bladeRF: Add XB-200 support

This commit adds support for the bladeRF XB-200 transverter expansion
board. To enable the expansion board and to allow the osmocom source or
sink to tune down to 0Hz, parameter xb200 has to be set. XB-200 comes
with 4 filter banks which can be selected by passing their name as
a value of the xb200 parameter. Automatic filter selection will be
enabled if no value is given to the xb200 parameter.

Example:

osmocom_fft -a bladerf,xb200
osmocom_fft -a bladerf,xb200=50M

The following values are valid:
   "custom"  : custom band
   "50M"     :  50MHz band
   "144M"    : 144MHz band
   "222M"    : 222MHz band
   "auto3db" : Select fiterbank based on -3dB filter points
   "auto"    : Select filerbank based on -1dB filter points (default)

2 files changed, 38 insertions, 3 deletions

diff --git a/lib/bladerf/bladerf_common.cc b/lib/bladerf/bladerf_common.cc
index 7516020..3308c13 100644
--- a/lib/bladerf/bladerf_common.cc
+++ b/lib/bladerf/bladerf_common.cc
@@ -48,7 +48,13 @@ using namespace boost::assign;
 boost::mutex bladerf_common::_devs_mutex;
 std::list<boost::weak_ptr<struct bladerf> > bladerf_common::_devs;
 
-bladerf_common::bladerf_common() : _conv_buf(NULL), _conv_buf_size(4096) {}
+bladerf_common::bladerf_common() :
+  _conv_buf(NULL),
+  _conv_buf_size(4096),
+  _xb_200_attached(false)
+{
+
+}
 
 bladerf_common::~bladerf_common()
 {
@@ -301,11 +307,38 @@ void bladerf_common::init(dict_t &dict, bladerf_module module)
                    "and will have no effect. This parameter should be "
                    "specified on the associated bladeRF source."
                 << std::endl;
+  }
 
+  if ( dict.count("xb200") ) {
+    if (bladerf_expansion_attach(_dev.get(), BLADERF_XB_200)) {
+      std::cerr << _pfx << "Could not attach XB-200" << std::endl;
+    } else {
+      _xb_200_attached = true;
+
+      bladerf_xb200_filter filter = BLADERF_XB200_AUTO_1DB;
+
+      if ( dict["xb200"] == "custom" ) {
+        filter = BLADERF_XB200_CUSTOM;
+      } else if ( dict["xb200"] == "50M" ) {
+        filter = BLADERF_XB200_50M;
+      } else if ( dict["xb200"] == "144M" ) {
+        filter = BLADERF_XB200_144M;
+      } else if ( dict["xb200"] == "222M" ) {
+        filter = BLADERF_XB200_222M;
+      } else if ( dict["xb200"] == "auto3db" ) {
+        filter = BLADERF_XB200_AUTO_3DB;
+      } else if ( dict["xb200"] == "auto" ) {
+        filter = BLADERF_XB200_AUTO_1DB;
+      } else {
+        filter = BLADERF_XB200_AUTO_1DB;
+      }
 
+      if (bladerf_xb200_set_filterbank(_dev.get(), module, filter)) {
+          std::cerr << _pfx << "Could not set XB-200 filter" << std::endl;
+      }
+    }
   }
 
-
   /* Show some info about the device we've opened */
   std::cerr << _pfx << "Using nuand LLC bladeRF #" << device_number;
 
@@ -387,7 +420,7 @@ void bladerf_common::init(dict_t &dict, bladerf_module module)
 osmosdr::freq_range_t bladerf_common::freq_range()
 {
   /* assuming the same for RX & TX */
-  return osmosdr::freq_range_t( 300e6, 3.8e9 );
+  return osmosdr::freq_range_t( _xb_200_attached ? 0 : 300e6, 3.8e9 );
 }
 
 osmosdr::meta_range_t bladerf_common::sample_rates()
diff --git a/lib/bladerf/bladerf_common.h b/lib/bladerf/bladerf_common.h
index b13a6cf..3b1cb0b 100644
--- a/lib/bladerf/bladerf_common.h
+++ b/lib/bladerf/bladerf_common.h
@@ -82,6 +82,8 @@ protected:
 
   std::string _pfx;
 
+  bool _xb_200_attached;
+
   /* BladeRF IQ correction parameters */
   static const int16_t DCOFF_SCALE  = 2048;
   static const int16_t GAIN_SCALE   = 4096;