types.h

#ifndef _TYPES_H_
#define _TYPES_H_

#include <stdint.h>

typedef enum {false, true} bool_t;
typedef enum { DOWN, UP } button_state_t;
typedef enum { PA, PB, PC, PD } button_port_t;
typedef struct {
  unsigned int subseconds:10;
  unsigned char seconds:6;
  unsigned char minutes:6;
  unsigned char hours:5;
  uint16_t tseconds;
} myclock_t;

typedef struct
{
  unsigned int bit0:1;
  unsigned int bit1:1;
  unsigned int bit2:1;
  unsigned int bit3:1;
  unsigned int bit4:1;
  unsigned int bit5:1;
  unsigned int bit6:1;
  unsigned int bit7:1;
} _io_reg; 

typedef struct {
  uint32_t update_time, down_time; // 64 bits
  button_state_t current, old, new; // 16 bits
  uint8_t pin; // 8 bits
  button_port_t port; // 8 bits
} button_t; // 96 bits / 12 bytes

#endif