alanbjohnston
7 years ago
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/*!
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* @file Adafruit_INA219.h
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*
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* This is a library for the Adafruit INA219 breakout board
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* ----> https://www.adafruit.com/products/904
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*
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* Adafruit invests time and resources providing this open source code,
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* please support Adafruit and open-source hardware by purchasing
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* products from Adafruit!
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*
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* Written by Kevin "KTOWN" Townsend for Adafruit Industries.
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*
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* BSD license, all text here must be included in any redistribution.
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*
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* Converted to C for Raspberry Pi by Alan Johnston KU2Y
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*
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*/
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#include <wiringPi.h>
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/** default I2C address **/
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#define INA219_ADDRESS (0x40) // 1000000 (A0+A1=GND)
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/** read **/
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#define INA219_READ (0x01)
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/*=========================================================================
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CONFIG REGISTER (R/W)
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**************************************************************************/
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/** config register address **/
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#define INA219_REG_CONFIG (0x00)
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/** reset bit **/
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#define INA219_CONFIG_RESET (0x8000) // Reset Bit
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/** mask for bus voltage range **/
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#define INA219_CONFIG_BVOLTAGERANGE_MASK (0x2000) // Bus Voltage Range Mask
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/** bus voltage range values **/
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enum {
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INA219_CONFIG_BVOLTAGERANGE_16V = (0x0000), // 0-16V Range
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INA219_CONFIG_BVOLTAGERANGE_32V = (0x2000), // 0-32V Range
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};
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/** mask for gain bits **/
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#define INA219_CONFIG_GAIN_MASK (0x1800) // Gain Mask
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/** values for gain bits **/
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enum {
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INA219_CONFIG_GAIN_1_40MV = (0x0000), // Gain 1, 40mV Range
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INA219_CONFIG_GAIN_2_80MV = (0x0800), // Gain 2, 80mV Range
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INA219_CONFIG_GAIN_4_160MV = (0x1000), // Gain 4, 160mV Range
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INA219_CONFIG_GAIN_8_320MV = (0x1800), // Gain 8, 320mV Range
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};
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/** mask for bus ADC resolution bits **/
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#define INA219_CONFIG_BADCRES_MASK (0x0780)
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/** values for bus ADC resolution **/
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enum {
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INA219_CONFIG_BADCRES_9BIT = (0x0000), // 9-bit bus res = 0..511
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INA219_CONFIG_BADCRES_10BIT = (0x0080), // 10-bit bus res = 0..1023
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INA219_CONFIG_BADCRES_11BIT = (0x0100), // 11-bit bus res = 0..2047
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INA219_CONFIG_BADCRES_12BIT = (0x0180), // 12-bit bus res = 0..4097
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};
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/** mask for shunt ADC resolution bits **/
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#define INA219_CONFIG_SADCRES_MASK \
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(0x0078) // Shunt ADC Resolution and Averaging Mask
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/** values for shunt ADC resolution **/
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enum {
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INA219_CONFIG_SADCRES_9BIT_1S_84US = (0x0000), // 1 x 9-bit shunt sample
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INA219_CONFIG_SADCRES_10BIT_1S_148US = (0x0008), // 1 x 10-bit shunt sample
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INA219_CONFIG_SADCRES_11BIT_1S_276US = (0x0010), // 1 x 11-bit shunt sample
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INA219_CONFIG_SADCRES_12BIT_1S_532US = (0x0018), // 1 x 12-bit shunt sample
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INA219_CONFIG_SADCRES_12BIT_2S_1060US =
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(0x0048), // 2 x 12-bit shunt samples averaged together
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INA219_CONFIG_SADCRES_12BIT_4S_2130US =
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(0x0050), // 4 x 12-bit shunt samples averaged together
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INA219_CONFIG_SADCRES_12BIT_8S_4260US =
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(0x0058), // 8 x 12-bit shunt samples averaged together
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INA219_CONFIG_SADCRES_12BIT_16S_8510US =
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(0x0060), // 16 x 12-bit shunt samples averaged together
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INA219_CONFIG_SADCRES_12BIT_32S_17MS =
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(0x0068), // 32 x 12-bit shunt samples averaged together
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INA219_CONFIG_SADCRES_12BIT_64S_34MS =
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(0x0070), // 64 x 12-bit shunt samples averaged together
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INA219_CONFIG_SADCRES_12BIT_128S_69MS =
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(0x0078), // 128 x 12-bit shunt samples averaged together
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};
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/** mask for operating mode bits **/
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#define INA219_CONFIG_MODE_MASK (0x0007) // Operating Mode Mask
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/** values for operating mode **/
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enum {
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INA219_CONFIG_MODE_POWERDOWN,
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INA219_CONFIG_MODE_SVOLT_TRIGGERED,
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INA219_CONFIG_MODE_BVOLT_TRIGGERED,
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INA219_CONFIG_MODE_SANDBVOLT_TRIGGERED,
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INA219_CONFIG_MODE_ADCOFF,
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INA219_CONFIG_MODE_SVOLT_CONTINUOUS,
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INA219_CONFIG_MODE_BVOLT_CONTINUOUS,
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INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS
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};
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/** shunt voltage register **/
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#define INA219_REG_SHUNTVOLTAGE (0x01)
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/** bus voltage register **/
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#define INA219_REG_BUSVOLTAGE (0x02)
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/** power register **/
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#define INA219_REG_POWER (0x03)
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/** current register **/
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#define INA219_REG_CURRENT (0x04)
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/** calibration register **/
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#define INA219_REG_CALIBRATION (0x05)
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/*!
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* functions for interacting with INA219
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* current/power monitor IC
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*/
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//void begin(TwoWire *theWire = &Wire);
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void setCalibration_32V_2A(int fd);
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void setCalibration_32V_1A(int fd);
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void setCalibration_16V_400mA(int fd);
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void setCalibration_16V_2A(int fd);
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float getBusVoltage_V(int fd);
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float getShuntVoltage_mV(int fd);
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float getCurrent_mA(int fd);
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float getPower_mW(int fd);
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void powerSave(int fd, int on);
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uint8_t ina219_i2caddr;
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//uint32_t ina219_calValue;
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uint16_t ina219_calValue;
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uint16_t ina219_config;
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// The following multipliers are used to convert raw current and power
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// values to mA and mW, taking into account the current config settings
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uint32_t ina219_currentDivider_mA;
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float ina219_powerMultiplier_mW;
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void init();
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void wireWriteRegister(int fd, uint8_t reg, uint16_t value);
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uint16_t wireReadRegister(int fd, uint8_t reg);
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int16_t getBusVoltage_raw(int fd);
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int16_t getShuntVoltage_raw(int fd);
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int16_t getCurrent_raw(int fd);
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int16_t getPower_raw(int fd);
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