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#include <reg52.h>




#define c(x) (x*110592/120000)


sbit Ir_Pin = P3^5;


unsigned char Ir_Buf[4]; //用于保存解码结果




// UART初始化
// 波特率：9600
void uart_init(void)
{
    unsigned char u;


    ET1=0;


    TMOD = 0x21;        // 定时器1工作在方式2（自动重装）
    SCON = 0x50;        // 10位uart


    TH1 = 0xFD;
    TL1 = 0xFD;


    u = SBUF;
    TR1 = 1;
}


// 获取低电平时间
unsigned int Ir_Get_Low()
{
TL0 = 0;
TH0 = 0;
TR0 = 1;
while (!Ir_Pin && (TH0&0x80)==0);  
              
TR0 = 0;           
return (TH0 * 256 + TL0);
}


// 获取高电平时间
unsigned int Ir_Get_High()
{
TL0 = 0;
TH0 = 0;
TR0 = 1;
while (Ir_Pin && (TH0&0x80)==0);


TR0 = 0;
return (TH0 * 256 + TL0);
}




main()
{
unsigned int temp;
char i,j;


uart_init();

while (1)
{
while (Ir_Pin);


temp = Ir_Get_Low();
if (temp < c(8500) || temp > c(9500))  //引导脉冲低电平9000
continue;
temp = Ir_Get_High();
if (temp < c(4000) || temp > c(5000))  //引导脉冲高电平4500
continue;


for (i=0; i<4; i++) //4个字节
{
for (j=0; j<8; j++) //每个字节8位
{
temp = Ir_Get_Low();
if(temp < c(200) || temp > c(800))
continue;


temp = Ir_Get_High();
if(temp < c(200) || temp > c(2000))
continue;


Ir_Buf[i] >>= 1;
if(temp > c(1120)) 
Ir_Buf[i]|=0x80;
}
}


SBUF = Ir_Buf[2]; // 返回键码
   while (TI == 0);
        TI = 0;
}
}

跟高手学习一下。