timer.c

AVR单片机ATMEGA128实习之—定时器中断（附带Proteus仿真例子）

#include <iom128.h>
#include <macros.h>


#define	  Red_LED_on		PORTB&~BIT(0)
#define	  Red_LED_off		PORTB|(1<<0)
#define	  Green_LED_on		PORTB&(~(1<<1))
#define	  Green_LED_off		PORTB|(1<<1)
#define	  Yellow_LED_on		PORTB&(~(1<<2))
#define	  Yellow_LED_off	PORTB|(1<<2)
#define	  Flag_H			PORTB|(1<<3)
#define	  Flag_L			PORTB&~(1<<3)	

#pragma interrupt_handler Timer_INT:15   //定时器中断

void Port_initilaze(void);
void Timer_initilaze(void);


unsigned char flag = 0;

void main(void)
{
	unsigned char achar;
	unsigned char i;

	Port_initilaze(); 
	Timer_initilaze();
	
	
	
	PORTB = Red_LED_on;
	PORTB = Yellow_LED_on;
	//PORTB = Green_LED_on;
	
	
	for(;;)
	{	
		if (flag == 0)
		{
			PORTB = Flag_H;
			PORTB = Green_LED_off;
		}
		else
		{
			PORTB = Flag_L;
			PORTB = Green_LED_on;	
		}
	}

}

void Port_initilaze(void)
{
	DDRB = 0xFF;
	PORTB = 0xFF;
}
void Timer_initilaze(void)
{
	TCCR1A = 0x00;		//普通方式，引脚作IO用
	TCCR1B = 0x02;		//CK/8
	TCCR1C = 0;
	TCNT1 = 0x3d09;		//15625-65535递增，到0溢出
	TIMSK = 0x04;		//开放T1溢出中断

	SEI();

}
void Timer_INT(void)
{
	TCNT1 = 0x3d09;
	flag = ~flag;
	PORTB = Green_LED_on;
}