Seeing the same behavior using UHD 4.1.0.1 on my N320 and E320, using internal
clock and time sources:
$ ./lib/uhd/examples/test_timed_commands --args addr=192.168.10.2
Creating the usrp device with: addr=192.168.10.2...
[INFO] [UHD] linux; GNU C++ version 9.3.0; Boost_107100;
UHD_4.1.0.HEAD-0-gf633b497
...
Using Device: Single USRP:
Device: N300-Series Device
Mboard 0: n320
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: Rhodium
RX Channel: 1
RX DSP: 1
RX Dboard: B
RX Subdev: Rhodium
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: Rhodium
TX Channel: 1
TX DSP: 1
TX Dboard: B
TX Subdev: Rhodium
Testing support for timed commands on this hardware... pass
Perform fast readback of registers:
Difference between paired reads: 2285.387207 us
Testing control timed command:
Span : 100000.000000 us
Now : 467446.240234 us
Response 1: 469725.122070 us
Response 2: 471973.376465 us
Difference of response time 1: -97721.118164 us
Difference of response time 2: -195472.863770 us
Difference between actual and expected time delta: -97751.745605 us
About to start streaming using timed command:
Received packet: 100 samples, 0 full secs, 0.579987 frac secs
Stream time was: 0 full secs, 0.579987 frac secs
Difference between stream time and first packet: 0.000000 us
Done!
================================================================================
$ ./lib/uhd/examples/test_timed_commands --args addr=192.168.20.2
Creating the usrp device with: addr=192.168.20.2...
[INFO] [UHD] linux; GNU C++ version 9.3.0; Boost_107100;
UHD_4.1.0.HEAD-0-gf633b497
...
Using Device: Single USRP:
Device: E300-Series Device
Mboard 0: e320
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: E3xx
RX Channel: 1
RX DSP: 1
RX Dboard: A
RX Subdev: E3xx
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: E3xx
TX Channel: 1
TX DSP: 1
TX Dboard: A
TX Subdev: E3xx
Testing support for timed commands on this hardware... pass
Perform fast readback of registers:
Difference between paired reads: 2122.163125 us
Testing control timed command:
Span : 100000.000000 us
Now : 432457.750000 us
Response 1: 434731.875000 us
Response 2: 436887.437500 us
Difference of response time 1: -97725.875000 us
Difference of response time 2: -195570.312500 us
Difference between actual and expected time delta: -97844.437500 us
About to start streaming using timed command:
Received packet: 100 samples, 0 full secs, 0.550922 frac secs
Stream time was: 0 full secs, 0.550922 frac secs
Difference between stream time and first packet: 0.000000 us
Done!
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