program for ADC 0804 using 8051

/*********************** ADC-0804***************************/

#include<reg51.h>

#define lcd P0

sbit rs=P2^7;                                   // assining control pins to port2.5,6,7

sbit rw=P2^6;

sbit en=P2^5;

       // control pins of adc

sbit rd=P2^0;

sbit wr=P2^1;

sbit intr=P2^2;

#define MYDATA P1

void hex2dec(unsigned int);

void initlcd(void);

void cmdlcd(unsigned char);

void displcd(unsigned char);

void writelcd(unsigned char);

void strlcd(unsigned char*);

void intlcd(unsigned int);

delay(unsigned int);

void main()

{

         unsigned char value;

        //MYDATA=0xFF;

        intr=1;

         rd=1;

       wr=1;

       initlcd();

       strlcd("welcome");

      c mdlcd(0x01);

      while(1)

      {

          wr=0;

          wr=1;

         while(intr==1);              //monitoring end of conversion bit until intr equal to 0

         rd=0;

         value=MYDATA;

         hex2dec(value);

      }

}

// the function is used to convert the integer value to ascii value

void hex2dec(unsigned int binbyte)

 {

      unsigned int x,d1,d2,d3,d4;

     x=binbyte/10;

     d1=binbyte%10;

     d2=x%10;

     d3=x/10;

     d4=d3*100+d2*10+d1;

     cmdlcd(0x01);

     cmdlcd(0xc0);

     displcd(d3+0x30);

     displcd(d2+0x30);

     displcd(d1+0x30);

}

            void initlcd()

      {

          cmdlcd(0x38);

          cmdlcd(0x0e);

          cmdlcd(0x01);

          cmdlcd(0x06);

          cmdlcd(0x80);

      }

     void writelcd(unsigned char c)

      {

        lcd=c;

        rw=0;

        en=1;

        delay(1);

        en=0;

     }

void cmdlcd(unsigned char c)

{

rs=0;

writelcd(c);

}

void displcd(unsigned char c)

{

rs=1;

writelcd(c);

}

        void strlcd(unsigned char *s)

           {

            while(*s)

           {

             displcd(*s++);

            }

          }

delay(unsigned int x)

{

    unsigned int i,j;

    for(;x>0;x--)

    for(i=0;i<244;i++)

    for(j=0;j<244;j++);

}