#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/signal.h>


#define IR_LEFT_LED		0
#define IR_RIGHT_LED	1

#define IR_FALSE		0
#define IR_TRUE			1

#define IR_38K_Enable	{ TCCR0 = _BV(CS01);TCNT0 = 256 - 13;  }
#define IR_38K_Disable  { TCCR0 = 0; TCNT0 = 256 - 13;  }

#define IR_600ms_Enable { 	TCNT1H = 0xff - 0x02; TCNT1L = 0xff - 0x4a + 1;TCCR1B = _BV(CS12);}
#define IR_600ms_Disable { 	TCNT1H = 0xff - 0x02; TCNT1L = 0xff - 0x4a + 1;TCCR1B = 0;}
//0928 ,
#define IR_REC_HAVE_SIGN ( (PIND & _BV(PD2)) == 0 ) //檢測到了紅外信號

volatile unsigned char ucIr_LR_Flag;//左右標(biāo)志
volatile unsigned char ucIr_600msOverFlag;//600ms時間到達(dá)標(biāo)志


//38K Hz
SIGNAL(SIG_OVERFLOW0)
{	
	PORTB ^= _BV(PB0);			
	TCNT0 = 256 - 13;
}
//600ms的時間延時
SIGNAL(SIG_OVERFLOW1)
{
	ucIr_600msOverFlag = IR_TRUE;
	//TCNT1H = 0xff - 0x09;
	//TCNT1L = 0xff - 0x28+1;	
}



void Ir_Init(void)
{
	//初始化
	ucIr_LR_Flag = IR_LEFT_LED;
	ucIr_600msOverFlag = IR_FALSE;
	
	//設(shè)置端口方向
	DDRB = 0xff;
	DDRC = 0x7F;
	DDRD = 0x00;	
	
	//設(shè)置TIMER0 計數(shù)器	
	TCNT0 = 256 - 13;
	TCCR0 = _BV(CS01);
	
	//設(shè)置TIMER1 計數(shù)器
	TCCR1A = 0x00;	
	IR_600ms_Disable;	
	
	//使能中斷
	TIMSK = _BV(TOIE0);	
	
	sei();			
}


int Ir_Check(void)
{
	unsigned char ucIsHaveSignFlag;
		
	IR_38K_Enable; //打開38k信號的發(fā)送
	IR_600ms_Enable;//600ms時間計數(shù)開始
	
	ucIr_600msOverFlag = IR_FALSE;
	ucIsHaveSignFlag = IR_FALSE;	
	//等待600ms時間完成	
	while(ucIr_600msOverFlag == IR_FALSE )
	{		
		if(IR_REC_HAVE_SIGN)
		{	//檢測到了信號			
			ucIsHaveSignFlag = IR_TRUE;
			break;
		}
	}
	
	IR_38K_Disable; //關(guān)閉38k信號	
	IR_600ms_Disable;//600ms時間計數(shù)關(guān)閉	
	if( ucIr_LR_Flag == IR_LEFT_LED)	
		PORTB &=~ _BV(PB0);	
	else
		PORTB &=~ _BV(PB1);	

	if(ucIsHaveSignFlag == IR_FALSE) return IR_FALSE; //沒有找到
	
	IR_600ms_Enable;//600ms時間計數(shù)開始
	ucIsHaveSignFlag = IR_FALSE;
	ucIr_600msOverFlag = IR_FALSE;	
	//等待600ms時間完成	
	while(ucIr_600msOverFlag == IR_FALSE)
	{
		if( IR_REC_HAVE_SIGN )
		{	//檢測到了信號			
			ucIsHaveSignFlag = IR_TRUE;
			break;
		}
	}
	IR_600ms_Disable;//600ms時間計數(shù)關(guān)閉
	
	if(ucIsHaveSignFlag == IR_TRUE) return IR_FALSE; //如果找到,則信號不正確	
	
	//由信號
	return IR_TRUE;	
}


int main(void)
{

	int iRetVal;
	Ir_Init();

	while(1)
	{
		
		//iRetVal = Ir_Check();
		
		if(ucIr_LR_Flag == IR_LEFT_LED)
		{	
			if( iRetVal == IR_TRUE)
			{
				PORTC |= _BV(PC0);
			}
			else
			{
				PORTC &=~ _BV(PC0);
			}
			ucIr_LR_Flag = IR_RIGHT_LED;
		}
		else
		{
			if( iRetVal == IR_TRUE)
			{
				PORTC |= _BV(PC1);
			}
			else
			{
				PORTC &=~ _BV(PC1);
			}
			ucIr_LR_Flag = IR_LEFT_LED;
		}		
	
	}
	return 0;
}