Re: [Discuss-gnuradio] Get error 3 when trying to connect to RTL-SDR

[Ed Troy]

Hi,

I tried that, but I am still getting an error as shown below:

address@hidden:~/prefix/default$ gnuradio-companion
<<< Welcome to GNU Radio Companion 3.7.12git-269-g8aa965c6 >>>

Block paths:
    /home/edtroy/prefix/default/share/gnuradio/grc/blocks

Loading: "/home/edtroy/prefix/default/src/gr-tutorial/examples/tutorial6/gr-tutorial-broadcast-fm-rx.grc"
>>> Done

Generating: '/home/edtroy/prefix/default/src/gr-tutorial/examples/tutorial6/top_block.py'

Executing: /usr/bin/python2 -u /home/edtroy/prefix/default/src/gr-tutorial/examples/tutorial6/top_block.py

gr-osmosdr v0.1.4-98-gc653754d (0.1.5git) gnuradio 3.7.12git-269-g8aa965c6
built-in source types: file osmosdr fcd rtl rtl_tcp uhd hackrf bladerf rfspace airspy soapy redpitaya
[INFO] [UHDlinux; GNU C++ version 6.3.0 20170406; Boost_106200; UHD_3.11.0.git-191-g1cd96dde]
Using device #0 Generic RTL2832U OEM
usb_open error -3
Please fix the device permissions, e.g. by installing the udev rules file rtl-sdr.rules

FATAL: Failed to open rtlsdr device.

Trying to fill up 1 missing channel(s) with null source(s).
This is being done to prevent the application from crashing
due to gnuradio bug #528.

I changed the file I wrote to /etc/udev/rules.d/rtl-sdr.rules to the following--changing 2838 to 4014 since that was the other instance of the dongle that I found, as explained below. I also tried with no rtl-sdr.rules file and that did not work either:

SUBSYSTEM=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="4014", GROUP="adm", MODE="0666", SYMLINK+="rtl_sdr"

Ed

On 9/28/2017 4:20 PM, Federico 'Larroca' La Rocca wrote:

Hi,

I think you've forgotten to blacklist the dvbt driver. In Ubuntu, you have to add the following line to /etc/modprobe.d/blacklist.conf: blacklist dvb_usb_rtl28xxu.

best

Federico

2017-09-28 17:11 GMT-03:00 Ed Troy <address@hidden>:

I am trying to run a simple fm receiver example using a RTL-SDR dongle. It is connected. But, when I run, I get the following errors:

gr-osmosdr v0.1.4-98-gc653754d (0.1.5git) gnuradio 3.7.12git-269-g8aa965c6
built-in source types: file osmosdr fcd rtl rtl_tcp uhd hackrf bladerf rfspace airspy soapy redpitaya
[INFO] [UHDlinux; GNU C++ version 6.3.0 20170406; Boost_106200; UHD_3.11.0.git-191-g1cd96dde]
Using device #0 Generic RTL2832U OEM
usb_open error -3
Please fix the device permissions, e.g. by installing the udev rules file rtl-sdr.rules

FATAL: Failed to open rtlsdr device.

Trying to fill up 1 missing channel(s) with null source(s).
This is being done to prevent the application from crashing
due to gnuradio bug #528.


So, I did a lsusb command and got the following:

address@hidden:/etc/udev/rules.d$ lsusb
Bus 001 Device 004: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T
Bus 001 Device 002: ID 0bda:4014 Realtek Semiconductor Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 004: ID 0e0f:0008 VMware, Inc.
Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub
Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

I'm not sure which is the device that I should use, but I think it is Device 004. So, I wrote a file named rtlsdr.rules that I put in the directory    /etc/udev/rules.d/ . That file consists of the following:

SUBSYSTEM=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="2838", GROUP="adm", MODE="0666", SYMLINK+="rtl_sdr"

But, when I try to run the example, I still get the above error. Any ideas what I am doing wrong and need to do to get RTLSDR dongle to work?


Ed


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