Allow setting of non-standard FPGA master clock frequency for USRP1

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@10193 221aa14e-8319-0410-a670-987f0aec2ac5

5 files changed, 30 insertions, 5 deletions

diff --git a/gr-usrp/src/usrp_base.cc b/gr-usrp/src/usrp_base.cc
index 1709c7a44..a4cf64ed7 100644
--- a/gr-usrp/src/usrp_base.cc
+++ b/gr-usrp/src/usrp_base.cc
@@ -83,6 +83,12 @@ usrp_base::fpga_master_clock_freq() const
 }
 
 void
+usrp_base::set_fpga_master_clock_freq(long master_clock)
+{
+  d_usrp_basic->set_fpga_master_clock_freq(master_clock);
+}
+
+void
 usrp_base::set_verbose (bool verbose)
 {  
   d_usrp_basic->set_verbose (verbose);
diff --git a/gr-usrp/src/usrp_base.h b/gr-usrp/src/usrp_base.h
index 83aa699ab..c106739d0 100644
--- a/gr-usrp/src/usrp_base.h
+++ b/gr-usrp/src/usrp_base.h
@@ -98,7 +98,16 @@ public:
   /*!
    * \brief return frequency of master oscillator on USRP
    */
-  long  fpga_master_clock_freq() const;
+  long fpga_master_clock_freq() const;
+
+  /*!
+   * Tell API that the master oscillator on the USRP is operating at a non-standard 
+   * fixed frequency. This is only needed for custom USRP hardware modified to 
+   * operate at a different frequency from the default factory configuration. This
+   * function must be called prior to any other API function.
+   * \param master_clock USRP2 FPGA master clock frequency in Hz (10..64 MHz)
+   */
+  void set_fpga_master_clock_freq (long master_clock);
 
   void set_verbose (bool on);
 
diff --git a/gr-usrp/src/usrp_base.i b/gr-usrp/src/usrp_base.i
index 8f0c8368d..d0ece1fb2 100644
--- a/gr-usrp/src/usrp_base.i
+++ b/gr-usrp/src/usrp_base.i
@@ -38,7 +38,8 @@ public:
   db_base_sptr db(int which_side, int which_dev);
   %rename (_real_selected_subdev) selected_subdev;
   db_base_sptr selected_subdev(usrp_subdev_spec ss);
-  long  fpga_master_clock_freq() const;
+  long fpga_master_clock_freq() const;
+  void set_fpga_master_clock_freq(long master_clock);
   void set_verbose (bool on);
   static const int READ_FAILED = -99999;
   bool write_eeprom (int i2c_addr, int eeprom_offset, const std::string buf);
diff --git a/usrp/host/lib/legacy/usrp_basic.cc b/usrp/host/lib/legacy/usrp_basic.cc
index e63a097ac..883e5ede4 100644
--- a/usrp/host/lib/legacy/usrp_basic.cc
+++ b/usrp/host/lib/legacy/usrp_basic.cc
@@ -112,7 +112,7 @@ usrp_basic::usrp_basic (int which_board,
   : d_udh (0),
     d_usb_data_rate (16000000),	// SWAG, see below
     d_bytes_per_poll ((int) (POLLING_INTERVAL * d_usb_data_rate)),
-    d_verbose (false), d_db(2)
+    d_verbose (false), d_fpga_master_clock_freq(64000000), d_db(2)
 {
   /*
    * SWAG: Scientific Wild Ass Guess.
diff --git a/usrp/host/lib/legacy/usrp_basic.h b/usrp/host/lib/legacy/usrp_basic.h
index c5e3d2824..2caac7b66 100644
--- a/usrp/host/lib/legacy/usrp_basic.h
+++ b/usrp/host/lib/legacy/usrp_basic.h
@@ -1,4 +1,3 @@
-
 /* -*- c++ -*- */
 /*
  * Copyright 2003,2004,2008 Free Software Foundation, Inc.
@@ -69,6 +68,7 @@ protected:
   int			 d_usb_data_rate;	// bytes/sec
   int			 d_bytes_per_poll;	// how often to poll for overruns
   bool			 d_verbose;
+  long                   d_fpga_master_clock_freq;
 
   static const int	 MAX_REGS = 128;
   unsigned int		 d_fpga_shadows[MAX_REGS];
@@ -177,7 +177,16 @@ public:
   /*!
    * \brief return frequency of master oscillator on USRP
    */
-  long  fpga_master_clock_freq () const { return 64000000; }
+  long fpga_master_clock_freq () const { return d_fpga_master_clock_freq; }
+
+  /*!
+   * Tell API that the master oscillator on the USRP is operating at a non-standard 
+   * fixed frequency. This is only needed for custom USRP hardware modified to 
+   * operate at a different frequency from the default factory configuration. This
+   * function must be called prior to any other API function.
+   * \param master_clock USRP2 FPGA master clock frequency in Hz (10..64 MHz)
+   */
+  void set_fpga_master_clock_freq (long master_clock) { d_fpga_master_clock_freq = master_clock; }
 
   /*!
    * \returns usb data rate in bytes/sec