#include "STC89C51RC.H"

sbit DQ  = P4^3;
sbit SPK = P1^0;

unsigned char irm_code[6];

void delay(unsigned int t)
{			   
	while(t--);	
}
void Sound(void)
{
	SPK = 0;
	delay(10000);
	SPK = 1;
}

void rs232_port_init(void)
{
	SCON=0x50;	//串口工作在方式1，異步模式
	PCON=0x80;	//波特率翻倍
	TMOD=0x20;  //定時器1工作在方式2			
	TH1=0xff; 	//波特率115200，晶振為22.1184MHz
	TL1=0xff;						  	
	TR1 = 1;
	RI  = 0;
	TI  = 0;
}

void uart_putc(unsigned char c)
{
	SBUF = c;
	while(!TI);
	TI = 0;
} 

//STC單片機特有的外部中斷INT2實現紅外解碼
//解碼結果由數據緩沖區(qū)返回
void IRMint(void) interrupt 6
{		
	unsigned int temp;
	unsigned char i,j;

	EA = 0;/*解碼過程禁止其它中斷發(fā)生*/
	temp = 0;
	while(!DQ) if(temp++>0x1000) goto return_main;//防止意外死機	
	if (temp < 0x0200) goto return_main;//Max=0x0222
	/*以上完成引導碼9ms的低電平檢測*/
	temp = 0;
	while(DQ) if(temp++>0x1000)goto return_main;
	if (temp < 0x0150) goto return_main;//Max=0x0216
	/*以上完成引導碼4.5ms的高電平檢測*/
		
	for(j=0;j<6;j++)
	{
		for(i=0;i<8;i++)
		{ 
			irm_code[j]<<=1;
			temp = 0;
			while(!DQ)if(temp++>0x1000) goto return_main;//通過編碼低電平
			temp = 0;
			while(DQ) if(temp++>0x1000) goto return_main;
			if(temp > 0x0060) irm_code[j] |= 0x01;
		}
	}

	/*將結果6字節(jié)從串口發(fā)出*/
	for(j=0;j<6;j++)
	{
		uart_putc(irm_code[j]);	
	}
	Sound();	
	return_main:EA = 1;
}

void main()
{		
	rs232_port_init();
	EA = 1;
	IT2 = 1;//下降沿中斷
	EX2 = 1;

	while(1)
	{				
						
	}
}