From e20160b7cc480176ba629ebfbe9fb073963c25d3 Mon Sep 17 00:00:00 2001
From: Johnathan Corgan
Date: Sat, 19 Jun 2010 11:27:56 -0700
Subject: gr-usrp2: implement start_streaming_at(usrp2::fpga_timestamp time)

This new method on usrp2.sink_* causes the first TX sample data to be
sent at the FPGA clock time specified, with all further data immediately
following.

u = usrp2.sink_32fc() # or 16sc
...configure sink here...
u.sync_to_pps()
...delay a second for PPS to have happened
u.start_streaming_at(int(100e6)) # start TX stream one second later
...start flowgraph here...

If this function is not called, all transmit data will be sent
immediately (the prior behavior).
---
 gr-usrp2/src/usrp2_sink_base.cc | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'gr-usrp2/src/usrp2_sink_base.cc')

diff --git a/gr-usrp2/src/usrp2_sink_base.cc b/gr-usrp2/src/usrp2_sink_base.cc
index ce473f236..c9b34a54a 100644
--- a/gr-usrp2/src/usrp2_sink_base.cc
+++ b/gr-usrp2/src/usrp2_sink_base.cc
@@ -36,7 +36,9 @@ usrp2_sink_base::usrp2_sink_base(const char *name,
   : usrp2_base(name,
                input_signature,
 	       gr_make_io_signature(0, 0, 0),
-	       ifc, mac)
+	       ifc, mac),
+    d_should_wait(false),
+    d_tx_time(0)
 {
   // NOP
 }
@@ -155,3 +157,10 @@ bool usrp2_sink_base::read_gpio(uint16_t *value)
 {
   return d_u2->read_gpio(usrp2::GPIO_TX_BANK, value);
 }
+
+bool usrp2_sink_base::start_streaming_at(usrp2::fpga_timestamp time)
+{
+  d_should_wait = true;
+  d_tx_time = time;
+  return true;
+}
-- 
cgit