hello sir i modified the 4

[prajwal]

hello sir i modified the 4 bit mode code to atmega 8. the code is like this

 

 

#include<avr/io.h>
#include<util/delay.h>
#include<inttypes.h>
 
#define rs PB0    
#define rw PB1
#define en PB2
 
void lcd_init();
void dis_cmd(char);
void dis_data(char);
void lcdcmd(char);
void lcddata(char);
 
int main(void)
{
unsigned char data0[11]=”ENGINEERS”;
unsigned char data1[10]=”GARAGE”;
 
int i=0;
DDRD=0xFF;
lcd_init();
while(data0!=’’)
{
dis_data(data0);
_delay_ms(200);
i++;
}
 
dis_cmd(0xC5);
 
i=0;
while(data1!=’’)
{
dis_data(data1);
_delay_ms(200);
i++;
}
 
while(1);
}
 
 
 
void lcd_init()    // fuction for intialize
{
dis_cmd(0x02);    // to initialize LCD in 4-bit mode.
dis_cmd(0x28);    //to initialize LCD in 2 lines, 5X7 dots and 4bit mode.
dis_cmd(0x0C);
dis_cmd(0x06);
dis_cmd(0x83);
}
 
void dis_cmd(char cmd_value)
{
char cmd_value1;
cmd_value1 = cmd_value & 0xF0;    //mask lower nibble because PA4-PA7 pins are used.
lcdcmd(cmd_value1);    // send to LCD
 
cmd_value1 = ((cmd_value<<4) & 0xF0);    //shift 4-bit and mask
lcdcmd(cmd_value1);    // send to LCD
}    
 
 
void dis_data(char data_value)
{
char data_value1;
data_value1=data_value&0xF0;
lcddata(data_value1);
 
data_value1=((data_value<<4)&0xF0);
lcddata(data_value1);
}
 
void lcdcmd(char cmdout)
{
PORTD=cmdout;
PORTD&=~(1<<rs);
PORTD&=~(1<<rw);
PORTD|=(1<<en);
_delay_ms(1);
PORTD&=~(1<<en);
}
 
void lcddata(char dataout)
{
PORTD=dataout;
PORTD|=(1<<rs);
PORTD&=~(1<<rw);
PORTD|=(1<<en);
_delay_ms(1);
PORTD&=~(1<<en);
}

 

But the lcd is not displaying anything but just black boxes are appearing on LCD first row

 

Help pls…