From 9ba4e07b16bf5efa450f9ab3b9f1eaa937d54a82 Mon Sep 17 00:00:00 2001
From: markster <markster@5390a7c7-147a-4af0-8ec9-7488f05a26cb>
Date: Sat, 17 Aug 2002 00:28:51 +0000
Subject: Version 0.3.0 from FTP

git-svn-id: http://svn.digium.com/svn/zaptel/trunk@98 5390a7c7-147a-4af0-8ec9-7488f05a26cb
---
 tor2.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

(limited to 'tor2.c')

diff --git a/tor2.c b/tor2.c
index fbe7c37..8e1879a 100755
--- a/tor2.c
+++ b/tor2.c
@@ -103,6 +103,8 @@ struct tor2 {
 	int spansstarted;		/* number of spans started */
 	spinlock_t lock;		/* lock context */
 	unsigned char leds;		/* copy of LED register */
+	unsigned char ec_chunk1[4][32][ZT_CHUNKSIZE]; /* first EC chunk buffer */
+	unsigned char ec_chunk2[4][32][ZT_CHUNKSIZE]; /* second EC chunk buffer */
 #ifdef ENABLE_TASKLETS
 	int taskletrun;
 	int taskletsched;
@@ -707,11 +709,18 @@ static int tor2_startup(struct zt_span *span)
 		return -1;
 	}
 
-
 	spin_lock_irqsave(&p->tor->lock, flags);
 
 	alreadyrunning = span->flags & ZT_FLAG_RUNNING;
 
+	/* initialize the start value for the entire chunk of last ec buffer */
+	for(i = 0; i < span->channels; i++)
+	{
+		memset(p->tor->ec_chunk1[p->span][i],
+			ZT_LIN2X(0,&span->chans[i]),ZT_CHUNKSIZE);
+		memset(p->tor->ec_chunk2[p->span][i],
+			ZT_LIN2X(0,&span->chans[i]),ZT_CHUNKSIZE);
+	}
 	if (p->tor->cardtype == TYPE_E1) { /* if this is an E1 card */
 		unsigned char tcr1,ccr1;
 		if (!alreadyrunning) {
@@ -937,11 +946,18 @@ static inline void tor2_run(struct tor2 *tor)
 	int x,y;
 	for (x=0;x<4;x++) {
 		if (tor->spans[x].flags & ZT_FLAG_RUNNING) {
+			/* since the Tormenta 2 PCI is double-buffered, you
+			   need to delay the transmit data 2 entire chunks so
+			   that the transmit will be in sync with the receive */
 			for (y=0;y<tor->spans[x].channels;y++) {
-				/* XXX Technically, we're wasting 8 taps of echo canceller
-				   because we're cancelling against something that won't be sent
-				   until the next chunk XXX */
-				zt_ec_chunk(&tor->spans[x].chans[y], tor->spans[x].chans[y].readchunk, tor->spans[x].chans[y].writechunk);
+				zt_ec_chunk(&tor->spans[x].chans[y], 
+				    tor->spans[x].chans[y].readchunk, 
+					tor->ec_chunk2[x][y]);
+				memcpy(tor->ec_chunk2[x][y],tor->ec_chunk1[x][y],
+					ZT_CHUNKSIZE);
+				memcpy(tor->ec_chunk1[x][y],
+					tor->spans[x].chans[y].writechunk,
+						ZT_CHUNKSIZE);
 			}
 			zt_receive(&tor->spans[x]);
 		}
-- 
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