4 files changed, 35 insertions, 0 deletions
diff --git a/gr-uhd/include/gr_uhd_usrp_sink.h b/gr-uhd/include/gr_uhd_usrp_sink.h
index ce76ec03b..d6cbe2fdc 100644
--- a/gr-uhd/include/gr_uhd_usrp_sink.h
+++ b/gr-uhd/include/gr_uhd_usrp_sink.h
@@ -448,6 +448,15 @@ public:
      * \return the multi usrp device object
      */
     virtual uhd::usrp::multi_usrp::sptr get_device(void) = 0;
+
+    /*!
+     * Perform write on the user configuration register bus.  These only exist if
+     * the user has implemented custom setting registers in the device FPGA.
+     * \param addr 8-bit register address
+     * \param data 32-bit register value
+     * \param mboard which motherboard to set the user register
+     */
+    virtual void set_user_register(const uint8_t addr, const uint32_t data, size_t mboard = 0) = 0;
 };
 
 #endif /* INCLUDED_GR_UHD_USRP_SINK_H */
diff --git a/gr-uhd/include/gr_uhd_usrp_source.h b/gr-uhd/include/gr_uhd_usrp_source.h
index 8a799b397..cf2186bc0 100644
--- a/gr-uhd/include/gr_uhd_usrp_source.h
+++ b/gr-uhd/include/gr_uhd_usrp_source.h
@@ -457,6 +457,15 @@ public:
     virtual uhd::usrp::multi_usrp::sptr get_device(void) = 0;
 
     /*!
+     * Perform write on the user configuration register bus.  These only exist if
+     * the user has implemented custom setting registers in the device FPGA.
+     * \param addr 8-bit register address
+     * \param data 32-bit register value
+     * \param mboard which motherboard to set the user register
+     */
+    virtual void set_user_register(const uint8_t addr, const uint32_t data, size_t mboard = 0) = 0;
+
+    /*!
      * Convenience function for finite data acquisition.
      * This is not to be used with the scheduler; rather,
      * one can request samples from the USRP in python.
diff --git a/gr-uhd/lib/gr_uhd_usrp_sink.cc b/gr-uhd/lib/gr_uhd_usrp_sink.cc
index 05237100c..7d173d972 100644
--- a/gr-uhd/lib/gr_uhd_usrp_sink.cc
+++ b/gr-uhd/lib/gr_uhd_usrp_sink.cc
@@ -278,6 +278,15 @@ public:
         return _dev;
     }
 
+    void set_user_register(const uint8_t addr, const uint32_t data, size_t mboard){
+        #ifdef UHD_USRP_MULTI_USRP_USER_REGS_API
+        _dev->set_user_register(addr, data, mboard);
+        #else
+        throw std::runtime_error("not implemented in this version");
+        #endif
+    }
+
+
 /***********************************************************************
  * Work
  **********************************************************************/
diff --git a/gr-uhd/lib/gr_uhd_usrp_source.cc b/gr-uhd/lib/gr_uhd_usrp_source.cc
index 2244238bd..5d3a3321e 100644
--- a/gr-uhd/lib/gr_uhd_usrp_source.cc
+++ b/gr-uhd/lib/gr_uhd_usrp_source.cc
@@ -290,6 +290,14 @@ public:
         return _dev;
     }
 
+    void set_user_register(const uint8_t addr, const uint32_t data, size_t mboard){
+        #ifdef UHD_USRP_MULTI_USRP_USER_REGS_API
+        _dev->set_user_register(addr, data, mboard);
+        #else
+        throw std::runtime_error("not implemented in this version");
+        #endif
+    }
+
 /***********************************************************************
  * Work
  **********************************************************************/