diff options
Diffstat (limited to 'host')
| -rw-r--r-- | host/docs/usrp_x3x0.dox | 15 | ||||
| -rw-r--r-- | host/lib/usrp/x300/x300_impl.cpp | 4 |
2 files changed, 15 insertions, 4 deletions
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 <install-path>/lib/uhd/examples ./test_pps_input --args=\<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. diff --git a/host/lib/usrp/x300/x300_impl.cpp b/host/lib/usrp/x300/x300_impl.cpp index 22ebdf546..9b0fe9a51 100644 --- a/host/lib/usrp/x300/x300_impl.cpp +++ b/host/lib/usrp/x300/x300_impl.cpp @@ -981,7 +981,7 @@ void x300_impl::setup_mb(const size_t mb_i, const uhd::device_addr_t &dev_addr) // setup time sources and properties //////////////////////////////////////////////////////////////////// _tree->create<std::string>(mb_path / "time_source" / "value") - .set("internal") + .set(mb.args.get_time_source()) .add_coerced_subscriber([this, &mb](const std::string& time_source){ this->update_time_source(mb, time_source); }) @@ -1003,7 +1003,7 @@ void x300_impl::setup_mb(const size_t mb_i, const uhd::device_addr_t &dev_addr) // setup clock sources and properties //////////////////////////////////////////////////////////////////// _tree->create<std::string>(mb_path / "clock_source" / "value") - .set(x300::DEFAULT_TIME_SOURCE) + .set(mb.args.get_clock_source()) .add_coerced_subscriber([this, &mb](const std::string& clock_source){ this->update_clock_source(mb, clock_source); }) |