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Hello,<br>
<br>
there's no NBFM demodulation problem when using Debian Jessie on
Raspi2<br>
<a class="moz-txt-link-freetext" href="http://sjoerd.luon.net/posts/2015/02/debian-jessie-on-rpi2/">http://sjoerd.luon.net/posts/2015/02/debian-jessie-on-rpi2/</a><br>
<br>
and compiling everything necessary on thr Raspi2 itself.<br>
This distri comes with gcc 4.9.2.<br>
Thanks to Murat for his tip to try Jessie.<br>
<br>
Now i get useful audio - with some noise in the background, what i
have to check with raw mode.<br>
But it's now understandable audio, what wasn't the case with
Raspbian (based on Debian Wheezy, coming with gcc 4.6.3).<br>
<br>
kind regards,<br>
Hayati<br>
<br>
<br>
<div class="moz-cite-prefix">Am 08.07.2015 um 21:17 schrieb Hayati
Ayguen:<br>
</div>
<blockquote cite="mid:559D7746.9040308@web.de" type="cite">
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Hello,<br>
<br>
now tested the binary compiled on RPi 1 on the RPi 2 - after
copying the full source including build directory of cmake and
executing "sudo make install" on the RPi 2.<br>
<br>
The result: this works fine!<br>
Do i have to conclude, that Raspbian's g++/gcc compiler does
produce wrong code when executed on RPi 2 ?!<br>
gcc/g++ (Debian 4.6.3-14+rpi1) 4.6.3<br>
<br>
OK, now verify: make clean, rebuild and install new binary (from
the build directory copied from RPi 1):<br>
this works! but, i don't understand why!<br>
Now reboot, so that kernel module reloads: still works!<br>
<br>
In the end, i'm happy that it works "somehow". But, i've no idea
where the problem lies!<br>
<br>
kind regards,<br>
Hayati<br>
<br>
<br>
<div class="moz-cite-prefix">Am 08.07.2015 um 09:38 schrieb
"Hayati Aygün":<br>
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<blockquote
cite="mid:trinity-51cb14fb-b49c-4546-9533-55c3891e9a7e-1436341125854@3capp-webde-bs27"
type="cite">
<div style="font-family: Verdana;font-size: 12.0px;">
<div>
<div> </div>
<div>Hi Marcus,</div>
<div> </div>
<div>librtlsdr is OK, because rtl_tcp works fine, which
transfers full I/Q spectrum of ~ 1.4 MHz to SDR# on
Windows/PC.</div>
<div>The problem must lie in rtl_fm. By the way, the I/Q
demodulation "raw" mode is erroneous, too, when having
compiled on Raspberry Pi 2.</div>
<div>Something else i could try: use the binary compiled on
Raspi 1 B+ on the Raspi 2. I'll check this, this evening.</div>
<div> </div>
<div>Before going for painful debugging, it would be fine if
someone else could reproduce the problem .. or say that it
works fine.</div>
<div> </div>
<div>kind regards,</div>
<div>Hayati</div>
<div> </div>
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<div name="quote" style="margin:10px 5px 5px 10px;
padding: 10px 0 10px 10px; border-left:2px solid
#C3D9E5; word-wrap: break-word; -webkit-nbsp-mode:
space; -webkit-line-break: after-white-space;">
<div style="margin:0 0 10px 0;"><b>Gesendet:</b> Mittwoch,
08. Juli 2015 um 08:30 Uhr<br>
<b>Von:</b> "Marcus Müller" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:marcus.mueller@ettus.com"><marcus.mueller@ettus.com></a><br>
<b>An:</b> <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:osmocom-sdr@lists.osmocom.org">osmocom-sdr@lists.osmocom.org</a><br>
<b>Betreff:</b> Re: NBFM problem with rtl_fm on
Raspberry Pi 2</div>
<div name="quoted-content">Hi Hayati,<br>
<br>
I'm totally not used to development on Raspbian, but:<br>
It's really strange that running the same software on
the same distro<br>
with the same RF device would give different results.<br>
<br>
So, debugging is on :/ I'd say you should use rtl_sdr
to get raw IQ<br>
samples, and then have a look at them on your PC. If
they are ok, one<br>
would have to look a bit deeper into rtl_fm, if not,
something goes<br>
wrong on the librtlsdr side of things.<br>
<br>
Best regards,<br>
Marcus</div>
</div>
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