On 8/20/19 7:40 AM, Jason Roehm via USRP-users wrote:
On 8/19/19 6:52 PM, Neel Pandeya wrote:
Hello Jason:
Thanks for all the detailed feedback! No worries about not having a
stand-alone reproducing program at the moment. Could you please try
using the head of the "UHD-3.14" branch? We just tagged
v3.14.1.1-rc1 with some bug fixes, which we think should address the
issue. Please let me know your results running with that, and we'll
go from there.
--Neel Pandeya
Neel,
I saw the same behavior with the UHD-3.14 branch. I was able to take
the time to put together a self-contained reproducer; see the attached
source file. It's just a simple C++ program that initializes the USRP,
streams a few blocks of data in, and checks the timestamps of
consecutive blocks for continuity. When I run it, I see the following
output:
[jasonr@host:~/test_uhd]$ LD_LIBRARY_PATH=~/git/sceptre/deps/lib
./test_uhd
[INFO] [UHD] linux; GNU C++ version 7.4.0; Boost_106900;
UHD_3.14.1.HEAD-0-g98c7c986
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Maximum frame size: 8000 bytes.
[INFO] [X300] Radio 1x clock: 200 MHz
[INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 0.929a
[INFO] [0/DmaFIFO_0] Initializing block control (NOC ID:
0xF1F0D00000000000)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1303 MB/s)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1312 MB/s)
[INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000000)
[INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000)
[WARNING] [X300] Cannot update master clock rate! X300 Series does not
allow changing the clock rate during runtime.
Block 1: 16384 samples @ 100 MSPS
Timestamp: 1.96557
Block 2: 16384 samples @ 100 MSPS
Timestamp: 1.9659
Last timestamp: 1.96557
Difference: 0.00032352
Expected difference: 0.00016384
Block 3: 16384 samples @ 100 MSPS
Timestamp: 1.96622
Last timestamp: 1.9659
Difference: 0.00032352
Expected difference: 0.00016384
Block 4: 16384 samples @ 100 MSPS
Timestamp: 1.96654
Last timestamp: 1.96622
Difference: 0.00032352
Expected difference: 0.00016384
Block 5: 16384 samples @ 100 MSPS
Timestamp: 1.96687
Last timestamp: 1.96654
Difference: 0.00032352
Expected difference: 0.00016384
Block 6: 16384 samples @ 100 MSPS
Timestamp: 1.96721
Last timestamp: 1.96687
Difference: 0.00034348
Expected difference: 0.00016384
Block 7: 16384 samples @ 100 MSPS
Timestamp: 1.96753
Last timestamp: 1.96721
Difference: 0.00032352
Expected difference: 0.00016384
Block 8: 16384 samples @ 100 MSPS
Timestamp: 1.96786
Last timestamp: 1.96753
Difference: 0.00032352
Expected difference: 0.00016384
Block 9: 16384 samples @ 100 MSPS
Timestamp: 1.96818
Last timestamp: 1.96786
Difference: 0.00032352
Expected difference: 0.00016384
Block 10: 16384 samples @ 100 MSPS
Timestamp: 1.96851
Last timestamp: 1.96818
Difference: 0.00032352
Expected difference: 0.00016384
[jasonr@gauss:~/git/sceptre/test/test_uhd]$
Thanks for your help.
Jason
Neel,
Have you been able to take a look at this further?
Jason
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