From: Sylvain Munaut <tnt@246tNt.com>
Date: Thu, 23 Sep 2010 19:05:18 +0000 (+0200)
Subject: [WIP] Ugly hack to compensate lost time on TS change (high TS -> low TS)
X-Git-Url: http://git.rot13.org/?a=commitdiff_plain;h=48bc8877b5b1811d2aa0b5491683c6b540d16611;p=osmocom-bb.git

[WIP] Ugly hack to compensate lost time on TS change (high TS -> low TS)

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
---

diff --git a/src/target/firmware/layer1/sync.c b/src/target/firmware/layer1/sync.c
index 3397dc0..150205f 100644
--- a/src/target/firmware/layer1/sync.c
+++ b/src/target/firmware/layer1/sync.c
@@ -189,6 +189,7 @@ static int last_timestamp;
 
 static inline void check_lost_frame(void)
 {
+	static int last_ts = -1;
 	int diff, timestamp = hwtimer_read(1);
 
 	if (last_timestamp < timestamp)
@@ -196,6 +197,22 @@ static inline void check_lost_frame(void)
 
 	diff = last_timestamp - timestamp;
 
+	/* TS change compensation */
+	if (l1s.dedicated.type) {
+		if (l1s.dedicated.tn < last_ts) {
+			int ediff = ((8 - last_ts + l1s.dedicated.tn) * TIMER_TICKS_PER_TDMA) >> 3;
+			printf("TS Chg: %d -> %d | %d %d\n",
+				last_ts, l1s.dedicated.tn, diff, ediff);
+
+	//		if (((ediff - 2) < diff) && ((ediff + 2) > diff)) {
+				puts("ADV !\n");
+				l1s.current_time = l1s.next_time;
+				l1s_time_inc(&l1s.next_time, 1);
+	//		}
+		}
+		last_ts = l1s.dedicated.tn;
+	}
+
 	/* allow for a bit of jitter */
 	if (diff < TIMER_TICKS_PER_TDMA - TIMER_TICK_JITTER ||
 	    diff > TIMER_TICKS_PER_TDMA + TIMER_TICK_JITTER)