PCF8591 interfacing with 8051| ADC interfacing with 8051 microcontroller...

code:-



//----------------------------------HEADER Declarations--------------------------------------//

#include <reg51.h>



#include "adc8591.h"



//----------------------------------LCD Declarations--------------------------------------//

void initlcd(void);

void cmd_lcd(unsigned char command);

void data_lcd(unsigned char data2lcd);

void lcd_shortdelay(void);

void delay_ms(unsigned char milliseconds);

void printnum_lcd(unsigned char message, unsigned char row, unsigned char col);  //ascii to decimal

void printlcd(unsigned char *message, unsigned char row, unsigned char col);



sbit enable=P3^4;

sbit regsel=P3^5;

#define LCD_PORT P1



#define CLR_LCD cmd_lcd(0x01); delay_ms(5)

#define RETURN_HOME_LCD cmd_lcd(0x02); delay_ms(5) 



//----------------------------------ADC value--------------------------------------//

unsigned char ADC0,ADC1,ADC2,ADC3,temp;



//----------------------------------MAIN program--------------------------------------//

main()

{

unsigned char d[4];



initlcd(); //lcd initialization

printlcd("Temp...",0,0);

    while(1)

    {

    cmd_lcd(0x0c); //cursor off

   

    i2c_read(0x9E,0x41,&d[0]); //read ADC RESULT from channel 0 PUT 0X44

temp=d[0]*1.953;

printnum_lcd(temp, 1, 4*0); //display on lcd

ADC0 = d[0];



    i2c_read(0x9E,0x42,&d[1]); //read ADC RESULT from channel 1 PUT 0X45

// printnum_lcd(d[1], 1, 4*1); //display on lcd

ADC1 = d[1];



    i2c_read(0x9E,0x43,&d[2]); //read ADC RESULT from channel 2 PUT 0X46

// printnum_lcd(d[2], 1, 4*2); //display on lcd

ADC2 = d[2]; 



    i2c_read(0x9E,0x44,&d[3]); //read ADC RESULT from channel 3 PUT 0X47

printnum_lcd(d[3], 1, 4*3); //display on lcd

    ADC3 = d[3];

    delay_ms(50);

}

}



//----------------------------------Ascii to decimal--------------------------------------//



void printnum_lcd(unsigned char num, unsigned char row, unsigned char col)

{

unsigned char x1, x2, dig3, dig4, dig5;

unsigned int x3;

cmd_lcd(0x80+(0x40*row)+ col);



x3=num/100;

x2=num%100;

x1=x3%100;

dig3=x1%10;

dig4=x2/10;

dig5=x2%10;



data_lcd(dig3+0x30);

data_lcd(dig4+0x30);

data_lcd(dig5+0x30);

}



//----------------------------------initialise lcd--------------------------------------//



void initlcd()

{

enable=0;

delay_ms(20);

cmd_lcd(0x30);

delay_ms(5);

cmd_lcd(0x30);

cmd_lcd(0x30);

cmd_lcd(0x38);

cmd_lcd(0x08);

CLR_LCD;

cmd_lcd(0x06);

cmd_lcd(0x0e);

}



void cmd_lcd(unsigned char command)

{

LCD_PORT=command;

regsel=0;

enable=1;

enable=0;

lcd_shortdelay();

}



void data_lcd(unsigned char databyte)

{

LCD_PORT=databyte;

regsel=1;

enable=1;

enable=0;

lcd_shortdelay();

}



void lcd_shortdelay(void)

{

unsigned char t=23;

while(t--);

}



void delay_ms(unsigned char ms)

{

unsigned char t1;

unsigned int t2;



for(t1=0; t1<ms; t1++){

for(t2=0; t2<711; t2++);

}

}



void printlcd(unsigned char *message, unsigned char row, unsigned char col)

{

   cmd_lcd(0x80 + (0x40*row) + col);

 

   for(; *message; message++)

      data_lcd(*message);

 

}