houch pouch value of adc0808

[swyam prakash singh]

sir please resolve my error where my logic is getting wrong

i m interfacing adc 0808  in intereupt mode with at89c51 with lcd 16*2 in 4 bit method

but the error i m getting is houch pouch value between 000 to 255;

these 2 positon are correct and other are houch pouch

i have simulated on proteus now to check only and the result are on proteus;

mine code is written in  c

code is

#include<reg51.h>
#define ADC P1
#define LCD P2
unsigned int adc_val[7];
sbit a=P3^0;
sbit b=P3^1;
sbit c=P3^2;
sbit ale=P3^3;
sbit  sc=P3^4;
sbit eoc=P3^5;
sbit oe=P3^6;
sbit clk=P3^7;
sbit rs=P2^0;
sbit rw=P2^1;
sbit en=P2^2;
sbit sw=P2^3;
sbit flag=P2^7;
void timerdelay()  interrupt 3
{
 clk=~clk;
}
void delay(int x)
{
 unsigned int i,j;
 for(i=0;i<127;i++)
 for(j=0;j<x;j++);
}

void cmd(unsigned int x)
{
 unsigned int temp1 ,temp2;

 temp1=x;
 temp1=temp1&0xf0;
 LCD=temp1;
 rs=0;rw=0;en=1;en=0;
delay(1);
temp2=x;
temp2=temp2<<4;
temp2=temp2&0xf0;
 LCD=temp2;
 rs=0;rw=0;en=1;en=0;
}

 
void dat(unsigned int x)
{
 unsigned int temp1 ,temp2;
 
 temp1=x;
 temp1=temp1&0xf0;
 LCD=temp1;
 rs=1;rw=0;en=1;en=0;
 delay(1);
temp2=x;
temp2=temp2<<4;
temp2=temp2&0xf0;
 LCD=temp2;
 rs=1;rw=0;en=1;en=0;
}
void init()
{
 cmd(0x28);
 cmd(0x01);
 cmd(0x06);
 cmd(0x0e);
}

void lcdstring(unsigned char *string)
{while(*string!=’’)
 dat(*string++);
}

 
void bin2dec(unsigned int x)
{
 
 dat(((x/100)%10)|0x30);
  dat(((x/10)%10)|0x30);
  dat(((x/1)%10)|0x30);
}
void adc(unsigned int x)
{

 
 
if(x==0)
{
 

 {
 cmd(0x80);
  lcdstring(“SN1”);
 a=0;b=0;c=0;
    ale=1;
    sc=1;
    sc=0;
    ale=0;
    while(eoc);
    oe=1;
  adc_val[0]=ADC;oe=0;
 cmd(0xc0);
 bin2dec(adc_val[0]); 
}
}
 if(x==1)
 {
 
  
  {
  cmd(0x80);
 lcdstring(“SN2”);
  
  a=1;b=0;c=0;
    ale=1;
    sc=1;
    sc=0;
    ale=0;
    while(eoc);
    oe=1;
  adc_val[1]=ADC;
  oe=0;
  cmd(0xc0);
bin2dec(adc_val[1]); 
 }
}
 if(x==2)
 {

  {
  cmd(0x80);
  lcdstring(“SN3”);
 a=0;b=1;c=0;
    ale=1;
    sc=1;
    sc=0;
    ale=0;
    while(eoc);
    oe=1;
  adc_val[2]=ADC;oe=0;cmd(0xc0);
 bin2dec(adc_val[2]); 
  }
 }

 if(x=)
 {

  {
  cmd(0x80);
  lcdstring(“SN4”);
  a=1;b=1;c=0;
    ale=1;
    sc=1;
    sc=0;
    ale=0;
    while(eoc);
    oe=1;
 adc_val[3]=ADC;oe=0;cmd(0xc0);
 bin2dec(adc_val[3]); 
}
 
}
if(x==4)
{
 
 
 {
 
  cmd(0x80);
  lcdstring(“SN5”);
  a=0;b=0;c=1;
    ale=1;
    sc=1;
    sc=0;
    ale=0;
    while(eoc);
    oe=1;
  adc_val[4]=ADC;oe=0;cmd(0xc0);
 bin2dec(adc_val[4]); 
}
 
if(x==5)
{
 
 {
 
  lcdstring(“SN6”);
 a=1;b=0;c=1;
    sc=1;
    sc=0;
    ale=0;
    while(eoc);
    oe=1;
  adc_val[5]=ADC;oe=0;cmd(0xc0);
 bin2dec(adc_val[5]); 
}
}
  
if(x==6)
{
 

 {

  cmd(0x80);
  lcdstring(“SN7”);
    a=0;b=1;c=1;
    sc=1;
    sc=0;
    ale=0;
    while(eoc);
    oe=1;
  adc_val[6]=ADC;oe=0;cmd(0xc0);
 bin2dec(adc_val[6]); 
}
}

if(x==7)
{

 {

  cmd(0x80);
 lcdstring(“SN8”);
 
    a=1;b=1;c=1;
    sc=1;
    sc=0;
    ale=0;
    while(eoc);
    oe=1;
  adc_val[7]=ADC; oe=0;cmd(0xc0);
 bin2dec(adc_val[7]); 

 }
} 
  
 
}
 
}

void main()
{
 
 unsigned int count; int r;
 init();
 count=0;ADC=0xff;
 ale=0;sc=0;oe=0;eoc=1;sw=1;
 TMOD=0x20;//timer 1 is used in 2 mode;
 TH1=0xfd;
 TR1=1;
 IE=0x83;
 {
  while(1)
  {
   
   
   if(sw == 0)
   {
    count++;
    r=count%8;
   }
   adc(r);
  }
 }
 
}   
  
  

[Ashutosh Bhatt]

i didnt understand your problem?

there seems to be some problems in your dat and cmd functions. check in proteus by connecting LEDs on LCD pins that whether same data is given to LCD or not? all control signals are generated as per requirements or not?

 

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