5 files changed, 17 insertions, 11 deletions
diff --git a/gr-uhd/grc/gen_uhd_single_usrp_blocks_xml.py b/gr-uhd/grc/gen_uhd_single_usrp_blocks_xml.py
index 1ad3c09273..5b3cb5b5aa 100755
--- a/gr-uhd/grc/gen_uhd_single_usrp_blocks_xml.py
+++ b/gr-uhd/grc/gen_uhd_single_usrp_blocks_xml.py
@@ -26,7 +26,7 @@ MAIN_TMPL = """\
 	<key>uhd_single_usrp_$(sourk)</key>
 	<category>UHD</category>
 	<import>from gnuradio import uhd</import>
-	<make>uhd.single_usrp_$(sourk)(\$dev_addr, uhd.io_type_t.\$type.type)
+	<make>uhd.single_usrp_$(sourk)(\$dev_addr, uhd.io_type_t.\$type.type, \$nchan)
 self.\$(id).set_subdev_spec(\$sd_spec)
 self.\$(id).set_samp_rate(\$samp_rate)
 #for $n in range($max_nchan)
diff --git a/gr-uhd/lib/uhd_single_usrp_sink.cc b/gr-uhd/lib/uhd_single_usrp_sink.cc
index 1cd5afc87e..8cb3726d1a 100644
--- a/gr-uhd/lib/uhd_single_usrp_sink.cc
+++ b/gr-uhd/lib/uhd_single_usrp_sink.cc
@@ -39,8 +39,9 @@ class uhd_single_usrp_sink_impl : public uhd_single_usrp_sink{
 public:
     uhd_single_usrp_sink_impl(
         const std::string &args,
-        const uhd::io_type_t &type
-    ) : uhd_single_usrp_sink(gr_make_io_signature(1, 1, type.size)), _type(type)
+        const uhd::io_type_t &type,
+        size_t num_channels
+    ) : uhd_single_usrp_sink(gr_make_io_signature(num_channels, num_channels, type.size)), _type(type)
     {
         _dev = uhd::usrp::single_usrp::make(args);
     }
@@ -143,9 +144,10 @@ protected:
  **********************************************************************/
 boost::shared_ptr<uhd_single_usrp_sink> uhd_make_single_usrp_sink(
     const std::string &args,
-    const uhd::io_type_t::tid_t &type
+    const uhd::io_type_t::tid_t &type,
+    size_t num_channels
 ){
     return boost::shared_ptr<uhd_single_usrp_sink>(
-        new uhd_single_usrp_sink_impl(args, type)
+        new uhd_single_usrp_sink_impl(args, type, num_channels)
     );
 }
diff --git a/gr-uhd/lib/uhd_single_usrp_sink.h b/gr-uhd/lib/uhd_single_usrp_sink.h
index 61417168a6..bec788193b 100644
--- a/gr-uhd/lib/uhd_single_usrp_sink.h
+++ b/gr-uhd/lib/uhd_single_usrp_sink.h
@@ -29,7 +29,8 @@ class uhd_single_usrp_sink;
 
 boost::shared_ptr<uhd_single_usrp_sink> uhd_make_single_usrp_sink(
     const std::string &args,
-    const uhd::io_type_t::tid_t &type
+    const uhd::io_type_t::tid_t &type,
+    size_t num_channels = 1
 );
 
 class uhd_single_usrp_sink : public gr_sync_block{
diff --git a/gr-uhd/lib/uhd_single_usrp_source.cc b/gr-uhd/lib/uhd_single_usrp_source.cc
index 13e4d6d43c..5da4385b25 100644
--- a/gr-uhd/lib/uhd_single_usrp_source.cc
+++ b/gr-uhd/lib/uhd_single_usrp_source.cc
@@ -39,8 +39,9 @@ class uhd_single_usrp_source_impl : public uhd_single_usrp_source{
 public:
     uhd_single_usrp_source_impl(
         const std::string &args,
-        const uhd::io_type_t &type
-    ) : uhd_single_usrp_source(gr_make_io_signature(1, 1, type.size)), _type(type)
+        const uhd::io_type_t &type,
+        size_t num_channels
+    ) : uhd_single_usrp_source(gr_make_io_signature(num_channels, num_channels, type.size)), _type(type)
     {
         _dev = uhd::usrp::single_usrp::make(args);
         set_streaming(false);
@@ -157,9 +158,10 @@ private:
  **********************************************************************/
 boost::shared_ptr<uhd_single_usrp_source> uhd_make_single_usrp_source(
     const std::string &args,
-    const uhd::io_type_t::tid_t &type
+    const uhd::io_type_t::tid_t &type,
+    size_t num_channels
 ){
     return boost::shared_ptr<uhd_single_usrp_source>(
-        new uhd_single_usrp_source_impl(args, type)
+        new uhd_single_usrp_source_impl(args, type, num_channels)
     );
 }
diff --git a/gr-uhd/lib/uhd_single_usrp_source.h b/gr-uhd/lib/uhd_single_usrp_source.h
index 5da7e2b9ab..196b7c6759 100644
--- a/gr-uhd/lib/uhd_single_usrp_source.h
+++ b/gr-uhd/lib/uhd_single_usrp_source.h
@@ -29,7 +29,8 @@ class uhd_single_usrp_source;
 
 boost::shared_ptr<uhd_single_usrp_source> uhd_make_single_usrp_source(
     const std::string &args,
-    const uhd::io_type_t::tid_t &type
+    const uhd::io_type_t::tid_t &type,
+    size_t num_channels = 1
 );
 
 class uhd_single_usrp_source : public gr_sync_block{