#include <at89x52.h>

#define  DAT P2_1                   //模擬串口數據發送端
#define  CLK P2_0                   //模擬時鐘控制端  

unsigned char code                  //數碼管顯示段碼
tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xff};//0-9,-,全滅 
 
unsigned char HongwaiCommand;
unsigned char DaiMa;
unsigned char HongwaiInt;
unsigned char BiaoZhi1,BiaoZhi2;

void SysConfig(void);
bit  HongwaiDecode(void);
void sendbyte(unsigned char byte);
void putnum(unsigned char i);
void KeyAction(unsigned char key);

void main(void)
{
	SysConfig();
	putnum(123);
	while(1)
		{
		 if(BiaoZhi1 == 1)
		 	{
			 BiaoZhi1 = 0;
			 if(HongwaiDecode())
			 	{
				 if(BiaoZhi2 == 1)
				     {		   					  
					  KeyAction(HongwaiCommand);
					  BiaoZhi2 = 0;
					  }
				}
			}
		}		 
}

void SysConfig(void)
{
	TMOD = 0x11;
	IT1  = 1;
	EX1  = 1;
	ET0  = 0;
	EA   = 1;
}

bit HongwaiDecode(void) 
{
	static idata unsigned char INTCount = 0;
	static unsigned long idata HongwaiData = 0;
	unsigned char HongwaiData1,HongwaiData2,HongwaiData3,HongwaiData4;
	if(HongwaiInt)
		{
		 if((DaiMa>0x32)&&(DaiMa<0x36))
		 	{
			 HongwaiData = 0;
			 INTCount = 0;
		 	}
		 	else if((DaiMa>0x07)&&(DaiMa<0x09))
		 	{
			 HongwaiData = (HongwaiData<<1)+1;
			 INTCount++;
			}
		 	else if((DaiMa>0x03)&&(DaiMa<0x05))
		 	{
			 HongwaiData = (HongwaiData<<1)+0;
			 INTCount++;
			}
		 	else if((DaiMa>0x2a)&&(DaiMa<0x2c))
		 	{
			 HongwaiInt = 0;
			 HongwaiData = 0;
		//	 HongwaiCommand = 0xff;
			 return 0;
			}
		 	else
		 	{
			 INTCount = 33;
			 HongwaiData = 0;
			}
		HongwaiInt = 0;
		if(INTCount == 32)
			{
			 HongwaiData1 = (unsigned char)(HongwaiData>>24);
			 HongwaiData2 = (unsigned char)(HongwaiData>>16);
			 HongwaiData3 = (unsigned char)(HongwaiData>>8);
			 HongwaiData4 = (unsigned char)(HongwaiData);
			 HongwaiData = 0;
			 if(HongwaiData3 = ~HongwaiData4)
			 	{
				 HongwaiCommand = HongwaiData3;
				 BiaoZhi2 = 1;
				 return 1;
				}
			 	else return 0;
			}
		 else return 0;
		}

	else return 0;
}

void sendbyte(unsigned char byte)
{    
 unsigned char num,c; 
 num=tab[byte];
 for(c=0;c<8;c++)
 {
 CLK=0;
 DAT=num&0x80; 
 CLK=1;
 num<<=1;       
  }	   
}


void putnum(unsigned char i)
{
 unsigned char a,b,c;

 a = i/100;
 b = (i%100)/10;
 c = i%10;
 sendbyte(c);
 sendbyte(b);
 sendbyte(a);
}

void KeyAction(unsigned char key)
{
	switch(key)
		{
		 case 144:
			key = 0;
		 	putnum(1);
			break;
		 case 184:
		    key = 0;
		 	putnum(2);
			break;
		 case 248:
		    key = 0;
		 	putnum(3);
			break;
		 case 176:
		    key = 0;
		 	putnum(4);
			break;
		 case 152:
		    key = 0;
		 	putnum(5);
			break;
		 case 216:
		    key = 0;
		 	putnum(6);
			break;
		 case 136:
		    key = 0;
		 	putnum(7);
			break;
		 case 168:
		    key = 0;
		 	putnum(8);
			break;
		 case 232:
		    key = 0;
		 	putnum(9);
			break;
		 case 128:
		    key = 0;
		 	putnum(10);
			break;
		 case 72:
		    key = 0;
		 	putnum(11);
			break;
		 case 240:
		    key = 0;
		 	putnum(12);
			break;
		 case 192:
		    key = 0;
		 	putnum(13);
			break;
		 case  88:
		    key = 0;
		 	putnum(15);
			break;
		 case 112:
		    key = 0;
		 	putnum(16);
			break;
		 default :
		    key = 0;
			break;
		}  
}

void Int1(void) interrupt 2 using 2
{
 EX1 = 0;
 TR0 = 0;
 BiaoZhi1 = 1;
 HongwaiInt = 1;
 DaiMa = TH0;
 TH0 = 0;
 TL0 = 0;
 TR0 = 1;
 EX1 = 1;
}