irdecoder_int.h

带遥控的液晶显示程序

//12.000MHZ  外部中断解码
#ifndef RedKeyScan_C51_DEFINE_2003_8_31_ZY_YKB_1
#define RedKeyScan_C51_DEFINE_2003_8_31_ZY_YKB_1
#define word unsigned int 
#define byte unsigned char


byte code RedCode []={0x90,0x00,0x10,0x08,0x18,0x04,0x14,0x0c,0x1c,0x80, //0~9
                     0x40,0x88,0x4C,				//OFF  10+ silent   (10, 11, 12 )
		     		 0x44,0x54,0x50,0x48,		//UP,DOWN, LEFT,RIGHT,  (13, 14, 15, 16)
		     		 0xEC,0xF4,0xE8,0x5C}; //INC,SEL,TIME,TV/AV		    (17, 18, 19, 20)

void InitRedKey(void)
{	
	TMOD|=0x10;      //选择定时器1的模式1, 16位定时器
	ET1=0;          //关闭定时器1的中断
	TR1=1;			//启动定时器1,
	IT1=1;		//选择外部中断触发类型为下降沿触发
	EX1=1;		//开启外部中断0	
	EA=1;		//允许中断
	//BeepIO=0;		//close beep
}
/*
void Delay50us(word count)
{
	word i,j;
	for(i=0;i<count;i++)
		for(j=0;j<6;j++);
}
*/


word FullCode=0xFFFF;
byte TestCode=0xFF; 

byte value=0, i=0,key; 

RedKeyScan() interrupt 2 
{
	
		if(TR1==0)	
			{
				TR1=1;TH1=TL1=0;      
			}

		if(TR1==1); 
				{	  
					value=TH1;
					
				 	TH1=TL1=0;
					if(value>11)return;
					
					FullCode=FullCode<<1;
					if(value>5&&value<9)
						{
							//TR1=0;
							FullCode=FullCode|0x01;
						}
					i++;
					
				}
				
			
		if(i>15)
			{	
				if((FullCode&0xFF00)==0xE200)    //11100010B,0xE2,sign code
					{   
						 TestCode=(byte)(FullCode&0x00FF);				
						 for(i=0; i<25; i++)
							{
						   		if(TestCode==RedCode[i])
							 		{
										key=i;
	   								}	
							}
					}
					else return ;
			}
	return;
}

#endif