osmocom-sdr

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917 discussions

Cmd structure for rtl_tcp
by jmaurin＠jonis.com.br 29 Dec '15

29 Dec '15

Hi List! I'm new here, so I hope I'm asking for help in the right place. I'm trying to build and application that read I/Q data from rtl_tcp using Delphi. For beginning, I'm trying to set some params for rtl_tcp using my remote app. I found the source code of rtl_tcp and I could identify some information about what is each command, like 0x01 (hex) is to set frequency, 0x02 to set sample, etc.... What I don't undertand is the structure of parameters. Each parameter is one byte? If not, how parameters are sent? Do I need to send char to end command, like end of line or carrier return? Is not, what's the correct structure for sending commands? For example: For setting gain, send one byte with 0x04 and another byte indicating the gain index. Tks! Jonis Maurin Ceará

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gr-osmosdr fixes for soapy support, and msvc
by Josh Blum 07 Dec '15

07 Dec '15

Hey list, It looks like due to some GRC changes, the throw in set_iq_balance_mode() is no longer caught. Its causing a problem for GRC users and I would like upstream the fix. See soapy_support: http://cgit.osmocom.org/gr-osmosdr/log/?h=soapy_support I am building GNURadio and gr-osmosdr as part of my PothosSDR installer: https://github.com/pothosware/PothosSDR/wiki/GNURadio There were a few minor fixes to make for the MSVC compiler. The commits have explanatory messages, and I made sure that they were non-breaking. I would also like to upstream these fixes as well. See msvc_fixes: http://cgit.osmocom.org/gr-osmosdr/log/?h=msvc_fixes Thanks for your consideration, -josh

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[PATCH] save gain only when set_gain is successful
by Joseph Poirier 29 Nov '15

29 Nov '15

Signed-off-by: Joseph Poirier <jdpoirier(a)gmail.com> --- src/librtlsdr.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/src/librtlsdr.c b/src/librtlsdr.c index cdf1ca9..fd435b7 100644 --- a/src/librtlsdr.c +++ b/src/librtlsdr.c @@ -1038,13 +1038,10 @@ int rtlsdr_set_tuner_gain(rtlsdr_dev_t *dev, int gain) rtlsdr_set_i2c_repeater(dev, 1); r = dev->tuner->set_gain((void *)dev, gain); rtlsdr_set_i2c_repeater(dev, 0); + if (!r) + dev->gain = gain; } - if (!r) - dev->gain = gain; - else - dev->gain = 0; - return r; } -- 2.5.0

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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.

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[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

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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

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[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

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[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 01 Oct '15

01 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

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