debouncer.h

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#pragma once
#include <stdint.h>
 
namespace modules {
 
namespace debounce {
 
class Debouncer {
public:
    inline constexpr Debouncer(uint8_t debounceTimeout)
        : timeLastChange(0)
        , debounceTimeout(debounceTimeout) {}
 
    inline bool Pressed() const { return f.state == State::WaitForRelease; }
 
    void Step(uint16_t time, bool press);
 
private:
    enum State {
        Waiting = 0,
        Detected,
        WaitForRelease,
        Update
    };
 
    struct Flags {
        uint8_t state : 2; 
        uint8_t tmp : 1; 
        inline constexpr Flags()
            : state(State::Waiting)
            , tmp(false) {}
    };
 
    Flags f;
 
    uint16_t timeLastChange;
    uint8_t debounceTimeout;
};
 
} // namespace debounce
} // namespace modules
 
namespace md = modules::debounce;