X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;f=tos%2Flib%2Fftsp%2FTimeSyncMsg.h;h=f45c2b346f68aa5da56be9b38f2d833f1b5fb66c;hb=c2446e77b000475fd96907b3c3e12ec1fd90c3ab;hp=a9e6e393e57c5a3e250f2e545fea7a319fda2cb0;hpb=b34c3d8bdc4a0e98a0ba9ec200d392a89a50ea6d;p=tinyos-2.x.git

diff --git a/tos/lib/ftsp/TimeSyncMsg.h b/tos/lib/ftsp/TimeSyncMsg.h
index a9e6e393..f45c2b34 100644
--- a/tos/lib/ftsp/TimeSyncMsg.h
+++ b/tos/lib/ftsp/TimeSyncMsg.h
@@ -32,10 +32,16 @@ typedef nx_struct TimeSyncMsg
 	nx_uint16_t	nodeID;		// the node if of the sender
 	nx_uint8_t	seqNum;		// sequence number for the root
 
-	/* This field is initially set to the offset between global time and local
-	 * time. The TimeStamping component will add the current local time when the
-	 * message is actually transmitted. Thus the receiver will receive the
-	 * global time of the sender when the message is actually sent. */
+	/*
+	* After TEP 133, the message timestamp contains the difference between
+	* event time and the time the message was actually sent out. TimeSyncP
+	* sends the local time associated with this globalTime to the
+	* TimeStamping mechanism, which then calculates the difference.
+	*
+	* On the receiving side, the difference is applied to the local
+	* timestamp. The receiving timestamp thus represents the time on the
+	* receiving clock when the remote globalTime was taken.
+	*/
 	nx_uint32_t	globalTime;
 
 	//just for convenience