LCD Character 8-bit Interface C Source Code

LCD Character 8-bit interface C sample code.

//---------------------------------------------------------
/*
8_bit_character.c
Program for writing to Newhaven Display character LCD

(c) Newhaven Display International, Inc. 

 	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.
*/
//---------------------------------------------------------
#include <at89x51.h>
//---------------------------------------------------------
/*
#define E	 P3_4;
#define D_I	 P3_0;
#define R_W	 P3_7;
*/
volatile xdata at 0xB4 char E;
volatile xdata at 0xB0 char D_I;
volatile xdata at 0xB7 char R_W;
char const text1[] = {"Newhaven Display"};
char const text2[] = {"Character LCD   "};

void Delayms(int n){
	int i;
	int j;
	for (i=0;i<n;i++)
		for (j=0;j<1000;j++)
		{;}
}

void command(char i){
	P1 = i;
	P3_0 =0;
	P3_7 =0;
	P3_4  = 1;
	Delayms(1);
    P3_4  = 0;
}
void write(char i){
	P1 = i;
	P3_0 =1;
	P3_7 =0;
	P3_4  = 1;
	Delayms(1);
	P3_4  = 0;
}

void init(){
	E = 0;
	Delayms(5);
	command(0x30);
	Delayms(100);
	command(0x30);
	Delayms(10);
	command(0x30);
	Delayms(10);
	command(0x38);
	command(0x10);
	command(0x0c);
	command(0x06);
}
void home(){
	command(0x01);
	Delayms(5);
}
void nextline(){
	command(0xc0);
}
void disp_pic(){
	int i;
	home();
	for (i=0;i<16;i++){
		write(text1[i]);
	}
	 nextline();
	 for (i=0;i<16;i++){
		write(text2[i]);
	}
}


void main(void) {
	P1=0;
	P3=0;
	while(1){
		init();
		disp_pic();
		Delayms(1000);
	}
}