Hi Ron, Success! I reinstalled UHD using your NEON optimization flags, and it went without a hitch.
I also got to the bottom of my other Python API problem — it turns out I forgot to run the Udev setup for USB. I can now connect to the B210 with my Raspberry Pi via either the C++ or Python APIs, without needing to use “sudo” for everything. Brendan. On Tue, Apr 6, 2021 at 10:53 PM Ron Economos <w...@comcast.net> wrote: > Awesome. When you get everything sorted out and you're feeling > adventurous, you can add NEON optimization. In the cmake step, replace: > > -DNEON_SIMD_ENABLE=OFF > > with: > > -DCMAKE_CXX_FLAGS:STRING="-march=armv7-a -mfloat-abi=hard -mfpu=neon > -mtune=cortex-a72" -DCMAKE_C_FLAGS:STRING="-march=armv7-a -mfloat-abi=hard > -mfpu=neon -mtune=cortex-a72" -DCMAKE_ASM_FLAGS:STRING="-march=armv7-a > -mfloat-abi=hard -mfpu=neon -mtune=cortex-a72 -g" > > Ron > On 4/6/21 05:15, Brendan Horsfield wrote: > > Thanks for the tip Ron! It got me (almost) all the way home. > > I can now interface with the USRP via the C++ API, which I couldn't do > previously. > > Unfortunately there's still a niggling problem with the Python API (a > different one than before), but I will start a new thread to cover that > issue. > > Cheers, > Brendan. > > > On Sun, Apr 4, 2021 at 11:53 AM Ron Economos <w...@comcast.net> wrote: > >> This is just a guess, but you could try: >> >> -DCMAKE_SHARED_LINKER_FLAGS="-latomic" >> >> in addition. >> >> Ron >> On 4/3/21 18:34, Brendan Horsfield wrote: >> >> Thanks Ken. As you suggested, I added >> -DCMAKE_EXE_LINKER_FLAGS="-latomic" to the CMake call. >> >> The good news is that the UHD build & installation process completed >> successfully. >> >> The bad news is that when I try to import the uhd module in Python3, I >> get the following error: >> >> pi@raspberrypi:~ $ python3 >> Python 3.7.3 (default, Jan 22 2021, 20:04:44) >> [GCC 8.3.0] on linux >> Type "help", "copyright", "credits" or "license" for more information. >> >>> import uhd >> Traceback (most recent call last): >> File "<stdin>", line 1, in <module> >> File "/usr/local/lib/python3/dist-packages/uhd/__init__.py", line 10, >> in <module> >> from . import types >> File "/usr/local/lib/python3/dist-packages/uhd/types.py", line 10, in >> <module> >> from . import libpyuhd as lib >> ImportError: /usr/local/lib/libuhd.so.4.0.0: undefined symbol: >> __atomic_fetch_add_8 >> >>> >> >> Did you encounter this problem too? >> >> I guess the next step is to hack the "CMakeLists.txt" files as per the >> link you sent me. Just to clarify one point first: If I modify the >> CMakeLists.txt files, do I still need to include >> -DCMAKE_EXE_LINKER_FLAGS="-latomic" in the CMake call? >> >> Thanks, >> Brendan. >> >> >> >> On Sat, Apr 3, 2021 at 10:29 PM Clark (US), Kenneth C < >> kenneth.c.cla...@boeing.com> wrote: >> >>> >>> I had the same problem build UHD on RPi4 >>> >>> Answer here: >>> https://gitlab.kitware.com/cmake/cmake/-/issues/21174 >>> >>> Add to CMake call: >>> -DCMAKE_EXE_LINKER_FLAGS="-latomic" >>> >>> Regards, >>> >>> Ken >>> >>> >>> _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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