[Discuss-gnuradio] Re: Fft scope frequent hangs
When you say C++, do you mean wxWidgets ? That's what I was thinking. Write a simple, fast plot widget for wxWidgets, then built the appropriate wxPython wrapper for it. No autoscaling. Just pass a transform matrix and the array of samples. I actually started working on a wxwidget hoping to accomplish this. Here is a link to what I have so far, plus a little backgorund info. Feel free to use as you please. I will probably not have the time to complete this as it should be done, but so far I have at least the wxwidget canvas and grid, a blit function for the grid, the transform matrixes, which can be called from the canvas, a drawline primitive for either splines or staight lines and some simple functionality. See the following page for more info: http://www.jenningsplanet.com/wiki/index.php?title=WxWidget_Plotting ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Re: Help with Verilog: write_count
Message: 1 Date: Fri, 17 Nov 2006 09:14:28 -0800 From: Eric Blossom Subject: Re: [Discuss-gnuradio] Re: Help with verilog: write_count To: seph 004 Cc: discuss-gnuradio@gnu.org Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=us-ascii On Fri, Nov 17, 2006 at 01:02:31AM -0800, seph 004 wrote: > Hi > > Thanks for responding. So WR & ~write_count[8] should be able to > serve as a write enable for a ram block? > Also, while testing with one of the unmodified FPGA builds, I found > that the have_space control line would sometimes go to zero even > though I am only sending small amounts of data (60 bytes for > instance). In the original build, have_space would only go to zero > temporarily if the FIFO became full. So why then does this happen > even when sending small numbers of samples? Shouldn't the 4k FIFO > never become full under those circumstances? Using the standard host code, there's no such thing as sending 60 bytes from the host. We always send 512 byte packets across the USB. Not sure what you are doing... Eric Hi I changed the host code by removing the multiplier for the "max bytes" argument. I assumed that this would let me send the exact number of bytes that the user entered. For my final application, I'm only looking to store a very small number of samples on the FPGA. If this was the wrong modification to the host code, then how exactly would one go about sending a small number of samples (say 400 I and Q samples) without breaking the code? Regards Lance - Sponsored Link Mortgage rates near 39yr lows. $510,000 Mortgage for $1,698/mo - Calculate new house payment___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] gr.firdes.band_reject()
G'day, I have a problem using the above function. My assumption is that band_reject means the rejection of a portion of a spectrum as used in notch filters. The following filter design does not show up the expected notch in the spectrum. To the contrary, the spectrum shows a slight increase of the noise contents at 1000Hz. sample_rate = 48000 frequency = 1000 bandwidth = 100 coeffs = gr.firdes.band_reject( 1.0, sample_rate, frequency - (bandwidth/2), frequency + (bandwidth/2), 50, gr.firdes.WIN_HANN) filter = gr.fir_filter_fcc(1, coeffs) The band/low/high pass filters work as expected. I use gr.noise_source and fft_sink to verify the design. What am I doing wrong? cheerio Berndt ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] PS3/Cell BE platform
We'd have to compile the blocks for the SPE's. Hopefully the compiler does a decent job of extracting parallelism from the code without too much help. Of course we could hand tune the filter kernels like we do today. The scheduler and behind-the-scenes block interconnect/buffering would need to be modified, but that's pretty well abstracted away from the user's view of the world. We'd need to build some tools that would allow us to measure performance on the SPE and allow us to do feedback based assignment of subsets of blocks in a graph to the SPEs. I think this would be an iterative process. That is, partition the graph across the SPEs. Run your test case. Measure. Repeat. Sounds like fun. And yes, I think we could get the HDTV receiver running in real time ;) Eric I am looking to build a new computer (or buy) for graduate school and I would like my platform to be able to have real-time image-processing capabilities. Do you know of any other platforms where that is possible right now? Also, what do you think of the possibility of developing another peripheal that would act like a Cell BE board that would be used in conjunction with the USRP? Newell _ View Athletes Collections with Live Search http://sportmaps.live.com/index.html?source=hmemailtaglinenov06&FORM=MGAC01 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] PS3/Cell BE platform
Newell, You might take a look at http://www.gpgpu.org/ From their web site: > GPGPU stands for General-Purpose computation on GPUs. With the increasing programmability of commodity graphics processing units (GPUs), these chips are capable of performing more than the specific graphics computations for which they were designed. They are now capable coprocessors, and their high speed makes them useful for a variety of applications. The goal of this page is to catalog the current and historical use of GPUs for general-purpose computation. There's a fairly large amount of activity going on in this area, and there's some open source code to look at, e.g., http://sourceforge.net/projects/gpgpu/ At a minimum, you'd think the GPU on a PC graphics card could serve as a "smart sink" capable of doing its own histograms, FFT's, waterfalls, etc. for display purposes. Maybe more... Steve On Nov 19, 2006, at 5:19 PM, Newell Jensen wrote: We'd have to compile the blocks for the SPE's. Hopefully the compiler does a decent job of extracting parallelism from the code without too much help. Of course we could hand tune the filter kernels like we do today. The scheduler and behind-the-scenes block interconnect/buffering would need to be modified, but that's pretty well abstracted away from the user's view of the world. We'd need to build some tools that would allow us to measure performance on the SPE and allow us to do feedback based assignment of subsets of blocks in a graph to the SPEs. I think this would be an iterative process. That is, partition the graph across the SPEs. Run your test case. Measure. Repeat. Sounds like fun. And yes, I think we could get the HDTV receiver running in real time ;) Eric I am looking to build a new computer (or buy) for graduate school and I would like my platform to be able to have real-time image-processing capabilities. Do you know of any other platforms where that is possible right now? Also, what do you think of the possibility of developing another peripheal that would act like a Cell BE board that would be used in conjunction with the USRP? Newell _ View Athletes Collections with Live Search http://sportmaps.live.com/index.html? source=hmemailtaglinenov06&FORM=MGAC01 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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Re: [Discuss-gnuradio] Re: Fft scope frequent hangs
On Sun, Nov 19, 2006 at 03:26:14PM +0100, Josh Jennings wrote: > > >That's what I was thinking. Write a simple, fast plot widget for > >wxWidgets, then built the appropriate wxPython wrapper for it. > >No autoscaling. Just pass a transform matrix and the array of > >samples. > > I actually started working on a wxwidget hoping to accomplish this. > Here is a link to what I have so far, plus a little backgorund info. > Feel free to use as you please. I will probably not have the time to > complete this as it should be done, but so far I have at least the > wxwidget canvas and grid, a blit function for the grid, the transform > matrixes, which can be called from the canvas, a drawline primitive > for either splines or staight lines and some simple functionality. See > the following page for more info: > > http://www.jenningsplanet.com/wiki/index.php?title=WxWidget_Plotting That's great! Keep us posted! Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
