I figured out the issue. I had forgot to set_time_source to the external PPS.
Although, I guess I should have figured that when I unplugged the ext PPS to
check its frequency and the PPS LED kept blinking...
Now it works :)
Jack Gallegos
---- On Fri, 22 Jul 2022 18:22:18 -0700 Marcus D. Leech
<patchvonbr...@gmail.com> wrote ---
On 2022-07-22 14:53, Jack Gallegos
wrote:
Which version of UHD? Can you share the actual code you're using to
set-up streaming, and setting of the clocks?
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I am trying to receive samples from a transmitter that
sends a data burst every second starting on rising edge of GPS
PPS with my X310. My program structure works like this:
initialize USRP -> create stream command as
MODE_NUM_SAMPS_AND_DONE and stream_now=false -> set time on
USRP at next pps to 0.0 seconds -> wait 2 seconds in thread
for supposed issue on PPS taking time to update -> set
stream command time_spec to be time of last PPS + 1.0 seconds
(so in theory, on another PPS edge) -> issue stream command
-> receive samples
The ref and pps sources are from external gpsdo and I can
tell they are selected because the PPS LED is blinking and the
REF LED is solid and external sensors are checked for lock
during initialization.
However, when I run this program, I am finding that the
USRP is not sampling at the start of the PPS, but at seemingly
random times. For example, looking at the received samples,
the transmitted pulse that I know for certain is starting with
the PPS is being received at 0.1, 0.2, 0.3 seconds, etc.
How can I be sure that the USRP knows to sample directly on
the PPS edge?
-Jack Gallegos _______________________________________________
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