Split metadata into rx and tx specific metadata.

The rx metadata has fragment flags and the tx metatdata has burst flags.
Made the io impl for usrp2 rx routine fill in the rx metatdata fragment flag.
Added device documentation for send and recv in regards to fragmentation.

2 files changed, 16 insertions, 10 deletions

diff --git a/host/lib/usrp/usrp2/io_impl.cpp b/host/lib/usrp/usrp2/io_impl.cpp
index 642b6b08b..5529cfe57 100644
--- a/host/lib/usrp/usrp2/io_impl.cpp
+++ b/host/lib/usrp/usrp2/io_impl.cpp
@@ -119,7 +119,7 @@ static inline void usrp2_items_to_host_items(
 /***********************************************************************
  * Receive Raw Data
  **********************************************************************/
-void usrp2_impl::recv_raw(uhd::metadata_t &metadata){
+void usrp2_impl::recv_raw(rx_metadata_t &metadata){
     //do a receive
     _rx_smart_buff = _data_transport->recv();
 
@@ -161,8 +161,8 @@ void usrp2_impl::recv_raw(uhd::metadata_t &metadata){
  * Send Data
  **********************************************************************/
 size_t usrp2_impl::send(
-    const boost::asio::const_buffer &buff,
-    const uhd::metadata_t &metadata,
+    const asio::const_buffer &buff,
+    const tx_metadata_t &metadata,
     const std::string &type
 ){
     uint32_t tx_mem[_mtu/sizeof(uint32_t)];
@@ -210,13 +210,19 @@ size_t usrp2_impl::send(
  * Receive Data
  **********************************************************************/
 size_t usrp2_impl::recv(
-    const boost::asio::mutable_buffer &buff,
-    uhd::metadata_t &metadata,
+    const asio::mutable_buffer &buff,
+    rx_metadata_t &metadata,
     const std::string &type
 ){
     //perform a receive if no rx data is waiting to be copied
-    if (asio::buffer_size(_rx_copy_buff) == 0) recv_raw(metadata);
-    //TODO otherwise flag the metadata to show that is is a fragment
+    if (asio::buffer_size(_rx_copy_buff) == 0){
+        recv_raw(metadata);
+    }
+    //otherwise flag the metadata to show that is is a fragment
+    else{
+        metadata = rx_metadata_t();
+        metadata.is_fragment = true;
+    }
 
     //extract the number of samples available to copy
     //and a pointer into the usrp2 received items memory
diff --git a/host/lib/usrp/usrp2/usrp2_impl.hpp b/host/lib/usrp/usrp2/usrp2_impl.hpp
index 083ad7096..f4e6054bd 100644
--- a/host/lib/usrp/usrp2/usrp2_impl.hpp
+++ b/host/lib/usrp/usrp2/usrp2_impl.hpp
@@ -100,12 +100,12 @@ public:
     double get_master_clock_freq(void);
 
     //the io interface
-    size_t send(const boost::asio::const_buffer &, const uhd::metadata_t &, const std::string &);
-    size_t recv(const boost::asio::mutable_buffer &, uhd::metadata_t &, const std::string &);
+    size_t send(const boost::asio::const_buffer &, const uhd::tx_metadata_t &, const std::string &);
+    size_t recv(const boost::asio::mutable_buffer &, uhd::rx_metadata_t &, const std::string &);
 
 private:
     //the raw io interface (samples are in the usrp2 native format)
-    void recv_raw(uhd::metadata_t &);
+    void recv_raw(uhd::rx_metadata_t &);
     uhd::dict<uint32_t, size_t> _tx_stream_id_to_packet_seq;
     uhd::dict<uint32_t, size_t> _rx_stream_id_to_packet_seq;
     static const size_t _mtu = 1500; //FIXME we have no idea