Mohammed,
That's good question and I'm working on a project that requires me to do similar but mine is frequency.
I believe that once a code is run and your receiver is running that changing a variable is not possible.
However I have a workaround, I am using a file as a source which will be either blank (so no action takes place) or a frequency value, this triggers a reset of python and then reads in the value as a variable.
This works quite well in my case but may not suit all applications. My receiver only needs to be on when I trigger it from the transmitter, it can't be used if you're looking for a constant FFT plot.
Hope this helps and if there are any suggestions for a more refined solution that would be great.
Brian
That's good question and I'm working on a project that requires me to do similar but mine is frequency.
I believe that once a code is run and your receiver is running that changing a variable is not possible.
However I have a workaround, I am using a file as a source which will be either blank (so no action takes place) or a frequency value, this triggers a reset of python and then reads in the value as a variable.
This works quite well in my case but may not suit all applications. My receiver only needs to be on when I trigger it from the transmitter, it can't be used if you're looking for a constant FFT plot.
Hope this helps and if there are any suggestions for a more refined solution that would be great.
Brian
From: mohammad nejati
Sent: 12/08/2017 10:51
To: discuss-gnuradio@gnu.org
Subject: [Discuss-gnuradio] Updating variable by passing message
I want to update taps in "FFT FILTER" block in run time , i have a
block that can send this taps as a message every 1 secound . i write
an python block witch get this message what i want to do is get this
message and update value of a variable block wich is used in FFT
FILTER . but i dont know how i can update a variable block value in
python code , is that possible at all ?
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