Send the number of samples per datagram over the control.

Worked on the io impl for usrp2 (added loop unrolls and 32 bit buffers).
Added some vrt rx constants to the fw common used by host and fw.
Removed the MTU prop and added a general device prop for num samples.

1 files changed, 10 insertions, 6 deletions

diff --git a/host/lib/usrp/usrp2/dsp_impl.cpp b/host/lib/usrp/usrp2/dsp_impl.cpp
index e5c4a4245..a57f5ff2d 100644
--- a/host/lib/usrp/usrp2/dsp_impl.cpp
+++ b/host/lib/usrp/usrp2/dsp_impl.cpp
@@ -48,7 +48,7 @@ void usrp2_impl::init_ddc_config(void){
     );
 
     //initial config and update
-    _ddc_decim = 16;
+    _ddc_decim = 64;
     _ddc_freq = 0;
     update_ddc_config();
 
@@ -82,6 +82,12 @@ void usrp2_impl::update_ddc_enabled(void){
     out_data.data.streaming.enabled = (_ddc_enabled)? 1 : 0;
     out_data.data.streaming.secs =  htonl(_ddc_stream_at.secs);
     out_data.data.streaming.ticks = htonl(_ddc_stream_at.ticks);
+    out_data.data.streaming.samples = htonl(
+        _mtu/sizeof(uint32_t) -
+        USRP2_HOST_RX_VRT_HEADER_WORDS32 -
+        USRP2_HOST_RX_VRT_TRAILER_WORDS32 -
+        ((2 + 14 + 20 + 8)/sizeof(uint32_t)) //size of headers (pad, eth, ip, udp)
+    );
 
     //send and recv
     usrp2_ctrl_data_t in_data = ctrl_send_and_recv(out_data);
@@ -151,8 +157,7 @@ void usrp2_impl::ddc_set(const wax::obj &key, const wax::obj &val){
     if (key_name == "decim"){
         size_t new_decim = wax::cast<size_t>(val);
         ASSERT_THROW(std::has(
-            _allowed_decim_and_interp_rates.begin(),
-            _allowed_decim_and_interp_rates.end(),
+            _allowed_decim_and_interp_rates,
             new_decim
         ));
         _ddc_decim = new_decim; //shadow
@@ -196,7 +201,7 @@ void usrp2_impl::init_duc_config(void){
     );
 
     //initial config and update
-    _duc_interp = 16;
+    _duc_interp = 64;
     _duc_freq = 0;
     update_duc_config();
 }
@@ -280,8 +285,7 @@ void usrp2_impl::duc_set(const wax::obj &key, const wax::obj &val){
     if (key_name == "interp"){
         size_t new_interp = wax::cast<size_t>(val);
         ASSERT_THROW(std::has(
-            _allowed_decim_and_interp_rates.begin(),
-            _allowed_decim_and_interp_rates.end(),
+            _allowed_decim_and_interp_rates,
             new_interp
         ));
         _duc_interp = new_interp; //shadow