Hello list,
I have recently changed the USRP clock with an external PLL. Then I used
the previously precompiled standard firmware std_4rx_0tx.rbf , using 2
sinusoidal inputs to RXA, RXB and it was confirmed that everything was
working fine. I then downloaded the 3.0.4 version and tried to recompile
the usrp_std project. I used the usrp_std.rbf file produced in the
rx_cfile.py, feeding the RXA, RXB each with a sinusoidal signal and when
I plotted the output I found out that I was getting 0s and -1s only, as
if I was getting clock pulses.
I then used again the std_4rx_0tx.rbf file which resulted in the
expected output (sinusoidal signals at the same frequency) with
amplitudes ranging from -15500 to 15500. .
I then used another firmware which actually produces known data from
within the rx_buffer.v file, (a signal that cycles from 0 to 15 and back
to 0) and the output was as expected again, linear increase from 0 to 15
and then back to 0.
I then tried other versions of the firmware that there were working, as
Peter Monta's variable width and shift firmware, but again I was getting
values almost down to 0.
Does anyone has an idea what might be wrong? Why do some .rbfs working
and some not?
Thank you
Rigas
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