debugging information in lte-enb, addition of external reference option in lte-softmodem and usrp_lib.cpp

targets/ARCH/COMMON/common_lib.h

@@ -134,6 +134,14 @@ typedef struct {
   double offset;
 } rx_gain_calib_table_t;
 
+/*! \brief Clock source types */
+typedef enum {
+  //! This tells the underlying hardware to use the internal reference
+  internal=0,
+  //! This tells the underlying hardware to use the external reference
+  external=1
+} clock_source_t;
+
 /*! \brief RF frontend parameters set by application */
 typedef struct {
   //! Module ID for this configuration
@@ -186,6 +194,8 @@ typedef struct {
   double rx_bw;
   //! TX bandwidth in Hz
   double tx_bw;
+  //! clock source 
+  clock_source_t clock_source;
   //! Auto calibration flag
   int autocal[4];
   //! rf devices work with x bits iqs when oai have its own iq format