NBFM problem with rtl_fm on Raspberry Pi 2

Hayati Ayguen h_ayguen at web.de
Wed Jul 8 19:17:26 UTC 2015


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.

The result: this works fine!
Do i have to conclude, that Raspbian's g++/gcc compiler does produce
wrong code when executed on RPi 2 ?!
gcc/g++ (Debian 4.6.3-14+rpi1) 4.6.3

OK, now verify: make clean, rebuild and install new binary (from the
build directory copied from RPi 1):
this works!  but, i don't understand why!
Now reboot, so that kernel module reloads:  still works!

In the end, i'm happy that it works "somehow". But, i've no idea where
the problem lies!

kind regards,

Am 08.07.2015 um 09:38 schrieb "Hayati Aygün":
> Hi Marcus,
> librtlsdr is OK, because rtl_tcp works fine, which transfers full I/Q
> spectrum of ~ 1.4 MHz to SDR# on Windows/PC.
> 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.
> Something else i could try: use the binary compiled on Raspi 1 B+ on
> the Raspi 2. I'll check this, this evening.
> Before going for painful debugging, it would be fine if someone else
> could reproduce the problem .. or say that it works fine.
> kind regards,
> Hayati
> *Gesendet:* Mittwoch, 08. Juli 2015 um 08:30 Uhr
> *Von:* "Marcus Müller" <marcus.mueller at ettus.com>
> *An:* osmocom-sdr at lists.osmocom.org
> *Betreff:* Re: NBFM problem with rtl_fm on Raspberry Pi 2
> Hi Hayati,
> I'm totally not used to development on Raspbian, but:
> It's really strange that running the same software on the same distro
> with the same RF device would give different results.
> So, debugging is on :/ I'd say you should use rtl_sdr to get raw IQ
> samples, and then have a look at them on your PC. If they are ok, one
> would have to look a bit deeper into rtl_fm, if not, something goes
> wrong on the librtlsdr side of things.
> Best regards,
> Marcus

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