button.h

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#ifndef BUTTON_UTILS_H
#define BUTTON_UTILS_H

#include <stdbool.h>

struct debouncer {
    bool current_value;
    int reset_count;
    int current_count;
};

void debouncer_init(
    struct debouncer *self, int count, bool initial);

void debouncer_set_count(struct debouncer *self, int count);

bool debouncer_update(struct debouncer *self, bool value);

bool debouncer_value(struct debouncer *self);

enum edge_detector_edge {
    EDGE_NONE,
    EDGE_RISING,
    EDGE_FALLING,
};

struct edge_detector {
    bool value;
};

void edge_detector_init(struct edge_detector *self, 
    bool initial);

enum edge_detector_edge 
    edge_detector_update(struct edge_detector *self, 
                         bool value);

bool edge_detector_get_value(struct edge_detector *self);

enum button_event {
    BUTTON_EVENT_PRESS,
    BUTTON_EVENT_RELEASE,
    BUTTON_EVENT_HOLD
};

enum button_timer_state {
    BUTTON_TIMER_IDLE,
    BUTTON_TIMER_HOLD,
    BUTTON_TIMER_REPEAT
};

struct button {
    struct edge_detector edge_detector;
    void (*handler)(enum button_event, void *);
    bool use_hold_timer;
    bool use_repeat_timer;
    enum button_timer_state timer_state;
    unsigned long long time;
    unsigned long long hold_time;
    unsigned long long repeat_time;
};

void button_init(struct button *self, bool initial, 
    void (*handler)(enum button_event, void *));

void button_set_hold_time(struct button *self, 
    unsigned long long time, bool use);
void button_set_repeat_time(struct button *self, 
    unsigned long long time, bool use);

bool button_get_value(struct button *self);

bool button_update(struct button *self, 
                   unsigned long long time, 
                   bool value,
                   void *ctx);

#endif //BUTTON_UTILS_H