SmartMIDIFilteredAnalog.hpp

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#pragma once
 
#include <AH/Containers/BitArray.hpp>
#include <AH/Hardware/FilteredAnalog.hpp>
#include <AH/STL/algorithm> // std::fill
#include <Banks/BankableAddresses.hpp>
#include <Def/Def.hpp>
#include <MIDI_Outputs/Abstract/MIDIOutputElement.hpp>
 
BEGIN_CS_NAMESPACE
 
namespace Bankable {

template <uint8_t NumBanks, class BankAddress, class Sender>
class SmartMIDIFilteredAnalog : public MIDIOutputElement {
  protected:
    SmartMIDIFilteredAnalog(BankAddress bankAddress, pin_t analogPin,
                            const Sender &sender)
        : address(bankAddress), filteredAnalog(analogPin), sender(sender) {}
 
  public:
    enum State {
        Active,
        Lower,
        Higher,
    };
 
    void begin() override {
        filteredAnalog.resetToCurrentValue();
        previousBank = address.getSelection();
        std::fill(std::begin(previousValues), std::end(previousValues),
                  initial);
    }
 
    void update() override {
        auto activeBank = address.getSelection();
        if (filteredAnalog.update() || activeBank != previousBank) {
            auto previousValue = previousValues[activeBank];
            auto value = filteredAnalog.getValue();
            if (activeBank == previousBank && state == Higher) {
                if (value <= previousValue)
                    state = Active;
            } else if (activeBank == previousBank && state == Lower) {
                if (value >= previousValue)
                    state = Active;
            } else if (activeBank != previousBank) {
                if (value == previousValue || previousValue == initial)
                    state = Active;
                else if (value > previousValue)
                    state = Higher;
                else
                    state = Lower;
                previousBank = activeBank;
            }
            if (activeBank == previousBank && state == Active) {
                sender.send(value, address.getActiveAddress());
                previousValues[activeBank] = value;
            }
        }
    }

    State getState() const { return state; }

    void activate() { state = Active; }

    void map(MappingFunction fn) { filteredAnalog.map(fn); }

    void invert() { filteredAnalog.invert(); }

    analog_t getRawValue() const { return filteredAnalog.getRawValue(); }

    static constexpr analog_t getMaxRawValue() {
        return FilteredAnalog::getMaxRawValue();
    }

    analog_t getValue() const { return filteredAnalog.getValue(); }

    analog_t getPreviousValue(setting_t bank) const {
        return previousValues[bank];
    }

    analog_t getPreviousValue() const {
        return getPreviousValue(address.getSelection());
    }
 
  protected:
    BankAddress address;
    using FilteredAnalog = AH::FilteredAnalog<Sender::precision()>;
    FilteredAnalog filteredAnalog;
    static_assert(
        Sender::precision() <= 14,
        "Sender precision must be 14 or less, because larger values are "
        "reserved.");
    constexpr static analog_t initial = 1u << 14;
    AH::Array<analog_t, NumBanks> previousValues = {{}};
    State state = Active;
    setting_t previousBank = 0;
 
  public:
    Sender sender;
};
 
} // namespace Bankable
 
END_CS_NAMESPACE