76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
/**
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* @file converter_sensor.h
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*
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* @date September 12, 2019
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* @author Matthew Kennedy, (c) 2019
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*/
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#pragma once
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#include "converters/sensor_converter_func.h"
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#include "stored_value_sensor.h"
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#include <type_traits>
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struct FunctionalSensorBase : public StoredValueSensor {
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FunctionalSensorBase(SensorType type)
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: StoredValueSensor(type) {}
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virtual void postRawValue(float value) = 0;
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};
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/**
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* @brief Class for sensors that convert from some raw floating point
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* value (ex: voltage, frequency, pulse width) to a sensor reading.
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*
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* To use this class, implement the conversion operation for your sensor
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* as a class that inherits from SensorConverter, and implement convert
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* to convert a raw reading from the sensor to a usable value (and valid bit).
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*
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* Register an instance of the new class with an interface
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* that provides and posts raw values so the sensor can update.
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*/
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template <typename TFunc>
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class FunctionalSensor final : public FunctionalSensorBase {
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static_assert(std::is_base_of_v<SensorConverter, TFunc>, "TFunc must inherit from SensorConverter");
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static_assert(std::is_default_constructible_v<TFunc>, "TFunc must be default constructible");
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public:
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explicit FunctionalSensor(SensorType type)
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: FunctionalSensorBase(type) {}
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void postRawValue(float inputValue) {
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// Report the raw value
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float *rawReportLocation = m_rawReportingLocation;
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if (rawReportLocation) {
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*rawReportLocation = inputValue;
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}
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auto r = m_function.convert(inputValue);
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// This has to happen so that we set the valid bit after
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// the value is stored, to prevent the data race of reading
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// an old invalid value
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if (r.Valid) {
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setValidValue(r.Value);
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} else {
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invalidate();
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}
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}
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void setRawReportingLocation(float *rawReportingLocation) {
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m_rawReportingLocation = rawReportingLocation;
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}
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// Allow access to the underlying function
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TFunc &f() {
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return m_function;
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}
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private:
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float *m_rawReportingLocation = nullptr;
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// Conversion function for this sensor
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TFunc m_function;
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};
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