Hi Marcus
The voltage level of my PPS is 5.04V,from a trimble thunderbolt.
This is the complete output log when I run test_pps_input.
itupac@itupac:~/workarea-uhd/uhd/host/build/examples$ ./test_pps_input --source external
[INFO] [UHD] linux; GNU C++ version 7.4.0; Boost_106501; UHD_3.14.0.HEAD-0-g6875d061
[WARNING]
[UHD] Unable to set the thread priority. Performance may be negatively affected.
Please see the general application notes in the manual for instructions.
EnvironmentError: OSError: error in pthread_setschedparamCreating the usrp device with: ...
[INFO] [USRP2] Opening a USRP2/N-Series device...
[INFO] [USRP2] Current recv frame size: 1472 bytes
[INFO] [USRP2] Current send frame size: 1472 bytes
[WARNING] [USRP2] Unable to identify device - assuming USRP2/N-Series device
[WARNING] [UHD] Unable to set the thread priority. Performance may be negatively affected.
Please see the general application notes in the manual for instructions.
EnvironmentError: OSError: error in pthread_setschedparam
Using Device: Single USRP:
Device: USRP2 / N-Series Device
Mboard 0: N???
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: BasicRX (AB)
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: Unknown (0xffff) - 0
Attempt to detect the PPS and set the time...
[INFO] [MULTI_USRP] 1) catch time transition at pps edge
[WARNING] [UHD] Unable to set the thread priority. Performance may be negatively affected.
Please see the general application notes in the manual for instructions.
EnvironmentError: OSError: error in pthread_setschedparam
[WARNING] [UHD] Unable to set the thread priority. Performance may be negatively affected.
Please see the general application notes in the manual for instructions.
[WARNING] [UHD] Unable to set the thread priority. Performance may be negatively affected.
Please see the general application notes in the manual for instructions.
EnvironmentError: OSError: error in pthread_setschedparam
Error: RuntimeError: Board 0 may not be getting a PPS signal!
No PPS detected within the time interval.
See the application notes for your device.