Issue trying to make for armv8 platform about rtlsdr-airband HOT 14 CLOSED

FFTW3 library is needed in this case

sudo apt-get install libfftw3-dev

from rtlsdr-airband.

You can install libfftw3-dev and compile with armv8-generic, however it will not use GPU for FFT and the performance will probably be mediocre.

Instead, pull this branch: https://github.com/szpajder/RTLSDR-Airband/tree/rpiv3 . Compile with PLATFORM=rpiv3 make and let me know if it works (ie. if it does not hang the Pi and the CPU usage is reasonable, not near 100%).

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@mollerdaniel

Thanks, I should have looked deeper. I am just a noob at this Linux/Raspbian stuff.

from rtlsdr-airband.

You can install libfftw3-dev and compile with armv8-generic, however it will not use GPU for FFT and the performance will probably be mediocre.

Instead, pull this branch: https://github.com/szpajder/RTLSDR-Airband/tree/rpiv3 . Compile with PLATFORM=rpiv3 make and let me know if it works (ie. if it does not hang the Pi and the CPU usage is reasonable, not near 100%).

@szpajder

Thanks, wow you are fast creating branches. I tried it and it seems to work fine without the issues you wanted a report on. Attached is my screenshot from htop while running the rpiv3 compile.

FYI: I am running a RPi3 with Jessie without overclocking. I have 3ea of these dongles with this USB HUB and I am uploading 3 separate streams to LiveATC.

Since I am just learning, can you explain what benefit there would be to compiling as rpiv3 vs rpiv2?

from rtlsdr-airband.

from rtlsdr-airband.

I'm currently running PLATFORM=rpiv3 from the rpiv3 branch on a RPi3, no issues at all so far.
CPU usage is the same, but worth mentioning is that I only have a simple scan-setup so far.

from rtlsdr-airband.

@szpajder

Sorry for the confusion. Yes I was able to compile and have been using the RPi3 with PLAFORM=rpiv2 for some time now. That worked just fine.

I was as you said just wanting to check out the new armv8=generic build. I had no idea about what the differences were. Thanks for the explanation. Makes sense to me.

I have been running on PLATFORM=rpiv3 for about 12 hours now with no negative issues I can see. Performance seems to be good. I do see some differences in how the CPU cores are being used in HTOP.

from rtlsdr-airband.

Thanks everybody for the feedback. However, if the program runs OK on Pi 3 when compiled with PLATFORM=rpiv2, then I would prefer not to add PLATFORM=rpiv3 to the mainline, because it makes the build process even more confusing for the user. I'd rather switch to some automated build configuration (like autotools or cmake) instead of further extending the clutter we have now...

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Automated sounds like a good idea.
And I must say you are doing one heck of a great job on RTLSDR-Airband @szpajder!
It is very much appreciated! Thank you!

from rtlsdr-airband.

I agree! Great job! Automated sounds great!

from rtlsdr-airband.

Hi, thanks for the interesting sw.

I have installed main release on an Rpi3, but trying to configure using

PLATFORM=rpiv2 make

results in :

compilation terminated.
: recipe for target 'gpu_fft_base.o' failed
make[1]: *** [gpu_fft_base.o] Error 1
make[1]: Leaving directory '/root/RTLSDR-Airband/hello_fft'
makefile:84: recipe for target 'hello_fft' failed
make: *** [hello_fft] Error 2

Also tried armV8-generic (after installing libfftw3-dev)

PLATFORM=armv8-generic make
g++ rtl_airband.o output.o config.o util.o mixer.o -lrt -lm -lvorbisenc -lmp3lame -lshout -lpthread -lrtlsdr -lconfig++ -lfftw3f -o rtl_airband
rtl_airband.o: In function demodulate()': /root/RTLSDR-Airband/rtl_airband.cpp:319: undefined reference to mbox_open()'
/root/RTLSDR-Airband/rtl_airband.cpp:321: undefined reference to gpu_fft_prepare(int, int, int, int, GPU_FFT**)' /root/RTLSDR-Airband/rtl_airband.cpp:399: undefined reference to samplefft'
/root/RTLSDR-Airband/rtl_airband.cpp:418: undefined reference to gpu_fft_execute(GPU_FFT*)' /root/RTLSDR-Airband/rtl_airband.cpp:367: undefined reference to gpu_fft_release(GPU_FFT*)'
collect2: error: ld returned 1 exit status
: recipe for target 'rtl_airband' failed
make: *** [rtl_airband] Error 1

from rtlsdr-airband.

I'm probably missing something simple....

Same problem with rpiv3 branch:

~/RTLSDR-Airband# PLATFORM=rpiv3 make
g++ -O3 -g -Wall -DSYSCONFDIR="/usr/local/etc" -DDEBUG=0 -DUSE_BCM_VC -I/opt/vc/include -I/opt/vc/include/interface/vcos/pthreads -I/opt/vc/include/interface/vmcs_host/linux -march=armv8-a+crc -mtune=cortex-a53 -ffast-math -c -o rtl_airband.o rtl_airband.cpp
make -C hello_fft
make[1]: Entering directory '/root/RTLSDR-Airband/hello_fft'
g++ -O3 -g -Wall -DSYSCONFDIR="/usr/local/etc" -DDEBUG=0 -DUSE_BCM_VC -I/opt/vc/include -I/opt/vc/include/interface/vcos/pthreads -I/opt/vc/include/interface/vmcs_host/linux -march=armv8-a+crc -mtune=cortex-a53 -ffast-math -I.. -c -o gpu_fft_base.o gpu_fft_base.c
gpu_fft_base.c:29:22: fatal error: bcm_host.h: No such file or directory
#include "bcm_host.h"
^
compilation terminated.
: recipe for target 'gpu_fft_base.o' failed
make[1]: *** [gpu_fft_base.o] Error 1
make[1]: Leaving directory '/root/RTLSDR-Airband/hello_fft'
makefile:92: recipe for target 'hello_fft' failed
make: *** [hello_fft] Error 2

from rtlsdr-airband.

The key information is here:

gpu_fft_base.c:29:22: fatal error: bcm_host.h: No such file or directory

Most probably the /opt/vc/include directory and files are missing. Are you running Raspbian? If yes, then run sudo rpi-update and it should get installed. Then reboot and try again with the rpiv2 or rpiv3 build.

PLATFORM=armv8-generic build will succeed on the Pi3, however each time you decide to switch to another PLATFORM value, you have to delete files produced by the previous build by running make clean. Then try again.

from rtlsdr-airband.

Great, "make clean" solved the issue of re-compiling with armv8-generic, thanks for the tip.

I use DietPi, a lean distribution of Debian, and there is no rpi-update. I tried apt-get update but didn't help.

Googling indicated that the bcm_host file belongs to libraspberrypi-dev or raspberrypi-kernel-headers, so I installed those packages and then it found the file.

It does throw these warnings but maybe works as intended anyway?

gpu_fft_base.c: In function ‘unsigned int gpu_fft_base_exec_direct(GPU_FFT_BASE*, int)’:
gpu_fft_base.c:65:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (q=0; q<num_qpus; q++) { // Launch shader(s)
^
gpu_fft_base.c:72:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if (((base->peri[V3D_SRQCS]>>16) & 0xff) == num_qpus) break; // All done?
^
gpu_fft_base.c:54:17: warning: unused variable ‘t’ [-Wunused-variable]
unsigned q, t;
^

Anyway, I suggest adding the "make clean" tip to the instruction and maybe mention
libraspberrypi-dev
raspberrypi-kernel-headers
dependency for those that don't use Raspbian.

from rtlsdr-airband.