/*
xsns_13_ina219.ino - INA219 & ISL28022 Current Sensor support for Tasmota
Copyright (C) 2021 Stefan Bode and Theo Arends
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see .
*/
#ifdef USE_I2C
#ifdef USE_INA219
/*********************************************************************************************\
* INA219 - Low voltage (max 32V!) Current sensor
* Supports also ISL28022
*
* Source: Adafruit Industries
*
* I2C Address: 0x40, 0x41 0x44 or 0x45
\*********************************************************************************************/
#define XSNS_13 13
#define XI2C_14 14 // See I2CDEVICES.md
#define INA219_MAX_COUNT 4
#define INA219_ADDRESS1 (0x40) // 1000000 (A0+A1=GND)
#define INA219_ADDRESS2 (0x41) // 1000000 (A0=Vcc, A1=GND)
#define INA219_ADDRESS3 (0x44) // 1000000 (A0=GND, A1=Vcc)
#define INA219_ADDRESS4 (0x45) // 1000000 (A0+A1=Vcc)
#define INA219_READ (0x01)
#define INA219_REG_CONFIG (0x00)
#define INA219_CONFIG_RESET (0x8000) // Reset Bit
#define INA219_CONFIG_BVOLTAGERANGE_MASK (0x2000) // Bus Voltage Range Mask
#define INA219_CONFIG_BVOLTAGERANGE_16V (0x0000) // 0-16V Range
#define INA219_CONFIG_BVOLTAGERANGE_32V (0x2000) // 0-32V Range
#define ISL28022_CONFIG_BVOLTAGERANGE_60V (0x6000) // 0-60V Range for ISL28022
#define INA219_CONFIG_GAIN_MASK (0x1800) // Gain Mask
#define INA219_CONFIG_GAIN_1_40MV (0x0000) // Gain 1, 40mV Range
#define INA219_CONFIG_GAIN_2_80MV (0x0800) // Gain 2, 80mV Range
#define INA219_CONFIG_GAIN_4_160MV (0x1000) // Gain 4, 160mV Range
#define INA219_CONFIG_GAIN_8_320MV (0x1800) // Gain 8, 320mV Range
#define INA219_CONFIG_BADCRES_MASK (0x0780) // Bus ADC Resolution Mask
#define INA219_CONFIG_BADCRES_9BIT_1S_84US (0x0<<7) // 9-bit bus res = 0..511
#define INA219_CONFIG_BADCRES_10BIT_1S_148US (0x1<<7) // 10-bit bus res = 0..1023
#define INA219_CONFIG_BADCRES_11BIT_1S_276US (0x2<<7) // 11-bit bus res = 0..2047
#define INA219_CONFIG_BADCRES_12BIT_1S_532US (0x3<<7) // 12-bit bus res = 0..4097
#define INA219_CONFIG_BADCRES_12BIT_2S_1060US (0x9<<7) // 2 x 12-bit bus samples averaged together
#define INA219_CONFIG_BADCRES_12BIT_4S_2130US (0xA<<7) // 4 x 12-bit bus samples averaged together
#define INA219_CONFIG_BADCRES_12BIT_8S_4260US (0xB<<7) // 8 x 12-bit bus samples averaged together
#define INA219_CONFIG_BADCRES_12BIT_16S_8510US (0xC<<7) // 16 x 12-bit bus samples averaged together
#define INA219_CONFIG_BADCRES_12BIT_32S_17MS (0xD<<7) // 32 x 12-bit bus samples averaged together
#define INA219_CONFIG_BADCRES_12BIT_64S_34MS (0xE<<7) // 64 x 12-bit bus samples averaged together
#define INA219_CONFIG_BADCRES_12BIT_128S_69MS (0xF<<7) // 128 x 12-bit bus samples averaged together
// Note: for IS28022, the ADC has 3 more bits and approximatively similar conversion times
#define INA219_CONFIG_SADCRES_MASK (0x0078) // Shunt ADC Resolution and Averaging Mask
#define INA219_CONFIG_SADCRES_9BIT_1S_84US (0x0<<3) // 1 x 9-bit shunt sample
#define INA219_CONFIG_SADCRES_10BIT_1S_148US (0x1<<3) // 1 x 10-bit shunt sample
#define INA219_CONFIG_SADCRES_11BIT_1S_276US (0x2<<3) // 1 x 11-bit shunt sample
#define INA219_CONFIG_SADCRES_12BIT_1S_532US (0x3<<3) // 1 x 12-bit shunt sample
#define INA219_CONFIG_SADCRES_12BIT_2S_1060US (0x9<<3) // 2 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_4S_2130US (0xA<<3) // 4 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_8S_4260US (0xB<<3) // 8 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_16S_8510US (0xC<<3) // 16 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_32S_17MS (0xD<<3) // 32 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_64S_34MS (0xE<<3) // 64 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_128S_69MS (0xF<<3) // 128 x 12-bit shunt samples averaged together
#define INA219_CONFIG_MODE_MASK (0x0007) // Operating Mode Mask
#define INA219_CONFIG_MODE_POWERDOWN (0x0000)
#define INA219_CONFIG_MODE_SVOLT_TRIGGERED (0x0001)
#define INA219_CONFIG_MODE_BVOLT_TRIGGERED (0x0002)
#define INA219_CONFIG_MODE_SANDBVOLT_TRIGGERED (0x0003)
#define INA219_CONFIG_MODE_ADCOFF (0x0004)
#define INA219_CONFIG_MODE_SVOLT_CONTINUOUS (0x0005)
#define INA219_CONFIG_MODE_BVOLT_CONTINUOUS (0x0006)
#define INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS (0x0007)
#define INA219_REG_SHUNTVOLTAGE (0x01)
#define INA219_REG_BUSVOLTAGE (0x02)
#define INA219_REG_POWER (0x03)
#define INA219_REG_CURRENT (0x04)
#define INA219_REG_CALIBRATION (0x05)
#define ISL28022_REG_SHUNTTHRESHOLD (0x06)
#define ISL28022_REG_BUSTHRESHOLD (0x07)
#define ISL28022_REG_INTRSTATUS (0x08)
#define ISL28022_REG_AUXCTRL (0x09)
#define INA219_DEFAULT_SHUNT_RESISTOR_MILLIOHMS (100.0) // 0.1 Ohm
#ifdef DEBUG_TASMOTA_SENSOR
// temporary strings for floating point in debug messages
char __ina219_dbg1[10];
char __ina219_dbg2[10];
#endif
#define INA219_ACTIVE 1
#define ISL28022_ACTIVE 2
struct INA219_Channel_Data {
float voltage;
float current;
uint8_t active;
uint8_t valid;
};
struct INA219_Data {
struct INA219_Channel_Data chan[INA219_MAX_COUNT];
// The following multiplier is used to convert shunt voltage (in mV) to current (in A)
// Current_A = ShuntVoltage_mV / ShuntResistor_milliOhms = ShuntVoltage_mV * ina219_current_multiplier
// ina219_current_multiplier = 1 / ShuntResistor_milliOhms
float current_multiplier;
uint8_t count;
};
struct INA219_Data *Ina219Data = nullptr;
const char *INA219_TYPE[] = { "INA219", "ISL28022" };
const uint8_t INA219_ADDRESSES[] = { INA219_ADDRESS1, INA219_ADDRESS2, INA219_ADDRESS3, INA219_ADDRESS4 };
/*********************************************************************************************\
* Calculate current multiplier depending on the selected mode
* For mode = 0, 1, 2 : legacy modes simplified as Vmax: 32V, Imax: 3.2A range
* For mode = 10..255 : specify Rshunt encoded as RRM where resistor value is RR * 10^M milliOhms
* Vmax: 32V, Imax: 0.320 / Rshunt
* Exemple:
* 10: Rshunt = 1 * 10^0 = 1 millOhms => Max current = 320A !
* 11: Rshunt = 1 * 10^1 = 10 milliOhms => Max current = 32A
* 21: Rshunt = 2 * 10^1 = 20 milliOhms => Max current = 16A
* 12: Rshunt = 1 * 10^2 = 100 milliOhms => Max current = 3.2A == mode 0,1,2
* 13: Rshunt = 1 * 10^3 = 1 Ohms => Max current = 320mA
* Note that some shunt values can be represented by 2 different encoded values such as
* 11 or 100 both present 10 milliOhms
* Because it is difficult to make a range check on such encoded value, none is performed
*
* Return 0 if configuration failed
* Return 1 if chip identified as INA219
* Return 2 if chip identified as ISL28022
\*********************************************************************************************/
uint8_t Ina219SetCalibration(uint8_t mode, uint16_t addr)
{
uint16_t config = 0;
DEBUG_SENSOR_LOG("Ina219SetCalibration: mode=%d",mode);
if (mode < 5)
{
// All legacy modes 0..2 are handled the same and consider default 0.1 shunt resistor
Ina219Data->current_multiplier = 1.0 / INA219_DEFAULT_SHUNT_RESISTOR_MILLIOHMS;
#ifdef DEBUG_TASMOTA_SENSOR
dtostrfd(Ina219Data->current_multiplier,5,__ina219_dbg1);
DEBUG_SENSOR_LOG("Ina219SetCalibration: cur_mul=%s",__ina219_dbg1);
#endif
}
else if (mode >= 10)
{
int mult = mode % 10;
int shunt_milliOhms = mode / 10;
for ( ; mult > 0 ; mult-- )
shunt_milliOhms *= 10;
Ina219Data->current_multiplier = 1.0 / shunt_milliOhms;
#ifdef DEBUG_TASMOTA_SENSOR
dtostrfd(Ina219Data->current_multiplier,5,__ina219_dbg1);
DEBUG_SENSOR_LOG("Ina219SetCalibration: shunt=%dmO => cur_mul=%s",shunt_milliOhms,__ina219_dbg1);
#endif
}
config = ISL28022_CONFIG_BVOLTAGERANGE_60V // If INA219 0..32V, If ISL28022 0..60V
| INA219_CONFIG_GAIN_8_320MV // Use max scale
| INA219_CONFIG_BADCRES_12BIT_16S_8510US // use averaging to improve accuracy
| INA219_CONFIG_SADCRES_12BIT_16S_8510US // use averaging to improve accuracy
| INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS;
#ifdef DEBUG_TASMOTA_SENSOR
AddLog(LOG_LEVEL_DEBUG, PSTR("Ina219SetCalibration: Config=0x%04X (%d)"), config, config);
#endif
// Set Config register to take into account the settings above
if (!I2cWrite16(addr, INA219_REG_CONFIG, config))
return 0;
uint16_t intr_reg = 0x0FFFF;
bool status = I2cValidRead16(&intr_reg, addr, ISL28022_REG_INTRSTATUS);
#ifdef DEBUG_TASMOTA_SENSOR
AddLog(LOG_LEVEL_DEBUG, PSTR("Ina219: IntrReg=0x%04X (%d)"), intr_reg, status);
#endif
if (status && 0 == intr_reg)
return ISL28022_ACTIVE; // ISL28022
return INA219_ACTIVE; // INA219
}
float Ina219GetShuntVoltage_mV(uint16_t addr)
{
// raw shunt voltage (16-bit signed integer, so +-32767)
int16_t shunt_voltage = I2cReadS16(addr, INA219_REG_SHUNTVOLTAGE);
DEBUG_SENSOR_LOG("Ina219GetShuntVoltage_mV: ShReg = 0x%04X (%d)",shunt_voltage, shunt_voltage);
// convert to shunt voltage in mV (so +-327mV) (LSB=10µV=0.01mV)
return (float)shunt_voltage * 0.01;
}
float Ina219GetBusVoltage_V(uint16_t addr, uint8_t model)
{
uint16_t bus_voltage = I2cRead16(addr, INA219_REG_BUSVOLTAGE);
if (ISL28022_ACTIVE == model) {
// ISL2802 LSB is bit 2
bus_voltage >>= 2;
DEBUG_SENSOR_LOG("Isl28022GetBusVoltage_V: BusReg = 0x%04X (%d)",bus_voltage, bus_voltage);
}
else {
// INA219 LSB is bit 3
bus_voltage >>= 3;
DEBUG_SENSOR_LOG("Ina219GetBusVoltage_V: BusReg = 0x%04X (%d)",bus_voltage, bus_voltage);
}
// and multiply by LSB raw bus voltage to return bus voltage in volts (LSB=4mV=0.004V)
return (float)bus_voltage * 0.004;
}
bool Ina219Read(void)
{
for (int i=0; ichan[i].active) { continue; }
uint16_t addr = INA219_ADDRESSES[i];
float bus_voltage_V = Ina219GetBusVoltage_V(addr, Ina219Data->chan[i].active);
float shunt_voltage_mV = Ina219GetShuntVoltage_mV(addr);
#ifdef DEBUG_TASMOTA_SENSOR
dtostrfd(bus_voltage_V,5,__ina219_dbg1);
dtostrfd(shunt_voltage_mV,5,__ina219_dbg2);
DEBUG_SENSOR_LOG("Ina219Read: bV=%sV, sV=%smV",__ina219_dbg1,__ina219_dbg2);
#endif
// we return the power-supply-side voltage (as bus_voltage register provides the load-side voltage)
Ina219Data->chan[i].voltage = bus_voltage_V + (shunt_voltage_mV / 1000);
// current is simply calculted from shunt voltage using pre-calculated multiplier
Ina219Data->chan[i].current = shunt_voltage_mV * Ina219Data->current_multiplier;
#ifdef DEBUG_TASMOTA_SENSOR
dtostrfd(Ina219Data->chan[i].voltage,5,__ina219_dbg1);
dtostrfd(Ina219Data->chan[i].current,5,__ina219_dbg2);
DEBUG_SENSOR_LOG("Ina219Read: V=%sV, I=%smA",__ina219_dbg1,__ina219_dbg2);
#endif
Ina219Data->chan[i].valid = SENSOR_MAX_MISS;
}
return true;
}
/*********************************************************************************************\
* Command Sensor13
\*********************************************************************************************/
bool Ina219CommandSensor(void)
{
if ((XdrvMailbox.payload >= 0) && (XdrvMailbox.payload <= 255)) {
Settings->ina219_mode = XdrvMailbox.payload;
TasmotaGlobal.restart_flag = 2;
}
Response_P(S_JSON_SENSOR_INDEX_NVALUE, XSNS_13, Settings->ina219_mode);
return true;
}
/********************************************************************************************/
void Ina219Detect(void)
{
for (uint32_t i = 0; i < INA219_MAX_COUNT; i++) {
uint16_t addr = INA219_ADDRESSES[i];
if (!I2cSetDevice(addr)) { continue; }
if (!Ina219Data) {
Ina219Data = (struct INA219_Data*)calloc(1,sizeof(struct INA219_Data));
if (!Ina219Data) {
AddLog(LOG_LEVEL_ERROR,PSTR("INA219: Mem Error"));
return;
}
}
int model = Ina219SetCalibration(Settings->ina219_mode, addr);
if (model) {
I2cSetActiveFound(addr, INA219_TYPE[model-1]);
Ina219Data->chan[i].active = model;
Ina219Data->count++;
}
}
}
void Ina219EverySecond(void)
{
// 4 x 3mS
Ina219Read();
}
#ifdef USE_WEBSERVER
const char HTTP_SNS_INA219_DATA[] PROGMEM =
"{s}%s " D_VOLTAGE "{m}%s " D_UNIT_VOLT "{e}"
"{s}%s " D_CURRENT "{m}%s " D_UNIT_AMPERE "{e}"
"{s}%s " D_POWERUSAGE "{m}%s " D_UNIT_WATT "{e}";
#endif // USE_WEBSERVER
void Ina219Show(bool json)
{
int num_found=0;
for (int i=0; ichan[i].active && Ina219Data->chan[i].valid)
num_found++;
int sensor_num = 0;
for (int i=0; ichan[i].active && !Ina219Data->chan[i].valid)
continue;
sensor_num++;
char voltage[16];
dtostrfd(Ina219Data->chan[i].voltage, Settings->flag2.voltage_resolution, voltage);
char current[16];
dtostrfd(Ina219Data->chan[i].current, Settings->flag2.current_resolution, current);
char power[16];
dtostrfd(Ina219Data->chan[i].voltage * Ina219Data->chan[i].current, Settings->flag2.wattage_resolution, power);
char name[16];
if (num_found>1)
snprintf_P(name, sizeof(name), PSTR("%s%c%d"), INA219_TYPE[Ina219Data->chan[i].active-1], IndexSeparator(), sensor_num);
else
snprintf_P(name, sizeof(name), PSTR("%s"), INA219_TYPE[Ina219Data->chan[i].active-1]);
if (json) {
ResponseAppend_P(PSTR(",\"%s\":{\"Id\":%02x,\"" D_JSON_VOLTAGE "\":%s,\"" D_JSON_CURRENT "\":%s,\"" D_JSON_POWERUSAGE "\":%s}"),
name, INA219_ADDRESSES[i], voltage, current, power);
#ifdef USE_DOMOTICZ
if (0 == TasmotaGlobal.tele_period) {
DomoticzSensor(DZ_VOLTAGE, voltage);
DomoticzSensor(DZ_CURRENT, current);
}
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
WSContentSend_PD(HTTP_SNS_INA219_DATA, name, voltage, name, current, name, power);
#endif // USE_WEBSERVER
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns13(uint8_t function)
{
if (!I2cEnabled(XI2C_14)) { return false; }
bool result = false;
if (FUNC_INIT == function) {
Ina219Detect();
}
else if (Ina219Data) {
switch (function) {
case FUNC_COMMAND_SENSOR:
if (XSNS_13 == XdrvMailbox.index) {
result = Ina219CommandSensor();
}
break;
case FUNC_EVERY_SECOND:
Ina219EverySecond();
break;
case FUNC_JSON_APPEND:
Ina219Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
Ina219Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_INA219
#endif // USE_I2C