Just to report the solution, as it me be usefull for others.
My block was an hier2 block. Hier2 blocks can't handle messages
directly, they only can serve as a proxy.
So I added a gr::block with no inputs and outputs ( yes, this is
possible, I did not know before ) that could handle the message.
From my hier2 block I routed the message to my new block and everything
works fine.
The details can be seen on github
https://github.com/dl1ksv/gr-fcdproplus/tree/gnuradio3.8
Many thanks to MLD, who pointed me into the right direction.
-- Volker
Am 20.07.2018 um 12:28 schrieb Volker Schroer:
Hi,
I'm trying to add an message port to my working oot module fcdproplus
to be able to control the frequency by an message from a qtgui sink.
I used the analog signal source as guide and implemented a message sink
in the grc description, registered the in port, and defined a handler
function like described in the tutorial.
I can run my example of a simple fm receiver as before, but when I
connect the message out port of a qtgui sink to my message in port of my
oot block,
I get the following error message:
./FMRadio.py
INFO: Audio source arch: alsa
Funcube Dongle Pro+ found as: plughw:3,0
Dongle sucessfully initialized
Result of Action :+
FCDAPP 20.03
Lna gain enabled
Mixer gain enabled
If gain set to: 10
Set Frequency to: 94.3 KHz, corrected to: 94300 Khz
INFO: Audio sink arch: alsa
Traceback (most recent call last):
File "./FMRadio.py", line 277, in
main()
File "./FMRadio.py", line 266, in main
tb.start()
File
"/usr/local/gnuradio/lib64/python2.7/site-packages/gnuradio/gr/top_block.py",
line 109, in start
top_block_start_unlocked(self._impl, max_noutput_items)
File
"/usr/local/gnuradio/lib64/python2.7/site-packages/gnuradio/gr/runtime_swig.py",
line 5678, in top_block_start_unlocked
return _runtime_swig.top_block_start_unlocked(r, max_noutput_items)
RuntimeError: fcdproplus(3): insufficient connected output ports (1
needed, 0 connected)
These are the connections:
##
# Connections
##
self.msg_connect((self.qtgui_sink_x_0, 'freq'),
(self.fcdproplus_fcdproplus_0, 'freq'))
self.connect((self.analog_fm_demod_cf_0, 0),
(self.audio_sink_0, 0))
self.connect((self.analog_fm_demod_cf_0, 0),
(self.audio_sink_0, 1))
self.connect((self.fcdproplus_fcdproplus_0, 0),
(self.low_pass_filter_0, 0))
self.connect((self.fcdproplus_fcdproplus_0, 0),
(self.qtgui_sink_x_0, 0))
self.connect((self.low_pass_filter_0, 0),
(self.analog_fm_demod_cf_0, 0))
If I remove the line
self.msg_connect((self.qtgui_sink_x_0, 'freq'),
(self.fcdproplus_fcdproplus_0, 'freq'))
from my python script he error message disappears.
What am I doing wrong?
Any help is appreciated.
-- Volker
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