr_demod_read_reg failed with -4 worker cond timeout Signal caught, exiting! comm recv bye Signal caught, exiting! all threads dead.. listening... The same client connects without errors to another rtl_tcp instance on a Windows 7 computer, with the same module. Any help is greatly appreciated. Thanks, Dan

6 22

Boost required to build gr-osmosdr
by Sohaib Khan 11 Oct '13

11 Oct '13

Boost required to build gr-osmosdr I get this error... how can i solve it Sohaib bin altaf

1 0

rtl_sdr and lysdr?
by Alan Corey 11 Oct '13

11 Oct '13

I found this program yesterday: https://github.com/gordonjcp/lysdr It's the GUI part of a minimal HDSDR/SDR# type program but it needs an IQ stream from something. It seems to be mostly intended for use with Softrocks but I wonder if anyone's been able to feed something like the output from rtl_sdr into it? It's got some Python and some C, requires Jackaudio. I was able to build it and run it under OpenBSD 5.2 without much trouble. Only does USB/LSB as written, Googling doesn't find me anything connecting it with any Osmocom stuff. rtl_tcp through Netcat might work better because it seems to want to control the frequencies. I've only got a couple of $20 dongles. ----- Radio Astronomy - the ultimate DX

5 4

rtlsdr_read_reg failed with -7
by Petter Gustad 11 Oct '13

11 Oct '13

I keep getting the message "rtlsdr_read_reg failed with -7" whenever I run any of the rtl_ commands. When I run the command after re-plugging the stick it usually works (except the lost samples): rtl_test Found 1 device(s): 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Found Fitipower FC0013 tuner Supported gain values (23): -9.9 -7.3 -6.5 -6.3 -6.0 -5.8 -5.4 5.8 6.1 6.3 6.5 6.7 6.8 7.0 7.1 17.9 18.1 18.2 18.4 18.6 18.8 19.1 19.7 Info: This tool will continuously read from the device, and report if samples get lost. If you observe no further output, everything is fine. Reading samples in async mode... lost at least 84 bytes But if I run any of the rtl_ commands after breaking any previous running command I get: rtl_test Found 1 device(s): 0: ezcap USB 2.0 DVB-T/DAB/FM dongle Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle rtlsdr_read_reg failed with -7 rtlsdr_write_reg failed with -7 rtlsdr_read_reg failed with -7 rtlsdr_write_reg failed with -7 rtlsdr_read_reg failed with -7 rtlsdr_write_reg failed with -7 Is there a way to completely reset the driver other than re-plugging it? I'm running Gentoo Linux (3.2.1 kernel) Thanks! //Petter

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