Hey,
have you tried starting the RX streamer a little bit in the future, i.e
change the following lines:
stream_cmd.stream_now = true;
stream_cmd.time_spec = uhd::time_spec_t();
to something like (out of the top of my head):
stream_cmd.stream_now = false;
stream_cmd.time_spec = usrp->get_time_now() + 0.05;
?
I have seen the same behavior on my B210 in dual channel RX setups when
starting the streamer immediately. So maybe this helps.
Cheers,
Julian
On 29.07.2018 21:23, Jack Yang via USRP-users wrote:
Hi Marcus,
Even I used 1Msps or less than this sampling rate, I still saw this time
alignment issue. When I am using GNURadio system with python script
instead of using UHD API, I can run 10Msps for my 4 channel phase array
receiver without any problems. My final goal is to have 50Msps for my 4
channel phase array receiver with dual 10 GiGe cable setup and CDUA
computation for wideband AoA detection. My desktop spec is Processors:
Intel Core i9 7900X 10-Core 3.3GHz (4.3GHz TurboBoost), Memory: 32GB
ORIGIN PC DDR4 Powered by Kingston 3000MHz (4 X 8GB),.
Thanks!
All Best,
Jack
On Sun, Jul 29, 2018 at 11:59 AM, Marcus D. Leech <mle...@ripnet.com
<mailto:mle...@ripnet.com>> wrote:
On 07/29/2018 12:56 PM, Jack Yang wrote:
Hi Marcus,
Thanks for your mail. Yes, I am using 10GiGe interface to run the
UHD C++ code.
Any thoughts or suggestions?
All Best,
Jack
On Sun, Jul 29, 2018 at 9:35 AM, Marcus D. Leech via USRP-users
<usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>>
wrote:
On 07/29/2018 12:52 AM, Jack Yang via USRP-users wrote:
Hi,
I have rewrote "rx_samples_to_file.cpp" for making four
channel coherent receiver (phased-array receiver) in X310.
When I executed my code, the terminal showed that
*[ERROR] [STREAMER] The receive packet handler failed to
time-align packets. 1002 received packets were processed by
the handler. However, a timestamp match could not be determined.*
I have attached my code as the following link
(https://www.dropbox.com/s/x0u0tw5e65iaual/rx_samples_X310_TwinRx.cpp?dl=0
<https://www.dropbox.com/s/x0u0tw5e65iaual/rx_samples_X310_TwinRx.cpp?dl=0>).
The info for my UHD version is shown in below
*"[INFO] [UHD] linux; GNU C++ version 5.4.0 20160609;
Boost_105800; UHD_3.11.0.HEAD-0-ga1b5c4ae"*
Could someone guide me how to fix this issue? I am using two
TwinRx with a X310 for my coherent receiver. I basically
followed gr-doa python configuration to set up the USRP
device in C++ code. However, I cannot find out why the time
alignment is failed in here.
The detailed print-out message is also listed here
Thanks!
All Best,
Jack
Creating the usrp device with: addr=192.168.40.2...
[INFO] [UHD] linux; GNU C++ version 5.4.0 20160609;
Boost_105800; UHD_3.11.0.HEAD-0-ga1b5c4ae
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Determining maximum frame size...
[INFO] [X300] Maximum frame size: 8000 bytes.
[INFO] [X300] Setup basic communication...
[INFO] [X300] Loading values from EEPROM...
[INFO] [X300] Setup RF frontend clocking...
[INFO] [X300] Radio 1x clock:200
[INFO] [RFNOC DMA FIFO] Running BIST for FIFO 0...
[INFO] [RFNOC DMA FIFO] BIST passed (Throughput: 1299 MB/s)
[INFO] [RFNOC DMA FIFO] Running BIST for FIFO 1...
[INFO] [RFNOC DMA FIFO] BIST passed (Throughput: 1316 MB/s)
[WARNING] [RFNOC] [0/Radio_0] defines 2 input buffer sizes,
but 1 input ports
[INFO] [RFNOC RADIO] Register loopback test passed
[INFO] [RFNOC RADIO] Register loopback test passed
[WARNING] [RFNOC] [0/Radio_1] defines 2 input buffer sizes,
but 1 input ports
[INFO] [RFNOC RADIO] Register loopback test passed
[INFO] [RFNOC RADIO] Register loopback test passed
[INFO] [CORES] Performing timer loopback test...
[INFO] [CORES] Timer loopback test passed
[INFO] [CORES] Performing timer loopback test...
[INFO] [CORES] Timer loopback test passed
Using Device: Single USRP:
Device: X-Series Device
Mboard 0: X310
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: TwinRX RX0
RX Channel: 1
RX DSP: 1
RX Dboard: A
RX Subdev: TwinRX RX1
RX Channel: 2
RX DSP: 0
RX Dboard: B
RX Subdev: TwinRX RX0
RX Channel: 3
RX DSP: 1
RX Dboard: B
RX Subdev: TwinRX RX1
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: Unknown (0x0094) - 0
TX Channel: 1
TX DSP: 0
TX Dboard: B
TX Subdev: Unknown (0x0094) - 0
Setting RX Rate: 10.000000 Msps...
Actual RX Rate: 10.000000 Msps...
[INFO] [MULTI_USRP] 1) catch time transition at pps edge
[INFO] [MULTI_USRP] 2) set times next pps (synchronously)
Setting RX Gain: 60.000000 dB...
Actual RX Gain: 60.000000 dB...
Setting RX Freq: 900.000000 MHz...
Waiting for "lo_locked": + locked.
Press Ctrl + C to stop streaming...
[ERROR] [STREAMER] The receive packet handler failed to
time-align packets. 1002 received packets were processed by
the handler. However, a timestamp match could not be determined.
You're presumably doing this over a 10GiGe interface?
If you run at a lower sample-rate, like 5Msps do you see this problem?
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