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264 lines
7.8 KiB
264 lines
7.8 KiB
// -----------------------------------------------------------------------------
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// ECH1560 based power monitor
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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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class ECH1560Sensor : public BaseSensor {
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public:
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// ---------------------------------------------------------------------
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// Public
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// ---------------------------------------------------------------------
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ECH1560Sensor(): BaseSensor() {
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_count = 3;
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_sensor_id = SENSOR_ECH1560_ID;
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}
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~ECH1560Sensor() {
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if (_interrupt_gpio != GPIO_NONE) detach(_interrupt_gpio);
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}
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// ---------------------------------------------------------------------
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void setCLK(unsigned char clk) {
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if (_clk == clk) return;
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_clk = clk;
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_dirty = true;
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}
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void setMISO(unsigned char miso) {
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if (_miso == miso) return;
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_miso = miso;
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_dirty = true;
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}
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void setInverted(bool inverted) {
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_inverted = inverted;
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}
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// ---------------------------------------------------------------------
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unsigned char getCLK() {
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return _clk;
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}
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unsigned char getMISO() {
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return _miso;
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}
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bool getInverted() {
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return _inverted;
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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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pinMode(_clk, INPUT);
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pinMode(_miso, INPUT);
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if (_interrupt_gpio != GPIO_NONE) detach(_interrupt_gpio);
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attach(this, _clk, RISING);
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}
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// Interrupt attach callback
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void attached(unsigned char gpio) {
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BaseSensor::attached(gpio);
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_interrupt_gpio = gpio;
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}
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// Interrupt detach callback
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void detached(unsigned char gpio) {
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BaseSensor::detached(gpio);
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if (_interrupt_gpio == gpio) _interrupt_gpio = GPIO_NONE;
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}
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void ICACHE_RAM_ATTR handleInterrupt() {
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_isr();
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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[25];
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snprintf(buffer, sizeof(buffer), "ECH1560 @ GPIO(%i,%i)", _clk, _miso);
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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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_error = SENSOR_ERROR_OK;
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if (index == 0) return MAGNITUDE_CURRENT;
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if (index == 1) return MAGNITUDE_VOLTAGE;
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if (index == 2) return MAGNITUDE_POWER_APPARENT;
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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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// Current value for slot # index
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double value(unsigned char index) {
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_error = SENSOR_ERROR_OK;
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if (index == 0) return _current;
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if (index == 1) return _voltage;
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if (index == 2) return _apparent;
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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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void ICACHE_RAM_ATTR _isr() {
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// if we are trying to find the sync-time (CLK goes high for 1-2ms)
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if (_dosync == false) {
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_clk_count = 0;
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// register how long the ClkHigh is high to evaluate if we are at the part wher clk goes high for 1-2 ms
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while (digitalRead(_clk) == HIGH) {
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_clk_count += 1;
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delayMicroseconds(30); //can only use delayMicroseconds in an interrupt.
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}
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// if the Clk was high between 1 and 2 ms than, its a start of a SPI-transmission
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if (_clk_count >= 33 && _clk_count <= 67) {
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_dosync = true;
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}
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// we are in sync and logging CLK-highs
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} else {
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// increment an integer to keep track of how many bits we have read.
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_bits_count += 1;
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_nextbit = true;
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}
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}
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void _sync() {
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unsigned int byte1 = 0;
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unsigned int byte2 = 0;
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unsigned int byte3 = 0;
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_bits_count = 0;
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while (_bits_count < 40); // skip the uninteresting 5 first bytes
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_bits_count = 0;
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while (_bits_count < 24) { // loop through the next 3 Bytes (6-8) and save byte 6 and 7 in Ba and Bb
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if (_nextbit) {
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if (_bits_count < 9) { // first Byte/8 bits in Ba
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byte1 = byte1 << 1;
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if (digitalRead(_miso) == HIGH) byte1 |= 1;
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_nextbit = false;
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} else if (_bits_count < 17) { // bit 9-16 is byte 7, stor in Bb
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byte2 = byte2 << 1;
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if (digitalRead(_miso) == HIGH) byte2 |= 1;
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_nextbit = false;
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}
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}
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}
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if (byte2 != 3) { // if bit Bb is not 3, we have reached the important part, U is allready in Ba and Bb and next 8 Bytes will give us the Power.
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// voltage = 2 * (Ba + Bb / 255)
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_voltage = 2.0 * ((float) byte1 + (float) byte2 / 255.0);
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// power:
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_bits_count = 0;
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while (_bits_count < 40); // skip the uninteresting 5 first bytes
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_bits_count = 0;
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byte1 = 0;
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byte2 = 0;
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byte3 = 0;
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while (_bits_count < 24) { //store byte 6, 7 and 8 in Ba and Bb & Bc.
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if (_nextbit) {
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if (_bits_count < 9) {
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byte1 = byte1 << 1;
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if (digitalRead(_miso) == HIGH) byte1 |= 1;
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_nextbit = false;
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} else if (_bits_count < 17) {
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byte2 = byte2 << 1;
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if (digitalRead(_miso) == HIGH) byte2 |= 1;
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_nextbit = false;
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} else {
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byte3 = byte3 << 1;
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if (digitalRead(_miso) == HIGH) byte3 |= 1;
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_nextbit = false;
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}
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}
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}
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if (_inverted) {
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byte1 = 255 - byte1;
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byte2 = 255 - byte2;
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byte3 = 255 - byte3;
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}
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// power = (Ba*255+Bb+Bc/255)/2
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_apparent = ( (float) byte1 * 255 + (float) byte2 + (float) byte3 / 255.0) / 2;
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_current = _apparent / _voltage;
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_dosync = false;
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}
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// If Bb is not 3 or something else than 0, something is wrong!
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if (byte2 == 0) _dosync = false;
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}
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// ---------------------------------------------------------------------
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unsigned char _clk = 0;
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unsigned char _miso = 0;
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unsigned char _interrupt_gpio = GPIO_NONE;
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bool _inverted = false;
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volatile long _bits_count = 0;
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volatile long _clk_count = 0;
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volatile bool _dosync = false;
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volatile bool _nextbit = true;
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double _apparent = 0;
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double _voltage = 0;
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double _current = 0;
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unsigned char _data[24];
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};
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