3  * SPDX-License-Identifier: Apache-2.0
20 	zassert_equal(y_axis[0], linear_interpolate(x_axis, y_axis, len, -1));  in ZTEST()
22 	zassert_equal(y_axis[0], linear_interpolate(x_axis, y_axis, len, x_axis[0] - 1));  in ZTEST()
38 	for (int i = 0; i < ARRAY_SIZE(x_axis); i++) {  in ZTEST()  local
39 		zassert_equal(y_axis[i], linear_interpolate(x_axis, y_axis, len, x_axis[i]));  in ZTEST()
51 	/* 0 to 4 -> 0 */  in ZTEST()
52 	for (int i = 0; i < 5; i++) {  in ZTEST()  local
53 		zassert_equal(0, linear_interpolate(x_axis, y_axis, len, i));  in ZTEST()
55 	/* 5 to 14 -> 1 */  in ZTEST()
56 	for (int i = 5; i < 15; i++) {  in ZTEST()  local
57 		zassert_equal(1, linear_interpolate(x_axis, y_axis, len, i));  in ZTEST()
59 	/* 15 to N -> 2 */  in ZTEST()
60 	for (int i = 15; i <= 20; i++) {  in ZTEST()  local
61 		zassert_equal(2, linear_interpolate(x_axis, y_axis, len, i));  in ZTEST()
74 	/* y = (x - 2000) / 10 */  in ZTEST()
75 	for (int i = x_axis[0]; i <= x_axis[1]; i++) {  in ZTEST()  local
76 		expected = round((i - 2000.0) / 10.0);  in ZTEST()
77 		zassert_equal(expected, linear_interpolate(x_axis, y_axis, len, i));  in ZTEST()
83 	int32_t y_axis[] = {-100, -90, -80, -70, -60, -50, -40, -30, -20, -10, 0};  in ZTEST()
90 	/* y = ((x - 2000) / 10) - 100 */  in ZTEST()
91 	for (int i = x_axis[0]; i <= x_axis[len - 1]; i++) {  in ZTEST()  local
92 		expected = round((i - 2000.0) / 10.0 - 100.0);  in ZTEST()
93 		zassert_equal(expected, linear_interpolate(x_axis, y_axis, len, i));  in ZTEST()
100 	int32_t x_axis[] = {-3000, -2900, -2800, -2700, -2600, -2500,  in ZTEST()
101 			    -2400, -2300, -2200, -2100, -2000};  in ZTEST()
108 	for (int i = x_axis[0]; i <= x_axis[len - 1]; i++) {  in ZTEST()  local
109 		expected = round((i + 3000.0) / 10.0);  in ZTEST()
110 		zassert_equal(expected, linear_interpolate(x_axis, y_axis, len, i));  in ZTEST()
116 	int32_t y_axis[] = {-100, -90, -80, -70, -60, -50, -40, -30, -20, -10, 0};  in ZTEST()
117 	int32_t x_axis[] = {-3000, -2900, -2800, -2700, -2600, -2500,  in ZTEST()
118 			    -2400, -2300, -2200, -2100, -2000};  in ZTEST()
124 	/* y = ((x + 3000) / 10) - 100 */  in ZTEST()
125 	for (int i = x_axis[0]; i <= x_axis[len - 1]; i++) {  in ZTEST()  local
126 		expected = round((i + 3000.0) / 10.0 - 100.0);  in ZTEST()
127 		zassert_equal(expected, linear_interpolate(x_axis, y_axis, len, i));  in ZTEST()
140 	/* First line segment, y = 0.4x - 30 */  in ZTEST()
141 	for (int i = x_axis[0]; i <= x_axis[1]; i++) {  in ZTEST()  local
142 		expected = round(0.4 * i - 30.0);  in ZTEST()
143 		zassert_equal(expected, linear_interpolate(x_axis, y_axis, len, i));  in ZTEST()
146 	/* Second line segment, y = 1.6x - 210 */  in ZTEST()
147 	for (int i = x_axis[1]; i <= x_axis[2]; i++) {  in ZTEST()  local
148 		expected = round(1.6 * i - 210.0);  in ZTEST()
149 		zassert_equal(expected, linear_interpolate(x_axis, y_axis, len, i));  in ZTEST()
152 	/* Third line segment, y = 390 - 1.4x */  in ZTEST()
153 	for (int i = x_axis[2]; i <= x_axis[3]; i++) {  in ZTEST()  local
154 		expected = round(390.0 - 1.4 * i);  in ZTEST()
155 		zassert_equal(expected, linear_interpolate(x_axis, y_axis, len, i));  in ZTEST()
158 	/* Fourth line segment, y = 240 - 0.8x */  in ZTEST()
159 	for (int i = x_axis[3]; i <= x_axis[4]; i++) {  in ZTEST()  local
160 		expected = round(240.0 - 0.8 * i);  in ZTEST()
161 		zassert_equal(expected, linear_interpolate(x_axis, y_axis, len, i));  in ZTEST()