#include <reg51.h>
#define c(x) (x*110592/120000)
sbit Ir_Pin=P3^2;
sbit beep=P3^6;
unsigned char code Led_Tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xbf}; //共陽極數碼顯示碼0-F.
unsigned char code Led_Sel[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
unsigned char Led_Buf[7]; //顯示緩沖區
char Led_Index; //位選
unsigned char Ir_Buf[4]; //用于保存解碼結果
void delay_50ms(unsigned int t)
{
unsigned int j;
for(;t>0;t--)
for(j=6245;j>0;j--)
{;}
}
//==============================================================
//數碼管掃描
timer0() interrupt 1 using 1
{
TL0=65536-1000;
TH0=(65536-1000)/256; //定時器0設定約1000us中斷一次，用于數碼管掃描
P0=0xff;
P2=Led_Sel[Led_Index]; //位選
P0=Led_Tab[Led_Buf[Led_Index]]; //段選
if(++Led_Index>7) Led_Index=0; //八個掃描完了,到第一個數碼管
}
//==============================================================
unsigned int Ir_Get_Low()
{
TL1=0;
TH1=0;
TR1=1;
while(!Ir_Pin && (TH1&0x80)==0);
TR1=0;
return TH1*256+TL1;
}
//=============================================================
unsigned int Ir_Get_High()
{
TL1=0;
TH1=0;
TR1=1;
while(Ir_Pin && (TH1&0x80)==0);
TR1=0;
return TH1*256+TL1;
}
//==============================================================
main()
{
unsigned int temp;
char i,j;
Led_Index=0;
TMOD=0x11;
TL0=65536-1000;
TH0=(65536-1000)/256; //定時器0設定約1000us中斷一次，用于數碼管掃描
EA=1;
ET0=1;
TR0=1;
//Led_Buf[0]=0;
//Led_Buf[1]=0;
//Led_Buf[2]=0;
//Led_Buf[3]=0; //顯示區設成0
// Led_Buf[4]=0;
//Led_Buf[5]=0;
//Led_Buf[6]=0;
//Led_Buf[7]=0; //顯示區設成0
do{
restart:
while(Ir_Pin);
temp=Ir_Get_Low();
if(temp<c(8500) || temp>c(9500)) continue;//引導脈沖低電平9000
temp=Ir_Get_High();
if(temp<c(4000) || temp>c(5000)) continue;//引導脈沖高電平4500
for(i=0;i<4;i++) //4個字節
for(j=0;j<8;j++) //每個字節8位
{
temp=Ir_Get_Low();
if(temp<c(200) || temp>c(800)) goto restart;
temp=Ir_Get_High();
if(temp<c(200) || temp>c(2000)) goto restart;
Ir_Buf[i]>>=1;
if(temp>c(1120)) Ir_Buf[i]|=0x80;
}
Led_Buf[0]=(Ir_Buf[0]/16)&0xf;//顯示結果
Led_Buf[1]=Ir_Buf[0]&0xf; //顯示結果
Led_Buf[2]=(Ir_Buf[1]/16)&0xf; //顯示結果
Led_Buf[3]=Ir_Buf[1]&0xf; //顯示結果
Led_Buf[4]=(Ir_Buf[2]/16)&0xf; //顯示結果
Led_Buf[5]=Ir_Buf[2]&0xf; //顯示結果
Led_Buf[6]=(Ir_Buf[3]/16)&0xf; //顯示結果
Led_Buf[7]=Ir_Buf[3]&0xf; //顯示結果
beep=0;
delay_50ms(2);
beep=1;
}
while(1);
}
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