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Re: [Discuss-gnuradio] [Douglas Geiger BBN 802.11b] Porting code on USR

From: Colby Boyer
Subject: Re: [Discuss-gnuradio] [Douglas Geiger BBN 802.11b] Porting code on USRP2 problems
Date: Fri, 17 Apr 2009 12:51:15 -0700

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?



On Fri, Apr 17, 2009 at 10:53 AM, Colby Boyer <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.


On Fri, Apr 17, 2009 at 10:15 AM, Colby Boyer <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.


2009/4/17 Ben Yahmed <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>>

   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,

   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>> 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
   > > 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,
   > >
   > > 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
   > >
   > >> / 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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