vipin.c

Embedded Programming LCD charcter display

#include <AT89x52.h>
#include<string.h>
#include<intrins.h>

sbit RS = P1^0;
sbit RW = P1^1;
sbit E = P1^2;

void command(char);
void delay_lcd(int);
void loadcharacter(char);
void write_lcd(char);

void main()
{
char lcd_int=0x38;
char lcd_set=0x0e;
char lcd_clr=0x01;
char lcd_line1=0x80;

command(lcd_int);
delay_lcd(20);

command(lcd_set);
delay_lcd(20);

command(lcd_clr);
delay_lcd(20);

command(lcd_line1);
delay_lcd(20);

loadcharacter('w');
}

void command(char cmd)
{
P2 = cmd;
RS = 0;
RW = 0;
E = 1;
delay_lcd(1);
E = 0;
}

void loadcharacter(char c)
{
write_lcd(c);
delay_lcd(100);
}

void write_lcd(char inf)
{
P2 = inf;
RS = 1;
RW = 0;
E = 1;
delay_lcd(1);
E = 0;
}

void delay_lcd(int ms)
{
int i,j;
for(i=0;i<ms;i++)
{
for(j=0;j<102;j++)
_nop_();
}
}