Thank you so much!! Julian! Starting the RX streamer a little bit in the future works!! Now I can align 4 channels as coherent receiver with 50M sps without problem. Also thanks for Marcus's help
All Best, Jack On Sun, Jul 29, 2018 at 12:49 PM, Julian Arnold <jul...@elitecoding.org> wrote: > 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? >> >> >> >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >>
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