[raju]

any one tell me where i mistake in code pleace see my code.

 

#include<reg51.h>
#include<stdio.h>

sbit rs=P3^7;
sbit en=P3^6;
#define port P1

void delayms(int delay);
void lcdcmd(unsigned char l);
void lcddata(unsigned char l);
void display(unsigned char *dr);
void delay(unsigned char s);
void lcd();
void enable();
void lcdint();

void enable()
{
en=0;
delay(100);
en=1;
}
void lcdcmd(unsigned char l)
{

int s;
rs=0;
s=l;
port=((l>>4)&0x0F);
enable();
delay(1000);
enable();
port=(s&0x0F);
enable();
//enable();

}

void lcddata(unsigned char l)
{
int s;
rs=1;
s=l;
port=((l>>4)&0x0F);
enable();
delay(1000);
enable();
port=(s&0x0F);
enable();
//enable();

}

void display(unsigned char *dr)
{

while(*dr)
{
lcddata(*dr++);
}
}

void delay(unsigned char s)
{
while(s–);
}
void lcd()
{
port=0xFF;
enable();
delayms(7);
port=0x30;
enable();
delayms(5);
port=0x30;
enable();
delayms(5);
port=0x30;
enable();
delayms(5);
port=0x20;
enable();
delayms(5);

}
void lcdint()
{
lcd();
lcdcmd(0x28);
delay(100);
lcdcmd(0x0C);
delay(500);
lcdcmd(0x06);
delay(500);
//lcdcmd(0x01);
delay(500);

}

void main()
{

while(1)
{

lcdint();
lcdcmd(0x80);
lcddata(‘a’);
}
}

void delayms(int delay)
{

int i ;
for(i = 0 ; i<delay ; i++)
{
TMOD=0x01;
TH0 = 0xFC ;
TL0 = 0x17 ;
TR0 = 1 ;
while(!TF0);
TR0 = 0 ;
TF0 = 0 ;
}
}

[raju]

 sir i want to  4 bit lcd display how to interface and correct coding for 4bit interface with 8051.

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