RealHexParser.cpp

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/*
 * RealHexParser.cpp
 *
 * Copyright (c) 2024 Apra Labs
 *
 * This file is part of ApraUtils.
 *
 * Licensed under the MIT License.
 * See LICENSE file in the project root for full license information.
 */
 
#include "utils/RealHexParser.h"
using namespace apra;
 
RealHexParser::RealHexParser(uint8_t realPrecisionDigits) :
        m_readDigits(realPrecisionDigits), m_bitsMask(0) {
    if (realPrecisionDigits > 17) {
        throw "Invalid value. Supported realDigits is upto 17. Ex 15.17";
    }
    for (uint32_t i = 0; i < realPrecisionDigits; i++) {
        m_bitsMask = (m_bitsMask << 1) | 0x1;
    }
}
 
RealHexParser::~RealHexParser() {
}
 
uint32_t RealHexParser::toHex(double realNumber) {
    uint32_t decimalVal = realNumber;
    uint32_t integerVal = realNumber;
    realNumber = realNumber - integerVal;
    for (int16_t i = 0; i < m_readDigits; i++) {
        realNumber *= 2;
        integerVal = realNumber;
        if (integerVal == 1) {
            realNumber = realNumber - integerVal;
            decimalVal = (decimalVal << 1) + 1;
        } else {
            decimalVal = decimalVal << 1;
        }
    }
    return decimalVal;
}
 
double RealHexParser::toReal(uint32_t hexNumber) {
    double decimalVal = 0;
    uint16_t fractionValue = 0;
    decimalVal = hexNumber >> m_readDigits;
    fractionValue = hexNumber & m_bitsMask;
    double temp = 0.00;
    double twos = 2.00;
    for (int i = (m_readDigits-1); i >= 0; i--) {
        temp += (fractionValue >> i & 0x1) / twos;
        twos = twos * 2;
    }
    return (decimalVal + temp);
}