Check you lcd. Maybe it is defective. All you have to do is increase delays in LCD initialization routine. Increase _delay_ms(150) to _delay_ms(300); If it still doesn't work then buy a new LCD.
LCD 8 bit 2 Control pins. RW should be connected to ground.
| Code C - [expand] |
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| #include <avr/io.h>
#include <util/delay.h>
//Mention Clock frequency here
#define _XTAL_FREQ 8000000
// structure to allow bit field operations, name conversions: PORTA.0 -> PORT_A.b0 PORTB.7 -> PORT_B.b7
typedef struct{ uint8_t b0:1;
uint8_t b1:1;
uint8_t b2:1;
uint8_t b3:1;
uint8_t b4:1;
uint8_t b5:1;
uint8_t b6:1;
uint8_t b7:1; } bits;
// define all the ports of your microcontroller, add more ports depending on the available mcu ports
#define PORT_A (* (volatile bits *) &PORTA)
#define PIN_A (* (volatile bits *) &PINA)
#define DDR_A (* (volatile bits *) &DDRA)
#define PORT_B (* (volatile bits *) &PORTB)
#define PIN_B (* (volatile bits *) &PINB)
#define DDR_B (* (volatile bits *) &DDRB)
#define lcd_data_pin PORTD
#define en PORT_A.b0
#define rs PORT_A.b1
//#define rw PORT_A.b2
void lcd_init();
void lcd_data(unsigned char data1);
void lcd_cmd(unsigned char cmd);
void lcd_control(unsigned char cmdordata);
void lcd_string(unsigned char *str);
void lcd_init(){
lcd_cmd(0x38);
_delay_ms(150);
lcd_cmd(0x0E);
_delay_ms(150);
lcd_cmd(0x01);
_delay_ms(150);
lcd_cmd(0x06);
_delay_ms(150);
lcd_cmd(0x0C);
_delay_ms(150);
lcd_cmd(0x80);
}
void lcd_data(unsigned char data1)
{
lcd_data_pin = data1;
lcd_control(2);
}
void lcd_cmd(unsigned char cmd){
lcd_data_pin = cmd;
lcd_control(1);
}
void lcd_control(unsigned char cmdordata){
if(cmdordata == 1){
rs=0;
//rw=0;
en=1;
_delay_ms(5);
en=0;
}
else if(cmdordata == 2){
rs=1;
//rw=0;
en=1;
_delay_ms(5);
en=0;
}
}
void lcd_string(unsigned char *str){
while(*str){
lcd_data(*str++);
}
}
unsigned char msg[20] = "Working?";
int main(){
DDRA = 0xFF;
DDRD = 0xFF;
PORTA = 0x00;
PORTD = 0x00;
lcd_init();
lcd_data('A');
lcd_cmd(0xC0);
lcd_string(msg);
while(1){
;
}
return (0);
} |