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Root4root_INA219.h
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/** INSPIRED BY Adafruit_INA219 library **/
#ifndef _LIB_ROOT4ROOT_INA219_
#define _LIB_ROOT4ROOT_INA219_
#include <Arduino.h>
#include <Wire.h>
#define DEBUG 0;
#define DEFAULT_MAX_EXPECTED_CURRENT 2000 //mA
#define DEFAULT_SHUNT_RESISTOR 100 //mOhm
/** default I2C address **/
#define INA219_ADDRESS (0x40) // 0100 0000 (A0 + A1 = GND) - DEFAULT
/** reset bit **/
#define INA219_CONFIG_RESET 0x8000 // 1000 0000 0000 0000
/** bus voltage range values **/
enum {
INA219_CONFIG_BUS_VOLTAGE_RANGE_16V = (0x0000), // 0-16V Range
INA219_CONFIG_BUS_VOLTAGE_RANGE_32V = (0x2000), // 0-32V Range - DEFAULT
};
/** values for gain bits **/
enum {
INA219_CONFIG_PGA_GAIN_1_40MV = (0x0000), // Gain 1, 40mV Range
INA219_CONFIG_PGA_GAIN_2_80MV = (0x0800), // Gain 2, 80mV Range
INA219_CONFIG_PGA_GAIN_4_160MV = (0x1000), // Gain 4, 160mV Range
INA219_CONFIG_PGA_GAIN_8_320MV = (0x1800), // Gain 8, 320mV Range - DEFAULT
};
/** values for bus ADC resolution **/
enum {
// 9-bit bus res = 0..511
INA219_CONFIG_BUS_ADC_RESESOLUTION_9BIT = (0x0000), // 0000 0000 0000 0000
// 10-bit bus res = 0..1023
INA219_CONFIG_BUS_ADC_RESESOLUTION_10BIT = (0x0080), // 0000 0000 1000 0000
//11-bit bus res = 0..2047
INA219_CONFIG_BUS_ADC_RESESOLUTION_11BIT = (0x0100), // 0000 0001 0000 0000
//12-bit bus res = 0..4095
INA219_CONFIG_BUS_ADC_RESESOLUTION_12BIT = (0x0180), // 0000 0001 1000 0000 - DEFAULT
};
/** values for shunt ADC resolution **/
enum {
// 1 x 9-bit shunt sample
INA219_CONFIG_SHUNT_ADC_RESOLUTION_9BIT_1S_84US = (0x0000), // 0000 0000 0000 0000
// 1 x 10-bit shunt sample
INA219_CONFIG_SHUNT_ADC_RESOLUTION_10BIT_1S_148US = (0x0008), // 0000 0000 0000 1000
// 1 x 11-bit shunt sample
INA219_CONFIG_SHUNT_ADC_RESOLUTION_11BIT_1S_276US = (0x0010), // 0000 0000 0001 0000
// 1 x 12-bit shunt sample - DEFAULT
INA219_CONFIG_SHUNT_ADC_RESOLUTION_12BIT_1S_532US = (0x0018), // 0000 0000 0001 1000
// 2 x 12-bit shunt samples averaged together
INA219_CONFIG_SHUNT_ADC_RESOLUTION_12BIT_2S_1060US = (0x0048), // 0000 0000 0100 1000
// 4 x 12-bit shunt samples averaged together
INA219_CONFIG_SHUNT_ADC_RESOLUTION_12BIT_4S_2130US = (0x0050), // 0000 0000 0101 0000
// 8 x 12-bit shunt samples averaged together
INA219_CONFIG_SHUNT_ADC_RESOLUTION_12BIT_8S_4260US = (0x0058), // 0000 0000 0101 1000
// 16 x 12-bit shunt samples averaged together
INA219_CONFIG_SHUNT_ADC_RESOLUTION_12BIT_16S_8510US = (0x0060), // 0000 0000 0110 0000
// 32 x 12-bit shunt samples averaged together
INA219_CONFIG_SHUNT_ADC_RESOLUTION_12BIT_32S_17MS = (0x0068), // 0000 0000 0110 1000
// 64 x 12-bit shunt samples averaged together
INA219_CONFIG_SHUNT_ADC_RESOLUTION_12BIT_64S_34MS = (0x0070), // 0000 0000 0111 0000
// 128 x 12-bit shunt samples averaged together
INA219_CONFIG_SHUNT_ADC_RESOLUTION_12BIT_128S_69MS = (0x0078), // 0000 0000 0111 1000
};
/** values for operating mode **/
enum {
INA219_CONFIG_MODE_POWERDOWN, // 0000
INA219_CONFIG_MODE_SHUNT_VOLTAGE_TRIGGERED, // 0001
INA219_CONFIG_MODE_BUS_VOLTAGE_TRIGGERED, // 0010
INA219_CONFIG_MODE_SHUNT_AND_BUS_VOLTAGE_TRIGGERED, // 0011
INA219_CONFIG_MODE_ADC_OFF, // 0100
INA219_CONFIG_MODE_SHUNT_VOLTAGE_CONTINUOUS, // 0101
INA219_CONFIG_MODE_BUS_VOLTAGE_CONTINUOUS, // 0110
INA219_CONFIG_MODE_SHUNT_AND_BUS_VOLTAGE_CONTINUOUS // 0111
};
//Config masks
enum {
INA219_CONFIG_BUS_VOLTAGE_RANGE_MASK = (0x2000), //0010 0000 0000 0000
INA219_CONFIG_PGA_GAIN_MASK = (0x1800), //0001 1000 0000 0000
INA219_CONFIG_BUS_ADC_RESESOLUTION_MASK = (0x0780), //0000 0111 1000 0000
INA219_CONFIG_SHUNT_ADC_RESOLUTION_MASK = (0x0078), //0000 0000 0111 1000
INA219_CONFIG_MODE_MASK = (0x0007) //0000 0000 0000 0111
};
//Registers
enum {
INA219_CONFIG_REGISTER = (0x00),
INA219_SHUNT_VOLTAGE_REGISTER = (0x01),
INA219_BUS_VOLTAGE_REGISTER = (0x02),
INA219_POWER_REGISTER = (0x03),
INA219_CURRENT_REGISTER = (0x04),
INA219_CALIBRATION_REGISTER = (0x05)
};
class Root4root_INA219 {
public:
Root4root_INA219(uint8_t addr = INA219_ADDRESS, TwoWire *theWire = &Wire);
void begin(uint16_t expected = DEFAULT_MAX_EXPECTED_CURRENT, byte rshunt = DEFAULT_SHUNT_RESISTOR);
void setCalibration(uint16_t expected, uint8_t rshunt);
void changeConfig(uint16_t value, uint16_t mask);
uint16_t getBusVoltage_mV();
float getBusVoltage_V();
int16_t getShuntVoltage_raw();
float getShuntVoltage_mV();
float getCurrent_mA();
int16_t getCurrent_raw();
float getPower_mW();
int16_t getPower_raw();
void powerSave(bool on);
void reset();
/* Mostly used for testing purposes */
void writeRegister(uint8_t reg, uint16_t value);
void readRegister(uint8_t reg, uint16_t *value);
void trigger();
private:
TwoWire * i2c = NULL;
uint8_t ina219_i2caddr = 0;
uint16_t ina219_config = (0x399F); //0011 1001 1001 1111 - DEFAULT CONFIG
uint16_t ina219_calibrationValue = (0x1A36); // 0001 1010 0011 0110 - DEFAULT FOR INA219 Adafruit modules.
float ina219_currentLSB = 0.0610352;
float ina219_powerLSB = 1.220704;
bool checkConfig();
};
#endif //_LIB_ROOT4ROOT_INA219_