typedefs.h

#ifndef TYPE_DEFS_H_
#define TYPE_DEFS_H_

#include <stdint.h>

//set bit	or PORTB |= (1<<3); 
//#define set_bit(port, bit) ((port) |= (uint8_t)(1 << bit))
//clear bit
//#define clr_bit(port, bit) ((port) &= (uint8_t)~(1 << bit))	

#define INPUT 0
#define OUTPUT 1

typedef enum _BOOL { FALSE = 0, TRUE } BOOL;

// Code courtesy of: stu_san on AVR Freaks

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; 


#define REGISTER_BIT(rg,bt) ((volatile _io_reg*)&rg)->bit##bt


/* Example:

#define BUTTON_PIN  REGISTER_BIT(PINB,3)
#define LED_PORT    REGISTER_BIT(PORTB,4)

#define BUTTON_DIR  REGISTER_BIT(DDRB,3)
#define LED_DIR     REGISTER_BIT(DDRB,4)
 
main() 
{
	uint8_t is_button = BUTTON_PIN;
	// this actually is expanded by the C preprocessor to:
	// uint8_t is_button = ((volatile _io_reg*)&PINB)->bit3; 

  LED_DIR = 1;
	// which after the preprocessor looks like: 
	// ((volatile _io_reg*)&DDRB)->bit4 = 1; 

  BUTTON_DIR = 0;

  while (1) {
    LED_PORT = BUTTON_PIN;
  }
} 

*/


#endif