3 files changed, 21 insertions, 2 deletions
diff --git a/host/lib/usrp/usrp2/clock_ctrl.cpp b/host/lib/usrp/usrp2/clock_ctrl.cpp
index 72f92c081..c3dc4917e 100644
--- a/host/lib/usrp/usrp2/clock_ctrl.cpp
+++ b/host/lib/usrp/usrp2/clock_ctrl.cpp
@@ -212,6 +212,19 @@ public:
     std::vector<double> get_rates_tx_dboard_clock(void){
         return get_rates_rx_dboard_clock(); //same master clock, same dividers...
     }
+    
+    void enable_test_clock(bool enb) {
+        _ad9510_regs.power_down_lvpecl_out0 = enb?
+            ad9510_regs_t::POWER_DOWN_LVPECL_OUT0_NORMAL :
+            ad9510_regs_t::POWER_DOWN_LVPECL_OUT0_SAFE_PD;
+        _ad9510_regs.output_level_lvpecl_out0 = ad9510_regs_t::OUTPUT_LEVEL_LVPECL_OUT0_810MV;
+        _ad9510_regs.divider_low_cycles_out0 = 0;
+        _ad9510_regs.divider_high_cycles_out0 = 0;
+        _ad9510_regs.bypass_divider_out0 = 1;
+        this->write_reg(0x3c);
+        this->write_reg(0x48);
+        this->write_reg(0x49);
+    }
 
     /*!
      * If we are to use an external reference, enable the charge pump.
diff --git a/host/lib/usrp/usrp2/clock_ctrl.hpp b/host/lib/usrp/usrp2/clock_ctrl.hpp
index 70a104a81..db6c52c83 100644
--- a/host/lib/usrp/usrp2/clock_ctrl.hpp
+++ b/host/lib/usrp/usrp2/clock_ctrl.hpp
@@ -83,6 +83,12 @@ public:
      * \param enb true to enable
      */
     virtual void enable_external_ref(bool enb) = 0;
+    
+    /*!
+     * Enable/disable test clock output.
+     * \param enb true to enable
+     */
+    virtual void enable_test_clock(bool enb) = 0;
 
     /*!
      * TODO other clock control api here....
diff --git a/host/lib/usrp/usrp2/mboard_impl.cpp b/host/lib/usrp/usrp2/mboard_impl.cpp
index 3ae21e621..8c5ef49ed 100644
--- a/host/lib/usrp/usrp2/mboard_impl.cpp
+++ b/host/lib/usrp/usrp2/mboard_impl.cpp
@@ -168,7 +168,6 @@ void usrp2_mboard_impl::update_clock_config(void){
         default: throw std::runtime_error("usrp2: unhandled clock configuration reference source");
         }
     } else {
-    
         switch(_clock_config.ref_source){
         case clock_config_t::REF_INT : _iface->poke32(_iface->regs.misc_ctrl_clock, 0x10); break;
         case clock_config_t::REF_SMA : _iface->poke32(_iface->regs.misc_ctrl_clock, 0x1C); break;
@@ -178,7 +177,8 @@ void usrp2_mboard_impl::update_clock_config(void){
     }
 
     //clock source ref 10mhz
-    bool use_external = _clock_config.ref_source != clock_config_t::REF_INT;
+    bool use_external = (_clock_config.ref_source != clock_config_t::REF_INT)
+                     || (_iface->get_hw_rev() >= USRP2P_FIRST_HW_REV); //USRP2P has an internal 10MHz TCXO
     _clock_ctrl->enable_external_ref(use_external);
 }