Shawn McCarney | 6663abf | 2020-02-29 17:25:48 -0600 | [diff] [blame] | 1 | /** |
| 2 | * Copyright © 2020 IBM Corporation |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | #include "pmbus_utils.hpp" |
| 17 | |
| 18 | #include <cstdint> |
| 19 | |
| 20 | #include <gtest/gtest.h> |
| 21 | |
| 22 | using namespace phosphor::power::regulators; |
| 23 | |
| 24 | TEST(PMBusUtilsTests, ParseVoutMode) |
| 25 | { |
| 26 | uint8_t voutModeValue; |
| 27 | pmbus_utils::VoutDataFormat format; |
| 28 | int8_t parameter; |
| 29 | |
| 30 | // Linear format: Exponent is negative: 0b1'1111 |
| 31 | voutModeValue = 0b0001'1111u; |
| 32 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 33 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::linear); |
| 34 | EXPECT_EQ(parameter, -1); |
| 35 | |
| 36 | // Linear format: Exponent is negative: 0b1'0000 |
| 37 | voutModeValue = 0b1001'0000u; |
| 38 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 39 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::linear); |
| 40 | EXPECT_EQ(parameter, -16); |
| 41 | |
| 42 | // Linear format: Exponent is positive: 0b0'1111 |
| 43 | voutModeValue = 0b1000'1111u; |
| 44 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 45 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::linear); |
| 46 | EXPECT_EQ(parameter, 15); |
| 47 | |
| 48 | // Linear format: Exponent is positive: 0b0'0001 |
| 49 | voutModeValue = 0b0000'0001u; |
| 50 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 51 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::linear); |
| 52 | EXPECT_EQ(parameter, 1); |
| 53 | |
| 54 | // Linear format: Exponent is zero: 0b0'0000 |
| 55 | voutModeValue = 0b0000'0000u; |
| 56 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 57 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::linear); |
| 58 | EXPECT_EQ(parameter, 0); |
| 59 | |
| 60 | // VID format: VID code is 0b1'1111 |
| 61 | voutModeValue = 0b0011'1111u; |
| 62 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 63 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::vid); |
| 64 | EXPECT_EQ(parameter, 31); |
| 65 | |
| 66 | // VID format: VID code is 0b1'0000 |
| 67 | voutModeValue = 0b1011'0000u; |
| 68 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 69 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::vid); |
| 70 | EXPECT_EQ(parameter, 16); |
| 71 | |
| 72 | // VID format: VID code is 0b0'1111 |
| 73 | voutModeValue = 0b1010'1111u; |
| 74 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 75 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::vid); |
| 76 | EXPECT_EQ(parameter, 15); |
| 77 | |
| 78 | // VID format: VID code is 0b0'0001 |
| 79 | voutModeValue = 0b0010'0001u; |
| 80 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 81 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::vid); |
| 82 | EXPECT_EQ(parameter, 1); |
| 83 | |
| 84 | // VID format: VID code is 0b0'0000 |
| 85 | voutModeValue = 0b1010'0000u; |
| 86 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 87 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::vid); |
| 88 | EXPECT_EQ(parameter, 0); |
| 89 | |
| 90 | // Direct format |
| 91 | voutModeValue = 0b1100'0000u; |
| 92 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 93 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::direct); |
| 94 | EXPECT_EQ(parameter, 0); |
| 95 | |
| 96 | // IEEE format |
| 97 | voutModeValue = 0b0110'0000u; |
| 98 | pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| 99 | EXPECT_EQ(format, pmbus_utils::VoutDataFormat::ieee); |
| 100 | EXPECT_EQ(parameter, 0); |
| 101 | } |
| 102 | |
Bob King | d6820bb | 2020-04-28 15:37:02 +0800 | [diff] [blame] | 103 | TEST(PMBusUtilsTests, ToString) |
| 104 | { |
| 105 | // Sensor data format: SensorDataFormat::linear_11 |
| 106 | { |
| 107 | pmbus_utils::SensorDataFormat format = |
| 108 | pmbus_utils::SensorDataFormat::linear_11; |
| 109 | EXPECT_EQ(pmbus_utils::toString(format), "linear_11"); |
| 110 | } |
| 111 | |
| 112 | // Sensor data format: SensorDataFormat::linear_16 |
| 113 | { |
| 114 | pmbus_utils::SensorDataFormat format = |
| 115 | pmbus_utils::SensorDataFormat::linear_16; |
| 116 | EXPECT_EQ(pmbus_utils::toString(format), "linear_16"); |
| 117 | } |
| 118 | |
Bob King | d6820bb | 2020-04-28 15:37:02 +0800 | [diff] [blame] | 119 | // Vout data format: VoutDataFormat::linear |
| 120 | { |
| 121 | pmbus_utils::VoutDataFormat format = |
| 122 | pmbus_utils::VoutDataFormat::linear; |
| 123 | EXPECT_EQ(pmbus_utils::toString(format), "linear"); |
| 124 | } |
| 125 | |
| 126 | // Vout data format: VoutDataFormat::vid |
| 127 | { |
| 128 | pmbus_utils::VoutDataFormat format = pmbus_utils::VoutDataFormat::vid; |
| 129 | EXPECT_EQ(pmbus_utils::toString(format), "vid"); |
| 130 | } |
| 131 | |
| 132 | // Vout data format: VoutDataFormat::direct |
| 133 | { |
| 134 | pmbus_utils::VoutDataFormat format = |
| 135 | pmbus_utils::VoutDataFormat::direct; |
| 136 | EXPECT_EQ(pmbus_utils::toString(format), "direct"); |
| 137 | } |
| 138 | |
| 139 | // Vout data format: VoutDataFormat::ieee |
| 140 | { |
| 141 | pmbus_utils::VoutDataFormat format = pmbus_utils::VoutDataFormat::ieee; |
| 142 | EXPECT_EQ(pmbus_utils::toString(format), "ieee"); |
| 143 | } |
| 144 | } |
| 145 | |
Bob King | 19523dd | 2020-05-08 14:50:36 +0800 | [diff] [blame] | 146 | TEST(PMBusUtilsTests, ConvertFromLinear) |
| 147 | { |
| 148 | uint16_t value; |
| 149 | |
| 150 | // Minimum possible exponent value: -16 |
| 151 | // mantissa : 511, exponent : -16, decimal = 511 * 2^-16 = |
| 152 | // 0.0077972412109375 |
| 153 | value = 0x81ff; |
| 154 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 0.0077972412109375); |
| 155 | |
| 156 | // Maximum possible exponent value: 15 |
| 157 | // mantissa : 2, exponent : 15, decimal = 2 * 2^15 = 65536 |
| 158 | value = 0x7802; |
| 159 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 65536); |
| 160 | |
| 161 | // Minimum possible mantissa value: -1024 |
| 162 | // mantissa : -1024, exponent : 1, decimal = -1024 * 2^1 = -2048 |
| 163 | value = 0x0c00; |
| 164 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), -2048); |
| 165 | |
| 166 | // Maximum possible mantissa value: 1023 |
| 167 | // mantissa : 1023, exponent : -11, decimal = 1023 * 2^-11 = 0.49951171875 |
| 168 | value = 0xabff; |
| 169 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 0.49951171875); |
| 170 | |
| 171 | // Exponent = 0, mantissa > 0 |
| 172 | // mantissa : 1, exponent : 0, decimal = 1 * 2^0 = 1 |
| 173 | value = 0x0001; |
| 174 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 1); |
| 175 | |
| 176 | // Exponent > 0, mantissa > 0 |
| 177 | // mantissa : 2, exponent : 1, decimal = 2 * 2^1 = 4 |
| 178 | value = 0x0802; |
| 179 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 4); |
| 180 | |
| 181 | // Exponent < 0, mantissa > 0 |
| 182 | // mantissa : 15, exponent : -1, decimal = 15 * 2^-1 = 7.5 |
| 183 | value = 0xf80f; |
| 184 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 7.5); |
| 185 | |
| 186 | // Exponent > 0, mantissa = 0 |
| 187 | // mantissa : 0, exponent : 3, decimal = 0 * 2^3 = 0 |
| 188 | value = 0x1800; |
| 189 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 0); |
| 190 | |
| 191 | // Exponent > 0, mantissa < 0 |
| 192 | // mantissa : -2, exponent : 3, decimal = -2 * 2^3 = -16 |
| 193 | value = 0x1ffe; |
| 194 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), -16); |
| 195 | } |
| 196 | |
Bob King | 8d0b3ce | 2020-05-12 15:30:08 +0800 | [diff] [blame] | 197 | TEST(PMBusUtilsTests, ConvertFromVoutLinear) |
| 198 | { |
| 199 | uint16_t value; |
| 200 | int8_t exponent; |
| 201 | |
| 202 | // mantissa : 1, exponent : 2, decimal = 1 * 2^2 = 4 |
| 203 | value = 0x0001; |
| 204 | exponent = 2; |
| 205 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromVoutLinear(value, exponent), 4); |
| 206 | |
| 207 | // mantissa : 15, exponent : 0, decimal = 15 * 2^0 = 15 |
| 208 | value = 0x000f; |
| 209 | exponent = 0; |
| 210 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromVoutLinear(value, exponent), 15); |
| 211 | |
| 212 | // mantissa : 255, exponent : -3, decimal = 255 * 2^-3 = 31.875 |
| 213 | value = 0x00ff; |
| 214 | exponent = -3; |
| 215 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromVoutLinear(value, exponent), |
| 216 | 31.875); |
| 217 | |
| 218 | // mantissa : 0, exponent : 10, decimal = 0 * 2^10 = 0 |
| 219 | value = 0x0000; |
| 220 | exponent = 10; |
| 221 | EXPECT_DOUBLE_EQ(pmbus_utils::convertFromVoutLinear(value, exponent), 0); |
| 222 | } |
| 223 | |
Shawn McCarney | 6663abf | 2020-02-29 17:25:48 -0600 | [diff] [blame] | 224 | TEST(PMBusUtilsTests, ConvertToVoutLinear) |
| 225 | { |
| 226 | double volts; |
| 227 | int8_t exponent; |
| 228 | |
| 229 | // Exponent > 0: Value is not rounded up |
| 230 | volts = 13.9; |
| 231 | exponent = 2; |
| 232 | // 13.9 / 2^2 == 3.475 = 3 |
| 233 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 3); |
| 234 | |
| 235 | // Exponent > 0: Value is rounded up |
| 236 | volts = 14.0; |
| 237 | exponent = 2; |
| 238 | // 14.0 / 2^2 == 3.5 = 4 |
| 239 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 4); |
| 240 | |
| 241 | // Exponent = 0: Value is not rounded up |
| 242 | volts = 2.49; |
| 243 | exponent = 0; |
| 244 | // 2.49 / 2^0 == 2.49 = 2 |
| 245 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 2); |
| 246 | |
| 247 | // Exponent = 0: Value is rounded up |
| 248 | volts = 2.51; |
| 249 | exponent = 0; |
| 250 | // 2.51 / 2^0 == 2.51 = 3 |
| 251 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 3); |
| 252 | |
| 253 | // Exponent < 0: Value is not rounded up |
| 254 | volts = 1.32613; |
| 255 | exponent = -8; |
| 256 | // 1.32613 / 2^-8 == 339.48928 == 339 |
| 257 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 339); |
| 258 | |
| 259 | // Exponent < 0: Value is rounded up |
| 260 | volts = 1.32618; |
| 261 | exponent = -8; |
| 262 | // 1.32618 / 2^-8 == 339.50208 == 340 |
| 263 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 340); |
| 264 | } |