GY-63_MS5611/libraries/MAX31850/MAX31850.cpp
2024-01-05 09:52:07 +01:00

196 lines
3.7 KiB
C++

//
// FILE: MAX31850.cpp
// AUTHOR: Rob Tillaart
// VERSION: 0.1.4
// DATE: 2021-06-03
// PURPOSE: Arduino library for the MAX31850 thermocouple temperature sensor.
// URL: https://github.com/RobTillaart/MAX31850
#include "MAX31850.h"
// OneWire commands
#define STARTCONVO 0x44
#define READSCRATCH 0xBE
#define WRITESCRATCH 0x4E
// SCRATCHPAD registers
// bit 1 = reserved bit 0 = error flag
#define TC_TEMP_LSB 0
#define TC_TEMP_MSB 1
// bit 3 = reserved bit 0-2 = error codes
#define INTERN_TEMP_LSB 2
#define INTERN_TEMP_MSB 3
// 4 address bits 0..15
#define CONFIGURATION 4
#define RESERVED_1 5
#define RESERVED_2 6
#define RESERVED_3 7
#define SCRATCHPAD_CRC 8
/////////////////////////////////////////////////////////////////////////////
//
// MAX31850
//
MAX31850::MAX31850(OneWire* oneWire)
{
_oneWire = oneWire;
_addresFound = false;
_typeTC = 'K'; // most used.
_TCTemp = 0;
_internalTemp = 0;
_errorBits = 0;
_failFlag = false;
_addrBits = 0;
}
bool MAX31850::begin(uint8_t retries)
{
_addresFound = false;
for (uint8_t r = retries; (r > 0) && (_addresFound == false); r--)
{
_oneWire->reset();
_oneWire->reset_search();
_deviceAddress[0] = 0x00;
_oneWire->search(_deviceAddress);
_addresFound = _deviceAddress[0] != 0x00 &&
_oneWire->crc8(_deviceAddress, 7) == _deviceAddress[7];
}
return _addresFound;
}
bool MAX31850::getAddress(uint8_t* buffer)
{
if (_addresFound)
{
for (uint8_t i = 0; i < 8; i++)
{
buffer[i] = _deviceAddress[i];
}
}
return _addresFound;
}
void MAX31850::requestTemperatures(void)
{
_oneWire->reset();
_oneWire->skip();
_oneWire->write(STARTCONVO, 0);
}
bool MAX31850::isConversionComplete(void)
{
return (_oneWire->read_bit() == 1);
}
float MAX31850::read(void)
{
ScratchPad scratchPad;
for (int i = 0; i < 9; i++) scratchPad[i] = 0;
// NO CRC CHECK
readScratchPad(scratchPad, 5);
_failFlag = scratchPad[TC_TEMP_LSB] & 0x01;
int16_t rawTemperature = (((int16_t)scratchPad[TC_TEMP_MSB]) << 6) | scratchPad[TC_TEMP_LSB] >> 2;
_TCTemp = 0.25 * rawTemperature;
_errorBits = scratchPad[INTERN_TEMP_LSB] & 0x07;
rawTemperature = (((int16_t)scratchPad[INTERN_TEMP_LSB]) << 4) | scratchPad[INTERN_TEMP_LSB] >> 4;
_internalTemp = 0.0625 * rawTemperature;
_addrBits = scratchPad[CONFIGURATION] & 0x0F;
return _TCTemp;
}
float MAX31850::getTempTC(void)
{
return _TCTemp;
}
float MAX31850::getTempInternal(void)
{
return _internalTemp;
}
uint8_t MAX31850::getErrorCode()
{
return _errorBits;
}
uint8_t MAX31850::getAddressPins()
{
return _addrBits;
};
bool MAX31850::setTypeTC(char typeTC)
{
switch(toupper(typeTC))
{
case 'E':
case 'J':
case 'K':
case 'N':
case 'R':
case 'S':
case 'T':
_typeTC = toupper(typeTC);
return true;
}
return false;
}
char MAX31850::getTypeTC()
{
return _typeTC;
}
/////////////////////////////////////////////////////////////////////////////
//
// PROTECTED
//
void MAX31850::readScratchPad(uint8_t *scratchPad, uint8_t fields)
{
_oneWire->reset();
_oneWire->select(_deviceAddress);
_oneWire->write(READSCRATCH);
for (uint8_t i = 0; i < fields; i++)
{
scratchPad[i] = _oneWire->read();
}
_oneWire->reset();
}
/////////////////////////////////////////////////////////////////////////////
//
// MAX31851
//
MAX31851::MAX31851(OneWire * onewire) : MAX31850(onewire)
{
}
// -- END OF FILE --