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