Problem with multiple flow graphs on receive side

GNU Radio
1

Hi,
I am trying to write an application which senses spectrum
(usrp_spectrum_sense.py) and transmits/receives signals. I have the
tx/rx working fine. But when i add another flow graph(3rd one to
existing tx and rx) for the spectrum sense,to the top block, it gives me
an error. I get an error on this line which says “cant open rx
interface” and “device busy”

self._u = usrp.source_c (self._which,
fusb_block_size=self._fusb_block_size,
fusb_nblocks=self._fusb_nblocks)

Is it because of competing receive paths. I thought that we could have
multiple paths.
Could somebody help in this regard.

Sriram

2

Sriram Krishnan-3 wrote:

                            fusb_block_size=self._fusb_block_size,
                            fusb_nblocks=self._fusb_nblocks)

Is it because of competing receive paths. I thought that we could have
multiple paths.
Could somebody help in this regard.

maybe it is because you are already open the rx part and you try to open
it
again for sensing…

Adib

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3

Hi Sriram ,

Did you managed to solve your problem?
I’m doing the same, but i don’t have any errors. The connecting process
is
ok,

but i think there is a conflict between the “call_back” of the receiving
path and the “eval” function of the sensing path? have you faced some
problem like this?

if yes, please inform how did you solve it.

regards,

Sriram Krishnan-3 wrote:

                            fusb_block_size=self._fusb_block_size,

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4

OK,

abbasi9999 wrote:

(usrp_spectrum_sense.py) and transmits/receives signals. I have the
multiple paths.

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