ir.c

15寸

#include <at89x52.h>
//#include <stdio.h>

#define ir P3_2


bit is_ir_err;
bit is_ir_continue;
bit is_ir;
unsigned char data d[4];
//12MHz


void delay(unsigned char t)
{
    unsigned char data i;
    for(i=0;i<t;i++);
}

void ir_int(void) interrupt 0
{
    unsigned char i;
    unsigned char j;


    EA = 0;

    for(i=0; i<3; i++)
    {
        delay(138);//--1.125ms--
        delay(138);//--1.125ms--
        if(ir == 1)
        {
            is_ir_err = 1;
            EA = 1;
            return;
        }
    }

    while(ir != 1);
    delay(138);//--1.125ms--
    if(ir == 0)
    {
        is_ir_err = 1;
        EA = 1;
        return;
    }

    delay(207);//--1.6875ms--
    if(ir == 0)
    {
        is_ir_continue = 1;
        EA = 1;
        return;
    }

    while(ir != 0);
    delay(34);//--0.28125ms--
    
    for(j = 0; j<4; j++)
    {
        for(i=0;i<8;i++)
        {
            while(ir != 1);
            //ir == 1
            delay(104);//--0.84375ms--
            if(ir == 0) // is "0"
            {
                d[j] = d[j]<<1;
            }
            else        // is "1"
            {
                d[j] = d[j]<<1;
                d[j]++;
                delay(138);//1.125ms   
                if(ir == 1)
                {
                    is_ir_err = 1;
                    EA = 1;
                    return;
                }
            }
        }
    }
    is_ir = 1;
    EA = 1;
}

unsigned char ir_recv(void)
{
    if(d[2] == ~d[3])
    {
        is_ir_err = 0;
        return d[2];
    }else{
        is_ir_err = 1;
    }
}