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interfacing at89s52 with bluetooth

keshav bharadwaj

I am new to microcontrollers and this is a program I wrote in order to interface AT89s52 to
the hc05 Bluetooth module .The desired output is not obtained what is going wrong here?

#include<stdio.h>
#include<reg51.h>
sbit x=P2^0;
sbit y=P2^1;
sbit z=P2^2;
char read[5];
void uart()
{       SCON=0x50;
        TMOD=0x20;
        TH1=0xFd;
        TR1=1;
}
void feedback()
{       if(x==1)
        {SBUF='A'
        while(TI!);
        TI=0;
        SBUF='H'
        while(TI!);
        TI=0;
        }
        if(y==1)
        {SBUF='B'
                while(!TI);
                TI=0;
                SBUF='H'
                while(!TI);
                TI=0;
        }
        if(z==1)
        {SBUF='C'
                while(!TI);
                TI=0;
                SBUF='H'
                while(!TI);
                TI=0;
        }
}
void main()
{       char i,j;
        x=y=z=0;
        i=3;
        j=0;
        uart();
        while(!RI&&i>0)
        {       read[j]=SBUF;
                RI=0;
                j++;

        }
        if(read[0]=='O'||read[0]=='o'&&read[1]=='N'||read[1]=='n')
        {               switch(read[2])
                {               case'A':
                                case'a':        x=1;
                                                        break;
                                case'B':
                                case'b':
                                                        y=1;

                                                        break;
                                case'C':
                                case 'c':
                                                        z=1;

                                                        break;
                                default :
                                                        SBUF='N';
                                                        while(!TI)
                                                        TI=0;
                                                        SBUF='O';
                                                        while(!TI)
                                                        TI=0;


                                }
        }
                if(read[0]=='O'||read[0]=='o'&&read[1]=='F'||read[1]=='f')
                {       switch(read[2])
                                {                       case'A':
                                                        case'a': x=0;
                                                        break;
                                                        case'B':
                                                        case'b': y=0;
                                                        break;
                                                        case'C':
                                                        case 'c';       z=0;
                                                        break;
                                                        default :
                                }
                        }
                                feedback();
                }