8051 with ADC conversion and RS232 code

// header files
#include "main.h"
#include "port.h"
#include "delay_loop.h"

int result_G;

void serial_init();
void send_serial(unsigned char *s);
void send_1_char(unsigned char c);

void initialize();      
void start_conversion();

//interrupt1() interrupt 2

void serial_init()
{
    SCON=0x50;        //Setup for 8-bit data
    TMOD=0x20;        //Setup timer 1 for auto-reload
    TH1=0xF3;        //Setup for 2400 Baud
    TR1=1;            //Turn on timer 1
    TI=1;            //Indicate ready to transmit
}


void send_serial(unsigned char *s)
{
    while(*s !=0x00)
    {
        SBUF=*s;
        while(! TI)
        {

        }
        TI=0;

        s++;
    }
}


void send_1_char(unsigned char c)
{
     SBUF=c;
    while(! TI)
    {

    }
    TI=0;
}


void initialize()
{
     ADC_RD=1;
    ADC_WR=1;
    IT1=1;
    EX1=1;
    EA=1;
}


void start_conversion()
{
     ADC_WR=0;
    ADC_WR=1;
}

interrupt1() interrupt 2
{
     ADC_RD=0;
    result_G=DATA;

    ADC_RD=1;
    send_1_char(result_G);
    Delay_Loop(100);
    start_conversion();
}

void main(void)                                  
{
    unsigned char crlf[]={0x0D,0x0A,0x00};
    serial_init();
    send_serial(crlf);
    send_serial("--------------------------------");
    send_serial(crlf);
   

    initialize();
    start_conversion();                         

    while(1)
    {
        LED=ON;
        Delay_Loop(25);
      LED=OFF;
        Delay_Loop(25);
    }
   

}

	PCON |= 0x80;         // Double Baud Rate
	SCON  = 0x50;         // SCON: mode 1, 8-bit UART, enable rcvr
	TMOD |= 0x20;         // TMOD: timer 1, mode 2, 8-bit reload
	TH1   = BAUD_CONST;         // TH1:  reload value
	TL1   = BAUD_CONST;
	TR1   = 1;            // TR1:  timer 1 run
	TI    = 1;
	RI    = 0;