51单片机红外遥控发射NEC协议程序

以下是51单片机红外遥控发射NEC协议的程序代码：

#include<reg51.h>
#define uint unsigned int
#define uchar unsigned char

uchar code table[33] = {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff};
uchar count, i, j;

void delay(uint x)
{
    uint i,j;
    for(i=x;i>0;i--)
        for(j=110;j>0;j--);
}

void sendone(void)
{
    P1 = 0; 
    delay(1);
    P1 = 1;
    delay(2);
    P1 = 0;
    delay(1);
}

void sendzero(void)
{
    P1 = 0;
    delay(1);
    P1 = 1;
    delay(1);
    P1 = 0;
    delay(2);
}

void send(uchar data)
{
    uchar i;
    for(i=0;i<8;i++)
    {
        if(data&0x01)
            sendone();
        else
            sendzero();
        data >>= 1;
    }
}

void main()
{
    TMOD = 0x01;
    TH0 = 0xFC;
    TL0 = 0x67;
    TR0 = 1;
    ET0 = 1;
    EA = 1;

    while(1)
    {
        send(0x00);
        send(0x00);
        send(0x00);
        send(0x00);
        send(0x00);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        send(0xff);
        send(0x00);
        delay(100);
    }
}

void timer0() interrupt 1
{
    TH0 = 0xFC;
    TL0 = 0x67;
    count++;
    if(count == 15)
    {
        P1 = 1;
        delay(1);
        P1 = 0;
        count = 0;
    }
}

该程序使用了51单片机的定时器和外部中断，通过红外发射管发送NEC协议格式的红外码。在main函数中循环发送了一组红外码，通过定时器中断控制红外码的发送频率。其中sendone和sendzero函数分别表示发送1和0的红外码，send函数用于发送8位数据。注意在使用该程序时需要根据具体硬件电路设计进行相应的修改。