Fork of the espurna firmware for `mhsw` switches
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// -----------------------------------------------------------------------------
// ADS121-based Energy Monitor Sensor over I2C
// Copyright (C) 2017 by Xose Pérez <xose dot perez at gmail dot com>
// -----------------------------------------------------------------------------
#pragma once
#include "Arduino.h"
#include "EmonAnalogSensor.h"
#if I2C_USE_BRZO
#include <brzo_i2c.h>
#else
#include <Wire.h>
#endif
// ADC121 Registers
#define ADC121_REG_RESULT 0x00
#define ADC121_REG_ALERT 0x01
#define ADC121_REG_CONFIG 0x02
#define ADC121_REG_LIMITL 0x03
#define ADC121_REG_LIMITH 0x04
#define ADC121_REG_HYST 0x05
#define ADC121_REG_CONVL 0x06
#define ADC121_REG_CONVH 0x07
#define ADC121_RESOLUTION 12
#define ADC121_CHANNELS 1
class EmonADC121Sensor : public EmonAnalogSensor {
public:
// ---------------------------------------------------------------------
// Public
// ---------------------------------------------------------------------
EmonADC121Sensor(): EmonAnalogSensor() {
_channels = ADC121_CHANNELS;
_sensor_id = SENSOR_EMON_ADC121_ID;
init();
}
// ---------------------------------------------------------------------
// Sensor API
// ---------------------------------------------------------------------
// Initialization method, must be idempotent
void begin() {
if (!_dirty) return;
_dirty = false;
// Discover
unsigned char addresses[] = {0x50, 0x51, 0x52, 0x54, 0x55, 0x56, 0x58, 0x59, 0x5A};
_address = _begin_i2c(_address, sizeof(addresses), addresses);
if (_address == 0) return;
// Init sensor
#if I2C_USE_BRZO
uint8_t buffer[2];
buffer[0] = ADC121_REG_CONFIG;
buffer[1] = 0x00;
brzo_i2c_start_transaction(_address, I2C_SCL_FREQUENCY);
brzo_i2c_write(buffer, 2, false);
brzo_i2c_end_transaction();
#else
Wire.beginTransmission(_address);
Wire.write(ADC121_REG_CONFIG);
Wire.write(0x00);
Wire.endTransmission();
#endif
// Just one channel
_count = _magnitudes;
// Bit depth
_resolution = ADC121_RESOLUTION;
// Call the parent class method
EmonSensor::begin();
// warmup channel 0 (the only one)
read(0);
}
// Descriptive name of the sensor
String description() {
char buffer[30];
snprintf(buffer, sizeof(buffer), "EMON @ ADC121 @ I2C (0x%02X)", _address);
return String(buffer);
}
// Pre-read hook (usually to populate registers with up-to-date data)
void pre() {
if (_address == 0) {
_error = SENSOR_ERROR_UNKNOWN_ID;
return;
}
EmonAnalogSensor:pre();
}
protected:
// ---------------------------------------------------------------------
// Protected
// ---------------------------------------------------------------------
unsigned int readADC(unsigned char channel) {
(void) channel;
unsigned int value;
#if I2C_USE_BRZO
uint8_t buffer[2];
buffer[0] = ADC121_REG_RESULT;
brzo_i2c_start_transaction(_address, I2C_SCL_FREQUENCY);
brzo_i2c_write(buffer, 1, false);
brzo_i2c_read(buffer, 2, false);
brzo_i2c_end_transaction();
value = (buffer[0] & 0x0F) << 8;
value |= buffer[1];
#else
Wire.beginTransmission(_address);
Wire.write(ADC121_REG_RESULT);
Wire.endTransmission();
Wire.requestFrom(_address, (unsigned char) 2);
value = (Wire.read() & 0x0F) << 8;
value = value + Wire.read();
#endif
return value;
}
};