GY-63_MS5611/libraries/DS1821/DS1821.cpp

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//
// FILE: DS1821.cpp
// AUTHOR: Rob Tillaart
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// VERSION: 0.3.4
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// DATE: 2014-10-05
// PURPOSE: Arduino library for DS1821 temperature sensor
// URL: https://github.com/RobTillaart/DS1821
//
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// HISTORY: see changelog.md
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#include "DS1821.h"
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// CONFIG REGISTER MASKS... P7-8 datasheet
#define DS1821_CONF_1SHOT 0x01
#define DS1821_CONF_POL 0x02
#define DS1821_CONF_TR 0x04
#define DS1821_CONF_TLF 0x08
#define DS1821_CONF_THF 0x10
#define DS1821_CONF_NVB 0x20
// skip always one 0x40
#define DS1821_CONF_DONE 0x80
// COMMANDS P10-11 datasheet
#define START_CONVERT 0xEE
#define STOP_CONVERT 0x22
#define READ_CONFIG_REG 0xAC
#define WRITE_CONFIG_REG 0x0C
#define READ_TEMPERATURE 0xAA
#define READ_COUNTER 0xA0
#define LOAD_COUNTER 0x41
#define WRITE_TH 0x01
#define WRITE_TL 0x02
#define READ_TH 0xA1
#define READ_TL 0xA2
////////////////////////////////////////////////////////////////
//
// PUBLIC
//
DS1821::DS1821(OneWire *ow)
{
_oneWire = ow;
_error = DS1821_RESET_OK;
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}
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// P5 - Operation measuring temperature
int DS1821::requestTemperature()
{
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(START_CONVERT);
return DS1821_RESET_OK;
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}
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int DS1821::requestContinuous()
{
_clrConfigFlag(DS1821_CONF_1SHOT);
return requestTemperature();
}
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int DS1821::stopContinuous()
{
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(STOP_CONVERT);
return DS1821_RESET_OK;
}
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int DS1821::conversionReady()
{
return _getConfigFlag(DS1821_CONF_DONE);
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}
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// P5 - Operation measuring temperature
float DS1821::readTemperature()
{
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(READ_TEMPERATURE);
int temperature = _readByte();
// Handle negative values: >= 200 ==> subtract 256;
if (temperature >= 200) temperature -= 256;
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(READ_COUNTER);
int countRemain = _readByte() * 256;
countRemain += _readByte();
// Load counter to populate the slope accumulator into counter register
// Q: is this a fixed number? if so it could be hard coded...
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(LOAD_COUNTER);
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(READ_COUNTER);
int countPerC = _readByte() * 256;
countPerC += _readByte();
return temperature + 0.5 - (1.0 * countRemain) / countPerC;
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}
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int DS1821::setLow(int8_t lo)
{
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(WRITE_TL);
_command(lo);
return DS1821_RESET_OK;
}
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int DS1821::getLow()
{
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(READ_TL);
return _readByte();
}
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int DS1821::setHigh(int8_t hi)
{
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(WRITE_TH);
_command(hi);
return DS1821_RESET_OK;
}
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int DS1821::getHigh()
{
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(READ_TL);
return _readByte();
}
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int DS1821::getHighFlag()
{
return _getConfigFlag(DS1821_CONF_THF);
}
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int DS1821::clrHighFlag()
{
return _clrConfigFlag(DS1821_CONF_THF);
}
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int DS1821::getLowFlag()
{
return _getConfigFlag(DS1821_CONF_TLF);
}
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int DS1821::clrLowFlag()
{
return _clrConfigFlag(DS1821_CONF_TLF);
}
//////////////////////////////////////////////////////////
//
// THERMOSTAT CONFIG
//
int DS1821::setOneWireMode(uint8_t VDD, uint8_t DQ)
{
_VDD = VDD;
_DQ = DQ;
// switch off power
pinMode(_VDD, OUTPUT);
digitalWrite(_VDD, LOW);
pinMode(_DQ, OUTPUT);
digitalWrite(_DQ, HIGH);
delay(1);
// toggle 16 times.
for(uint8_t i = 0; i < 16; i++)
{
digitalWrite(_DQ, LOW);
digitalWrite(_DQ, HIGH);
}
pinMode(_DQ, INPUT);
// switch power on again.
digitalWrite(_VDD, HIGH);
delay(1);
return _clrConfigFlag(DS1821_CONF_TR);
}
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int DS1821::setPolarity(int activeState)
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{
if (activeState == HIGH) return _setConfigFlag(DS1821_CONF_POL);
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return _clrConfigFlag(DS1821_CONF_POL);
}
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int DS1821::getPolarity()
{
return _getConfigFlag(DS1821_CONF_POL);
}
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int DS1821::setThermostatMode()
{
int rv = _setConfigFlag(DS1821_CONF_TR);
delay(10); // wait for copy to NVRAM
digitalWrite(_VDD, LOW);
delay(1000);
digitalWrite(_VDD, HIGH);
return rv;
}
////////////////////////////////////////////////////////////////
//
// PRIVATE
//
int DS1821::_getConfigFlag(uint8_t flag)
{
return ((_readConfig() & flag) > 0); // true = 1 / false = 0
}
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// See page 4 datasheet
uint8_t DS1821::_waitForNVB()
{
uint8_t config = 0;
for (uint8_t i = 0; i < 10; i++)
{
config = _readConfig();
if (!(config & DS1821_CONF_NVB)) break;
delay(1);
}
return config;
}
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int DS1821::_setConfigFlag(uint8_t flag)
{
uint8_t config = _waitForNVB();
config |= flag;
return _writeConfig(config);
}
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int DS1821::_clrConfigFlag(uint8_t flag)
{
uint8_t config = _waitForNVB();
config &= ~flag;
return _writeConfig(config);
}
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int DS1821::_readConfig()
{
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(READ_CONFIG_REG);
return _readByte();
}
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int DS1821::_writeConfig(uint8_t val)
{
while (_getConfigFlag(DS1821_CONF_NVB)) delay(1);
if (_reset() != DS1821_RESET_OK) return DS1821_RESET_ERROR;
_command(WRITE_CONFIG_REG);
_command(val);
return DS1821_RESET_OK;
}
// -- END OF FILE --