ta_control: move timing advance code from osmo-bts-trx to common

The timing advance controller that is implemented in loops.c of
osmo-bts-trx only works for osmo-bts-trx and not for any of the phy
based bts. Lets move the timing advance controller into the common part
and make it available for every bts. Also lets add a unit-test.

Change-Id: If7ddf74db3abc9b9872abe620a0aeebe3327e70a
Related: SYS#4567

5 files changed, 699 insertions, 1 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 1eb28d6f..57687eef 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,4 +1,4 @@
-SUBDIRS = paging cipher agch misc handover tx_power power meas
+SUBDIRS = paging cipher agch misc handover tx_power power meas ta_control
 
 if ENABLE_SYSMOBTS
 SUBDIRS += sysmobts
diff --git a/tests/ta_control/Makefile.am b/tests/ta_control/Makefile.am
new file mode 100644
index 00000000..4c89dd29
--- /dev/null
+++ b/tests/ta_control/Makefile.am
@@ -0,0 +1,6 @@
+AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
+AM_CFLAGS = -Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOCODEC_CFLAGS) $(LIBOSMOTRAU_CFLAGS) $(LIBOSMOABIS_CFLAGS)
+LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOCODEC_LIBS) $(LIBOSMOTRAU_LIBS) $(LIBOSMOABIS_LIBS)
+noinst_PROGRAMS = ta_control_test
+EXTRA_DIST = ta_control_test.ok
+ta_control_test_LDADD = $(top_builddir)/src/common/libbts.a $(LDADD)
diff --git a/tests/ta_control/ta_control_test.c b/tests/ta_control/ta_control_test.c
new file mode 100644
index 00000000..2e981b38
--- /dev/null
+++ b/tests/ta_control/ta_control_test.c
@@ -0,0 +1,77 @@
+/* Test cases for tx_control.c Timing Advance Computation */
+
+/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Philipp Maier
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/application.h>
+#include <osmo-bts/logging.h>
+#include <osmo-bts/gsm_data.h>
+#include <osmo-bts/ta_control.h>
+
+void lchan_ms_ta_ctrl_test(int16_t toa256_start, unsigned int steps)
+{
+	struct gsm_lchan lchan = { };
+	unsigned int i;
+	uint8_t rqd_ta_after;
+	uint8_t rqd_ta_before;
+	int16_t toa256 = toa256_start;
+
+	/* Arbitrary value, high enough so that a computation can happen. */
+	lchan.meas.num_ul_meas = 10;
+
+	printf("toa256_start = %u / 256 = %u, steps = %u\n", toa256_start,
+	       toa256_start / 256, steps);
+
+	for (i = 0; i < steps; i++) {
+		printf("Step #%u\n", i);
+		printf("  lchan.rqd_ta (before) = %u\n", lchan.rqd_ta);
+		printf("  toa256 (before) = %u / 256 = %u\n", toa256,
+		       toa256 / 256);
+
+		rqd_ta_before = lchan.rqd_ta;
+
+		lchan.meas.ms_toa256 = toa256;
+		lchan_ms_ta_ctrl(&lchan);
+
+		rqd_ta_after = lchan.rqd_ta;
+		toa256 -= (rqd_ta_after - rqd_ta_before) * 256;
+
+		printf("  lchan.rqd_ta (after) = %u\n", lchan.rqd_ta);
+		printf("  toa256 (after) = %u / 256 = %u\n", toa256,
+		       toa256 / 256);
+	}
+
+	printf("Done.\n");
+	printf("\n");
+}
+
+int main(int argc, char **argv)
+{
+	void *tall_bts_ctx;
+
+	tall_bts_ctx = talloc_named_const(NULL, 1, "OsmoBTS context");
+	osmo_init_logging2(tall_bts_ctx, &bts_log_info);
+
+	lchan_ms_ta_ctrl_test(16 * 256, 20);
+	lchan_ms_ta_ctrl_test(4000, 50);
+	lchan_ms_ta_ctrl_test(12345, 50);
+}
diff --git a/tests/ta_control/ta_control_test.ok b/tests/ta_control/ta_control_test.ok
new file mode 100644
index 00000000..8ebe5d54
--- /dev/null
+++ b/tests/ta_control/ta_control_test.ok
@@ -0,0 +1,609 @@
+toa256_start = 4096 / 256 = 16, steps = 20
+Step #0
+  lchan.rqd_ta (before) = 0
+  toa256 (before) = 4096 / 256 = 16
+  lchan.rqd_ta (after) = 1
+  toa256 (after) = 3840 / 256 = 15
+Step #1
+  lchan.rqd_ta (before) = 1
+  toa256 (before) = 3840 / 256 = 15
+  lchan.rqd_ta (after) = 2
+  toa256 (after) = 3584 / 256 = 14
+Step #2
+  lchan.rqd_ta (before) = 2
+  toa256 (before) = 3584 / 256 = 14
+  lchan.rqd_ta (after) = 3
+  toa256 (after) = 3328 / 256 = 13
+Step #3
+  lchan.rqd_ta (before) = 3
+  toa256 (before) = 3328 / 256 = 13
+  lchan.rqd_ta (after) = 4
+  toa256 (after) = 3072 / 256 = 12
+Step #4
+  lchan.rqd_ta (before) = 4
+  toa256 (before) = 3072 / 256 = 12
+  lchan.rqd_ta (after) = 5
+  toa256 (after) = 2816 / 256 = 11
+Step #5
+  lchan.rqd_ta (before) = 5
+  toa256 (before) = 2816 / 256 = 11
+  lchan.rqd_ta (after) = 6
+  toa256 (after) = 2560 / 256 = 10
+Step #6
+  lchan.rqd_ta (before) = 6
+  toa256 (before) = 2560 / 256 = 10
+  lchan.rqd_ta (after) = 7
+  toa256 (after) = 2304 / 256 = 9
+Step #7
+  lchan.rqd_ta (before) = 7
+  toa256 (before) = 2304 / 256 = 9
+  lchan.rqd_ta (after) = 8
+  toa256 (after) = 2048 / 256 = 8
+Step #8
+  lchan.rqd_ta (before) = 8
+  toa256 (before) = 2048 / 256 = 8
+  lchan.rqd_ta (after) = 9
+  toa256 (after) = 1792 / 256 = 7
+Step #9
+  lchan.rqd_ta (before) = 9
+  toa256 (before) = 1792 / 256 = 7
+  lchan.rqd_ta (after) = 10
+  toa256 (after) = 1536 / 256 = 6
+Step #10
+  lchan.rqd_ta (before) = 10
+  toa256 (before) = 1536 / 256 = 6
+  lchan.rqd_ta (after) = 11
+  toa256 (after) = 1280 / 256 = 5
+Step #11
+  lchan.rqd_ta (before) = 11
+  toa256 (before) = 1280 / 256 = 5
+  lchan.rqd_ta (after) = 12
+  toa256 (after) = 1024 / 256 = 4
+Step #12
+  lchan.rqd_ta (before) = 12
+  toa256 (before) = 1024 / 256 = 4
+  lchan.rqd_ta (after) = 13
+  toa256 (after) = 768 / 256 = 3
+Step #13
+  lchan.rqd_ta (before) = 13
+  toa256 (before) = 768 / 256 = 3
+  lchan.rqd_ta (after) = 14
+  toa256 (after) = 512 / 256 = 2
+Step #14
+  lchan.rqd_ta (before) = 14
+  toa256 (before) = 512 / 256 = 2
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 256 / 256 = 1
+Step #15
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 256 / 256 = 1
+  lchan.rqd_ta (after) = 16
+  toa256 (after) = 0 / 256 = 0
+Step #16
+  lchan.rqd_ta (before) = 16
+  toa256 (before) = 0 / 256 = 0
+  lchan.rqd_ta (after) = 16
+  toa256 (after) = 0 / 256 = 0
+Step #17
+  lchan.rqd_ta (before) = 16
+  toa256 (before) = 0 / 256 = 0
+  lchan.rqd_ta (after) = 16
+  toa256 (after) = 0 / 256 = 0
+Step #18
+  lchan.rqd_ta (before) = 16
+  toa256 (before) = 0 / 256 = 0
+  lchan.rqd_ta (after) = 16
+  toa256 (after) = 0 / 256 = 0
+Step #19
+  lchan.rqd_ta (before) = 16
+  toa256 (before) = 0 / 256 = 0
+  lchan.rqd_ta (after) = 16
+  toa256 (after) = 0 / 256 = 0
+Done.
+
+toa256_start = 4000 / 256 = 15, steps = 50
+Step #0
+  lchan.rqd_ta (before) = 0
+  toa256 (before) = 4000 / 256 = 15
+  lchan.rqd_ta (after) = 1
+  toa256 (after) = 3744 / 256 = 14
+Step #1
+  lchan.rqd_ta (before) = 1
+  toa256 (before) = 3744 / 256 = 14
+  lchan.rqd_ta (after) = 2
+  toa256 (after) = 3488 / 256 = 13
+Step #2
+  lchan.rqd_ta (before) = 2
+  toa256 (before) = 3488 / 256 = 13
+  lchan.rqd_ta (after) = 3
+  toa256 (after) = 3232 / 256 = 12
+Step #3
+  lchan.rqd_ta (before) = 3
+  toa256 (before) = 3232 / 256 = 12
+  lchan.rqd_ta (after) = 4
+  toa256 (after) = 2976 / 256 = 11
+Step #4
+  lchan.rqd_ta (before) = 4
+  toa256 (before) = 2976 / 256 = 11
+  lchan.rqd_ta (after) = 5
+  toa256 (after) = 2720 / 256 = 10
+Step #5
+  lchan.rqd_ta (before) = 5
+  toa256 (before) = 2720 / 256 = 10
+  lchan.rqd_ta (after) = 6
+  toa256 (after) = 2464 / 256 = 9
+Step #6
+  lchan.rqd_ta (before) = 6
+  toa256 (before) = 2464 / 256 = 9
+  lchan.rqd_ta (after) = 7
+  toa256 (after) = 2208 / 256 = 8
+Step #7
+  lchan.rqd_ta (before) = 7
+  toa256 (before) = 2208 / 256 = 8
+  lchan.rqd_ta (after) = 8
+  toa256 (after) = 1952 / 256 = 7
+Step #8
+  lchan.rqd_ta (before) = 8
+  toa256 (before) = 1952 / 256 = 7
+  lchan.rqd_ta (after) = 9
+  toa256 (after) = 1696 / 256 = 6
+Step #9
+  lchan.rqd_ta (before) = 9
+  toa256 (before) = 1696 / 256 = 6
+  lchan.rqd_ta (after) = 10
+  toa256 (after) = 1440 / 256 = 5
+Step #10
+  lchan.rqd_ta (before) = 10
+  toa256 (before) = 1440 / 256 = 5
+  lchan.rqd_ta (after) = 11
+  toa256 (after) = 1184 / 256 = 4
+Step #11
+  lchan.rqd_ta (before) = 11
+  toa256 (before) = 1184 / 256 = 4
+  lchan.rqd_ta (after) = 12
+  toa256 (after) = 928 / 256 = 3
+Step #12
+  lchan.rqd_ta (before) = 12
+  toa256 (before) = 928 / 256 = 3
+  lchan.rqd_ta (after) = 13
+  toa256 (after) = 672 / 256 = 2
+Step #13
+  lchan.rqd_ta (before) = 13
+  toa256 (before) = 672 / 256 = 2
+  lchan.rqd_ta (after) = 14
+  toa256 (after) = 416 / 256 = 1
+Step #14
+  lchan.rqd_ta (before) = 14
+  toa256 (before) = 416 / 256 = 1
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #15
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #16
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #17
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #18
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #19
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #20
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #21
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #22
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #23
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #24
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #25
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #26
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #27
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #28
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #29
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #30
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #31
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #32
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #33
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #34
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #35
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #36
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #37
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #38
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #39
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #40
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #41
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #42
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #43
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #44
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #45
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #46
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #47
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #48
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Step #49
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 160 / 256 = 0
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 160 / 256 = 0
+Done.
+
+toa256_start = 12345 / 256 = 48, steps = 50
+Step #0
+  lchan.rqd_ta (before) = 0
+  toa256 (before) = 12345 / 256 = 48
+  lchan.rqd_ta (after) = 1
+  toa256 (after) = 12089 / 256 = 47
+Step #1
+  lchan.rqd_ta (before) = 1
+  toa256 (before) = 12089 / 256 = 47
+  lchan.rqd_ta (after) = 2
+  toa256 (after) = 11833 / 256 = 46
+Step #2
+  lchan.rqd_ta (before) = 2
+  toa256 (before) = 11833 / 256 = 46
+  lchan.rqd_ta (after) = 3
+  toa256 (after) = 11577 / 256 = 45
+Step #3
+  lchan.rqd_ta (before) = 3
+  toa256 (before) = 11577 / 256 = 45
+  lchan.rqd_ta (after) = 4
+  toa256 (after) = 11321 / 256 = 44
+Step #4
+  lchan.rqd_ta (before) = 4
+  toa256 (before) = 11321 / 256 = 44
+  lchan.rqd_ta (after) = 5
+  toa256 (after) = 11065 / 256 = 43
+Step #5
+  lchan.rqd_ta (before) = 5
+  toa256 (before) = 11065 / 256 = 43
+  lchan.rqd_ta (after) = 6
+  toa256 (after) = 10809 / 256 = 42
+Step #6
+  lchan.rqd_ta (before) = 6
+  toa256 (before) = 10809 / 256 = 42
+  lchan.rqd_ta (after) = 7
+  toa256 (after) = 10553 / 256 = 41
+Step #7
+  lchan.rqd_ta (before) = 7
+  toa256 (before) = 10553 / 256 = 41
+  lchan.rqd_ta (after) = 8
+  toa256 (after) = 10297 / 256 = 40
+Step #8
+  lchan.rqd_ta (before) = 8
+  toa256 (before) = 10297 / 256 = 40
+  lchan.rqd_ta (after) = 9
+  toa256 (after) = 10041 / 256 = 39
+Step #9
+  lchan.rqd_ta (before) = 9
+  toa256 (before) = 10041 / 256 = 39
+  lchan.rqd_ta (after) = 10
+  toa256 (after) = 9785 / 256 = 38
+Step #10
+  lchan.rqd_ta (before) = 10
+  toa256 (before) = 9785 / 256 = 38
+  lchan.rqd_ta (after) = 11
+  toa256 (after) = 9529 / 256 = 37
+Step #11
+  lchan.rqd_ta (before) = 11
+  toa256 (before) = 9529 / 256 = 37
+  lchan.rqd_ta (after) = 12
+  toa256 (after) = 9273 / 256 = 36
+Step #12
+  lchan.rqd_ta (before) = 12
+  toa256 (before) = 9273 / 256 = 36
+  lchan.rqd_ta (after) = 13
+  toa256 (after) = 9017 / 256 = 35
+Step #13
+  lchan.rqd_ta (before) = 13
+  toa256 (before) = 9017 / 256 = 35
+  lchan.rqd_ta (after) = 14
+  toa256 (after) = 8761 / 256 = 34
+Step #14
+  lchan.rqd_ta (before) = 14
+  toa256 (before) = 8761 / 256 = 34
+  lchan.rqd_ta (after) = 15
+  toa256 (after) = 8505 / 256 = 33
+Step #15
+  lchan.rqd_ta (before) = 15
+  toa256 (before) = 8505 / 256 = 33
+  lchan.rqd_ta (after) = 16
+  toa256 (after) = 8249 / 256 = 32
+Step #16
+  lchan.rqd_ta (before) = 16
+  toa256 (before) = 8249 / 256 = 32
+  lchan.rqd_ta (after) = 17
+  toa256 (after) = 7993 / 256 = 31
+Step #17
+  lchan.rqd_ta (before) = 17
+  toa256 (before) = 7993 / 256 = 31
+  lchan.rqd_ta (after) = 18
+  toa256 (after) = 7737 / 256 = 30
+Step #18
+  lchan.rqd_ta (before) = 18
+  toa256 (before) = 7737 / 256 = 30
+  lchan.rqd_ta (after) = 19
+  toa256 (after) = 7481 / 256 = 29
+Step #19
+  lchan.rqd_ta (before) = 19
+  toa256 (before) = 7481 / 256 = 29
+  lchan.rqd_ta (after) = 20
+  toa256 (after) = 7225 / 256 = 28
+Step #20
+  lchan.rqd_ta (before) = 20
+  toa256 (before) = 7225 / 256 = 28
+  lchan.rqd_ta (after) = 21
+  toa256 (after) = 6969 / 256 = 27
+Step #21
+  lchan.rqd_ta (before) = 21
+  toa256 (before) = 6969 / 256 = 27
+  lchan.rqd_ta (after) = 22
+  toa256 (after) = 6713 / 256 = 26
+Step #22
+  lchan.rqd_ta (before) = 22
+  toa256 (before) = 6713 / 256 = 26
+  lchan.rqd_ta (after) = 23
+  toa256 (after) = 6457 / 256 = 25
+Step #23
+  lchan.rqd_ta (before) = 23
+  toa256 (before) = 6457 / 256 = 25
+  lchan.rqd_ta (after) = 24
+  toa256 (after) = 6201 / 256 = 24
+Step #24
+  lchan.rqd_ta (before) = 24
+  toa256 (before) = 6201 / 256 = 24
+  lchan.rqd_ta (after) = 25
+  toa256 (after) = 5945 / 256 = 23
+Step #25
+  lchan.rqd_ta (before) = 25
+  toa256 (before) = 5945 / 256 = 23
+  lchan.rqd_ta (after) = 26
+  toa256 (after) = 5689 / 256 = 22
+Step #26
+  lchan.rqd_ta (before) = 26
+  toa256 (before) = 5689 / 256 = 22
+  lchan.rqd_ta (after) = 27
+  toa256 (after) = 5433 / 256 = 21
+Step #27
+  lchan.rqd_ta (before) = 27
+  toa256 (before) = 5433 / 256 = 21
+  lchan.rqd_ta (after) = 28
+  toa256 (after) = 5177 / 256 = 20
+Step #28
+  lchan.rqd_ta (before) = 28
+  toa256 (before) = 5177 / 256 = 20
+  lchan.rqd_ta (after) = 29
+  toa256 (after) = 4921 / 256 = 19
+Step #29
+  lchan.rqd_ta (before) = 29
+  toa256 (before) = 4921 / 256 = 19
+  lchan.rqd_ta (after) = 30
+  toa256 (after) = 4665 / 256 = 18
+Step #30
+  lchan.rqd_ta (before) = 30
+  toa256 (before) = 4665 / 256 = 18
+  lchan.rqd_ta (after) = 31
+  toa256 (after) = 4409 / 256 = 17
+Step #31
+  lchan.rqd_ta (before) = 31
+  toa256 (before) = 4409 / 256 = 17
+  lchan.rqd_ta (after) = 32
+  toa256 (after) = 4153 / 256 = 16
+Step #32
+  lchan.rqd_ta (before) = 32
+  toa256 (before) = 4153 / 256 = 16
+  lchan.rqd_ta (after) = 33
+  toa256 (after) = 3897 / 256 = 15
+Step #33
+  lchan.rqd_ta (before) = 33
+  toa256 (before) = 3897 / 256 = 15
+  lchan.rqd_ta (after) = 34
+  toa256 (after) = 3641 / 256 = 14
+Step #34
+  lchan.rqd_ta (before) = 34
+  toa256 (before) = 3641 / 256 = 14
+  lchan.rqd_ta (after) = 35
+  toa256 (after) = 3385 / 256 = 13
+Step #35
+  lchan.rqd_ta (before) = 35
+  toa256 (before) = 3385 / 256 = 13
+  lchan.rqd_ta (after) = 36
+  toa256 (after) = 3129 / 256 = 12
+Step #36
+  lchan.rqd_ta (before) = 36
+  toa256 (before) = 3129 / 256 = 12
+  lchan.rqd_ta (after) = 37
+  toa256 (after) = 2873 / 256 = 11
+Step #37
+  lchan.rqd_ta (before) = 37
+  toa256 (before) = 2873 / 256 = 11
+  lchan.rqd_ta (after) = 38
+  toa256 (after) = 2617 / 256 = 10
+Step #38
+  lchan.rqd_ta (before) = 38
+  toa256 (before) = 2617 / 256 = 10
+  lchan.rqd_ta (after) = 39
+  toa256 (after) = 2361 / 256 = 9
+Step #39
+  lchan.rqd_ta (before) = 39
+  toa256 (before) = 2361 / 256 = 9
+  lchan.rqd_ta (after) = 40
+  toa256 (after) = 2105 / 256 = 8
+Step #40
+  lchan.rqd_ta (before) = 40
+  toa256 (before) = 2105 / 256 = 8
+  lchan.rqd_ta (after) = 41
+  toa256 (after) = 1849 / 256 = 7
+Step #41
+  lchan.rqd_ta (before) = 41
+  toa256 (before) = 1849 / 256 = 7
+  lchan.rqd_ta (after) = 42
+  toa256 (after) = 1593 / 256 = 6
+Step #42
+  lchan.rqd_ta (before) = 42
+  toa256 (before) = 1593 / 256 = 6
+  lchan.rqd_ta (after) = 43
+  toa256 (after) = 1337 / 256 = 5
+Step #43
+  lchan.rqd_ta (before) = 43
+  toa256 (before) = 1337 / 256 = 5
+  lchan.rqd_ta (after) = 44
+  toa256 (after) = 1081 / 256 = 4
+Step #44
+  lchan.rqd_ta (before) = 44
+  toa256 (before) = 1081 / 256 = 4
+  lchan.rqd_ta (after) = 45
+  toa256 (after) = 825 / 256 = 3
+Step #45
+  lchan.rqd_ta (before) = 45
+  toa256 (before) = 825 / 256 = 3
+  lchan.rqd_ta (after) = 46
+  toa256 (after) = 569 / 256 = 2
+Step #46
+  lchan.rqd_ta (before) = 46
+  toa256 (before) = 569 / 256 = 2
+  lchan.rqd_ta (after) = 47
+  toa256 (after) = 313 / 256 = 1
+Step #47
+  lchan.rqd_ta (before) = 47
+  toa256 (before) = 313 / 256 = 1
+  lchan.rqd_ta (after) = 48
+  toa256 (after) = 57 / 256 = 0
+Step #48
+  lchan.rqd_ta (before) = 48
+  toa256 (before) = 57 / 256 = 0
+  lchan.rqd_ta (after) = 48
+  toa256 (after) = 57 / 256 = 0
+Step #49
+  lchan.rqd_ta (before) = 48
+  toa256 (before) = 57 / 256 = 0
+  lchan.rqd_ta (after) = 48
+  toa256 (after) = 57 / 256 = 0
+Done.
+
diff --git a/tests/testsuite.at b/tests/testsuite.at
index 2d1cefd3..d9bc1cee 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -49,3 +49,9 @@ AT_KEYWORDS([meas])
 cat $abs_srcdir/meas/meas_test.ok > expout
 AT_CHECK([$abs_top_builddir/tests/meas/meas_test], [], [expout], [ignore])
 AT_CLEANUP
+
+AT_SETUP([ta_control])
+AT_KEYWORDS([ta_control])
+cat $abs_srcdir/ta_control/ta_control_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/ta_control/ta_control_test], [], [expout], [ignore])
+AT_CLEANUP