Dear Jonathan
Your workaround helps me to solve the issue. But what about the fact
that I really need those two constant zero TX channel since I need them
for receiving.
Dear Marcus
I didnt get your point about set sample rate to 10Msps with the same
bandwidth. Would you explain more?
I know that L character at console means starving for samples but what I
really dont understand is that why it comes up when skip_dram argument
sets to one with the same sample rate though?
Regards.
On 10/7/21 1:02, Jonathon Pendlum wrote:
Hi Armin,
What happens if you set the number of channels to 4 (with the
skip_dram arg removed), and drive the two unused TX channels with a
const source 0?
Jonathon
On Fri, Jul 9, 2021 at 11:56 AM Marcus D. Leech
<patchvonbr...@gmail.com <mailto:patchvonbr...@gmail.com>> wrote:
On 07/09/2021 11:54 AM, Armin Ghani wrote:
5Msps
If there's a way to up it to 10Msps (keeping the same bandwidth),
that might help with the "L"--which basically means the
pipeline is starving for samples. Now, it might also mean that
your computer cannot "keep up" and is delivering samples
a little late.
On 9/7/21 17:50, Marcus D. Leech wrote:
On 07/09/2021 10:31 AM, Armin Ghani wrote:
Thanks Marcus.
It helped to resolve the error. But UHD consistently prints "L"
in the output.
Would you what DRAM FIFO block actually does?
It's a FIFO between the DUC and the ADC as far as I know.
What is your sample rate?
Regards
On 9/7/21 14:41, Marcus D. Leech wrote:
On 07/09/2021 07:40 AM, Armin Ghani wrote:
Dear community
I've been trying to make a fully synchronous multi USRP
transmitter in GNURadio v3.8.2.0 and UHD v3.15.0.0.
In order to have a common clock and time between 2 USRPs, an
octoclock is also used.
when trying to run a flowgraph which consists one multi_usrp
sink block that is connected to a signal source in GNURadio
and running the flowgrapth I get this error:
Executing: /usr/bin/python3 -u
/home/.../Documents/gnuradio-tests/octoclock_test.py
[INFO] [UHD] linux; GNU C++ version 9.3.0; Boost_107100;
UHD_3.15.0.HEAD-0-gaea0e2de
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Maximum frame size: 7972 bytes.
[WARNING] [X300] For the 192.168.30.2 connection, UHD
recommends a receive frame size of at least 8000 for best
performance, but your configuration will only allow 7972.This
may negatively impact your maximum achievable sample rate.
Check the MTU on the interface and/or the recv_frame_size
argument.
[INFO] [X300] Maximum frame size: 7972 bytes.
[WARNING] [X300] For the 192.168.50.2 connection, UHD
recommends a receive frame size of at least 8000 for best
performance, but your configuration will only allow 7972.This
may negatively impact your maximum achievable sample rate.
Check the MTU on the interface and/or the recv_frame_size
argument.
[INFO] [X300] Radio 1x clock: 200 MHz
[INFO] [0/DmaFIFO_0] Initializing block control (NOC ID:
0xF1F0D00000000000)
[INFO] [X300] Radio 1x clock: 200 MHz
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1308 MB/s)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1312 MB/s)
[INFO] [1/DmaFIFO_0] Initializing block control (NOC ID:
0xF1F0D00000000000)
[INFO] [1/DmaFIFO_0] BIST passed (Throughput: 1316 MB/s)
[INFO] [1/DmaFIFO_0] BIST passed (Throughput: 1304 MB/s)
[INFO] [0/Radio_0] Initializing block control (NOC ID:
0x12AD100000000001)
[INFO] [1/Radio_0] Initializing block control (NOC ID:
0x12AD100000000001)
[INFO] [0/Radio_1] Initializing block control (NOC ID:
0x12AD100000000001)
[INFO] [1/Radio_1] Initializing block control (NOC ID:
0x12AD100000000001)
[INFO] [0/DDC_0] Initializing block control (NOC ID:
0xDDC0000000000000)
[INFO] [1/DDC_0] Initializing block control (NOC ID:
0xDDC0000000000000)
[INFO] [0/DDC_1] Initializing block control (NOC ID:
0xDDC0000000000000)
[INFO] [1/DDC_1] Initializing block control (NOC ID:
0xDDC0000000000000)
[INFO] [0/DUC_0] Initializing block control (NOC ID:
0xD0C0000000000000)
[INFO] [1/DUC_0] Initializing block control (NOC ID:
0xD0C0000000000000)
[INFO] [0/DUC_1] Initializing block control (NOC ID:
0xD0C0000000000000)
[INFO] [1/DUC_1] Initializing block control (NOC ID:
0xD0C0000000000000)
[INFO] [MULTI_USRP] 1) catch time transition at pps edge
[INFO] [MULTI_USRP] 2) set times next pps (synchronously)
thread[thread-per-block[6]: <block usrp_sink(1)>]:
RuntimeError: Multiple sampling rates downstream of TX
Terminator 0: RuntimeError: Node 0/DUC_0 specifies 1e+06,
node 0/DUC_1 specifies 390625.
What happens if you use the "skip_dram=1" argument in the
device argument?
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Armin Ghani
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Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
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Research Engineer | Communication Systems Division (CSD)
agh...@cttc.es <mailto:agh...@cttc.es>| +34 93 645 29 08 (2143)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Av. Carl Friedrich Gauss, 7 - Edifici B4 - PMT
08860 - Castelldefels (Barcelona, Spain)
www.cttc.cat
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Research Engineer | Communication Systems Division (CSD)
agh...@cttc.es <mailto:agh...@cttc.es>| +34 93 645 29 08 (2143)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Av. Carl Friedrich Gauss, 7 - Edifici B4 - PMT
08860 - Castelldefels (Barcelona, Spain)
www.cttc.cat
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