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 | |
| 103 | TEST(PMBusUtilsTests, ConvertToVoutLinear) |
| 104 | { |
| 105 | double volts; |
| 106 | int8_t exponent; |
| 107 | |
| 108 | // Exponent > 0: Value is not rounded up |
| 109 | volts = 13.9; |
| 110 | exponent = 2; |
| 111 | // 13.9 / 2^2 == 3.475 = 3 |
| 112 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 3); |
| 113 | |
| 114 | // Exponent > 0: Value is rounded up |
| 115 | volts = 14.0; |
| 116 | exponent = 2; |
| 117 | // 14.0 / 2^2 == 3.5 = 4 |
| 118 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 4); |
| 119 | |
| 120 | // Exponent = 0: Value is not rounded up |
| 121 | volts = 2.49; |
| 122 | exponent = 0; |
| 123 | // 2.49 / 2^0 == 2.49 = 2 |
| 124 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 2); |
| 125 | |
| 126 | // Exponent = 0: Value is rounded up |
| 127 | volts = 2.51; |
| 128 | exponent = 0; |
| 129 | // 2.51 / 2^0 == 2.51 = 3 |
| 130 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 3); |
| 131 | |
| 132 | // Exponent < 0: Value is not rounded up |
| 133 | volts = 1.32613; |
| 134 | exponent = -8; |
| 135 | // 1.32613 / 2^-8 == 339.48928 == 339 |
| 136 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 339); |
| 137 | |
| 138 | // Exponent < 0: Value is rounded up |
| 139 | volts = 1.32618; |
| 140 | exponent = -8; |
| 141 | // 1.32618 / 2^-8 == 339.50208 == 340 |
| 142 | EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 340); |
| 143 | } |