1 files changed, 77 insertions, 0 deletions
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);
+}