On 07/29/2018 03:23 PM, Jack Yang 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
In which case, there's an issue with your code that is not immediately
leaping out at me.
Compare the code generated by GRC with your code, and see what the
difference is. I know that the GRC-generated code defers streaming
start a little bit.
On Sun, Jul 29, 2018 at 11:59 AM, Marcus D. Leech <[email protected]
<mailto:[email protected]>> 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
<[email protected] <mailto:[email protected]>>
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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