Tasmota/tasmota/xsns_54_ina226.ino

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2019-09-05 16:20:40 +01:00
/*
xsns_54_ina226.ino - INA226 Current Sensor support for Tasmota
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Copyright (C) 2021 Stephen Rodgers and Theo Arends
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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.
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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.
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You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_I2C
#ifdef USE_INA226
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/*
* Setup a single INA226 device at address 0x40:
*
* 1. Select a module type with free I2C pins.
* 2. Configure the module to use I2C on the correct pins.
* 3. Connect your ina226 module(s) to the I2C pins.
* 4. Use the i2cscan console command to probe the modules and check they are present.
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* 5. Enable the first device at I2C address 0x40 using the following console commands:
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* a. Sensor54 11 [shunt resistance in ohms] e.g. Sensor54 11 0.1
* b. Sensor54 12 [full scale current in amperes] e.g. Sensor54 12 3.0
* c. Sensor54 2 saves the settings and restarts Tasmota. The device should show up after the system boots again.
*
*
* This driver will not probe I2C bus for INA226 devices unless the full scale current is set for a device number.
* It will map device numbers as follows:
*
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* Device number to I2C address mapping
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*
* 1 - 0x40
* 2 - 0x41
* 3 - 0x44
* 4 - 0x45
*
* To set shunt resistance and full scale current, use the Sensor54 command interface as follows:
*
* Sensor54 10 Return channel 1 shunt resistance and full scale current
* Sensor54 11 [shunt_resistance] Set INA226 channel 1 shunt resistance in ohms, floating point
* Sensor54 12 [full_scale_current] Set INA226 channel 1 full scale current in amperes, floating point
* Sensor54 20 Return channel 2 shunt resistance and full scale current
* Sensor54 21 [shunt_resistance] Set INA226 channel 2 shunt resistance in ohms, floating point
* Sensor54 22 [full_scale_current] Set INA226 channel 2 full scale current in amperes, floating point
* Sensor54 30 Return channel 3 shunt resistance and full scale current
* Sensor54 31 [shunt_resistance] Set INA226 channel 3 shunt resistance in ohms, floating point
* Sensor54 32 [full_scale_current] Set INA226 channel 3 full scale current in amperes, floating point
* Sensor54 40 Return channel 4 shunt resistance and full scale current
* Sensor54 41 [shunt_resistance] Set INA226 channel 4 shunt resistance in ohms, floating point
* Sensor54 42 [full_scale_current] Set INA226 channel 4 full scale current in amperes, floating point
*
* Other commands
*
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* Sensor54 1 Rescan for devices and return the number of INA226 found.
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* Sensor54 2 Save the configuration and restart
*
*
*/
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// Define driver ID
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#define XSNS_54 54
#define XI2C_35 35 // See I2CDEVICES.md
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#define INA226_MAX_ADDRESSES 4
#define INA226_ADDRESS1 (0x40) // 1000000 (A0+A1=GND)
#define INA226_ADDRESS2 (0x41) // 1000000 (A0=Vcc, A1=GND)
#define INA226_ADDRESS3 (0x44) // 1000000 (A0=GND, A1=Vcc)
#define INA226_ADDRESS4 (0x45) // 1000000 (A0+A1=Vcc)
#define INA226_REG_CONFIG (0x00) // Config register
#define INA226_RES_CONFIG (0x4127) // Config register at reset
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#define INA226_DEF_CONFIG (0x42FF) // Our default configuration
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#define INA226_CONFIG_RESET (0x8000) // Config register reset bit
#define INA226_REG_SHUNTVOLTAGE (0x01)
#define INA226_REG_BUSVOLTAGE (0x02)
#define INA226_REG_POWER (0x03)
#define INA226_REG_CURRENT (0x04)
#define INA226_REG_CALIBRATION (0x05)
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typedef struct Ina226Info_tag {
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uint8_t address;
uint16_t calibrationValue;
uint16_t config;
uint8_t present : 1;
float i_lsb;
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} Ina226Info_t;
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/*
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* Program memory constants
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*/
static const uint8_t PROGMEM probeAddresses[INA226_MAX_ADDRESSES] = {INA226_ADDRESS1, INA226_ADDRESS2, INA226_ADDRESS3, INA226_ADDRESS4};
/*
* Global Variables
*/
static char Ina226Str[] = "INA226";
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static uint8_t Ina226sFound = 0;
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static uint8_t schedule_reinit = 0;
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static Ina226Info_t Ina226Info[4] = {0};
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//static uint16_t reinit_count[4];
static float voltages[4];
static float currents[4];
static float powers[4];
/*
* Log single floating point Number
*/
static void _debug_fval(const char *str, float fval, uint8_t prec = 4 )
{
char fstr[32];
dtostrfd(fval, prec, fstr);
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AddLog( LOG_LEVEL_DEBUG, PSTR("%s: %s"), str, fstr );
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}
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/*
* Convert 16 bit repesentation of shunt resisance to 32 bit micro ohms by looking at the msb range bit.
* If the msb is 1, the LSB's define the number of milli ohms. (Maximum shunt resistor value 32.767 ohms)
* If the msb is 0, the LSB's define the number of micro ohms. (Maximum shunt resistor value 0.032767 ohms)
*/
static uint32_t _expand_r_shunt(uint16_t compact_r_shunt)
{
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uint32_t r_shunt_uohms = (compact_r_shunt & 0x8000) ?
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(((uint32_t)(compact_r_shunt & 0x7FFF)) * 1000ul) :
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(compact_r_shunt & 0x7FFF);
return r_shunt_uohms;
}
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/*
* Set calibration value for Ina226
*/
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void Ina226SetCalibration(uint8_t Ina226Index)
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{
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Ina226Info_t *si = Ina226Info + Ina226Index;
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I2cWrite16( si->address, INA226_REG_CALIBRATION, si->calibrationValue);
}
/*
* Test for presence of an Ina226
*/
bool Ina226TestPresence(uint8_t device)
{
// Read config
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uint16_t config = I2cRead16( Ina226Info[device].address, INA226_REG_CONFIG );
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//AddLog( LOG_LEVEL_NONE, PSTR("Config register %04x" ), config);
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if (config != Ina226Info[device].config)
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return false;
return true;
}
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void Ina226ResetActive(void)
{
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Ina226Info_t *p = Ina226Info;
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for (uint32_t i = 0; i < INA226_MAX_ADDRESSES; i++) {
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p = &Ina226Info[i];
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// Address
uint8_t addr = p->address;
if (addr) {
I2cResetActive(addr);
}
}
}
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/*
* Initialize INA226 devices
*/
void Ina226Init()
{
uint32_t i;
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Ina226sFound = 0;
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Ina226Info_t *p = Ina226Info;
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//AddLog( LOG_LEVEL_NONE, "Ina226Init");
// AddLog( LOG_LEVEL_NONE, "Size of Settings: %d bytes", sizeof(Settings));
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// if (!TasmotaGlobal.i2c_enabled)
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// AddLog(LOG_LEVEL_DEBUG, "INA226: Initialization failed: No I2C support");
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// Clear Ina226 info data
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for (i = 0; i < 4; i++){
*p = {0};
}
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//AddLog( LOG_LEVEL_NONE, PSTR("Sizeof Ina226Cfg: %d" ), sizeof(Ina226Cfg));
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// Detect devices
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for (i = 0; i < INA226_MAX_ADDRESSES; i++){
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uint8_t addr = pgm_read_byte(probeAddresses + i);
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if (I2cActive(addr)) { continue; }
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// Skip device probing if the full scale current is zero
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//AddLog( LOG_LEVEL_NONE, "fs_i[%d]: %d", i, Settings.ina226_i_fs[i]);
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if (!Settings.ina226_i_fs[i])
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continue;
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//AddLog( LOG_LEVEL_NONE, PSTR("INA226 trying address %02x" ), addr );
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// Try Resetting the device
if (!I2cWrite16( addr, INA226_REG_CONFIG, INA226_CONFIG_RESET)){
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AddLog( LOG_LEVEL_DEBUG, "No INA226 at address: %02X", addr);
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continue; // No device
}
// Read config
uint16_t config = I2cRead16( addr, INA226_REG_CONFIG );
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//AddLog( LOG_LEVEL_NONE, PSTR("INA226 Config register %04x" ), config);
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if (INA226_RES_CONFIG != config)
continue;
config = INA226_DEF_CONFIG; // Fixme
// Set the default configuration
if (!I2cWrite16( addr, INA226_REG_CONFIG, config))
continue; // No device
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// store data in info struct.
p = &Ina226Info[i];
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// Address
p->address = addr;
// Configuration
p->config = config;
// Full scale current in tenths of an amp
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//AddLog( LOG_LEVEL_NONE, "Full Scale I in tenths of an amp: %u", Settings.ina226_i_fs[i]);
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p->i_lsb = (((float) Settings.ina226_i_fs[i])/10.0f)/32768.0f;
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//_debug_fval("i_lsb: %s", p->i_lsb, 7);
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// Get shunt resistor value in micro ohms
uint32_t r_shunt_uohms = _expand_r_shunt(Settings.ina226_r_shunt[i]);
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//AddLog( LOG_LEVEL_NONE, "Shunt R in micro-ohms: %u", r_shunt_uohms);
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p->calibrationValue = ((uint16_t) (0.00512/(p->i_lsb * r_shunt_uohms/1000000.0f)));
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// Device present
p->present = true;
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//AddLog( LOG_LEVEL_NONE, "INA226 Device %d calibration value: %04X", i, p->calibrationValue);
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Ina226SetCalibration(i);
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I2cSetActiveFound(addr, Ina226Str);
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Ina226sFound++;
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}
}
/*
* Read the bus voltage, and return it as a float
*/
float Ina226ReadBus_v(uint8_t device)
{
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uint8_t addr = Ina226Info[device].address;
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int16_t reg_bus_v = I2cReadS16( addr, INA226_REG_BUSVOLTAGE);
float result = ((float) reg_bus_v) * 0.00125f;
return result;
}
/*
* Read the shunt current, and return it as a float
*/
float Ina226ReadShunt_i(uint8_t device)
{
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uint8_t addr = Ina226Info[device].address;
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int16_t reg_shunt_i = I2cReadS16( addr, INA226_REG_CURRENT);
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float result = ((float) reg_shunt_i) * Ina226Info[device].i_lsb;
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return result;
}
/*
* Read the calculated power
*/
float Ina226ReadPower_w(uint8_t device)
{
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uint8_t addr = Ina226Info[device].address;
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int16_t reg_shunt_i = I2cReadS16( addr, INA226_REG_POWER);
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float result = ((float) reg_shunt_i) * (Ina226Info[device].i_lsb * 25.0);
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return result;
}
/*
* Read voltage, shunt voltage, current, and power registerd for a given device
*/
void Ina226Read(uint8_t device)
{
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//AddLog( LOG_LEVEL_NONE, "Ina226Read");
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voltages[device] = Ina226ReadBus_v(device);
currents[device] = Ina226ReadShunt_i(device);
powers[device] = Ina226ReadPower_w(device);
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//AddLog( LOG_LEVEL_NONE, "INA226 Device %d", device );
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//_debug_fval("Voltage", voltages[device]);
//_debug_fval("Current", currents[device]);
//_debug_fval("Power", powers[device]);
}
/*
* Poll sensors, and chack for sensor presence
*/
void Ina226EverySecond()
{
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//AddLog( LOG_LEVEL_NONE, "Ina226EverySecond");
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for (uint8_t device = 0; device < INA226_MAX_ADDRESSES; device++){
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// If there are Ina226s, and the device was present, and the device still is present, read its registers
if (Ina226sFound && Ina226Info[device].present && Ina226TestPresence(device)){
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Ina226Read(device);
}
else {
powers[device] = currents[device] = voltages[device] = 0.0f;
// If device was present, note that it dropped off here
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//if(Ina226Info[device].present){
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//reinit_count[device]++;
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//AddLog( LOG_LEVEL_DEBUG, "INA226 Device %d dropped off, count: %d", device, reinit_count[device]);
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//}
// Device no longer present
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Ina226Info[device].present = false;
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}
}
}
/*
* Decode a sensor command and act on it
*/
bool Ina226CommandSensor()
{
bool serviced = true;
bool show_config = false;
char param_str[64];
char *cp, *params[4];
uint8_t i, param_count, device, p1 = XdrvMailbox.payload;
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uint32_t r_shunt_uohms;
uint16_t compact_r_shunt_uohms;
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//AddLog( LOG_LEVEL_NONE, "Command received: %d", XdrvMailbox.payload);
//AddLog( LOG_LEVEL_NONE, "Command data received: %s", XdrvMailbox.data);
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// Make a copy of the data and add another terminator
if (XdrvMailbox.data_len > 62){
return false;
}
strncpy(param_str, XdrvMailbox.data, XdrvMailbox.data_len + 1);
param_str[XdrvMailbox.data_len] = 0;
// Build parameter substrings (this should really be a helper function in support_command.ino)
for (cp = param_str, i = 0, param_count = 0; *cp && (i < XdrvMailbox.data_len + 1) && (param_count <= 3); i++)
if (param_str[i] == ' ' || param_str[i] == ',' || param_str[i] == 0){
param_str[i] = 0;
params[param_count] = cp;
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//AddLog( LOG_LEVEL_NONE, "INA226 Command parameter: %d, value: %s", param_count, params[param_count]);
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param_count++;
cp = param_str + i + 1;
}
if (p1 < 10 || p1 >= 50){
// Device-less commands
switch (p1){
case 1: // Rerun init
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Ina226ResetActive();
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Ina226Init();
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Response_P(PSTR("{\"Sensor54-Command-Result\":{\"Ina226sFound\":%d}}"),Ina226sFound);
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break;
case 2: // Save and restart
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TasmotaGlobal.restart_flag = 2;
Response_P(PSTR("{\"Sensor54-Command-Result\":{\"Restart_flag\":%d}}"),TasmotaGlobal.restart_flag);
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break;
default:
serviced = false;
}
}
else if (p1 < 50){
// Commands 10-49 tied to a particular device
device = (p1 / 10) - 1; // Leading Tens digit is device number {1-4}
switch (p1 % 10){
case 0: // Show config
show_config = true;
break;
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case 1: // Set compacted shunt resistance from user input in ohms
r_shunt_uohms = (uint32_t) ((CharToFloat(params[1])) * 1000000.0f);
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//AddLog( LOG_LEVEL_NONE, "r_shunt_uohms: %d", r_shunt_uohms);
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if (r_shunt_uohms > 32767){
uint32_t r_shunt_mohms = r_shunt_uohms/1000UL;
Settings.ina226_r_shunt[device] = (uint16_t) (r_shunt_mohms | 0x8000);
}
else
Settings.ina226_r_shunt[device] = (uint16_t) r_shunt_uohms;
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//AddLog( LOG_LEVEL_NONE, "r_shunt_compacted: %04X", Settings.ina226_r_shunt[device]);
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show_config = true;
break;
case 2: // Set full scale current in tenths of amps from user input in Amps
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Settings.ina226_i_fs[device] = (uint16_t) ((CharToFloat(params[1])) * 10.0f);
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//AddLog( LOG_LEVEL_NONE, "i_fs: %d", Settings.ina226_i_fs[device]);
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show_config = true;
break;
default:
serviced = false;
break;
}
}
else
serviced = false;
if (show_config) {
char shunt_r_str[16];
char fs_i_str[16];
// Shunt resistance is stored in EEPROM in microohms. Convert to ohms
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r_shunt_uohms = _expand_r_shunt(Settings.ina226_r_shunt[device]);
dtostrfd(((float)r_shunt_uohms)/1000000.0f, 6, shunt_r_str);
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// Full scale current is stored in EEPROM in tenths of an amp. Convert to amps.
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dtostrfd(((float)Settings.ina226_i_fs[device])/10.0f, 1, fs_i_str);
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// Send json response
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Response_P(PSTR("{\"Sensor54-device-settings-%d\":{\"SHUNT_R\":%s,\"FS_I\":%s}}"),
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device + 1, shunt_r_str, fs_i_str);
}
return serviced;
}
/*
* Show data gathered from INA226 devices
*/
#ifdef USE_WEBSERVER
const char HTTP_SNS_INA226_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 Ina226Show(bool json)
{
int i, num_found;
for (num_found = 0, i = 0; i < INA226_MAX_ADDRESSES; i++) {
// Skip uninstalled sensors
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if (!Ina226Info[i].present)
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continue;
num_found++;
char voltage[16];
dtostrfd(voltages[i], Settings.flag2.voltage_resolution, voltage);
char current[16];
dtostrfd(currents[i], Settings.flag2.current_resolution, current);
char power[16];
dtostrfd(powers[i], Settings.flag2.wattage_resolution, power);
char name[16];
snprintf_P(name, sizeof(name), PSTR("INA226%c%d"),IndexSeparator(), i + 1);
if (json) {
ResponseAppend_P(PSTR(",\"%s\":{\"Id\":%d,\"" D_JSON_VOLTAGE "\":%s,\"" D_JSON_CURRENT "\":%s,\"" D_JSON_POWERUSAGE "\":%s}"),
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name, i, voltage, current, power);
#ifdef USE_DOMOTICZ
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if (0 == TasmotaGlobal.tele_period) {
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DomoticzSensor(DZ_VOLTAGE, voltage);
DomoticzSensor(DZ_CURRENT, current);
}
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
WSContentSend_PD(HTTP_SNS_INA226_DATA, name, voltage, name, current, name, power);
#endif // USE_WEBSERVER)
}
}
}
/**
* The callback function Xsns_57() interfaces Tasmota with the sensor driver.
*
* It provides the Tasmota callback IDs.
*
* @param byte callback_id Tasmota function ID.
* @return bool Return value.
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* @pre None.
* @post None.
*
*/
bool Xsns54(byte callback_id)
{
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if (!I2cEnabled(XI2C_35)) { return false; }
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// Set return value to `false`
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bool result = false;
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// Check which callback ID is called by Tasmota
switch (callback_id) {
case FUNC_EVERY_SECOND:
Ina226EverySecond();
break;
case FUNC_JSON_APPEND:
Ina226Show(1);
break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
Ina226Show(0);
break;
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#endif // USE_WEBSERVER
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case FUNC_COMMAND_SENSOR:
if (XSNS_54 == XdrvMailbox.index) {
result = Ina226CommandSensor();
}
break;
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case FUNC_INIT:
Ina226Init();
break;
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}
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// Return boolean result
return result;
}
#endif // USE_INA226
#endif // USE_I2C