Re: [Discuss-gnuradio] USRP1 FPGA modification problem.

[Matt Ettus]

Tiago,

It is very hard to help you.  You are basically saying "we did something
different and it doesn't work."  You haven't posted code, you're using
an old version of GNU Radio, and not using the latest drivers (UHD).
This all makes it hard to help you.

If the FPGA is asserting have_pkt_rdy, the FX2 is not setting RD and OE,
and you haven't changed the code running in theFX2, then it is likely
that your app on the host has died or closed.

Matt



On 06/14/2011 11:52 AM, Tiago Rogério Mück wrote:
> Hi,
> 
> Have anyone taken a look at this ?
> 
> We are still struggling to find a solution to this problem. Any tip
> would help a lot.
> 
> Thanks,
> Tiago
> 
> 
> Em 27 de maio de 2011 16:51, Tiago Rogério Mück <address@hidden
> <mailto:address@hidden>> escreveu:
> 
>     Hi,
> 
>     We have been working with an (old) USRP1 and doing some
>     modifications in the FPGA code. After our modifications (we added an
>     extra layer of DDCs to perform channel separation in the FPGA), the
>     things didn't work as expected.
> 
>     In some Gnuradio applications the USRP stops sending samples after
>     some time. For example, usrp_fft.py runs just fine all the time, but
>     usrp_rx_cfile.py and usrp_wfm_rcv.py work for some secs and then the
>     USRP stops sending samples.
> 
>     I added some pics of our preliminary debugging. In the figures, the
>     yellow, blue and red signals refer to the have_pkt_rdy, RD and OE
>     signals, respectively. After some time, the Cypress stops setting RD
>     and OE signals in response to the assertion of have_pkt_rdy (first
>     figure). Latter, the USB FIFO in the FPGA overflows and then
>     have_pkt_rdy goes down (figure 2). So it seems the problem is not
>     with our modifications in the FPGA code but with something related
>     to the Cypress.
> 
>     Have someone ever had a similar problem ? Any clue in how to solve
>     this would help a lot. We are using Gnuradio 3.2.2.
> 
>     The funny thing is that usrp_fft.py works perfectly (we double
>     checked all *.py to make sure our new bitstream is always being
>     loadded and our new DDCs are being properly configured).
> 
>     Thanks.
> 
>     Regards,
>     Tiago.
> 
> 
> 
> 
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