GY-63_MS5611/libraries/Fletcher/Fletcher64.cpp
2023-01-17 19:28:45 +01:00

77 lines
1.4 KiB
C++

//
// FILE: Fletcher64.cpp
// AUTHOR: Rob Tillaart
// PURPOSE: Arduino class for Fletcher32
// URL: https://github.com/RobTillaart/Fletcher
#include "Fletcher64.h"
// UINT32_MAX = 4294967295ULL = ((((uint64_t) 1) << 32) - 1)
#define FLETCHER_64 UINT32_MAX
Fletcher64::Fletcher64()
{
begin();
}
void Fletcher64::begin(uint32_t s1, uint32_t s2)
{
_s1 = (s1 == FLETCHER_64) ? 0 : s1;
_s2 = (s2 == FLETCHER_64) ? 0 : s2;
_count = 0;
}
void Fletcher64::add(uint32_t value)
{
_count++;
#if defined(ARDUINO_ARCH_AVR) || defined(ESP32) || defined(ESP8266)
uint32_t t = 0xFFFFFFFF - value;
if (t >= _s1) _s1 += value;
else _s1 = _s1 + value + 1;
t = 0xFFFFFFFF - _s1;
if (t >= _s2) _s2 += _s1;
else _s2 = _s2 + _s1 + 1;
#elif defined(ARDUINO_ARCH_SAMD)
_s1 += value;
_s1 = (_s1 & FLETCHER_64) + (_s1 >> 32);
_s2 += _s1;
_s2 = (_s2 & FLETCHER_64) + (_s2 >> 32);
#else
_s1 += value;
if (_s1 >= FLETCHER_64) _s1 -= FLETCHER_64;
_s2 += _s1;
if (_s2 >= FLETCHER_64) _s2 -= FLETCHER_64;
#endif
}
void Fletcher64::add(const uint32_t * array, uint16_t length)
{
while (length--)
{
add(*array++);
}
}
uint64_t Fletcher64::getFletcher()
{
if (_s1 >= FLETCHER_64) _s1 -= FLETCHER_64;
if (_s2 >= FLETCHER_64) _s2 -= FLETCHER_64;
return (((uint64_t)_s2) << 32) | _s1;
};
uint32_t Fletcher64::count()
{
return _count;
};
// -- END OF FILE --