Remove filler table from calypso BTS

It is still not required to transmit dummy bursts, synchronization bursts
and frequency correction bursts. If they are not provided by the
transceiver, they are filled automatically, depending on current slot
configuration.

2 files changed, 21 insertions, 61 deletions

diff --git a/src/target/firmware/apps/trx/trx.c b/src/target/firmware/apps/trx/trx.c
index 8e5c89f7..e15da87b 100644
--- a/src/target/firmware/apps/trx/trx.c
+++ b/src/target/firmware/apps/trx/trx.c
@@ -35,54 +35,15 @@
 /* Burst queue */
 BURST_QUEUE_STATIC(g_bq, 8, 512, static)
 
-/* Filler table */
-static struct burst_data fill[8][52];
-static uint8_t fill_size[8];
-
 
 /* TRX Helpers **************************************************************/
 
 static void
-trx_init_filler(uint8_t tn, uint8_t type)
+trx_discarded_burst(__unused struct burst_data *burst,
+                    __unused int head, uint32_t fn, __unused void *data)
 {
-	int i;
-
-	if ((type >> 1) == 2) {
-		for (i=0; i<51; i++) {
-			if ((i % 51) == 50)
-				fill[tn][i].type = BURST_DUMMY;
-			else if (((i % 51) % 10) == 0)
-				fill[tn][i].type = BURST_FB;
-			else if (((i % 51) % 10) == 1)
-				fill[tn][i].type = BURST_SB;
-			else
-				fill[tn][i].type = BURST_DUMMY;
-		}
-		fill_size[tn] = 51;
-	} else if ((type >> 1) == 3) {
-		for (i=0; i<51; i++)
-			fill[tn][i].type = BURST_DUMMY;
-		fill_size[tn] = 51;
-	} else {
-		for (i=0; i<52; i++)
-			fill[tn][i].type = BURST_DUMMY;
-		fill_size[tn] = 52;
-	}
-}
-
-static void
-trx_discarded_burst(struct burst_data *burst,
-                    int head, uint32_t fn, uint8_t tn, __unused void *data)
-{
-	/* Only TN=0 */
-	if (head)
-		return;
-
 	/* Debug */
 	printf("STALE BURST %" PRIu32 "\n", fn);
-
-	/* Still copy to the filler table */
-	memcpy(&fill[tn][fn % fill_size[tn]], burst, sizeof(struct burst_data));
 }
 
 
@@ -91,15 +52,9 @@ trx_discarded_burst(struct burst_data *burst,
 void
 trx_init(void)
 {
-	int i;
-
 	/* Init burst queue */
 	bq_reset(&g_bq);
 	bq_set_discard_fn(&g_bq, trx_discarded_burst, NULL);
-
-	/* Init filler table */
-	for (i = 0; i < 8; i++)
-		trx_init_filler(i, l1s.bts.type[i]);
 }
 
 int
@@ -134,19 +89,25 @@ trx_get_burst(uint32_t fn, uint8_t tn, uint8_t *data)
 	burst = bq_pop_head(&g_bq, tn, fn);
 
 	if (burst) {
-		/* New burst: Copy to fill table & use it */
-		memcpy(&fill[tn][fn % fill_size[tn]], burst,
-			sizeof(struct burst_data));
-
-		// printf("O %d %d %p\n", fn, g_bq.used, burst);
-	} else {
-		/* No data, just use the one from fill table */
-		burst = &fill[tn][fn % fill_size[tn]];
-	}
+		rc = burst->type;
+		if (burst->type == BURST_NB)
+			memcpy(data, burst->data, 15);
 
-	rc = burst->type;
-	if (burst->type == BURST_NB)
-		memcpy(data, burst->data, 15);
+		return rc;
+	}
 
-	return rc;
+	/* no burst, use dummy on non BCCH */
+	if ((l1s.bts.type[tn] >> 1) != 2)
+		return BURST_DUMMY;
+
+	/* no burst, use dummy,FCCH,SCH on BCCH */
+	fn = fn % 51;
+	if (fn == 50)
+		return BURST_DUMMY;
+	fn = fn % 10;
+	if (fn == 0)
+		return BURST_FB;
+	if (fn == 1)
+		return BURST_SB;
+	return BURST_DUMMY;
 }
diff --git a/src/target/firmware/layer1/l23_api.c b/src/target/firmware/layer1/l23_api.c
index e8ebd9c7..85031159 100644
--- a/src/target/firmware/layer1/l23_api.c
+++ b/src/target/firmware/layer1/l23_api.c
@@ -649,7 +649,6 @@ static int l1ctl_bts_mode(struct msgb *msg)
 		mframe_enable(MF_TASK_BTS);
 		for (i = 0; i < 8; i++)
 			l1s.bts.type[i] = bm->type[i];
-		trx_init();
 		l1s.bts.gain = bm->gain;
 
 		/* Calculate TX and RX windows by bit masks */