Lcd text

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Introduction

Hello fellows, i've finally decided to write little bit on this wiki page. So, what i'll be writing about ? For last few days i was playing with little lcd display and i finally managed to write some text with it ;) The lcd has HD44780 hitachi chip.

Here is video how does it look like: http://www.youtube.com/watch?v=i1tZwHCo_g4 <youtube width="320" height="240" align="left">i1tZwHCo_g4</youtube>













Schematics

Schematics

Source

<enscript lang=c>

  1. define F_CPU 1000000UL
  2. include <util/delay.h>
  3. include <avr/io.h>

void bf();


void in_d() { DDRD = 0x00; }

void out_d() { DDRD = 0xff; }

void in_c() { DDRC = 0x00; }

void out_c() { DDRC = 0xff; }

write_i() { PORTC = 4; PORTC = 0; }

read_bf() { // PORTC = 4; PORTC = 6; }

write_d() { PORTC = 5; PORTC = 1; }

read_d() { // PORTC = 4; PORTC = 7; }

clear() { PORTD = 1; // clear display write_i(); bf();

PORTD = 0b00000110; // entry mode write_d(); bf();

_delay_ms(100); }


void init(void) { out_d(); out_c();


_delay_ms(15); PORTD = 0b00110000; // function set ( DL, N, F ) write_i();

_delay_ms(4.1); PORTD = 0b00110000; // function set ( DL,N,F ) write_i();

_delay_us(100); PORTD = 0b00110000; // function set ( DL,N,F ) write_i();

_delay_ms(4.1); PORTD = 0b00111000; // set N and F write_i();

_delay_ms(4.1); PORTD = 0b00001000; // display off write_i();

_delay_ms(4.1); PORTD = 0b00001100; // display on write_i();

_delay_ms(4.1); PORTD = 0b00000110; // entry mode write_i();


}

void bf() { unsigned int bf; DDRB=0xff;

in_d();

read_bf(); bf = PORTD; bf &= 0b10000000;

while(bf) { read_bf(); bf = PORTD; bf &= 0b10000000; PORTB=0xff; _delay_ms(100); PORTB=0x0; _delay_ms(50); }

out_d();


}

void left() {

PORTD = 0x18; write_i(); bf(); }


int main() { unsigned int i;

init(); _delay_ms(11);

clear(); bf();

while(1) {

PORTD = 0x23; // # write_d(); bf(); _delay_ms(500);

PORTD = 101; // e write_d(); bf(); _delay_ms(500);

PORTD = 108; // l write_d(); bf(); _delay_ms(500);

PORTD = 101; // e write_d(); bf(); _delay_ms(500);

PORTD = 99; // c write_d(); bf(); _delay_ms(500);

PORTD = 116; // t write_d(); bf(); _delay_ms(500);


PORTD = 114; // r write_d(); bf(); _delay_ms(500);


PORTD = 111; // o write_d(); bf(); _delay_ms(500);

PORTD = 110; // n write_d(); bf(); _delay_ms(500);

PORTD = 105; // i write_d(); bf(); _delay_ms(500);

PORTD = 99; // c write_d(); bf(); _delay_ms(500);

PORTD = 115; // s write_d(); bf(); _delay_ms(500);

PORTD = 0x20; // " " write_d(); bf(); _delay_ms(500);

PORTD = 0x28; // ( write_d(); bf(); _delay_ms(500);

PORTD = 97; // a write_d(); bf(); _delay_ms(500);

PORTD = 116; // t write_d(); bf(); _delay_ms(500);

left(); PORTD = 0x29; // ) write_d(); bf(); _delay_ms(500);

left(); PORTD = 0x20; // " " write_d(); bf(); _delay_ms(500);

left(); PORTD = 0x49; // I write_d(); bf(); _delay_ms(500);

left(); PORTD = 82; // R write_d(); bf(); _delay_ms(500);

left(); PORTD = 67; // C write_d(); bf(); _delay_ms(500);

left(); PORTD = 78; // N write_d(); bf(); _delay_ms(500);

left(); PORTD = 101; // e write_d(); bf(); _delay_ms(500);

left(); PORTD = 116; // t write_d(); bf(); _delay_ms(500);

left(); PORTD = 0x20; // " " write_d(); bf(); _delay_ms(500);

left(); PORTD = 114; // r write_d(); bf(); _delay_ms(500);

left(); PORTD = 117; // u write_d(); bf(); _delay_ms(500);

left(); PORTD = 108; // l write_d(); bf(); _delay_ms(500);

left(); PORTD = 101; // e write_d(); bf(); _delay_ms(1000);


clear(); _delay_ms(500);

} return 0; }

</enscript>