red-pitaya-notes
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pavel-demin
Cant connect GRC on Windows (Radioconda)
Description of the setup:
- Device: 122-16
- SD card image: red-pitaya-alpine-3.14-armv7-20211119
- Application: sdr_transceiver_122_88, GRC
- Other relevant information: Windows, Radioconda GRC build
Description of the problem:
The Red Pitaya Souce block is not able to connect to RP application
Traceback (most recent call last): ..... ..... red_pitaya.py", line 44, in init fd = os.dup(self.data_sock.fileno()) OSError: [Errno 9] Bad file descriptor
Connecting to Alpine (pTTy) works fine. Running PowerSDR with sdr_receiver_hpsdr_122_88 also works fine so the hardware seems OK. Is there some Linux/WIndows incompatibility ?
Steps to reproduce the problem:
- Compile and run trx_am.grc on GRC
Is there some Linux/WIndows incompatibility ?
Yes, the way red_pitaya.py handles sockets and file descriptors is incompatible with Windows.
If you want to use the 122-16 board with GNU Radio on Windows, then I think that the easiest solution is to use the applications compatible with HPSDR and the following GNU Radio block:
https://github.com/Tom-McDermott/gr-hpsdr
Another solution is to use Windows Subsystem for Linux (WSL) to run GNU Radio:
https://wiki.gnuradio.org/index.php/WindowsInstall#WSL_|_Ubuntu
I have just realized that gr-hpsdr also requires Linux.
So, looks like using WSL is the only solution.
I went to native linux (Ubuntu 20.4) and now I got the connection working with GR 3.10.1.1.
A minor issue - there seems to be some incompatabilty in the "template" flowgraphs trx_am and trx_ssb:
The resampler box could not handle float expressions för the Interpolation/Decimation parameters (fixed with int(..) )
In the trx_ssb flowgraph The FFT filter tap description 'firdes' produces an error
' type object 'gnuradio.filter.filter_python.firdes' has no attribute 'WIN_HAMMING'
Looking at the Gnuradio dicussion threads this seems to be version related - will be looking to find a fix to this.