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by Efcis
Tue Jan 15, 2019 3:16 pm
Forum: Beginners
Topic: Image update for a newer RasPi
Replies: 2
Views: 495

Re: Image update for a newer RasPi

Thanks for your detailed reply and your help !
by Efcis
Tue Jan 15, 2019 12:21 am
Forum: Beginners
Topic: Image update for a newer RasPi
Replies: 2
Views: 495

Image update for a newer RasPi

Hi I want to use an specific image designed in August 2016 with a RasPi 2 B v1.2, which was released after the image built date. https://remoteqth.com/download-count.php?Down=data/remoteqth-server-20160813.img.zip (488 MB | 1409x sha1sum eaccd041878bed127061c37165876e7952a9a581) Obviously, when tryi...
by Efcis
Tue Feb 03, 2015 2:19 am
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 111475

Re: The Raspberry Pi 2 Q&A thread

According to other posts, Win10 for Pi2 won't have any GUI. Can you confirm ?

And what about the Ubuntu distro for the Pi2 ?

Thanks !
by Efcis
Tue Aug 07, 2012 10:11 am
Forum: Other projects
Topic: Simple Ham Radio FM receiver with rtl-sdr
Replies: 26
Views: 59559

Re: Simple Ham Radio FM receiver with rtl-sdr

Hi I'm not very familiar with getting version numbers of my installed packages but here's the listing of the dpkg command if it can help : [email protected] ~ $ dpkg -l libusb* Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Er...
by Efcis
Thu Aug 02, 2012 8:00 pm
Forum: Other projects
Topic: Simple Ham Radio FM receiver with rtl-sdr
Replies: 26
Views: 59559

Re: Simple Ham Radio FM receiver with rtl-sdr

I finally edited /etc/asound.conf with : [email protected] ~ $ cat /etc/asound.conf pcm.!default { type hw card 0 } ctl.!default { type hw card 0 } pcm.usb { type plug slave { pcm "hw:1,0" } } ctl.usb { type plug slave { ctl "hw;1,0" } } [email protected] ~ $ Note : I'm not sure the ctl section requires t...
by Efcis
Thu Aug 02, 2012 4:13 pm
Forum: Other projects
Topic: Simple Ham Radio FM receiver with rtl-sdr
Replies: 26
Views: 59559

Re: Simple Ham Radio FM receiver with rtl-sdr

Just received today one of the USB dongle I ordered. Unfortunately, as a Linux / Rasbian newbie I can't find how to use it with aplay or even the plain speaker-test utility. I *guess* the name of the device to use is "front" (no quotes), according to the aplay -L command : [email protected] ~/dvpt/rtl-...
by Efcis
Mon Jul 30, 2012 11:41 pm
Forum: Raspbian
Topic: How to extend or replace the swap space ?
Replies: 3
Views: 2155

Re: How to extend or replace the swap space ?

Thanks to both of you. I used the easiest way (swap file), while keeping the RAM swap with a higher priority to favor it. The swap file was only used for few large files of the project to be compiled. zram looks very interesting. Maybe it could be embedded in a next rasbian image (with a modified ke...
by Efcis
Mon Jul 30, 2012 10:22 am
Forum: Raspbian
Topic: How to extend or replace the swap space ?
Replies: 3
Views: 2155

How to extend or replace the swap space ?

Hi I'm trying to build a very large project (gnuradio), and my make was interrupted by this error : [ 49%] Building CXX object gnuradio-core/src/lib/swig/CMakeFiles/_gnuradio_core_general.dir/gnuradio_core_generalPYTHON_wrap.cxx.o virtual memory exhausted: Cannot allocate memory make[2]: *** [gnurad...
by Efcis
Fri Jul 27, 2012 12:42 pm
Forum: Other projects
Topic: Simple Ham Radio FM receiver with rtl-sdr
Replies: 26
Views: 59559

Re: Simple Ham Radio FM receiver with rtl-sdr

I finally installed Ubuntu into a VirtualBox VM on my Windows machine. rtl_fm doesn't work much better on it than my previous experiments with the raspi. I still get constant underruns, while the CPU load of rtl_fm is only around 3% on it. A bit disappointing... I also tried to run rtl_fm on the ras...
by Efcis
Thu Jul 26, 2012 6:52 pm
Forum: Other projects
Topic: Simple Ham Radio FM receiver with rtl-sdr
Replies: 26
Views: 59559

Re: Simple Ham Radio FM receiver with rtl-sdr

Have you tried using rtl_sdr and stream to a remote machine? Do you get buffer under-runs/crashes as well? It seems to be more stable if I do the other way around with my card both under rtl_sdr and rtl_fm. I.e lower the sampling rate. Actually, I don't have another linux machine at hand. I guess m...
by Efcis
Thu Jul 26, 2012 1:05 pm
Forum: Other projects
Topic: Simple Ham Radio FM receiver with rtl-sdr
Replies: 26
Views: 59559

Re: Simple Ham Radio FM receiver with rtl-sdr

I haven't build gnuRadio personally (rtl_fm is standalone), but there are instructions here
by Efcis
Wed Jul 25, 2012 3:22 pm
Forum: Other projects
Topic: Simple Ham Radio FM receiver with rtl-sdr
Replies: 26
Views: 59559

Re: Simple Ham Radio FM receiver with rtl-sdr

Could you post how you built rtl_fm on your rpi? Follow the instructions here: http://sdr.osmocom.org/trac/wiki/rtl-sdr FYI, I just did : sudo apt-get install git libusb-dev libusb-1.0 libtool cmake to install requirements (I'm using raspbian and use the beta "alsa sound driver" - check this ) Hope...
by Efcis
Mon Jul 23, 2012 5:12 pm
Forum: Other projects
Topic: Simple Ham Radio FM receiver with rtl-sdr
Replies: 26
Views: 59559

Re: Simple Ham Radio FM receiver with rtl-sdr

I'll try to find a Schottky diode to lower the overall voltage and keep it "nominal". Meanwhile I modified the rtl_fm.c code a bit, and tried several 'capture' rate (from 1Msps to 2.4 Msps), for a given output rate (24k). Quite strangely, the underruns are less frequent with a higher capture rate, w...
by Efcis
Sat Jul 21, 2012 7:35 pm
Forum: Raspbian
Topic: ALSA on Raspbian
Replies: 167
Views: 171480

Re: ALSA on Raspbian

@Dom @kadamski Actually, I had to recreate a complete SD from scratch :-( I wonder if I could modify/rename start.elf from the raspi itself in use ? Anyway, I can now clearly read 11025 and 22050 samples/s files on the external analog output. \o/ Congratulations to both of you. I'm still facing unde...
by Efcis
Sat Jul 21, 2012 5:23 pm
Forum: Raspbian
Topic: ALSA on Raspbian
Replies: 167
Views: 171480

Re: ALSA on Raspbian

Not very familiar with these files, actually. I replaced start.elf in the /boot directory by the proposed start_alsa.elf (after renaming), but further reboots hang. Do I miss something ?
by Efcis
Sat Jul 21, 2012 3:46 pm
Forum: Raspbian
Topic: ALSA on Raspbian
Replies: 167
Views: 171480

Re: ALSA on Raspbian

@Dom @kadamski I don't know if it can help, but I'm constantly experiencing underrun errors (sent by aplay I guess) every 5 seconds or so, when sendind thru stdin 16 bit audio samples (mono) sampled at 44100 or 48000. I'm trying to use a DVB-T stick with the raspi. Check my project thread for more d...
by Efcis
Sat Jul 21, 2012 3:06 pm
Forum: Other projects
Topic: Simple Ham Radio FM receiver with rtl-sdr
Replies: 26
Views: 59559

Re: Simple Ham Radio FM receiver with rtl-sdr

Few indications on my progress : The ALSA thing can't handle for now sampling rates different from 44.1 kHz and 48 kHz. There is a dedicated thread on this issue in the Raspbian forum. Check here . For the record, I'm currently using the analog (jack) audio output. Maybe it differs with the HDMI out...
by Efcis
Thu Jul 19, 2012 9:41 pm
Forum: Raspbian
Topic: ALSA on Raspbian
Replies: 167
Views: 171480

Re: ALSA on Raspbian

@kadamski Thanks for your efforts. I must confess I'm kind of lost at this point to help you ;-)
Regards
by Efcis
Thu Jul 19, 2012 7:00 pm
Forum: Raspbian
Topic: ALSA on Raspbian
Replies: 167
Views: 171480

Re: ALSA on Raspbian

Is it possible to give me access to the not working .wav file so I could experiment with it? Sure. Please, check http://f6fvy.free.fr/raspi/ These files are raw files (not wav), 1 channel (mono), signed 16 bit integer for each sample (thus the -f S16_LE switch in the aplay command). Thanks for your...
by Efcis
Thu Jul 19, 2012 6:30 pm
Forum: Raspbian
Topic: ALSA on Raspbian
Replies: 167
Views: 171480

Re: ALSA on Raspbian

You have problems only when playing using pulseaudio or also without it? Unfortunately, I don't have any knowledge about pulseaudio right now. If you're replying to me (not sure), I don't use pulseaudio at all. I just try to play plain mono binary raw files stored on my SD card (or the stdin pipe) ...
by Efcis
Thu Jul 19, 2012 3:03 pm
Forum: Raspbian
Topic: ALSA on Raspbian
Replies: 167
Views: 171480

Re: ALSA on Raspbian

Sorry for hijacking this thread, but are your various experiment could also resolve https://github.com/raspberrypi/firmware/issues/62, or is a different topic ?

I'm trying to play low sample rates (11025 or 22050) mono raw files with aplay with no success.
by Efcis
Tue Jul 17, 2012 10:16 pm
Forum: Other projects
Topic: Simple Ham Radio FM receiver with rtl-sdr
Replies: 26
Views: 59559

Simple Ham Radio FM receiver with rtl-sdr

Inspired by http://www.reddit.com/r/RTLSDR/comments/uc8yt/simple_and_low_resource_scanner_rtl_fm/ , I tried to use my current DVB-T dongle and the raspi, as a first project. After a succesful compilation of rtl_fm (I can elaborate, if needed), I'm currently facing various issues for a "complete" FM ...
by Efcis
Sun Jan 08, 2012 1:14 pm
Forum: General discussion
Topic: Audio options...
Replies: 14
Views: 4893

Re: Audio options...

<t>Hi Gert et al.<br/> <br/> Gert said :<br/> <br/> I have been thinking of making a follow up of the Gertboard which has only two devices: Real time Clock and Audio codec.<br/> <br/> For the CODEC, please consider using a device with a large sampling rate capability (eg. TLV320AIC3104 - or even bet...
by Efcis
Fri Sep 23, 2011 9:16 am
Forum: Other projects
Topic: Emulating a RasPi on Windows
Replies: 59
Views: 27241

Re: Emulating a RasPi on Windows

Thanks Eduardo

ARM emulation image torrent download in progress, despite the low count of sources though (the complete file isn't even available right now).
by Efcis
Wed Sep 21, 2011 10:06 pm
Forum: Other projects
Topic: Emulating a RasPi on Windows
Replies: 59
Views: 27241

Re: Emulating a RasPi on Windows

<t>Hi Eduardo !<br/> <br/> Thanks for your great work, and your blog post, which is very educational !<br/> <br/> Just a question : How much total space is required on the disk to install the "full package" (QEMU + ARM emulation image) ? I'm a bit short on space here, and I'd like to get this inform...

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