Added timed control commands to test_timed_commands example. Added radio core as subscriber to tick rate change for B200.

2 files changed, 37 insertions, 6 deletions

diff --git a/host/examples/test_timed_commands.cpp b/host/examples/test_timed_commands.cpp
index 10336ec34..8c6011c68 100644
--- a/host/examples/test_timed_commands.cpp
+++ b/host/examples/test_timed_commands.cpp
@@ -78,9 +78,40 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
         total_time += (t1-t0);
     }
     std::cout << boost::format(
-        "Difference between paired reads: %f us"
+        " Difference between paired reads: %f us"
     ) % (total_time.get_real_secs()/100*1e6) << std::endl;
 
+    //test timed control command
+    //issues get_time_now() command twice a fixed time apart
+    //outputs difference for each response time vs. the expected time
+    //and difference between actual and expected time deltas
+    std::cout << std::endl;
+    std::cout << "Testing control timed command:" << std::endl;
+    const uhd::time_spec_t span = uhd::time_spec_t(0.1);
+    const uhd::time_spec_t now = usrp->get_time_now();
+    const uhd::time_spec_t cmd_time1 = now + uhd::time_spec_t(0.1);
+    const uhd::time_spec_t cmd_time2 = cmd_time1 + span;
+    usrp->set_command_time(cmd_time1);
+    uhd::time_spec_t response_time1 = usrp->get_time_now();
+    usrp->set_command_time(cmd_time2);
+    uhd::time_spec_t response_time2 = usrp->get_time_now();
+    usrp->clear_command_time();
+    std::cout << boost::format(
+        " Span      : %f us\n"
+        " Now       : %f us\n"
+        " Response 1: %f us\n"
+        " Response 2: %f us"
+    ) % (span.get_real_secs()*1e6) % (now.get_real_secs()*1e6) % (response_time1.get_real_secs()*1e6) % (response_time2.get_real_secs()*1e6) << std::endl;
+    std::cout << boost::format(
+        " Difference of response time 1: %f us"
+    ) % ((response_time1 - cmd_time1).get_real_secs()*1e6) << std::endl;
+    std::cout << boost::format(
+        " Difference of response time 2: %f us"
+    ) % ((response_time2 - cmd_time2).get_real_secs()*1e6) << std::endl;
+    std::cout << boost::format(
+        " Difference between actual and expected time delta: %f us"
+    ) % ((response_time2 - response_time1 - span).get_real_secs()*1e6) << std::endl;
+
     //use a timed command to start a stream at a specific time
     //this is not the right way start streaming at time x,
     //but it should approximate it within control RTT/2
@@ -96,10 +127,8 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
     stream_cmd.num_samps = 100;
     stream_cmd.stream_now = false;
     const uhd::time_spec_t stream_time = usrp->get_time_now() + uhd::time_spec_t(0.1);
-    usrp->set_command_time(stream_time);
     stream_cmd.time_spec = stream_time;
     rx_stream->issue_stream_cmd(stream_cmd);
-    usrp->clear_command_time();
 
     //meta-data will be filled in by recv()
     uhd::rx_metadata_t md;
@@ -114,13 +143,13 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
         ) % md.error_code));
     }
     std::cout << boost::format(
-        "Received packet: %u samples, %u full secs, %f frac secs"
+        " Received packet: %u samples, %u full secs, %f frac secs"
     ) % num_rx_samps % md.time_spec.get_full_secs() % md.time_spec.get_frac_secs() << std::endl;
     std::cout << boost::format(
-        "Stream time was: %u full secs, %f frac secs"
+        " Stream time was: %u full secs, %f frac secs"
     ) % stream_time.get_full_secs() % stream_time.get_frac_secs() << std::endl;
     std::cout << boost::format(
-        "Difference between stream time and first packet: %f us"
+        " Difference between stream time and first packet: %f us"
     ) % ((md.time_spec-stream_time).get_real_secs()*1e6) << std::endl;
 
     //finished
diff --git a/host/lib/usrp/b200/b200_impl.cpp b/host/lib/usrp/b200/b200_impl.cpp
index 132b1198d..ab437af6b 100644
--- a/host/lib/usrp/b200/b200_impl.cpp
+++ b/host/lib/usrp/b200/b200_impl.cpp
@@ -501,6 +501,8 @@ void b200_impl::setup_radio(const size_t dspno)
     _async_task_data->radio_ctrl[dspno] = perif.ctrl; //weak
     _tree->access<time_spec_t>(mb_path / "time" / "cmd")
         .subscribe(boost::bind(&radio_ctrl_core_3000::set_time, perif.ctrl, _1));
+    _tree->access<double>(mb_path / "tick_rate")
+        .subscribe(boost::bind(&radio_ctrl_core_3000::set_tick_rate, perif.ctrl, _1));
     this->register_loopback_self_test(perif.ctrl);
     perif.atr = gpio_core_200_32wo::make(perif.ctrl, TOREG(SR_ATR));