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Discuss RTL-SDR and cheap software defined radio
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PostPosted: Sat Mar 18, 2017 2:15 pm 
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Joined: Sat Mar 18, 2017 1:31 pm
Posts: 4
"rtl_test" does not work on Raspberry Pi3 properly.
I want to know how to solve this problem.

>Found 1 device(s):
> 0: Generic, RTL2832U, SN: ****************
>
>Using device 0: Generic RTL2832U
>usb_claim_interface error -6
>Failed to open rtlsdr device #0.

I installed rtl-sdr on Raspberry Pi3 in the way as described on the following link.
"https://gist.github.com/floehopper/99a0c8931f9d779b0998"

And I made "rtlsdr.conf" file at "/etc/modprobe.d/" as follows.

>blacklist dvb_usb_rtl28xxu
>blacklist rtl2830
>blacklist rtl2832
>blacklist dvb_usb_v2
>blacklist dvb_core

And I checked by "lsmod" command that there are no DVB related devices.

raspberrypi 4.4.50-v7+ #970
armv7l

Thanks.


Last edited by eightok on Sun Mar 19, 2017 5:14 am, edited 2 times in total.

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PostPosted: Sat Mar 18, 2017 10:11 pm 
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Posts: 1064
Does anything change if you run rtl_test as root?


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PostPosted: Sun Mar 19, 2017 5:10 am 
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Joined: Sat Mar 18, 2017 1:31 pm
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rtlsdrblog wrote:
Does anything change if you run rtl_test as root?


Thanks for your reply.
I tried rtl_test as root, but nothing changed.


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PostPosted: Sun Mar 19, 2017 5:14 pm 
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Joined: Sat Jan 14, 2017 11:07 pm
Posts: 22
eightok wrote:
"rtl_test" does not work on Raspberry Pi3 properly.
>usb_claim_interface error -6
>Failed to open rtlsdr device #0.


I got a similar error under the latest Raspian, I found I had to change the build script to use this line:

Code:
cmake ../ -DINSTALL_UDEV_RULES=ON -DDETACH_KERNEL_DRIVER=ON


Not sure why...


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PostPosted: Mon Mar 20, 2017 2:51 am 
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Joined: Sat Mar 18, 2017 1:31 pm
Posts: 4
hotpaw2 wrote:
Code:
cmake ../ -DINSTALL_UDEV_RULES=ON -DDETACH_KERNEL_DRIVER=ON

Not sure why...


Thank you for your reply.
I also tested this one, but nothing changed...


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PostPosted: Mon Mar 20, 2017 4:11 am 
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Joined: Sat Mar 18, 2017 1:31 pm
Posts: 4
It worked!

Only after reboot, it did not work.
But, once I disconnected the dongle hardware manually, and again connected it manually, it began to work.

But why?


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