Hi Vikas So the script will get values the first time, then get only zeros for a few times, then get values, then back to zeros etc...?
The script works fine for a 128 channel spectrometer but not for 256 channels? The best way to debug the problem would be to insert lines of code in your script that allow you to trace what is happening. Print out the values you read back from registers, and the decisions you make based on those values. Output the time at which things happen so that you can see if it makes sense. This output will also help others help you as we have more information to work with. You might also want to zip up the .mdl file and python script and post this with your question. Regards Andrew On Sat, 2011-11-19 at 13:48 -0700, Vikas Asthana wrote: > Hi Andrew, > > > I tried this, but this doesn't help. It will show the data on first > run, but then all zeros only. > Is there something else I could try ? > Is this related to fault in design file or python script? > Thanks. > > > -Vikas. > > On Mon, Sep 26, 2011 at 2:18 AM, Andrew Martens > <[email protected]> wrote: > Hi Vikas > > Does the code read back all zeros consistently after FPGA > configuration? Your problem may be related to the thread > below; > > http://www.mail-archive.com/[email protected]/msg01938.html > > Regards > Andrew > > > On 24 September 2011 01:48, Vikas Asthana > <[email protected]> wrote: > Hi Glenn, > > The command completes without showing any error and > also shows a plot but the values are all zeros. Except > for the case when it shows up. > Do you have related problem before? > In simulation, all seems fine, but to check it again, > I am going to compile the design with known inputs > instead of using x64_adc for the inputs. > Thanks. > > -Vikas. > > > > On Fri, Sep 23, 2011 at 5:40 PM, G Jones > <[email protected]> wrote: > Hi, > What exactly is happening when the command > does not work? Is the read not completing or > does the data not look correct? What does > happen? > Glenn > > > > On Fri, Sep 23, 2011 at 3:41 PM, Vikas Asthana > <[email protected]> wrote: > Hi, > > We have a spectrometer giving out 256 > FFT channels. But I am having a bit > problem in reading out the brams using > ipython. > I am trying to just read the bram once > and see the bram values on a plot. The > command I am using for reading the 32 > bit values stored at each address in > BRAM (size = 2048) is : > > > f = > > np.fromstring(u.read(bram,1024*4),dtype='int32').byteswap() > plt.figure(aa);plt.plot(f/(2.0**5)); > > > But this will show the data in the > BRAM every once in a while (1 in 10), > the same script works fine for the > same design giving out 128 FFT > channels. > Has anyone encountered this problem > before? I have attached the python > script to look at. > Can anyone tell what could be the > problem - is it in the script or in > the design? > Thanks for the help. > > > > > -- > Vikas Asthana > Research Assistant, > Radio Astronomy Systems Research > Group, > Brigham Young University, > 480, Clyde building, > Provo, UT, USA - 84602. > Email: [email protected] > > > > > > > > > > > > > > >
