osmocom-sdr

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905 discussions

Re: Coding Support
by Hudspeth, Robert Lee 15 Aug '19

15 Aug '19

Thank you for your email, and I appreciate the communication. I did have one last question: If I were to make a change to the code and need to recompile it, are the steps the same ones listed on the wiki under "building the software", or is there a different make process? On Thu, Aug 15, 2019, 10:51 AM Karl <gmkarl(a)gmail.com> wrote: > Hi Robert, > > It sounds like you're looking for the `buf_num` argument to > rtlsdr_read_async. This is in rtl-sdr.h: > https://git.osmocom.org/rtl-sdr/tree/include/rtl-sdr.h#n362 . > > I run into problems like that all the time, myself. Due to my issues, > I've found it hard to collaborate on this project myself. See mailing > list archive of contributions that were minimally addressed. I try to > focus around communication that's more reliable than radio now, like > memo.cash . > > But I'm still passionate about helping rtl-sdr grow. > > Karl > > On 8/15/19, Hudspeth, Robert Lee <hudspero(a)oregonstate.edu> wrote: > > Hello! I am an undergraduate student at Oregon State University working > > with RTL-SDR dongles for an academic project under supervision from > > Benjamin Brewster, and I had a dev question. > > > > I'm trying to run utilities that capture 978 > > <https://github.com/mutability/dump978> & 1090Mhz > > <https://github.com/mutability/dump1090> traffic simultaneously, but I > > can't seem to stop rtl_sdr from allocating too many zero-copy buffers and > > preventing both programs from running simultaneously (I'd like to cut > down > > from 15). I've been through librtlsdr.c and rtl_adsb.c with the hope of > > manually changing some variable that will let me accomplish this to no > > avail. > > > > Is there some line I might have overlooked, or some additional > parameter(s) > > I might need to enter? > > >

1 0

Aw: Coding Support
by Ingo Wolf 15 Aug '19

15 Aug '19

1 0

AW: Re: sdr# version rtlsdr
by Ingo.Wolf＠gmx.de 15 Aug '19

15 Aug '19

4 3

sdr# version rtlsdr
by Ingo.Wolf＠gmx.de 13 Aug '19

13 Aug '19

2 1

rtl_tcp update
by Richard Frye 29 Jul '19

29 Jul '19

I have enabled the direct sampling option to the rtl_tcp. I would like to submit it as a PR but I need authorization. How do we get authorization? Thanks, Richard Frye

1 0

Re: usbfs zerocopy broken on ARM/ARM64
by Nuno Gonçalves 25 Jul '19

25 Jul '19

Dear Steve, Could you give a note if there is still work in progress for a linux fix? I noticed I am affected by this on 5.2, and the last message I find about this is yours on the arm-kernel list dating back to 9 Nov 2018. Thanks, Nuno

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[PATCH] contrib/jenkins.sh: osmo-fl2k build verification
by Oliver Smith 24 Jul '19

24 Jul '19

Related: OS#3203 Signed-off-by: Oliver Smith <osmith(a)sysmocom.de> --- contrib/jenkins.sh | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100755 contrib/jenkins.sh diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh new file mode 100755 index 0000000..8c3b1cf --- /dev/null +++ b/contrib/jenkins.sh @@ -0,0 +1,18 @@ +#!/bin/sh -ex +# This is how we build on jenkins.osmocom.org. + +CFLAGS="-Werror" + +if ! [ -x "$(command -v osmo-clean-workspace.sh)" ]; then + echo "Error: We need to have scripts/osmo-clean-workspace.sh from osmo-ci.git in PATH!" + exit 2 +fi + +osmo-clean-workspace.sh +cmake \ + -DINSTALL_UDEV_RULES=ON \ + -DCMAKE_C_FLAGS="$CFLAGS" \ + . +make $PARALLEL_MAKE +make DESTDIR="_install" install +osmo-clean-workspace.sh -- 2.11.0

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Receiving UTAs on 978 Mhz
by Yaron Haddi 22 Jul '19

22 Jul '19

2 5

ADS-B reed-solomon ?
by Brad Walker 20 Jul '19

20 Jul '19

I've been studying the rtl_adsb.c code and it's very interesting how it works.. But, I have question. I noticed that if I request verbose output using the "-V" option, then the CRC is printed out. But, it doesn't look like the code actually does any Reed-Soloman error correction to the data the ADS-B specification documents. Am I reading this correctly? Thanks. -brad w.

2 1

Patch submission
by Vincent Perrier 12 Jul '19

12 Jul '19

Fix memory leak in librtlsdr. The problem came up when using rtlsdr_open() twice with the same index. The variable dev->devh is never cleaned if libusb_claim_interface() fails. This causes a leak if the device is already claimed by another handle. rtlsdr_close() did not free that space since the returned handle is invalid if libusb_claim_interface fails Here is the patch file in text format. (it is also joined to this email). ~~~~ diff --git a/src/librtlsdr.c b/src/librtlsdr.c index a71609b..89ec903 100644 --- a/src/librtlsdr.c +++ b/src/librtlsdr.c @@ -1520,10 +1520,6 @@ int rtlsdr_open(rtlsdr_dev_t **out_dev, uint32_t index) r = libusb_claim_interface(dev->devh, 0); if (r < 0) { fprintf(stderr, "usb_claim_interface error %d\n", r); - if (dev) - { - libusb_close(dev->devh); - } goto err; } ~~~~ -Vincent Perrier

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