Hi All,
So I ran a sanity test on the TX and RX functions.
In the tx.py file, I added a file sink to record the data being sent
to the USRP2. In the rx.py file I added a file source to read that
data, rather than reading samples from the USRP2. When I did this, it
was able to successfully demodulate the packets from reading the
sample data from a file. So TX is working(?) unless something is going
wrong with initializing/sending stuff to the hardware.
So perhaps the rx is not correctly reading samples in from the USRP2?
Thoughts?
Colby
On Fri, Apr 17, 2009 at 10:53 AM, Colby Boyer <address@hidden
<mailto:address@hidden>> wrote:
Hi Ben,
I uploaded my files to the usrp2_version in the CGRAN server. It
uses the same files I used to run my USRP2 tests, so it should
interface with the hardware correctly. Let me know if it does not.
Bests,
Colby
On Fri, Apr 17, 2009 at 10:15 AM, Colby Boyer
<address@hidden <mailto:address@hidden>> wrote:
Hi Ben,
Perhaps I haven't updated the CGRAN repo yet. I'll take a look
and try to get back to you within an hour.
Colby
2009/4/17 Ben Yahmed <address@hidden
<mailto:address@hidden>>
I'm trying to modify the bbn_80211b_rx.py code inorder to
receive packets but in every step I'm facing an
AttributeError like:
AttributeError: 'usrp2_source_32fc_sptr' object has no
attribute 'make_format'
AttributeError: 'usrp2_source_32fc_sptr' object has no
attribute 'set_format'
AttributeError: 'module' object has no attribute 'set_gain'
AttributeError: 'gr_hier_block2_sptr' object has no
attribute 'subdev'
It seems that the code has not been switched correctly to
work with usrp2 and still make reference to usrp classes.
Did you try to run the bbn_80211b_rx.py with the usrp2
that you have?
Tiago Rogério Mück wrote:
That's good news.
The code I sent seemed to be working but i realy
didn't tested it. We have only one USRP2 here and we
were trying to receive pkts using a 802.11b PCI card
(Realtek RTL8180L chipset), but without success (some
problems with the card configuration).
2009/4/17 Valerio, Danilo <address@hidden
<mailto:address@hidden> <mailto:address@hidden
<mailto:address@hidden>>>
Hi Colby!
We have also tried without success.
We have used the TX path from Tiago and a modified
version of the
RX path (firmware and FPGA at their latest update).
I also felt confident that the the TX path works,
and consequently
that the RX path had some problem.
So we have tried to transmit with the USRP2 and
receive with a
real IEEE802.11 chipset (Ralink chipset RT2500).
This chipset has no firmware and we modified the
linux driver so
as to:
- avoid mac CRC (Everything received on the MAC
layer is passed to
the higher layers);
- set fixed modulation schemes (i.e. DBPSK 1Mbps);
- set PLCP long preamble.
- set complete monitor/passive mode.
The chipset detects some transmitted frames. This
could be an
indication that the PLCP preamble/header is correct
(?).
However the PLCP payload is just rubbish.
We have also tried to submit stupid payloads (like
ffffffff) and I
have the impression that what we receive is just
random. :-(
If we obtain some successful result in the next few
days, I'll let
you know!
Best Regards,
Danilo
On Friday 17 April 2009 09:17:38 Colby Boyer wrote:
> Hi All,
>
> I've been trying to run some hardware tests
between two USRP2s,
but I have
> had no success in receiving packets. I am using
the modified TX
from Tiago.
> I feel sorta confident that the TX code works,
because when I
run the
> usrp2_fft.py, I see a wave form being transmitted
over the channel.
>
> Has anyone have any success on receiving packets
between two
USRP2s? When
> RX/TX there is a usrp2::ctor reset db failed
error. Could this cause
> problems for the RX/TX? I am using the firmware
that was shipped
with the
> USRP2.
>
> Thanks,
> Colby Boyer
>
> On Wed, Apr 15, 2009 at 10:40 AM, Ben Yahmed <
> address@hidden
<mailto:address@hidden>
<mailto:address@hidden
<mailto:address@hidden>>> wrote:
>
> > Hi all,
> >
> > Since I have tested the tx code
(bbn_80211b_tx_port2.py), I
wanted to run
> > the bbn_80211b_rx.py inorder to capture the
packets sent but I
encountred
> > this error:
> >
> >
> > # ./bbn_80211b_rx.py Traceback (most recent
call last):
> > File "./bbn_80211b_rx.py", line 179, in <module>
> > main ()
> > File "./bbn_80211b_rx.py", line 174, in main
> > app = app_flow_graph()
> >
> > File "./bbn_80211b_rx.py", line 159, in __init__
> > self.u = usrp_rx(0, options.decim,
options.rx_subdev_spec,
> > options.width_16, options.verbose,
options.gain, options.freq)
> > File "./bbn_80211b_rx.py", line 97, in __init__
> >
> > self.u.set_decim(decim_rate=(decim * 1.5))
> > File
"/usr/local/lib/python2.5/site-packages/gnuradio/usrp2.py",
line 499,
> > in set_decim
> > return
_usrp2.usrp2_source_32fc_sptr_set_decim(self, *args,
**kwargs)
> >
> > TypeError: usrp2_source_32fc_sptr_set_decim()
takes exactly 2
arguments (1
> > given)
> >
> > do you have any idea about the origin of this
problem? Thank
you in
> > advance.
> >
> >
> >
> >
> >
> >
> > On Mon, Apr 06, 2009 at 04:29:20PM -0300, Tiago
Rogério Mück
wrote:
> >
> >> / Updated from the trunk and I'm not getting
that msg anymore./
> >> / /
> >> / Everything seems to be ok now./
> >>
> >
> > Glad to hear it! Thanks for letting us know.
> >
> > Eric
> >
> >
>
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