button.h

里面给出了ATmega103单片机编程的C语言实例程序

/* ATmega103 button.h file

   Author : Robert Stuart 
   Company : PDL Industries Ltd
   Date of Creation : 26 August 1999
*/

/* includes */
#include <iom103.h>
#include "logic.h"
#include "ports.h"

/* External Variables */
extern enum
{
  SET=1,
  UP,
  DOWN,
  BUTTON_NONE
} Button;
extern char ButtonStatus;

/* Local Variables */
static unsigned int Buffer;
static enum ButtonMap
{
  SET_MAP=1,
  UP_MAP,
  DOWN_MAP,
  NONE_MAP
}; 				/* the buttons will exist in one of these states */
static enum ButtonMap PushedButton, LastButton;
				/* used to controll the triggering of the buttons */
/* Local Prototypes */
void BufferButton( void );
void DebounceButton( void );
void DetermineButtonState( void );