[Discuss-gnuradio] Cannot Run TX Flowgraph More Than One time
Hi, I thing there is a bug (defect) in gnuradio core. Checked with svn revisions 7311 and 9036, on CoreDue system with Ubuntu 8.04, and USRP + RFX900, it seems that we cannot run TX flow graph properly more than one time. If we started it more than one time, we will have a very distorted TX signal (observed on spectrum analyzer). The following python code was used to check this strange behaviour: * #!/usr/bin/env python from gnuradio import usrp from gnuradio import gr import time tb = gr.top_block() tb.u = usrp.sink_s(0) tb.u.set_interp_rate(512) tb.src = gr.noise_source_s(gr.GR_UNIFORM,1,0) tb.subdev= usrp.selected_subdev(tb.u,(1,0)) tb.u.tune(tb.subdev._which,tb.subdev,91500) tb.subdev.set_enable(1) tb.subdev.set_auto_tr(False) tb.u.set_mux(usrp.determine_tx_mux_value(tb.u, (1,0))) tb.connect(tb.src,tb.u) i = 1 while i 4: print running = ,i tb.start() time.sleep(5) tb.stop() tb.wait() time.sleep(1) i +=1 * Regards, Firas -- View this message in context: http://www.nabble.com/Cannot-Run-TX-Flowgraph-More-Than-One-time-tp18776491p18776491.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Beagleboard
Hello, There was some interest on this list earlier about the Beagleboard, a small OMAP3 based board. I just got one from Digi-key and it is small! http://beagleboard.org/ Besides the GNURadio aspects this may be a good board for ham radio digital modem applications like the old TI DSP Evaluation Board that TAPR used. 73 Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] M Blocks Help
Hello all, where can I find documentation on mblocks. how can i get some example codes to learn to exploit a few features of mblocks. I'm trying to send control messages between USRPs carrying some desired information like frequency. Where can i learn about features of M blocks and tested examples.. Thank you SR ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Beagleboard
On Fri, Aug 1, 2008 at 12:04 PM, Eric Cottrell [EMAIL PROTECTED] wrote: Hello, There was some interest on this list earlier about the Beagleboard, a small OMAP3 based board. I just got one from Digi-key and it is small! http://beagleboard.org/ Besides the GNURadio aspects this may be a good board for ham radio digital modem applications like the old TI DSP Evaluation Board that TAPR used. We have built gnu radio for the beagle board and simple stuff (dial tone) does work (for some sw builds). My list of gnu radio + beagle things to do: 1) Get ASoC sound working. 2) Work out USB sound configuration until 1. 3) Need to use libusb-0.1x. USRP transfer speed test works, but kernel dumps when closing usb interface. 4) figure out how to run make check. Currently, individual tests run with manual intervention. 5) Develop and test a NEON filter implementation. Installing GNU Radio, install the Angstrom images, type opkg install gnuradio :) If you have any questions I am on irc.freenode.net in #beagle and #gnuradio. Philip ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Cannot Run TX Flowgraph More Than One time
Mason wrote: What kind of distortion is it? Also, does it exist for lower interp_rates or just 512? (I ask because the rectangular QAM constellation bending seemed to go away by switching to a *faster* tx rate for me.) Mason Hi, For interpolation rate of 512, I should get a signal with say 250KHz spectrum wide. But actually, I got 32MHz wide, unknown (noisy) spectrum. This phenomena, appears for all interpolation rates. Firas ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Beagleboard
On Aug 1, 2008, at 10:40 AM, Philip Balister wrote: On Fri, Aug 1, 2008 at 12:04 PM, Eric Cottrell [EMAIL PROTECTED] wrote: Hello, There was some interest on this list earlier about the Beagleboard, a small OMAP3 based board. I just got one from Digi-key and it is small! http://beagleboard.org/ Besides the GNURadio aspects this may be a good board for ham radio digital modem applications like the old TI DSP Evaluation Board that TAPR used. We have built gnu radio for the beagle board and simple stuff (dial tone) does work (for some sw builds). My list of gnu radio + beagle things to do: 1) Get ASoC sound working. 2) Work out USB sound configuration until 1. 3) Need to use libusb-0.1x. USRP transfer speed test works, but kernel dumps when closing usb interface. 4) figure out how to run make check. Currently, individual tests run with manual intervention. 5) Develop and test a NEON filter implementation. Installing GNU Radio, install the Angstrom images, type opkg install gnuradio :) If you have any questions I am on irc.freenode.net in #beagle and #gnuradio. That's great. The next thing I'd like to see is someone using the Beagle expansion port for a higher bandwidth RF interface. Something to get the data rate up beyond the ~30MB/s that the current USRP supports. Seems do-able, but would require some new driver and hardware development. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Beagleboard
On Fri, Aug 1, 2008 at 3:18 PM, Eric Brombaugh [EMAIL PROTECTED] wrote: On Aug 1, 2008, at 10:40 AM, Philip Balister wrote: On Fri, Aug 1, 2008 at 12:04 PM, Eric Cottrell [EMAIL PROTECTED] wrote: Hello, There was some interest on this list earlier about the Beagleboard, a small OMAP3 based board. I just got one from Digi-key and it is small! http://beagleboard.org/ Besides the GNURadio aspects this may be a good board for ham radio digital modem applications like the old TI DSP Evaluation Board that TAPR used. We have built gnu radio for the beagle board and simple stuff (dial tone) does work (for some sw builds). My list of gnu radio + beagle things to do: 1) Get ASoC sound working. 2) Work out USB sound configuration until 1. 3) Need to use libusb-0.1x. USRP transfer speed test works, but kernel dumps when closing usb interface. 4) figure out how to run make check. Currently, individual tests run with manual intervention. 5) Develop and test a NEON filter implementation. Installing GNU Radio, install the Angstrom images, type opkg install gnuradio :) If you have any questions I am on irc.freenode.net in #beagle and #gnuradio. That's great. The next thing I'd like to see is someone using the Beagle expansion port for a higher bandwidth RF interface. Something to get the data rate up beyond the ~30MB/s that the current USRP supports. Seems do-able, but would require some new driver and hardware development. I've been talking to a friend (he knows FPGA stuff much better than me) about using the expansion port to communicate with an FPGA via a SDIO interface. I don't think we can beat the current USRP data rate, but we should be able to reduce the latency introduced by the USB interface. Philip ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Beagleboard
On Aug 1, 2008, at 1:58 PM, Philip Balister wrote: I've been talking to a friend (he knows FPGA stuff much better than me) about using the expansion port to communicate with an FPGA via a SDIO interface. I don't think we can beat the current USRP data rate, but we should be able to reduce the latency introduced by the USB interface. Looks like the SDIO ports run up to 50MHz and have 8-bit wide data. No idea how much overhead there is in that, but it might be able to go a bit faster than USB2.0 and as you note would have a lot less latency. Hook up to a decent FPGA and you could cram a bit of external pre- processing in as well. I picked up one of the Avnet Xilinx Spartan 3A boards for $50 that would probably work well for that. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
