Re: [Discuss-gnuradio] RTTY receiver

[barry]

Hi Kyeong,

1) In lib/radioteletype/baudot_encode_bb.h I tried replacing "static 
const char" with "static const signed char", but it caused complications 
in radioteletype/baudot_encode_bb.cc, so I took an alternate approach:
/*
 * modified by Barry Duggan KV4FV
 * 11 June 2019
 * with RaspberryPi compiler, an error is produced comparing char and 
signed char values.
 * to circumvent this problem, I have changed all "-1" entries to "0x7f" 
in the table
 * and in the code
 */
So now the 'make' works without errors.

2) In 'sudo make install' I got the following:
-- Installing: 
/usr/local/lib/python2.7/dist-packages/radioteletype/_radioteletype_swig.so
-- Set runtime path of 
"/usr/local/lib/python2.7/dist-packages/radioteletype/_radioteletype_swig.so" 
to ""
which leads to a run-time error...
Traceback (most recent call last):
  File "/home/pi/gr-radioteletype/examples/rtty_demod.py", line 30, in 
<module>
    from radioteletype.demodulators import rtty_demod_cb
  File 
"/usr/local/lib/python2.7/dist-packages/radioteletype/demodulators.py", 
line 9, in <module>
    from radioteletype_swig import (
  File 
"/usr/local/lib/python2.7/dist-packages/radioteletype/radioteletype_swig.py", 
line 21, in <module>
    _radioteletype_swig = swig_import_helper()
  File 
"/usr/local/lib/python2.7/dist-packages/radioteletype/radioteletype_swig.py", 
line 20, in swig_import_helper
    return importlib.import_module('_radioteletype_swig')
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in 
import_module
    __import__(name)
ImportError: No module named _radioteletype_swig

So, where should '_radioteletype_swig.so' go, and how do I specify it?

3) When I loaded 'examples/rtty_demod.grc', there was a missing block 
'pulseaudio_pa_sink'. Where is it, and what does it do? Since it didn't 
seem directly required for the rest of the example to work, I deleted it 
and the two blocks feeding it.

4) I really appreciate all that you and the others are doing to help 
with this.

Many thanks, Barry

On 2019-06-11 00:05, Kyeong Su Shin wrote:
> Hello Barry,
>
>
> Apparantly, the module has portability issues (will build on x86 but
> won't build on ARM) due to data type issues. To build the package, you
> will have to edit lib/baudot_encode_bb_impl.h:
>
>
> "static const char ascii_to_letters[128]" should become
>
>
> "static const signed char ascii_to_letters[128]",  and
>
>
> "static const char ascii_to_figures[128]" should become
>
>
> "static const signed char ascii_to_figures[128]".
>
> That will allow the module to build, although you may have to make
> further changes to get "Boudot Encode" block working correctly (I
> didn't test that; maybe I should make a pull request after that).
>
>
> Regards,
>
> Kyeong Su Shin
>
>
> ________________________________

<snip>