From 2e838250863eb7f4e0c7d3800174b8ccc8dc2da9 Mon Sep 17 00:00:00 2001 From: Martin Braun Date: Tue, 24 Jul 2018 09:55:40 -0700 Subject: x300: Enable clock_source and time_source device args You can now change the time/clock source default through device args: auto usrp = uhd::usrp::multi_usrp::make( "type=x300,clock_source=external,time_source=external"); This also enables the use of config files for the clock/time source implicitly. --- host/docs/usrp_x3x0.dox | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) (limited to 'host/docs') diff --git a/host/docs/usrp_x3x0.dox b/host/docs/usrp_x3x0.dox index d76d5eaa0..84ef7bd99 100644 --- a/host/docs/usrp_x3x0.dox +++ b/host/docs/usrp_x3x0.dox @@ -616,10 +616,17 @@ Afterward, power-cycle your X-Series device for the changes to take effect. \subsection x3x0_hw_x3x0_hw_ref10M Ref Clock - 10 MHz Using an external 10 MHz reference clock, a square wave will offer the best phase -noise performance, but a sinusoid is acceptable. The power level of the reference clock cannot exceed +15 dBm. +noise performance, but a sinusoid is acceptable. +The power level of the reference clock must exceed +15 dBm. + +To use the external reference in your UHD session, make sure to either call +uhd::usrp::multi_usrp::set_clock_source() or specify `clock_source=external` in +your device args. \subsection x3x0_hw_pps PPS - Pulse Per Second -Using a PPS signal for timestamp synchronization requires a square wave signal with the following a 5Vpp amplitude. + +Using a PPS signal for timestamp synchronization requires a square wave signal +with a 5Vpp amplitude. To test the PPS input, you can use the following tool from the UHD examples: @@ -628,6 +635,10 @@ To test the PPS input, you can use the following tool from the UHD examples: cd /lib/uhd/examples ./test_pps_input --args=\ +To use the external time source in your UHD session, make sure to either call +uhd::usrp::multi_usrp::set_time_source() or specify `time_source=external` in +your device args. + \subsection x3x0_hw_gpsdo Internal GPSDO Please see \ref page_gpsdo_x3x0 for information on configuring and using the internal GPSDO. -- cgit v1.2.3