multi_usrp: Add set_rx_spp() call

This API call is a more explicit way of setting the spp than passing in
an spp value in the args of the stream args when creating streamers. For
pre-RFNoC devices, this is done by injecting the spp arg back into the
stream args. For RFNoC devices, the set_property() call on the radio is
called.

1 files changed, 18 insertions, 1 deletions

diff --git a/host/lib/usrp/multi_usrp.cpp b/host/lib/usrp/multi_usrp.cpp
index 6dad00787..1b39a2827 100644
--- a/host/lib/usrp/multi_usrp.cpp
+++ b/host/lib/usrp/multi_usrp.cpp
@@ -961,7 +961,16 @@ public:
      ******************************************************************/
     rx_streamer::sptr get_rx_stream(const stream_args_t &args) {
         _check_link_rate(args, false);
-        return this->get_device()->get_rx_stream(args);
+        stream_args_t args_ = args;
+        if (!args.args.has_key("spp")) {
+            for (auto chan : args.channels) {
+                if (_rx_spp.count(chan)) {
+                    args_.args.set("spp", std::to_string(_rx_spp.at(chan)));
+                    break;
+                }
+            }
+        }
+        return this->get_device()->get_rx_stream(args_);
     }
 
     void set_rx_subdev_spec(const subdev_spec_t &spec, size_t mboard){
@@ -1018,6 +1027,11 @@ public:
         }
     }
 
+    void set_rx_spp(const size_t spp, const size_t chan = ALL_CHANS)
+    {
+        _rx_spp[chan] = spp;
+    }
+
     double get_rx_rate(size_t chan){
         return _tree->access<double>(rx_dsp_root(chan) / "rate" / "value").get();
     }
@@ -2258,6 +2272,9 @@ private:
     device::sptr _dev;
     property_tree::sptr _tree;
 
+    //! Container for spp values set in set_rx_spp()
+    std::unordered_map<size_t, size_t> _rx_spp;
+
     struct mboard_chan_pair{
         size_t mboard, chan;
         mboard_chan_pair(void): mboard(0), chan(0){}