mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-09-19 16:46:11 -04:00
600 lines
12 KiB
C++
600 lines
12 KiB
C++
//
|
|
// FILE: LTC2991.cpp
|
|
// AUTHOR: Rob Tillaart
|
|
// VERSION: 0.2.1
|
|
// DATE: 2021-05-10
|
|
// PURPOSE: Library for LTC2991 temperature and voltage control IC
|
|
// URL: https://github.com/RobTillaart/LTC2991
|
|
|
|
|
|
#include "LTC2991.h"
|
|
|
|
|
|
/////////////////////////////////////////////////////
|
|
//
|
|
// REGISTERS
|
|
//
|
|
#define STATUS_LOW 0x00
|
|
#define STATUS_HIGH 0x01
|
|
// 0x02..0x05 reserved
|
|
#define CONTROL_V1_V4 0x06
|
|
#define CONTROL_V5_V8 0x07
|
|
#define PWM_THRESHOLD_LSB 0x08
|
|
#define PWM_THRESHOLD_MSB 0x09
|
|
|
|
#define V_BASE 0x0A
|
|
#define V1_MSB 0x0A
|
|
#define V1_LSB 0x0B
|
|
#define V2_MSB 0x0C
|
|
#define V2_LSB 0x0D
|
|
#define V3_MSB 0x0E
|
|
#define V3_LSB 0x0F
|
|
#define V4_MSB 0x10
|
|
#define V4_LSB 0x11
|
|
#define V5_MSB 0x12
|
|
#define V5_LSB 0x13
|
|
#define V6_MSB 0x14
|
|
#define V6_LSB 0x15
|
|
#define V7_MSB 0x16
|
|
#define V7_LSB 0x17
|
|
#define V8_MSB 0x18
|
|
#define V8_lSB 0x19
|
|
|
|
#define T_INTERNAL_MSB 0x1A
|
|
#define T_INTERNAL_LSB 0x1B
|
|
#define VCC_MSB 0x1C
|
|
#define VCC_LSB 0x1D
|
|
|
|
|
|
/////////////////////////////////////////////////////
|
|
//
|
|
// MAGIC NUMBERS
|
|
//
|
|
// PAGE 21
|
|
const float SINGLE_ENDED_FACTOR = 2.5 / 8192; // 2^13
|
|
const float DIFFERENTIAL_FACTOR = 2.5 / 131072; // 2^17
|
|
const float VCC_FACTOR = 2.5 / 8192; // 2^13
|
|
const float TEMPERATURE_FACTOR = 1.0 / 16;
|
|
const float DIODE_VOLTAGE_FACTOR = 2.5 / 65536; // 2^16
|
|
|
|
|
|
/////////////////////////////////////////////////////
|
|
//
|
|
// CONSTRUCTORS
|
|
//
|
|
LTC2991::LTC2991(const uint8_t address, TwoWire *wire)
|
|
{
|
|
_address = address;
|
|
_wire = wire;
|
|
}
|
|
|
|
|
|
bool LTC2991::begin()
|
|
{
|
|
if (! isConnected()) return false;
|
|
return true;
|
|
}
|
|
|
|
|
|
bool LTC2991::isConnected()
|
|
{
|
|
_wire->beginTransmission(_address);
|
|
return ( _wire->endTransmission() == 0);
|
|
}
|
|
|
|
|
|
uint8_t LTC2991::getAddress()
|
|
{
|
|
return _address;
|
|
}
|
|
|
|
|
|
//
|
|
// CORE functions
|
|
//
|
|
bool LTC2991::new_data(uint8_t channel)
|
|
{
|
|
uint8_t x = _readRegister(STATUS_LOW);
|
|
// LTC2991_NEW_DATA / NONE
|
|
return (x & (1 << (channel - 1))) > 0;
|
|
}
|
|
|
|
|
|
bool LTC2991::new_temperature()
|
|
{
|
|
uint8_t x = _readRegister(STATUS_HIGH);
|
|
// LTC2991_NEW_DATA / NONE
|
|
return (x & 0x02) > 0;
|
|
}
|
|
|
|
|
|
bool LTC2991::new_voltage()
|
|
{
|
|
uint8_t x = _readRegister(STATUS_HIGH);
|
|
// LTC2991_NEW_DATA / ??
|
|
return (x & 0x01) > 0;
|
|
}
|
|
|
|
|
|
bool LTC2991::is_busy()
|
|
{
|
|
uint8_t x = _readRegister(STATUS_HIGH);
|
|
// LTC2991_BUSY / IDLE
|
|
return (x & 0x04) > 0;
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////
|
|
//
|
|
// EXTERNAL CHANNELS (8 voltage or 4 temperature)
|
|
//
|
|
void LTC2991::trigger_conversion(uint8_t n)
|
|
{
|
|
enable(n, true);
|
|
}
|
|
|
|
|
|
void LTC2991::trigger_conversion_all()
|
|
{
|
|
_setRegisterMask(STATUS_HIGH, 0xF0);
|
|
}
|
|
|
|
|
|
void LTC2991::enable(uint8_t n, bool enable)
|
|
{
|
|
if (enable) _setRegisterMask(STATUS_HIGH, (0x08 << n));
|
|
else _clrRegisterMask(STATUS_HIGH, (0x08 << n));
|
|
}
|
|
|
|
|
|
bool LTC2991::is_enabled(uint8_t n)
|
|
{
|
|
uint8_t x = _readRegister(STATUS_HIGH);
|
|
// LTC2991_TRIGGER_ENABLED / DISABLED
|
|
return (x & (0x08 << n)) > 0;
|
|
}
|
|
|
|
|
|
void LTC2991::enable_filter(uint8_t n, bool enable)
|
|
{
|
|
uint8_t reg = CONTROL_V1_V4;
|
|
if (n > 2)
|
|
{
|
|
reg++;
|
|
n -= 2;
|
|
}
|
|
uint8_t mask = 0x08;
|
|
if (n > 1) mask = 0x80;
|
|
if (enable) _setRegisterMask(reg, mask);
|
|
else _clrRegisterMask(reg, mask);
|
|
}
|
|
|
|
|
|
bool LTC2991::is_enabled_filter(uint8_t n)
|
|
{
|
|
uint8_t reg = CONTROL_V1_V4;
|
|
if (n > 2)
|
|
{
|
|
reg++;
|
|
n -= 2;
|
|
}
|
|
uint8_t mask = 0x08;
|
|
if (n > 1) mask = 0x80;
|
|
// LTC2991_FILTER_ENABLED / DISABLED
|
|
return _getRegisterMask(reg, mask) > 0;
|
|
}
|
|
|
|
|
|
// can be more efficient in one register addressing.
|
|
void LTC2991::set_Kelvin(uint8_t n)
|
|
{
|
|
set_temp_scale(n, true);
|
|
set_mode_temperature(n);
|
|
};
|
|
|
|
|
|
// can be more efficient in one register addressing.
|
|
void LTC2991::set_Celsius(uint8_t n)
|
|
{
|
|
set_temp_scale(n, false);
|
|
set_mode_temperature(n);
|
|
};
|
|
|
|
|
|
void LTC2991::set_temp_scale(uint8_t n, bool Kelvin)
|
|
{
|
|
uint8_t reg = CONTROL_V1_V4;
|
|
if (n > 2)
|
|
{
|
|
reg++;
|
|
n -= 2;
|
|
}
|
|
uint8_t mask = 0x04;
|
|
if (n > 1) mask = 0x40;
|
|
if (Kelvin) _setRegisterMask(reg, mask);
|
|
else _clrRegisterMask(reg, mask);
|
|
}
|
|
|
|
|
|
char LTC2991::get_temp_scale(uint8_t n)
|
|
{
|
|
uint8_t reg = CONTROL_V1_V4;
|
|
if (n > 2)
|
|
{
|
|
reg++;
|
|
n -= 2;
|
|
}
|
|
uint8_t mask = 0x04;
|
|
if (n > 1) mask = 0x40;
|
|
if (_getRegisterMask(reg, mask) > 0)
|
|
{
|
|
return 'K';
|
|
}
|
|
return 'C';
|
|
}
|
|
|
|
|
|
void LTC2991::set_mode_temperature(uint8_t n)
|
|
{
|
|
uint8_t reg = CONTROL_V1_V4;
|
|
if (n > 2)
|
|
{
|
|
reg++;
|
|
n -= 2;
|
|
}
|
|
uint8_t mask = 0x02;
|
|
if (n > 1) mask = 0x20;
|
|
_setRegisterMask(reg, mask);
|
|
}
|
|
|
|
|
|
void LTC2991::set_mode_voltage_differential(uint8_t n)
|
|
{
|
|
uint8_t reg = CONTROL_V1_V4;
|
|
if (n > 2)
|
|
{
|
|
reg++;
|
|
n -= 2;
|
|
}
|
|
uint8_t mask = 0x02; // 3 == voltage | differential
|
|
if (n > 1) mask = 0x20;
|
|
_clrRegisterMask(reg, mask);
|
|
mask >>= 1;
|
|
_setRegisterMask(reg, mask);
|
|
}
|
|
|
|
|
|
void LTC2991::set_mode_voltage_normal(uint8_t n)
|
|
{
|
|
uint8_t reg = CONTROL_V1_V4;
|
|
if (n > 2)
|
|
{
|
|
reg++;
|
|
n -= 2;
|
|
}
|
|
uint8_t mask = 0x02;
|
|
if (n > 1) mask = 0x20;
|
|
_clrRegisterMask(reg, mask);
|
|
mask >>= 1;
|
|
_clrRegisterMask(reg, mask);
|
|
}
|
|
|
|
|
|
uint8_t LTC2991::get_operational_mode(uint8_t n)
|
|
{
|
|
uint8_t reg = CONTROL_V1_V4;
|
|
if (n > 2)
|
|
{
|
|
reg++;
|
|
n -= 2;
|
|
}
|
|
uint8_t mask = 0x02;
|
|
if (n > 1) mask = 0x20;
|
|
if (_getRegisterMask(reg, mask) > 0) return 1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
uint8_t LTC2991::get_differential_mode(uint8_t n)
|
|
{
|
|
uint8_t reg = CONTROL_V1_V4;
|
|
if (n > 2)
|
|
{
|
|
reg++;
|
|
n -= 2;
|
|
}
|
|
uint8_t mask = 0x01;
|
|
if (n > 1) mask = 0x10;
|
|
// LTC2991_VOLTAGE_DIFF / NORMAL ???
|
|
if (_getRegisterMask(reg, mask) > 0) return 1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
float LTC2991::get_value(uint8_t channel)
|
|
{
|
|
uint8_t chan = channel - 1;
|
|
uint8_t pair = (channel + 1)/2;
|
|
int16_t v = _readRegister16(V_BASE + chan * 2);
|
|
|
|
if (get_operational_mode(pair) > 0) // temperature
|
|
{
|
|
if (get_temp_scale(pair) == 'K') // KELVIN
|
|
{
|
|
return TEMPERATURE_FACTOR * (float)v;
|
|
}
|
|
// CELSIUS positive
|
|
if ((v & 0x1000) == 0)
|
|
{
|
|
return TEMPERATURE_FACTOR * (float)v;
|
|
}
|
|
// CELSIUS neg two complements (page 13, 2nd column.)
|
|
v = (v^0x1FFF) + 1;
|
|
return TEMPERATURE_FACTOR * (float)v * -1.0;
|
|
}
|
|
|
|
if (get_differential_mode(pair) == 0) // SINGLE ENDED
|
|
{
|
|
if ((v & 0x4000) == 0)
|
|
{
|
|
return SINGLE_ENDED_FACTOR * (float)v;
|
|
}
|
|
v = (v^0x7FFFF) + 1;
|
|
return SINGLE_ENDED_FACTOR * (float)v * -1.0;
|
|
}
|
|
// DIFFERENTIAL
|
|
if ((v & 0x4000) == 0)
|
|
{
|
|
return DIFFERENTIAL_FACTOR * (float)v;
|
|
}
|
|
v = (v^0x7FFFF) + 1;
|
|
return DIFFERENTIAL_FACTOR * (float)v * -1.0;
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////
|
|
//
|
|
// PWM functions
|
|
//
|
|
void LTC2991::set_PWM(uint16_t value)
|
|
{
|
|
if (value > 511) value = 511;
|
|
_writeRegister(PWM_THRESHOLD_MSB, value >> 1);
|
|
if (value & 0x01) _setRegisterMask(PWM_THRESHOLD_LSB, 0x80);
|
|
else _clrRegisterMask(PWM_THRESHOLD_LSB, 0x80);
|
|
}
|
|
|
|
|
|
void LTC2991::set_PWM_fast(uint16_t value)
|
|
{
|
|
if (value > 511) value = 511;
|
|
_writeRegister(PWM_THRESHOLD_MSB, value >> 1);
|
|
// last bit is never set, only when value is zero
|
|
// to be sure there is no dangling bit.
|
|
if (value == 0) _clrRegisterMask(PWM_THRESHOLD_LSB, 0x80);
|
|
}
|
|
|
|
|
|
uint16_t LTC2991::get_PWM()
|
|
{
|
|
uint16_t pwm = _readRegister(PWM_THRESHOLD_MSB);
|
|
pwm <<= 1;
|
|
if (_readRegister(PWM_THRESHOLD_LSB) > 0 ) pwm |= 0x01;
|
|
return pwm;
|
|
}
|
|
|
|
|
|
void LTC2991::invert_PWM(bool invert)
|
|
{
|
|
if (invert) _setRegisterMask(PWM_THRESHOLD_LSB, 0x40);
|
|
else _clrRegisterMask(PWM_THRESHOLD_LSB, 0x40);
|
|
}
|
|
|
|
|
|
bool LTC2991::is_inverted_PWM()
|
|
{
|
|
// LTC2991_PWM_INVERTED / LTC2991_PWM_NORMAL
|
|
return _getRegisterMask(PWM_THRESHOLD_LSB, 0x40) > 0;
|
|
}
|
|
|
|
|
|
void LTC2991::enable_PWM(bool enable)
|
|
{
|
|
if (enable) _setRegisterMask(PWM_THRESHOLD_LSB, 0x20);
|
|
else _clrRegisterMask(PWM_THRESHOLD_LSB, 0x20);
|
|
}
|
|
|
|
|
|
bool LTC2991::is_enabled_PWM()
|
|
{
|
|
// LTC2991_PWM_ENABLED / LTC2991_PWM_DISABLED
|
|
return _getRegisterMask(PWM_THRESHOLD_LSB, 0x20) > 0;
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////
|
|
//
|
|
// CONFIGURATION
|
|
//
|
|
void LTC2991::set_acquisition_repeat()
|
|
{
|
|
_setRegisterMask(PWM_THRESHOLD_LSB, 0x10);
|
|
}
|
|
|
|
|
|
void LTC2991::set_acquisition_single()
|
|
{
|
|
_clrRegisterMask(PWM_THRESHOLD_LSB, 0x10);
|
|
}
|
|
|
|
|
|
uint8_t LTC2991::get_acquisition_mode()
|
|
{
|
|
// LTC2991_MODE_REPEAT / LTC2991_MODE_SINGLE
|
|
if (_getRegisterMask(PWM_THRESHOLD_LSB, 0x10) > 0) return 1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////
|
|
//
|
|
// INTERNAL SENSORS
|
|
//
|
|
void LTC2991::enable_Tintern_Vcc(bool enable)
|
|
{
|
|
if (enable) _setRegisterMask(STATUS_HIGH, 0x08);
|
|
else _clrRegisterMask(STATUS_HIGH, 0x08);
|
|
}
|
|
|
|
|
|
bool LTC2991::is_enabled_Tintern_Vcc()
|
|
{
|
|
uint8_t x = _readRegister(STATUS_HIGH);
|
|
// LTC2991_TINTERN_ENABLED / DISABLED
|
|
return ((x & 0x08) > 0);
|
|
}
|
|
|
|
|
|
void LTC2991::enable_filter_Tintern(bool enable)
|
|
{
|
|
if (enable) _setRegisterMask(PWM_THRESHOLD_LSB, 0x08);
|
|
else _clrRegisterMask(PWM_THRESHOLD_LSB, 0x08);
|
|
}
|
|
|
|
|
|
bool LTC2991::is_enabled_filter_Tintern()
|
|
{
|
|
// LTC2991_TINTERN_FILTER_ENABLED / DISABLED
|
|
return _getRegisterMask(PWM_THRESHOLD_LSB, 0x08) > 0;
|
|
}
|
|
|
|
|
|
void LTC2991::set_Kelvin_Tintern()
|
|
{
|
|
set_temp_scale_Tintern(true);
|
|
}
|
|
|
|
|
|
void LTC2991::set_Celsius_Tintern()
|
|
{
|
|
set_temp_scale_Tintern(false);
|
|
}
|
|
|
|
|
|
// true = Kelvin, false = Celsius
|
|
void LTC2991::set_temp_scale_Tintern(bool Kelvin)
|
|
{
|
|
if (Kelvin) _setRegisterMask(PWM_THRESHOLD_LSB, 0x04);
|
|
else _clrRegisterMask(PWM_THRESHOLD_LSB, 0x04);
|
|
}
|
|
|
|
|
|
char LTC2991::get_temp_scale_Tintern()
|
|
{
|
|
if (_getRegisterMask(PWM_THRESHOLD_LSB, 0x04) > 0)
|
|
{
|
|
return 'K'; // LTC2991_KELVIN
|
|
}
|
|
return 'C'; // LTC2991_CELSIUS
|
|
}
|
|
|
|
|
|
float LTC2991::get_Tintern()
|
|
{
|
|
int16_t v = _readRegister16(T_INTERNAL_MSB);
|
|
|
|
if (get_temp_scale_Tintern() == 'K')
|
|
{
|
|
return TEMPERATURE_FACTOR * (float)v;
|
|
}
|
|
// CELSIUS positive value
|
|
if ((v & 0x1000) == 0)
|
|
{
|
|
return TEMPERATURE_FACTOR * (float)v;
|
|
}
|
|
// CELSIUS neg two complements (page 13, 2nd colom.)
|
|
v = (v^0x1FFF) + 1;
|
|
return TEMPERATURE_FACTOR * (float)v * -1.0;
|
|
}
|
|
|
|
|
|
float LTC2991::get_VCC()
|
|
{
|
|
int16_t v = _readRegister16(VCC_MSB);
|
|
if ((v & 0x4000) == 0)
|
|
{
|
|
return VCC_FACTOR * (float)v + 2.5;
|
|
}
|
|
// can Vcc be negative?
|
|
v = (v^0x7FFFF) + 1;
|
|
return VCC_FACTOR * (float)v * -1.0 + 2.5;
|
|
}
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////
|
|
//
|
|
// PRIVATE functions
|
|
//
|
|
uint8_t LTC2991::_writeRegister(const uint8_t reg, const uint8_t value)
|
|
{
|
|
_wire->beginTransmission(_address);
|
|
_wire->write(reg);
|
|
_wire->write(value);
|
|
return _wire->endTransmission();
|
|
}
|
|
|
|
|
|
uint8_t LTC2991::_readRegister(const uint8_t reg)
|
|
{
|
|
_wire->beginTransmission(_address);
|
|
_wire->write(reg);
|
|
_wire->endTransmission();
|
|
|
|
_wire->requestFrom(_address, (uint8_t)1);
|
|
return _wire->read();
|
|
}
|
|
|
|
|
|
uint16_t LTC2991::_readRegister16(const uint8_t reg)
|
|
{
|
|
uint16_t x = _readRegister(reg) << 8;
|
|
x |= _readRegister(reg + 1);
|
|
// bool dataValid = (x & 0x8000) > 0; // TODO error handling
|
|
x &= 0x7FFF;
|
|
return x;
|
|
}
|
|
|
|
|
|
void LTC2991::_setRegisterMask(const uint8_t reg, uint8_t mask)
|
|
{
|
|
uint8_t x = _readRegister(reg);
|
|
if ((x & mask) != mask) // if not all bits set, set them
|
|
{
|
|
x |= mask;
|
|
_writeRegister(reg, x);
|
|
}
|
|
}
|
|
|
|
|
|
void LTC2991::_clrRegisterMask(const uint8_t reg, uint8_t mask)
|
|
{
|
|
uint8_t x = _readRegister(reg);
|
|
if (x | mask) // if any bit of the mask set clear it
|
|
{
|
|
x &= ~mask;
|
|
_writeRegister(reg, x);
|
|
}
|
|
}
|
|
|
|
|
|
uint8_t LTC2991::_getRegisterMask(const uint8_t reg, uint8_t mask)
|
|
{
|
|
uint8_t x = _readRegister(reg);
|
|
return x & mask;
|
|
}
|
|
|
|
|
|
// -- END OF FILE --
|
|
|