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/*
/*
This file is part of the Arduino_MKRTHERM library.
This file is part of the Arduino_MKRTHERM library.
Copyright (c) 2019 Arduino SA. All rights reserved.
Copyright (c) 2019 Arduino SA. All rights reserved.
This library is free software; you can redistribute it and/or
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
*/
#include "MKRTHERM.h"
#include "MKRTHERM.h"
THERMClass::THERMClass(int cs, SPIClass& spi) :
THERMClass::THERMClass(int cs, SPIClass& spi) :
_cs(cs),
_cs(cs),
_spi(&spi),
_spi(&spi),
_spiSettings(4000000, MSBFIRST, SPI_MODE0)
_spiSettings(4000000, MSBFIRST, SPI_MODE0)
{
{
}
}
int THERMClass::begin()
int THERMClass::begin()
{
{
uint32_t rawword;
int32_t rawword; // Change uint32_t to int32_t
pinMode(_cs, OUTPUT);
pinMode(_cs, OUTPUT);
digitalWrite(_cs, HIGH);
digitalWrite(_cs, HIGH);
_spi->begin();
_spi->begin();
rawword = readSensor();
rawword = readSensor();
if (rawword == 0xFFFFFF) {
if (rawword == 0xFFFFFF) {
end();
end();
return 0;
return 0;
}
}
return 1;
return 1;
}
}
void THERMClass::end()
void THERMClass::end()
{
{
pinMode(_cs, INPUT);
pinMode(_cs, INPUT);
digitalWrite(_cs, LOW);
digitalWrite(_cs, LOW);
_spi->end();
_spi->end();
}
}
uint32_t THERMClass::readSensor()
uint32_t THERMClass::readSensor()
{
{
uint32_t read = 0x00;
uint32_t read = 0x00;
digitalWrite(_cs, LOW);
digitalWrite(_cs, LOW);
delayMicroseconds(1);
delayMicroseconds(1);
_spi->beginTransaction(_spiSettings);
_spi->beginTransaction(_spiSettings);
for (int i = 0; i < 4; i++) {
for (int i = 0; i < 4; i++) {
read <<= 8;
read <<= 8;
read |= _spi->transfer(0);
read |= _spi->transfer(0);
}
}
_spi->endTransaction();
_spi->endTransaction();
digitalWrite(_cs, HIGH);
digitalWrite(_cs, HIGH);
return read;
return read;
}
}
float THERMClass::readTemperature()
float THERMClass::readTemperature()
{
{
uint32_t rawword;
int32_t rawword; // Change uint32_t to int32_t
float celsius;
float celsius;
rawword = readSensor();
rawword = readSensor();
// Check for reading error
// Check for reading error
if (rawword & 0x7) {
if (rawword & 0x7) {
return NAN;
return NAN;
}
}
// The temperature is stored in the last 14 word's bits
// sendend by the Thermocouple-to-Digital Converter
// The temperature is stored in the last 14 bits
if (rawword & 0x80000000) {
// sent by the Thermocouple-to-Digital Converter
// Negative value, drop the lower 18 bits and explicitly extend sign bits.
rawword >>= 18; // Drop the lower 18 bits
rawword = 0xFFFFC000 | ((rawword >> 18) & 0x00003FFFF);
} else {
// No need for manual sign extension, int32_t handles it
// Positive value, just drop the lower 18 bits.
rawword >>= 18;
}
// multiply for the LSB value
celsius = rawword * 0.25f;
celsius = rawword * 0.25f;
return celsius;
return celsius;
}
}
float THERMClass::readReferenceTemperature()
float THERMClass::readReferenceTemperature()
{
{
uint32_t rawword;
uint32_t rawword;
float ref;
float ref;
rawword = readSensor();
rawword = readSensor();
// ignore first 4 FAULT bits
// Ignore the first 4 FAULT bits
rawword >>= 4;
rawword >>= 4;
// The cold junction reference temperature is stored in the first 11 word's bits
// The cold junction reference temperature is stored in the first 11 bits
// sendend by the Thermocouple-to-Digital Converter
// sent by the Thermocouple-to-Digital Converter
rawword = rawword & 0x7FF;
rawword = rawword & 0x7FF;
// check sign bit and convert to negative value.
// Check the sign bit and convert to negative value if needed.
if (rawword & 0x800) {
if (rawword & 0x800) {
ref = (0xF800 | (rawword & 0x7FF))*0.0625;
ref = (0xF800 | (rawword & 0x7FF)) * 0.0625;
} else {
} else {
// multiply for the LSB value
// Multiply by the LSB value
ref = rawword * 0.0625f;
ref = rawword * 0.0625f;
}
}
return ref;
return ref;
}
}
THERMClass THERM;
THERMClass THERM;