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124 lines
3.5 KiB
124 lines
3.5 KiB
// -----------------------------------------------------------------------------
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// MAX6675 Sensor
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// Uses MAX6675_Thermocouple library
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// Copyright (C) 2017-2019 by Xose Pérez <andrade dot luciano at gmail dot com>
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// -----------------------------------------------------------------------------
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#if SENSOR_SUPPORT && MAX6675_SUPPORT
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#pragma once
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#include <MAX6675.h>
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#include <vector>
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#include "BaseSensor.h"
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class MAX6675Sensor : public BaseSensor {
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public:
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void setCS(unsigned char pin_cs) {
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if (_pin_cs == pin_cs) return;
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_pin_cs = pin_cs;
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_dirty = true;
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}
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void setSO(unsigned char pin_so) {
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if (_pin_so == pin_so) return;
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_pin_so = pin_so;
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_dirty = true;
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}
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void setSCK(unsigned char pin_sck) {
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if (_pin_sck == pin_sck) return;
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_pin_sck = pin_sck;
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_dirty = true;
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}
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// ---------------------------------------------------------------------
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// Sensor API
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// ---------------------------------------------------------------------
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unsigned char id() const override {
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return SENSOR_MAX6675_ID;
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}
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unsigned char count() const override {
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return 1;
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}
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// ---------------------------------------------------------------------
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// Initialization method, must be idempotent
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void begin() override {
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if (!_dirty) return;
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if (_max) {
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_max.reset(nullptr);
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}
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// MAX6675 Units to readout temp (0 = raw, 1 = ˚C, 2 = ˚F)
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_max = std::make_unique<MAX6675>(_pin_cs, _pin_so, _pin_sck, 1);
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_ready = true;
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_dirty = false;
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}
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// Loop-like method, call it in your main loop
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void tick() override {
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const auto now = TimeSource::now();
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if (now - _last_reading > ReadInterval) {
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_last_reading = now;
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_value = _max->read_temp();
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}
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}
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// Descriptive name of the sensor
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String description() const override {
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return F("MAX6675");
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}
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String address(unsigned char) const override {
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char buffer[16] {0};
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snprintf_P(buffer, sizeof(buffer),
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PSTR("%hhu:%hhu:%hhu"), _pin_cs, _pin_so, _pin_sck);
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return String(buffer);
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}
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// Type for slot # index
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unsigned char type(unsigned char index) const override {
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if (index == 0) return MAGNITUDE_TEMPERATURE;
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return MAGNITUDE_NONE;
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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() override {
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_error = SENSOR_ERROR_OK;
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}
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// Current value for slot # index
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double value(unsigned char index) override {
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if (index == 0) {
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return _value;
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}
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return 0.0;
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}
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private:
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using TimeSource = espurna::time::CoreClock;
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static constexpr auto ReadInterval = TimeSource::duration { 3000 };
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TimeSource::time_point _last_reading = TimeSource::now();
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unsigned char _pin_cs = MAX6675_CS_PIN;
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unsigned char _pin_so = MAX6675_SO_PIN;
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unsigned char _pin_sck = MAX6675_SCK_PIN;
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bool _busy = false;
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double _value = 0;
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std::unique_ptr<MAX6675> _max;
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};
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#endif // SENSOR_SUPPORT && MAX6675_SUPPORT
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