Difference between revisions of "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 ;) | + | 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: | 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/> | ||
| − | + | == Schematics == | |
| + | |||
| + | [[Image:Lcd.png|400px|Schematics]] | ||
| + | |||
| + | == Source == | ||
| + | |||
| + | <enscript lang=c> | ||
#define F_CPU 1000000UL | #define F_CPU 1000000UL | ||
#include <util/delay.h> | #include <util/delay.h> | ||
| Line 16: | Line 25: | ||
void in_d() | void in_d() | ||
| − | |||
{ | { | ||
| − | |||
DDRD = 0x00; | DDRD = 0x00; | ||
| − | |||
} | } | ||
void out_d() | void out_d() | ||
| − | |||
{ | { | ||
| − | |||
DDRD = 0xff; | DDRD = 0xff; | ||
| − | |||
} | } | ||
void in_c() | 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(); | ||
| Line 96: | Line 79: | ||
_delay_ms(100); | _delay_ms(100); | ||
| − | |||
} | } | ||
void init(void) | void init(void) | ||
| − | |||
{ | { | ||
| − | |||
out_d(); | out_d(); | ||
out_c(); | out_c(); | ||
| Line 140: | Line 120: | ||
void bf() | void bf() | ||
| − | |||
{ | { | ||
| − | |||
unsigned int bf; | unsigned int bf; | ||
DDRB=0xff; | DDRB=0xff; | ||
| Line 153: | Line 131: | ||
while(bf) { | while(bf) { | ||
| − | |||
read_bf(); | read_bf(); | ||
bf = PORTD; | bf = PORTD; | ||
| Line 161: | Line 138: | ||
PORTB=0x0; | PORTB=0x0; | ||
_delay_ms(50); | _delay_ms(50); | ||
| − | |||
} | } | ||
| Line 170: | Line 146: | ||
void left() | void left() | ||
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{ | { | ||
| − | |||
PORTD = 0x18; | PORTD = 0x18; | ||
write_i(); | write_i(); | ||
bf(); | bf(); | ||
| − | |||
} | } | ||
int main() | int main() | ||
| − | |||
{ | { | ||
| − | |||
unsigned int i; | unsigned int i; | ||
| Line 362: | Line 333: | ||
} | } | ||
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
Source
<enscript lang=c>
- define F_CPU 1000000UL
- include <util/delay.h>
- 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>
