usrp1: changes that make benchmark rx work

initialize the time to something in soft time control

use std::max(0, lost) because the time is emulated, lost can be negative which means huge positive unsigned...

2 files changed, 5 insertions, 1 deletions

diff --git a/host/examples/benchmark_rx_rate.cpp b/host/examples/benchmark_rx_rate.cpp
index c49d8bff0..c993af970 100644
--- a/host/examples/benchmark_rx_rate.cpp
+++ b/host/examples/benchmark_rx_rate.cpp
@@ -89,7 +89,8 @@ static inline void test_device(
             got_first_packet = true;
         }
 
-        total_lost_samples += boost::math::iround(rx_rate_sps*(md.time_spec - next_expected_time_spec).get_real_secs());
+        double approx_lost_samps = rx_rate_sps*(md.time_spec - next_expected_time_spec).get_real_secs();
+        total_lost_samples += std::max(0, boost::math::iround(approx_lost_samps));
         next_expected_time_spec = md.time_spec + uhd::time_spec_t(0, num_rx_samps, rx_rate_sps);
 
     } while((next_expected_time_spec - initial_time_spec) < uhd::time_spec_t(duration_secs));
diff --git a/host/lib/usrp/usrp1/soft_time_ctrl.cpp b/host/lib/usrp/usrp1/soft_time_ctrl.cpp
index 856faf89d..c91ecc7ed 100644
--- a/host/lib/usrp/usrp1/soft_time_ctrl.cpp
+++ b/host/lib/usrp/usrp1/soft_time_ctrl.cpp
@@ -69,6 +69,9 @@ public:
         _thread_group.create_thread(boost::bind(&soft_time_ctrl_impl::recv_cmd_dispatcher, this));
         _update_mutex.lock(); //lock blocks until spawned
         _update_mutex.unlock(); //unlock mutex before done
+
+        //initialize the time to something
+        this->set_time(time_spec_t(0.0));
     }
 
     ~soft_time_ctrl_impl(void){