diff options
| -rw-r--r-- | host/lib/usrp/b200/b200_impl.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/host/lib/usrp/b200/b200_impl.cpp b/host/lib/usrp/b200/b200_impl.cpp index b3c190c50..b2f0d8d3e 100644 --- a/host/lib/usrp/b200/b200_impl.cpp +++ b/host/lib/usrp/b200/b200_impl.cpp @@ -833,6 +833,10 @@ void b200_impl::set_mb_eeprom(const uhd::usrp::mboard_eeprom_t &mb_eeprom) void b200_impl::update_clock_source(const std::string &source) { + // present the PLL with a valid 10 MHz signal before switching its reference + _gpio_state.ref_sel = (source == "gpsdo")? 1 : 0; + this->update_gpio_state(); + if (source == "internal"){ _adf4001_iface->set_lock_to_ext_ref(false); } @@ -843,9 +847,6 @@ void b200_impl::update_clock_source(const std::string &source) } else { throw uhd::key_error("update_clock_source: unknown source: " + source); } - - _gpio_state.ref_sel = (source == "gpsdo")? 1 : 0; - this->update_gpio_state(); } void b200_impl::update_time_source(const std::string &source) |