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326 lines
7.1 KiB
C++
326 lines
7.1 KiB
C++
// FILE: INA219.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.0
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// DATE: 2021-05-18
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// PURPOSE: Arduino library for INA219 voltage, current and power sensor
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// URL: https://github.com/RobTillaart/INA219
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#include "INA219.h"
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// REGISTER ADDRESSES
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#define INA219_CONFIGURATION 0x00
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#define INA219_SHUNT_VOLTAGE 0x01
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#define INA219_BUS_VOLTAGE 0x02
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#define INA219_POWER 0x03
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#define INA219_CURRENT 0x04
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#define INA219_CALIBRATION 0x05
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#define INA219_MASK_ENABLE 0x06
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#define INA219_ALERT_LIMIT 0x07
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#define INA219_MANUFACTURER 0xFE
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#define INA219_DIE_ID 0xFF
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// CONFIGURATION REGISTER MASKS
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#define INA219_CONF_RESET 0x8000
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#define INA219_CONF_BUS_RANGE_VOLTAGE 0x2000
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#define INA219_CONF_PROG_GAIN 0x1800
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#define INA219_CONF_BUS_ADC 0x0780
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#define INA219_CONF_SHUNT_ADC 0x0078
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#define INA219_CONF_MODE 0x0007
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////////////////////////////////////////////////////////
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//
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// CONSTRUCTOR
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//
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INA219::INA219(const uint8_t address, TwoWire *wire)
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{
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_address = address;
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_wire = wire;
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// not calibrated values by default.
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_current_LSB = 0;
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_maxCurrent = 0;
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_shunt = 0;
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}
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bool INA219::begin()
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{
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if (! isConnected()) return false;
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return true;
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}
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bool INA219::isConnected()
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{
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if ((_address < 0x40) || (_address > 0x4F)) return false;
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_wire->beginTransmission(_address);
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return ( _wire->endTransmission() == 0);
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}
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uint8_t INA219::getAddress()
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{
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return _address;
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}
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////////////////////////////////////////////////////////
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//
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// CORE FUNCTIONS
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//
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float INA219::getShuntVoltage()
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{
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uint16_t value = _readRegister(INA219_SHUNT_VOLTAGE);
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return value * 1e-5; // fixed 10 uV
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}
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float INA219::getBusVoltage()
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{
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uint16_t value = _readRegister(INA219_BUS_VOLTAGE);
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uint8_t flags = value & 0x03;
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// math overflow handling
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if (flags & 0x01) return -100;
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// if flags && 0x02 ==> convert flag; not handled
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float voltage = (value >> 3) * 4e-3; // fixed 4 mV
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return voltage;
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}
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float INA219::getPower()
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{
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uint16_t value = _readRegister(INA219_POWER);
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return value * 20 * _current_LSB;
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}
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// TODO CHECK
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// needs _current_LSB factor?
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float INA219::getCurrent()
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{
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int16_t value = _readRegister(INA219_CURRENT);
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return value * _current_LSB;
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}
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bool INA219::getMathOverflowFlag()
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{
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uint16_t value = _readRegister(INA219_BUS_VOLTAGE);
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return ((value & 0x0001) == 0x0001);
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}
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bool INA219::getConversionFlag()
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{
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uint16_t value = _readRegister(INA219_BUS_VOLTAGE);
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return ((value & 0x0002) == 0x0002);
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}
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////////////////////////////////////////////////////////
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//
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// CONFIGURATION
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//
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void INA219::reset()
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{
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uint16_t config = _readRegister(INA219_CONFIGURATION);
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config |= 0x8000;
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_writeRegister(INA219_CONFIGURATION, config);
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// reset calibration
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_current_LSB = 0;
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_maxCurrent = 0;
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_shunt = 0;
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}
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bool INA219::setBusVoltageRange(uint8_t voltage)
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{
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if (voltage > 32) return false;
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if (voltage > 16) voltage = 32;
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else voltage = 16;
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uint16_t config = _readRegister(INA219_CONFIGURATION);
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config &= ~INA219_CONF_BUS_RANGE_VOLTAGE;
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if (voltage == 32) config |= INA219_CONF_BUS_RANGE_VOLTAGE;
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_writeRegister(INA219_CONFIGURATION, config);
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return true;
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}
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uint8_t INA219::getBusVoltageRange()
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{
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uint16_t config = _readRegister(INA219_CONFIGURATION);
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if (config & INA219_CONF_BUS_RANGE_VOLTAGE) return 32;
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return 16; // volts
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}
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bool INA219::setGain(uint8_t factor)
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{
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if (factor != 1 && factor != 2 && factor != 4 && factor != 8)
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{
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return false;
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}
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uint16_t config = _readRegister(INA219_CONFIGURATION);
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config &= ~INA219_CONF_PROG_GAIN;
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if (factor == 2) config |= (1 << 11);
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else if (factor == 4) config |= (2 << 11);
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else if (factor == 8) config |= (3 << 11);
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_writeRegister(INA219_CONFIGURATION, config);
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return true;
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}
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uint8_t INA219::getGain()
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{
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uint16_t config = _readRegister(INA219_CONFIGURATION);
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uint16_t mask = (config & INA219_CONF_PROG_GAIN);
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if (mask == 0x0000) return 1;
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else if (mask == 0x0800) return 2;
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else if (mask == 0x1000) return 4;
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return 8;
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}
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bool INA219::setBusADC(uint8_t mask)
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{
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if (mask > 0x0F) return false;
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// TODO improve this one. datasheet.
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// two functions
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// setBusResolution + setBusSamples()
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uint16_t config = _readRegister(INA219_CONFIGURATION);
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config &= ~INA219_CONF_BUS_ADC;
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config |= (mask << 7);
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// if (bits == 10) config |= (1 << 7);
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// else if (bits == 11) config |= (2 << 7);
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// else if (bits == 12) config |= (3 << 7);
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_writeRegister(INA219_CONFIGURATION, config);
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return true;
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}
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uint8_t INA219::getBusADC()
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{
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uint16_t config = _readRegister(INA219_CONFIGURATION);
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config &= INA219_CONF_BUS_ADC;
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return config >> 7;
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}
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bool INA219::setShuntADC(uint8_t mask)
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{
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if (mask > 0x0F) return false;
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// TODO improve this one. datasheet.
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// two functions
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// setShuntResolution + setShuntSamples()
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uint16_t config = _readRegister(INA219_CONFIGURATION);
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config &= ~INA219_CONF_SHUNT_ADC;
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config |= (mask << 3);
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_writeRegister(INA219_CONFIGURATION, config);
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return true;
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}
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uint8_t INA219::getShuntADC()
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{
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uint16_t config = _readRegister(INA219_CONFIGURATION);
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config &= INA219_CONF_SHUNT_ADC;
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return config >> 3;
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}
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bool INA219::setMode(uint8_t mode)
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{
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if (mode > 7) return false;
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uint16_t config = _readRegister(INA219_CONFIGURATION);
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config &= ~INA219_CONF_MODE;
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config |= mode;
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_writeRegister(INA219_CONFIGURATION, config);
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return true;
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}
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uint8_t INA219::getMode()
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{
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uint16_t config = _readRegister(INA219_CONFIGURATION);
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config &= INA219_CONF_MODE;
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return config;
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}
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////////////////////////////////////////////////////////
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//
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// CALIBRATION
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//
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bool INA219::setMaxCurrentShunt(float maxCurrent, float shunt)
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{
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// #define printdebug
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uint16_t calib = 0;
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if (maxCurrent < 0.001) return false;
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if (shunt < 0.001) return false;
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// _current_LSB = maxCurrent / 32768;
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_current_LSB = maxCurrent * 3.0517578125e-5;
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_maxCurrent = maxCurrent;
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_shunt = shunt;
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calib = round(0.04096 / (_current_LSB * shunt));
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_writeRegister(INA219_CALIBRATION, calib);
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#ifdef printdebug
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Serial.println();
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Serial.print("current_LSB:\t");
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Serial.print(_current_LSB, 8);
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Serial.println(" uA / bit");
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Serial.print("Calibration:\t");
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Serial.println(calib);
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Serial.print("Max current:\t");
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Serial.print(_maxCurrent, 3);
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Serial.println(" A");
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Serial.print("Shunt:\t");
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Serial.print(_shunt, 8);
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Serial.println(" ohm Ω");
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#endif
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return true;
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}
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////////////////////////////////////////////////////////
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//
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// PRIVATE
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//
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uint16_t INA219::_readRegister(uint8_t reg)
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{
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_wire->beginTransmission(_address);
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_wire->write(reg);
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_wire->endTransmission();
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_wire->requestFrom(_address, (uint8_t)2);
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uint16_t value = _wire->read();
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value <<= 8;
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value |= _wire->read();
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return value;
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}
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uint16_t INA219::_writeRegister(uint8_t reg, uint16_t value)
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{
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_wire->beginTransmission(_address);
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_wire->write(reg);
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_wire->write(value >> 8);
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_wire->write(value & 0xFF);
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return _wire->endTransmission();
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}
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// -- END OF FILE --
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