X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;f=tos%2Flib%2Fftsp%2FTimeSyncMsg.h;h=74a90197ae601cb5e77a9f15c91c38406ab74902;hb=e9bfab607e051bae6afb47b44892ce37541d1b44;hp=bf5830a77334d57a05ab60ec223ef723ae6ee7db;hpb=1487f209aa37c20dc0a7a91593ebbf44410dd030;p=tinyos-2.x.git

diff --git a/tos/lib/ftsp/TimeSyncMsg.h b/tos/lib/ftsp/TimeSyncMsg.h
index bf5830a7..74a90197 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
@@ -43,7 +49,7 @@ typedef nx_struct TimeSyncMsg
 } TimeSyncMsg;
 
 enum {
-    AM_TIMESYNCMSG = 0xAA,
+    TIMESYNC_AM_FTSP = 0x3E,
     TIMESYNCMSG_LEN = sizeof(TimeSyncMsg) - sizeof(nx_uint32_t),
     TS_TIMER_MODE = 0,      // see TimeSyncMode interface
     TS_USER_MODE = 1,       // see TimeSyncMode interface