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406 lines
15 KiB
406 lines
15 KiB
// -----------------------------------------------------------------------------
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// ADS1X15-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 "BaseSensor.h"
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#include "EmonSensor.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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#define ADS1X15_CHANNELS (4)
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#define ADS1X15_CHIP_ADS1015 (0)
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#define ADS1X15_CHIP_ADS1115 (1)
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#define ADS1X15_RESOLUTION (16)
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#define ADS1015_CONVERSIONDELAY (1)
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#define ADS1115_CONVERSIONDELAY (8)
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#define ADS1015_BIT_SHIFT (4)
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#define ADS1115_BIT_SHIFT (0)
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#define ADS1X15_REG_POINTER_MASK (0x03)
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#define ADS1X15_REG_POINTER_CONVERT (0x00)
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#define ADS1X15_REG_POINTER_CONFIG (0x01)
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#define ADS1X15_REG_POINTER_LOWTHRESH (0x02)
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#define ADS1X15_REG_POINTER_HITHRESH (0x03)
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#define ADS1X15_REG_CONFIG_OS_MASK (0x8000)
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#define ADS1X15_REG_CONFIG_OS_SINGLE (0x8000) // Write: Set to start a single-conversion
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#define ADS1X15_REG_CONFIG_OS_BUSY (0x0000) // Read: Bit = 0 when conversion is in progress
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#define ADS1X15_REG_CONFIG_OS_NOTBUSY (0x8000) // Read: Bit = 1 when device is not performing a conversion
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#define ADS1X15_REG_CONFIG_MUX_MASK (0x7000)
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#define ADS1X15_REG_CONFIG_MUX_DIFF_0_1 (0x0000) // Differential P = AIN0, N = AIN1 (default)
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#define ADS1X15_REG_CONFIG_MUX_DIFF_0_3 (0x1000) // Differential P = AIN0, N = AIN3
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#define ADS1X15_REG_CONFIG_MUX_DIFF_1_3 (0x2000) // Differential P = AIN1, N = AIN3
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#define ADS1X15_REG_CONFIG_MUX_DIFF_2_3 (0x3000) // Differential P = AIN2, N = AIN3
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#define ADS1X15_REG_CONFIG_MUX_SINGLE_0 (0x4000) // Single-ended AIN0
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#define ADS1X15_REG_CONFIG_MUX_SINGLE_1 (0x5000) // Single-ended AIN1
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#define ADS1X15_REG_CONFIG_MUX_SINGLE_2 (0x6000) // Single-ended AIN2
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#define ADS1X15_REG_CONFIG_MUX_SINGLE_3 (0x7000) // Single-ended AIN3
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#define ADS1X15_REG_CONFIG_PGA_MASK (0x0E00)
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#define ADS1X15_REG_CONFIG_PGA_6_144V (0x0000) // +/-6.144V range = Gain 2/3
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#define ADS1X15_REG_CONFIG_PGA_4_096V (0x0200) // +/-4.096V range = Gain 1
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#define ADS1X15_REG_CONFIG_PGA_2_048V (0x0400) // +/-2.048V range = Gain 2 (default)
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#define ADS1X15_REG_CONFIG_PGA_1_024V (0x0600) // +/-1.024V range = Gain 4
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#define ADS1X15_REG_CONFIG_PGA_0_512V (0x0800) // +/-0.512V range = Gain 8
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#define ADS1X15_REG_CONFIG_PGA_0_256V (0x0A00) // +/-0.256V range = Gain 16
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#define ADS1X15_REG_CONFIG_MODE_MASK (0x0100)
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#define ADS1X15_REG_CONFIG_MODE_CONTIN (0x0000) // Continuous conversion mode
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#define ADS1X15_REG_CONFIG_MODE_SINGLE (0x0100) // Power-down single-shot mode (default)
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#define ADS1X15_REG_CONFIG_DR_MASK (0x00E0)
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#define ADS1015_REG_CONFIG_DR_128SPS (0x0000) // 128 samples per second
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#define ADS1015_REG_CONFIG_DR_250SPS (0x0020) // 250 samples per second
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#define ADS1015_REG_CONFIG_DR_490SPS (0x0040) // 490 samples per second
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#define ADS1015_REG_CONFIG_DR_920SPS (0x0060) // 920 samples per second
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#define ADS1015_REG_CONFIG_DR_1600SPS (0x0080) // 1600 samples per second (default)
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#define ADS1015_REG_CONFIG_DR_2400SPS (0x00A0) // 2400 samples per second
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#define ADS1015_REG_CONFIG_DR_3300SPS (0x00C0) // 3300 samples per second
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#define ADS1115_REG_CONFIG_DR_8SPS (0x0000) // 8 samples per second
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#define ADS1115_REG_CONFIG_DR_16SPS (0x0020) // 16 samples per second
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#define ADS1115_REG_CONFIG_DR_32SPS (0x0040) // 32 samples per second
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#define ADS1115_REG_CONFIG_DR_64SPS (0x0060) // 64 samples per second
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#define ADS1115_REG_CONFIG_DR_128SPS (0x0080) // 128 samples per second (default)
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#define ADS1115_REG_CONFIG_DR_250SPS (0x00A0) // 250 samples per second
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#define ADS1115_REG_CONFIG_DR_475SPS (0x00C0) // 475 samples per second
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#define ADS1115_REG_CONFIG_DR_860SPS (0x00E0) // 860 samples per second
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#define ADS1X15_REG_CONFIG_CMODE_MASK (0x0010)
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#define ADS1X15_REG_CONFIG_CMODE_TRAD (0x0000) // Traditional comparator with hysteresis (default)
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#define ADS1X15_REG_CONFIG_CMODE_WINDOW (0x0010) // Window comparator
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#define ADS1X15_REG_CONFIG_CPOL_MASK (0x0008)
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#define ADS1X15_REG_CONFIG_CPOL_ACTVLOW (0x0000) // ALERT/RDY pin is low when active (default)
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#define ADS1X15_REG_CONFIG_CPOL_ACTVHI (0x0008) // ALERT/RDY pin is high when active
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#define ADS1X15_REG_CONFIG_CLAT_MASK (0x0004) // Determines if ALERT/RDY pin latches once asserted
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#define ADS1X15_REG_CONFIG_CLAT_NONLAT (0x0000) // Non-latching comparator (default)
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#define ADS1X15_REG_CONFIG_CLAT_LATCH (0x0004) // Latching comparator
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#define ADS1X15_REG_CONFIG_CQUE_MASK (0x0003)
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#define ADS1X15_REG_CONFIG_CQUE_1CONV (0x0000) // Assert ALERT/RDY after one conversions
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#define ADS1X15_REG_CONFIG_CQUE_2CONV (0x0001) // Assert ALERT/RDY after two conversions
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#define ADS1X15_REG_CONFIG_CQUE_4CONV (0x0002) // Assert ALERT/RDY after four conversions
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#define ADS1X15_REG_CONFIG_CQUE_NONE (0x0003) // Disable the comparator and put ALERT/RDY in high state (default)
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class EmonADS1X15Sensor : public EmonSensor {
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public:
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// ---------------------------------------------------------------------
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// Public
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// ---------------------------------------------------------------------
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EmonADS1X15Sensor(): EmonSensor() {
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_channels = ADS1X15_CHANNELS;
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init();
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}
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// ---------------------------------------------------------------------
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void setAddress(unsigned char address) {
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if (_address == address) return;
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_address = address;
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_dirty = true;
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}
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void setType(unsigned char type) {
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if (_type == type) return;
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_type = type;
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_dirty = true;
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}
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void setMask(unsigned char mask) {
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if (_mask == mask) return;
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_mask = mask;
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_dirty = true;
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}
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void setGain(unsigned int gain) {
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if (_gain == gain) return;
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_gain = gain;
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_dirty = true;
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}
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// ---------------------------------------------------------------------
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unsigned char getAddress() {
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return _address;
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}
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unsigned char getType() {
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return _type;
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}
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unsigned char getMask() {
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return _mask;
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}
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unsigned char getGain() {
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return _gain;
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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[] = {0x48, 0x49, 0x4A, 0x4B};
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_address = lock_i2c(_address, sizeof(addresses), addresses);
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if (_address == 0) return;
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// Calculate ports
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_ports = 0;
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unsigned char mask = _mask;
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while (mask) {
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if (mask & 0x01) ++_ports;
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mask = mask >> 1;
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}
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_count = _ports * _magnitudes;
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// Bit depth
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_resolution = ADS1X15_RESOLUTION;
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// Reference based on gain
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if (_gain == ADS1X15_REG_CONFIG_PGA_6_144V) _reference = 12.288;
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if (_gain == ADS1X15_REG_CONFIG_PGA_4_096V) _reference = 8.192;
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if (_gain == ADS1X15_REG_CONFIG_PGA_2_048V) _reference = 4.096;
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if (_gain == ADS1X15_REG_CONFIG_PGA_1_024V) _reference = 2.048;
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if (_gain == ADS1X15_REG_CONFIG_PGA_0_512V) _reference = 1.024;
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if (_gain == ADS1X15_REG_CONFIG_PGA_0_256V) _reference = 0.512;
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// Call the parent class method
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EmonSensor::begin();
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// warmup all channels
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warmup();
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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 @ ADS1%d15 @ I2C (0x%02X)", _type == ADS1X15_CHIP_ADS1015 ? 0 : 1, _address);
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return String(buffer);
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}
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// Descriptive name of the slot # index
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String slot(unsigned char index) {
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char buffer[35];
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unsigned char channel = getChannel(index % _ports);
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snprintf(buffer, sizeof(buffer), "EMON @ ADS1%d15 (A%d) @ I2C (0x%02X)", _type == ADS1X15_CHIP_ADS1015 ? 0 : 1, channel, _address);
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return String(buffer);
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}
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// Type for slot # index
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magnitude_t type(unsigned char index) {
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if (index < _count) {
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_error = SENSOR_ERROR_OK;
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unsigned char magnitude = index / _ports;
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unsigned char i=0;
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#if EMON_REPORT_CURRENT
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if (magnitude == i++) return MAGNITUDE_CURRENT;
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#endif
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#if EMON_REPORT_POWER
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if (magnitude == i++) return MAGNITUDE_POWER_APPARENT;
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#endif
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#if EMON_REPORT_ENERGY
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if (magnitude == i) return MAGNITUDE_ENERGY;
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#endif
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}
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_error = SENSOR_ERROR_OUT_OF_RANGE;
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return MAGNITUDE_NONE;
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}
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void pre() {
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static unsigned long last = 0;
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for (unsigned char port=0; port<_ports; port++) {
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unsigned char channel = getChannel(port);
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_current[port] = getCurrent(channel);
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#if EMON_REPORT_ENERGY
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_energy[port] += (_current[port] * _voltage * (millis() - last) / 1000);
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#endif
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}
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last = millis();
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}
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// Current value for slot # index
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double value(unsigned char index) {
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if (index < _count) {
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_error = SENSOR_ERROR_OK;
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unsigned char port = index % _ports;
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unsigned char magnitude = index / _ports;
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unsigned char i=0;
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#if EMON_REPORT_CURRENT
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if (magnitude == i++) return _current[port];
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#endif
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#if EMON_REPORT_POWER
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if (magnitude == i++) return _current[port] * _voltage;
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#endif
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#if EMON_REPORT_ENERGY
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if (magnitude == i) return _energy[port];
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#endif
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}
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_error = SENSOR_ERROR_OUT_OF_RANGE;
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return 0;
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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 char getChannel(unsigned char port) {
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unsigned char count = 0;
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unsigned char bit = 1;
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for (unsigned char channel=0; channel<ADS1X15_CHANNELS; channel++) {
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if ((_mask & bit) == bit) {
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if (count == port) return channel;
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++count;
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}
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bit <<= 1;
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}
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return 0;
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}
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void warmup() {
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for (unsigned char port=0; port<_ports; port++) {
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unsigned char channel = getChannel(port);
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_pivot[channel] = _adc_counts >> 1;
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getCurrent(channel);
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}
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}
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//----------------------------------------------------------------------
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// I2C
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//----------------------------------------------------------------------
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void setConfigRegistry(unsigned char channel, bool continuous, bool start) {
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// Start with default values
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uint16_t config = 0;
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config |= _gain; // Set PGA/voltage range (0x0200)
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config |= ADS1X15_REG_CONFIG_DR_MASK; // Always at max speed (0x00E0)
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//config |= ADS1X15_REG_CONFIG_CMODE_TRAD; // Traditional comparator (default val) (0x0000)
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//config |= ADS1X15_REG_CONFIG_CPOL_ACTVLOW; // Alert/Rdy active low (default val) (0x0000)
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//config |= ADS1X15_REG_CONFIG_CLAT_NONLAT; // Non-latching (default val) (0x0000)
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config |= ADS1X15_REG_CONFIG_CQUE_NONE; // Disable the comparator (default val) (0x0003)
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if (start) {
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config |= ADS1X15_REG_CONFIG_OS_SINGLE; // Start a single-conversion (0x8000)
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}
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if (continuous) {
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//config |= ADS1X15_REG_CONFIG_MODE_CONTIN; // Continuous mode (default) (0x0000)
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} else {
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config |= ADS1X15_REG_CONFIG_MODE_SINGLE; // Single-shot mode (0x0100)
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}
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config |= ((channel + 4) << 12); // Set single-ended input channel (0x4000 - 0x7000)
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#if SENSOR_DEBUG
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//Serial.printf("[EMON] ADS1X115 Config Registry: %04X\n", config);
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#endif
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// Write config register to the ADC
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#if I2C_USE_BRZO
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uint8_t buffer[3];
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buffer[0] = ADS1X15_REG_POINTER_CONFIG;
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buffer[1] = config >> 8;
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buffer[2] = config & 0xFF;
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brzo_i2c_start_transaction(_address, I2C_SCL_FREQUENCY);
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brzo_i2c_write(buffer, 3, 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((uint8_t) ADS1X15_REG_POINTER_CONFIG);
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Wire.write((uint8_t) (config >> 8));
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Wire.write((uint8_t) (config & 0xFF));
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Wire.endTransmission();
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#endif
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}
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double getCurrent(unsigned char channel) {
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// Force stop by setting single mode and back to continuous
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static unsigned char previous = 9;
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if (previous != channel) {
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setConfigRegistry(channel, true, false);
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setConfigRegistry(channel, false, false);
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setConfigRegistry(channel, false, true);
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delay(10);
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readADC(channel);
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previous = channel;
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}
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setConfigRegistry(channel, true, true);
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return read(channel);
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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 = 0;
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#if I2C_USE_BRZO
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uint8_t buffer[3];
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buffer[0] = ADS1X15_REG_POINTER_CONVERT;
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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] << 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(ADS1X15_REG_POINTER_CONVERT);
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Wire.endTransmission();
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Wire.requestFrom(_address, (unsigned char) 2);
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value |= Wire.read() << 8;
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value |= Wire.read();
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#endif
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if (_type = ADS1X15_CHIP_ADS1015) value >>= ADS1015_BIT_SHIFT;
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delayMicroseconds(500);
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return value;
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}
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unsigned char _address;
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unsigned char _type = ADS1X15_CHIP_ADS1115;
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unsigned char _mask = 0x0F;
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unsigned int _gain = ADS1X15_REG_CONFIG_PGA_4_096V;
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unsigned char _ports;
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};
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