| /** |
| * Copyright © 2020 IBM Corporation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #include "pmbus_utils.hpp" |
| |
| #include <cstdint> |
| |
| #include <gtest/gtest.h> |
| |
| using namespace phosphor::power::regulators; |
| |
| TEST(PMBusUtilsTests, ParseVoutMode) |
| { |
| uint8_t voutModeValue; |
| pmbus_utils::VoutDataFormat format; |
| int8_t parameter; |
| |
| // Linear format: Exponent is negative: 0b1'1111 |
| voutModeValue = 0b0001'1111u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::linear); |
| EXPECT_EQ(parameter, -1); |
| |
| // Linear format: Exponent is negative: 0b1'0000 |
| voutModeValue = 0b1001'0000u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::linear); |
| EXPECT_EQ(parameter, -16); |
| |
| // Linear format: Exponent is positive: 0b0'1111 |
| voutModeValue = 0b1000'1111u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::linear); |
| EXPECT_EQ(parameter, 15); |
| |
| // Linear format: Exponent is positive: 0b0'0001 |
| voutModeValue = 0b0000'0001u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::linear); |
| EXPECT_EQ(parameter, 1); |
| |
| // Linear format: Exponent is zero: 0b0'0000 |
| voutModeValue = 0b0000'0000u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::linear); |
| EXPECT_EQ(parameter, 0); |
| |
| // VID format: VID code is 0b1'1111 |
| voutModeValue = 0b0011'1111u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::vid); |
| EXPECT_EQ(parameter, 31); |
| |
| // VID format: VID code is 0b1'0000 |
| voutModeValue = 0b1011'0000u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::vid); |
| EXPECT_EQ(parameter, 16); |
| |
| // VID format: VID code is 0b0'1111 |
| voutModeValue = 0b1010'1111u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::vid); |
| EXPECT_EQ(parameter, 15); |
| |
| // VID format: VID code is 0b0'0001 |
| voutModeValue = 0b0010'0001u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::vid); |
| EXPECT_EQ(parameter, 1); |
| |
| // VID format: VID code is 0b0'0000 |
| voutModeValue = 0b1010'0000u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::vid); |
| EXPECT_EQ(parameter, 0); |
| |
| // Direct format |
| voutModeValue = 0b1100'0000u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::direct); |
| EXPECT_EQ(parameter, 0); |
| |
| // IEEE format |
| voutModeValue = 0b0110'0000u; |
| pmbus_utils::parseVoutMode(voutModeValue, format, parameter); |
| EXPECT_EQ(format, pmbus_utils::VoutDataFormat::ieee); |
| EXPECT_EQ(parameter, 0); |
| } |
| |
| TEST(PMBusUtilsTests, ToString) |
| { |
| // Sensor data format: SensorDataFormat::linear_11 |
| { |
| pmbus_utils::SensorDataFormat format = |
| pmbus_utils::SensorDataFormat::linear_11; |
| EXPECT_EQ(pmbus_utils::toString(format), "linear_11"); |
| } |
| |
| // Sensor data format: SensorDataFormat::linear_16 |
| { |
| pmbus_utils::SensorDataFormat format = |
| pmbus_utils::SensorDataFormat::linear_16; |
| EXPECT_EQ(pmbus_utils::toString(format), "linear_16"); |
| } |
| |
| // Vout data format: VoutDataFormat::linear |
| { |
| pmbus_utils::VoutDataFormat format = |
| pmbus_utils::VoutDataFormat::linear; |
| EXPECT_EQ(pmbus_utils::toString(format), "linear"); |
| } |
| |
| // Vout data format: VoutDataFormat::vid |
| { |
| pmbus_utils::VoutDataFormat format = pmbus_utils::VoutDataFormat::vid; |
| EXPECT_EQ(pmbus_utils::toString(format), "vid"); |
| } |
| |
| // Vout data format: VoutDataFormat::direct |
| { |
| pmbus_utils::VoutDataFormat format = |
| pmbus_utils::VoutDataFormat::direct; |
| EXPECT_EQ(pmbus_utils::toString(format), "direct"); |
| } |
| |
| // Vout data format: VoutDataFormat::ieee |
| { |
| pmbus_utils::VoutDataFormat format = pmbus_utils::VoutDataFormat::ieee; |
| EXPECT_EQ(pmbus_utils::toString(format), "ieee"); |
| } |
| } |
| |
| TEST(PMBusUtilsTests, ConvertFromLinear) |
| { |
| uint16_t value; |
| |
| // Minimum possible exponent value: -16 |
| // mantissa : 511, exponent : -16, decimal = 511 * 2^-16 = |
| // 0.0077972412109375 |
| value = 0x81ff; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 0.0077972412109375); |
| |
| // Maximum possible exponent value: 15 |
| // mantissa : 2, exponent : 15, decimal = 2 * 2^15 = 65536 |
| value = 0x7802; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 65536); |
| |
| // Minimum possible mantissa value: -1024 |
| // mantissa : -1024, exponent : 1, decimal = -1024 * 2^1 = -2048 |
| value = 0x0c00; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), -2048); |
| |
| // Maximum possible mantissa value: 1023 |
| // mantissa : 1023, exponent : -11, decimal = 1023 * 2^-11 = 0.49951171875 |
| value = 0xabff; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 0.49951171875); |
| |
| // Exponent = 0, mantissa > 0 |
| // mantissa : 1, exponent : 0, decimal = 1 * 2^0 = 1 |
| value = 0x0001; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 1); |
| |
| // Exponent > 0, mantissa > 0 |
| // mantissa : 2, exponent : 1, decimal = 2 * 2^1 = 4 |
| value = 0x0802; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 4); |
| |
| // Exponent < 0, mantissa > 0 |
| // mantissa : 15, exponent : -1, decimal = 15 * 2^-1 = 7.5 |
| value = 0xf80f; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 7.5); |
| |
| // Exponent > 0, mantissa = 0 |
| // mantissa : 0, exponent : 3, decimal = 0 * 2^3 = 0 |
| value = 0x1800; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), 0); |
| |
| // Exponent > 0, mantissa < 0 |
| // mantissa : -2, exponent : 3, decimal = -2 * 2^3 = -16 |
| value = 0x1ffe; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromLinear(value), -16); |
| } |
| |
| TEST(PMBusUtilsTests, ConvertFromVoutLinear) |
| { |
| uint16_t value; |
| int8_t exponent; |
| |
| // mantissa : 1, exponent : 2, decimal = 1 * 2^2 = 4 |
| value = 0x0001; |
| exponent = 2; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromVoutLinear(value, exponent), 4); |
| |
| // mantissa : 15, exponent : 0, decimal = 15 * 2^0 = 15 |
| value = 0x000f; |
| exponent = 0; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromVoutLinear(value, exponent), 15); |
| |
| // mantissa : 255, exponent : -3, decimal = 255 * 2^-3 = 31.875 |
| value = 0x00ff; |
| exponent = -3; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromVoutLinear(value, exponent), |
| 31.875); |
| |
| // mantissa : 0, exponent : 10, decimal = 0 * 2^10 = 0 |
| value = 0x0000; |
| exponent = 10; |
| EXPECT_DOUBLE_EQ(pmbus_utils::convertFromVoutLinear(value, exponent), 0); |
| } |
| |
| TEST(PMBusUtilsTests, ConvertToVoutLinear) |
| { |
| double volts; |
| int8_t exponent; |
| |
| // Exponent > 0: Value is not rounded up |
| volts = 13.9; |
| exponent = 2; |
| // 13.9 / 2^2 == 3.475 = 3 |
| EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 3); |
| |
| // Exponent > 0: Value is rounded up |
| volts = 14.0; |
| exponent = 2; |
| // 14.0 / 2^2 == 3.5 = 4 |
| EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 4); |
| |
| // Exponent = 0: Value is not rounded up |
| volts = 2.49; |
| exponent = 0; |
| // 2.49 / 2^0 == 2.49 = 2 |
| EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 2); |
| |
| // Exponent = 0: Value is rounded up |
| volts = 2.51; |
| exponent = 0; |
| // 2.51 / 2^0 == 2.51 = 3 |
| EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 3); |
| |
| // Exponent < 0: Value is not rounded up |
| volts = 1.32613; |
| exponent = -8; |
| // 1.32613 / 2^-8 == 339.48928 == 339 |
| EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 339); |
| |
| // Exponent < 0: Value is rounded up |
| volts = 1.32618; |
| exponent = -8; |
| // 1.32618 / 2^-8 == 339.50208 == 340 |
| EXPECT_EQ(pmbus_utils::convertToVoutLinear(volts, exponent), 340); |
| } |