character is not displayed in LCD

[prasant]

hi everyone i m  doing project for led interface 16*2 with atmega 16 ,,   i write the code exactly which is listed in  avr series ,, but the character is not displayed in the lcd but blacklight only  on ,,, the code is below i ve copied ,, and  i m working on avr studio 4 ,, hex file is generated but when it is uploaded on mc nothing happen to the lcd ,, ????  character A is not displayed 

 

 

 

#include<avr/io.h>

#include<util/delay.h>

 

#define LCD_DATA PORTA // LCD data port

#define ctrl PORTB

#define en PB2 // enable signal

#define rw PB1 // read/write signal

#define rs PB0 // register select signal

 

void LCD_cmd(unsigned char cmd);

void init_LCD(void);

void LCD_write(unsigned char data);

 

int main()

{

DDRA=0xff; // making LCD_DATA port as output port

DDRB=0x07; // making signal as out put

init_LCD(); // initialization of LCD

_delay_ms(50); // delay of 50 milli seconds

LCD_write('A'); // call a function to write A on LCD

return 0;

}

 

void init_LCD(void)

{

LCD_cmd(0x38); // initialization of 16X2 LCD in 8bit mode

_delay_ms(1);

 

LCD_cmd(0x01); // clear LCD

_delay_ms(1);

 

LCD_cmd(0x0E); // cursor ON

_delay_ms(1);

 

LCD_cmd(0x80); // —8 go to first line and –0 is for 0th position

delay_ms(1);

return;

}

 

void LCD_cmd(unsigned char cmd)

{

LCD_DATA=cmd;

ctrl =(0<<rs)|(0<<rw)|(1<<en); // RS and RW as LOW and EN as HIGH

_delay_ms(1);

ctrl =(0<<rs)|(0<<rw)|(0<<en); // RS, RW , LOW and EN as LOW

_delay_ms(50);

return;

}

 

void LCD_write(unsigned char data)

{

LCD_DATA= data;

ctrl = (1<<rs)|(0<<rw)|(1<<en); // RW as LOW and RS, EN as HIGH

_delay_ms(1);

ctrl = (1<<rs)|(0<<rw)|(0<<en); // EN and RW as LOW and RS HIGH

_delay_ms(50); // delay to get things executed

return ;

}

 

[Vara Ashishkumar]

Hey prasant,

Are you sure for hardware connection? Please check connection of your circuit.

[Author]

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