Difference between revisions of "Lcd text"

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−
=='''2 row lcd'''==
+
== 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 ;)  
 
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 ;)  
Line 6: Line 6:
 
Here is video how does it look like:
 
Here is video how does it look like:
 
http://www.youtube.com/watch?v=i1tZwHCo_g4
 
http://www.youtube.com/watch?v=i1tZwHCo_g4
 +
<youtube width="320" height="240" align="left">i1tZwHCo_g4</youtube>
 +
<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
  
−
and here is source code:
+
== Schematics ==
  
−
----
 
  
−
#define F_CPU 1000000UL
+
[[Image:Lcd.png|400px|Schematics]]
−
#include <util/delay.h>
 
−
#include <avr/io.h>
 
  
−
void bf();
+
== Source ==
  
−
void in_d()
+
<enscript lang=c>
−
{
+
#define F_CPU 1000000UL
−
DDRD = 0x00;
+
#include <util/delay.h>
−
}
+
#include <avr/io.h>
−
void out_d()
+
 
−
{
+
void bf();
−
DDRD = 0xff;
+
 
−
}
+
 
−
void in_c()
+
void in_d()
−
{
+
{
 +
DDRD = 0x00;
 +
}
 +
 
 +
void out_d()
 +
{
 +
DDRD = 0xff;
 +
}
 +
 
 +
void in_c()
 +
{
 
DDRC = 0x00;
 
DDRC = 0x00;
−
}
+
}
−
void out_c()
+
 
−
{
+
void out_c()
 +
{
 
DDRC = 0xff;
 
DDRC = 0xff;
−
}
+
}
−
write_i()
+
 
−
{
+
write_i()
 +
{
 
PORTC = 4;
 
PORTC = 4;
 
PORTC = 0;
 
PORTC = 0;
−
}
+
}
−
read_bf()
+
 
−
{
+
read_bf()
−
// PORTC = 4;
+
{
 +
// PORTC = 4;
 
PORTC = 6;
 
PORTC = 6;
−
}
+
}
−
write_d()
+
 
−
{
+
write_d()
 +
{
 
PORTC = 5;
 
PORTC = 5;
 
PORTC = 1;
 
PORTC = 1;
−
}
+
}
−
read_d()
+
 
−
{
+
read_d()
−
// PORTC = 4;
+
{
 +
// PORTC = 4;
 
PORTC = 7;
 
PORTC = 7;
−
}
+
}
−
clear()
+
 
−
{
+
clear()
 +
{
 
PORTD = 1;  // clear display
 
PORTD = 1;  // clear display
 
write_i();
 
write_i();
 
bf();
 
bf();
 +
 
PORTD = 0b00000110;  // entry mode  
 
PORTD = 0b00000110;  // entry mode  
 
write_d();
 
write_d();
 
bf();
 
bf();
 +
 
_delay_ms(100);
 
_delay_ms(100);
−
}
+
}
  
  
−
void init(void)
+
void init(void)
−
{
+
{
 
out_d();
 
out_d();
 
out_c();
 
out_c();
 +
 +
 
_delay_ms(15);
 
_delay_ms(15);
 
PORTD = 0b00110000;  // function set ( DL, N, F )
 
PORTD = 0b00110000;  // function set ( DL, N, F )
 
write_i();
 
write_i();
−
_delay_ms(4.1);
+
 
 +
_delay_ms(4.1);
 
PORTD = 0b00110000; // function set ( DL,N,F )
 
PORTD = 0b00110000; // function set ( DL,N,F )
 
write_i();
 
write_i();
−
_delay_us(100);
+
 
 +
_delay_us(100);
 
PORTD = 0b00110000;  // function set ( DL,N,F )
 
PORTD = 0b00110000;  // function set ( DL,N,F )
 
write_i();
 
write_i();
−
_delay_ms(4.1);
+
 
 +
_delay_ms(4.1);
 
PORTD = 0b00111000;  // set N and F
 
PORTD = 0b00111000;  // set N and F
 
write_i();
 
write_i();
−
_delay_ms(4.1);
+
 +
_delay_ms(4.1);
 
PORTD = 0b00001000;  // display off
 
PORTD = 0b00001000;  // display off
 
write_i();
 
write_i();
−
_delay_ms(4.1);
+
 
 +
_delay_ms(4.1);
 
PORTD = 0b00001100;  // display on
 
PORTD = 0b00001100;  // display on
 
write_i();
 
write_i();
−
_delay_ms(4.1);
+
 
 +
_delay_ms(4.1);
 
PORTD = 0b00000110;  // entry mode  
 
PORTD = 0b00000110;  // entry mode  
 
write_i();
 
write_i();
−
}
 
  
−
void bf()
 
  
−
{
+
}
  
 +
void bf()
 +
{
 
unsigned int bf;
 
unsigned int bf;
−
 
 
DDRB=0xff;
 
DDRB=0xff;
  
Line 103: Line 127:
  
 
read_bf();
 
read_bf();
−
 
 
bf = PORTD;
 
bf = PORTD;
−
 
 
bf &= 0b10000000;
 
bf &= 0b10000000;
  
−
+
while(bf) {
−
while(bf) {
 
−
 
 
 
read_bf();
 
read_bf();
−
 
 
bf = PORTD;
 
bf = PORTD;
−
 
 
bf &= 0b10000000;
 
bf &= 0b10000000;
−
 
 
PORTB=0xff;
 
PORTB=0xff;
−
 
 
_delay_ms(100);
 
_delay_ms(100);
−
 
 
PORTB=0x0;
 
PORTB=0x0;
−
 
 
_delay_ms(50);
 
_delay_ms(50);
−
 
 
}
 
}
  
Line 130: Line 143:
  
  
−
}
+
}
−
 
 
−
void left()
 
−
 
 
−
{
 
  
 +
void left()
 +
{
  
 
PORTD = 0x18;
 
PORTD = 0x18;
−
 
 
write_i();
 
write_i();
−
 
 
bf();
 
bf();
 +
}
  
−
}
 
−
 
−
 
−
int main()
 
−
 
−
{
 
  
 +
int main()
 +
{
 
unsigned int i;
 
unsigned int i;
  
 
init();
 
init();
−
 
 
_delay_ms(11);
 
_delay_ms(11);
  
 
clear();
 
clear();
−
 
 
bf();
 
bf();
  
 
while(1) {
 
while(1) {
  
−
+
PORTD = 0x23; // #
−
 
 
−
PORTD = 0x23; // #
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
 
 
−
+
PORTD = 101;  // e
−
 
 
−
PORTD = 101;  // e
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
  
−
+
PORTD = 108; // l
−
 
 
−
PORTD = 108; // l
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
  
−
+
PORTD = 101; // e
−
 
 
−
PORTD = 101; // e
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
  
−
+
PORTD = 99; // c
−
 
 
−
PORTD = 99; // c
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
  
−
+
PORTD = 116; // t
−
 
 
−
PORTD = 116; // t
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
 
 
 
 
−
+
PORTD = 114; // r
−
 
 
−
PORTD = 114; // r
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
  
  
−
+
PORTD = 111; // o
−
 
 
−
PORTD = 111; // o
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
+
−
 
 
−
 
 
PORTD = 110; // n
 
PORTD = 110; // n
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
 
 
−
+
PORTD = 105;  // i
−
 
 
−
PORTD = 105;  // i
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
  
−
+
PORTD = 99;  // c
−
 
 
−
PORTD = 99;  // c
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
  
−
+
PORTD = 115;  // s
−
 
 
−
PORTD = 115;  // s
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
  
−
+
PORTD = 0x20;  // " "
−
 
 
−
PORTD = 0x20;  // " "
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
PORTD = 0x28;  // (
 
PORTD = 0x28;  // (
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
  
−
+
PORTD = 97;  // a
−
 
 
−
PORTD = 97;  // a
 
−
 
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
PORTD = 116;  // t
 
PORTD = 116;  // t
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 0x29; // )
 
PORTD = 0x29; // )
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 0x20; // " "
 
PORTD = 0x20; // " "
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 0x49; // I
 
PORTD = 0x49; // I
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 82; // R
 
PORTD = 82; // R
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 67; // C
 
PORTD = 67; // C
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 78; // N
 
PORTD = 78; // N
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 101; // e
 
PORTD = 101; // e
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 116; // t
 
PORTD = 116; // t
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 0x20; // " "
 
PORTD = 0x20; // " "
−
 
 
write_d();
 
write_d();
−
 
 
bf();
 
bf();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 114; // r
 
PORTD = 114; // r
−
 
 
write_d();
 
write_d();
−
 
 
bf();  
 
bf();  
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 117; // u
 
PORTD = 117; // u
−
 
 
write_d();
 
write_d();
−
 
 
bf();  
 
bf();  
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 108; // l
 
PORTD = 108; // l
−
 
 
write_d();
 
write_d();
−
 
 
bf();  
 
bf();  
−
 
 
_delay_ms(500);
 
_delay_ms(500);
−
 
−
 
  
 
left();
 
left();
−
 
 
PORTD = 101; // e
 
PORTD = 101; // e
−
 
 
write_d();
 
write_d();
−
 
 
bf();  
 
bf();  
−
 
 
_delay_ms(1000);
 
_delay_ms(1000);
  
Line 483: Line 329:
  
 
clear();
 
clear();
−
 
 
_delay_ms(500);
 
_delay_ms(500);
  
 
}
 
}
−
 
 
return 0;
 
return 0;
 +
}
  
−
}
+
</enscript>

Latest revision as of 01:23, 11 March 2010

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>

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