On 09/11/2015 07:56 AM, Chad R wrote:
Good day.
I'm wondering if you can help me. I have a B210 board connected to a
jetson tk1 and I am trying to send over one port and receive over two.
The hardware setup is the RX/TX board connected to an RF filter
connected to a splitter and the connected to the two RX2 ports. When I
run one TX and one RX I have no issues however when I run 2 RX my
python application crashes. I try run a simple 2 Rx configuration in
GNU Radio with the 2 USRP sources connected to 2 Frequency GUI.
However even running at a sampling rate of 64Kbps I am getting an
overflow error. I thought that maybe the jetson tk1 couldn't handle
the bandwidth but running it on my PC I get the same results. The
output is as follows:
Executing: "/home/chad/Tx1_Rx2.py"
linux; GNU C++ version 4.8.2; Boost_105400; UHD_003.008.001-42-g8c87a524
-- Operating over USB 3.
-- Initialize CODEC control...
-- Initialize Radio control...
-- Performing register loopback test... pass
-- Performing register loopback test... pass
-- Performing CODEC loopback test... pass
-- Performing CODEC loopback test... pass
-- Asking for clock rate 32.000000 MHz...
-- Actually got clock rate 32.000000 MHz.
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
-- Setting master clock rate selection to 'automatic'.
-- Asking for clock rate 32.768000 MHz...
-- Actually got clock rate 32.768000 MHz.
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
-- Successfully tuned to 100.000000 MHz
--
-- Asking for clock rate 32.768000 MHz... OK
-- Successfully tuned to 100.000000 MHz
--
-- Asking for clock rate 32.768000 MHz... OK
-- Successfully tuned to 100.000000 MHz
--
Using Volk machine: avx_64_mmx
-- Asking for clock rate 32.768000 MHz... OK
-- Asking for clock rate 32.768000 MHz... OK
-- Asking for clock rate 32.768000 MHz... OK
-- Asking for clock rate 32.768000 MHz... OK
-- Asking for clock rate 32.768000 MHz... OK
-- Asking for clock rate 32.768000 MHz... OK
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDS
Surely I shouldn't get overflow errors at such a low sampling rate?
When I run the benchmark_rate it returns no errors. Any help would be
appreciated.
Chad
Update to a newer UHD (and matching firmware), and try your test
again. My recollection is that there was a restriction for TX/RX
applications
on B210 that they had to be symmetric with respect to number of TX/RX
streams.
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