Accum-Tester/inc/buttons.h

#pragma once
#ifndef _BUTTONS_H_
#define _BUTTONS_H_

/* time constant in ms */
#define BTN_SCAN_PERIOD     10
#define BTN_SCAN_PAUSE      (200/BTN_SCAN_PERIOD)
#define BTN_TIME_PRESSED    (30/BTN_SCAN_PERIOD)
#define BTN_TIME_HOLDED     (500/BTN_SCAN_PERIOD)
#define BTN_TIME_REPEATED   (50/BTN_SCAN_PERIOD)

/* type defs */
typedef enum btn_num {
  Button1 = 0,
  Button2 = 1,
  Button3 = 2,
  Button4 = 3,
  Button_Num = 4
} button_num_t;

typedef enum btn_state {
  BTN_st_Clear = 0,
  BTN_st_Pressed,
  BTN_st_Holded,
  BTN_st_Released
} button_state_t;

/* Handler function type */
typedef void (*btn_hndlr)(const button_state_t);

/* function prototypes */
#ifdef __cplusplus
extern "C" {
#endif
  void buttons_Init(btn_hndlr ha[]);
  button_state_t buttons_GetState(const button_num_t btn);
#ifdef __cplusplus
}
#endif

#endif /* _BUTTONS_H_ */