RoboidControl-cpp/float16.h

#pragma once
//
//    FILE: float16.h
//  AUTHOR: Rob Tillaart
// VERSION: 0.1.8
// PURPOSE: Arduino library to implement float16 data type.
//          half-precision floating point format,
//          used for efficient storage and transport.
//     URL: https://github.com/RobTillaart/float16

#include <stdint.h>

#define FLOAT16_LIB_VERSION (F("0.1.8"))

// typedef uint16_t _fp16;

class float16 {
public:
  //  Constructors
  float16(void) { _value = 0x0000; };
  float16(float f);
  float16(const float16 &f) { _value = f._value; };

  //  Conversion
  float toFloat(void) const;
  //  access the 2 byte representation.
  uint16_t getBinary() { return _value; };
  void setBinary(uint16_t u) { _value = u; };

  //  Printable
  // size_t printTo(Print &p) const;
  void setDecimals(uint8_t d) { _decimals = d; };
  uint8_t getDecimals() { return _decimals; };

  //  equalities
  bool operator==(const float16 &f);
  bool operator!=(const float16 &f);

  bool operator>(const float16 &f);
  bool operator>=(const float16 &f);
  bool operator<(const float16 &f);
  bool operator<=(const float16 &f);

  //  negation
  float16 operator-();

  //  basic math
  float16 operator+(const float16 &f);
  float16 operator-(const float16 &f);
  float16 operator*(const float16 &f);
  float16 operator/(const float16 &f);

  float16 &operator+=(const float16 &f);
  float16 &operator-=(const float16 &f);
  float16 &operator*=(const float16 &f);
  float16 &operator/=(const float16 &f);

  //  math helper functions
  int sign(); //  1 = positive   0 = zero   -1 = negative.
  bool isZero();
  bool isNaN();
  bool isInf();

  //  CORE CONVERSION
  //  should be private but for testing...
  float f16tof32(uint16_t) const;
  uint16_t f32tof16(float) const;

private:
  uint8_t _decimals = 4;
  uint16_t _value;
};

//  -- END OF FILE --