Hello,
I have a USRP E310 that I'm trying to synchronize to an external 1 PPS input.
My goal is to trigger the SDR to begin receiving samples on the rising edge of
the external PPS, so I'm using a pulse generator to generate a square wave with
5V amplitude and 25% duty cycle, 1 second period and connecting that to the
sync port on the e310. The problem is that I can't tell if the device is
actually seeing that external PPS signal, when I run the test_pps_input
utitlity it passes regardless of whether the external PPS is connected or not.
It seems like the test_pps_input should throw an error if there is no external
PPS present, correct? The Checking ref_locked sensor...FAIL! happens even with
the external PPS connected.
Here are the outputs from the test_pps_input utility:
***************************************************************************************************
root@ni-e31x-30FB1A6:/usr/lib/uhd/examples# ./test_pps_input --source "external"
Creating the USRP device with: ...
[INFO] [UHD] linux; GNU C++ version 9.2.0; Boost_107100; UHD_4.6.0.0-0-g50fa3baa
[INFO] [MPMD] Initializing 1 device(s) in parallel with args:
mgmt_addr=127.0.0.1,type=e3xx,product=e310_sg3,serial=30FB1A6,name=ni-e31x-30FB1A6,fpga=n/a,claimed=False
[INFO] [MPM.PeriphManager] init() called with device args
`fpga=n/a,mgmt_addr=127.0.0.1,name=ni-e31x-30FB1A6,product=e310_sg3'.
[INFO] [0/Radio#0] Performing CODEC loopback test on channel 0 ...
[INFO] [0/Radio#0] CODEC loopback test passed
[INFO] [0/Radio#0] Performing CODEC loopback test on channel 1 ...
[INFO] [0/Radio#0] CODEC loopback test passed
Using Device: Single USRP:
Device: E300-Series Device
Mboard 0: e310_sg3
RX Channel: 0
RX DSP: n/a
RX Dboard: A
RX Subdev: E3xx
RX Channel: 1
RX DSP: n/a
RX Dboard: A
RX Subdev: E3xx
TX Channel: 0
TX DSP: n/a
TX Dboard: A
TX Subdev: E3xx
TX Channel: 1
TX DSP: n/a
TX Dboard: A
TX Subdev: E3xx
Attempt to detect the PPS and set the time...
[INFO] [MULTI_USRP] 1) catch time transition at pps edge
[INFO] [MULTI_USRP] 2) set times next pps (synchronously)
Success!
Product requires verification of ref_locked sensor!
Checking ref_locked sensor...FAIL!
***************************************************************************************************
Again, this output does not change whether my external PPS is connected or not.
I'm using UHD 4.6, any help would be greatly appreciated.
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