test: body_detection: add unittest for algorithm

Add test to check if the algorithm of body detection is correct.

There are three testcases:
OnBody: always in on-body state, should not change to off-body
Off to On: change state from off-body to on-body
On to Off: change state from on-body to off-body

BRANCH=None
BUG=b:123434029
TEST=make buildall

Signed-off-by: Ching-Kang Yen <chingkang@chromium.org>
Change-Id: Ib027fa3ed659f0d2efd7416888a9ee4ad519edd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2329113
Reviewed-by: Heng-ruey Hsu <henryhsu@chromium.org>

1 files changed, 117 insertions, 0 deletions

diff --git a/test/body_detection.c b/test/body_detection.c
new file mode 100644
index 0000000000..48fefce249
--- /dev/null
+++ b/test/body_detection.c
@@ -0,0 +1,117 @@
+/* Copyright 2020 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Test body_detection algorithm
+ */
+
+#include "accelgyro.h"
+#include "body_detection.h"
+#include "body_detection_test_data.h"
+#include "common.h"
+#include "motion_common.h"
+#include "motion_sense.h"
+#include "test_util.h"
+#include "util.h"
+
+static struct motion_sensor_t *sensor = &motion_sensors[BASE];
+static const int window_size = 50; /* sensor data rate (Hz) */
+
+static int filler(const struct motion_sensor_t *s, const float v)
+{
+	int resolution = s->drv->get_resolution(s);
+	int range = s->drv->get_range(s);
+	int data_1g = BIT(resolution - 1) / range;
+
+	return (int)(v * data_1g / 9.8);
+}
+
+static void feed_body_detect_data(const struct body_detect_test_data *array,
+				  const int idx)
+{
+	sensor->xyz[X] = filler(sensor, array[idx].x);
+	sensor->xyz[Y] = filler(sensor, array[idx].y);
+	sensor->xyz[Z] = filler(sensor, array[idx].z);
+}
+
+static int get_trigger_time(const struct body_detect_test_data *data,
+			    const size_t size,
+			    const enum body_detect_states target_state)
+{
+	int i, action_index = -1, target_index = -1;
+
+	body_detect_reset();
+	/*
+	 * Clear on-body state when the window is initialized, so
+	 * that we do not need to wait for 15 second if the testcase
+	 * is in off-body initially.
+	 */
+	body_detect_change_state(BODY_DETECTION_OFF_BODY);
+	for (i = 0; i < size; ++i) {
+		enum body_detect_states motion_state;
+
+		if (data[i].action == 1 && action_index == -1) {
+			cprints(CC_ACCEL, "action start");
+			action_index = i;
+		}
+		feed_body_detect_data(data, i);
+		/* run the body detect */
+		body_detect();
+		/* skip if action not start yet */
+		if (action_index == -1)
+			continue;
+
+		motion_state = body_detect_get_state();
+		if (target_index == -1 && motion_state == target_state)
+			target_index = i;
+	}
+	if (target_index == -1)
+		return -1;
+	return target_index - action_index;
+}
+
+static int test_body_detect(void)
+{
+	int ret, trigger_time;
+
+	ret = sensor->drv->set_data_rate(sensor, window_size * 1000, 0);
+	TEST_ASSERT(ret == EC_SUCCESS);
+
+	body_detect_set_enable(true);
+	/* Onbody test */
+	cprints(CC_ACCEL, "start OnBody test");
+	trigger_time = get_trigger_time(kBodyDetectOnBodyTestData,
+					kBodyDetectOnBodyTestDataLength,
+					BODY_DETECTION_OFF_BODY);
+	/* It should not enter off-body state ever */
+	TEST_ASSERT(trigger_time == -1);
+
+	/* OffOn test */
+	cprints(CC_ACCEL, "start Off to On test");
+	trigger_time = get_trigger_time(kBodyDetectOffOnTestData,
+					kBodyDetectOffOnTestDataLength,
+					BODY_DETECTION_ON_BODY);
+	/* It should enter on-body state in 3 seconds */
+	TEST_ASSERT(trigger_time >= 0 && trigger_time < 3 * window_size);
+
+	/* OnOff test */
+	cprints(CC_ACCEL, "start On to Off test");
+	trigger_time = get_trigger_time(kBodyDetectOnOffTestData,
+					kBodyDetectOnOffTestDataLength,
+					BODY_DETECTION_OFF_BODY);
+	/* It should enter off-body state between 15 to 20 seconds */
+	TEST_ASSERT(15 * window_size <= trigger_time &&
+		    trigger_time < 20 * window_size);
+
+	return EC_SUCCESS;
+}
+
+
+void run_test(int argc, char **argv)
+{
+	test_reset();
+
+	RUN_TEST(test_body_detect);
+
+	test_print_result();
+}