Hi to all, I am

[Anonymous]

Hi to all,

 

             I am trying to do programming for display in LCD display. The program is as below –

 

 

// Program to display a single alphabet ‘A’ on LCD 

/*

LCD data transfer through 8 bit mode

Writing a single letter A on LCD

 

LCD DATA port—-PORT A

ctrl port

---

PORT B

rs

---

PB0

rw

---

PB1

en

---

PB2

*/

 

#include<avr/io.h>

#include<util/delay.h>

#ifndef F_CPU

#define F_CPU 16000000UL

#endif

 

#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(‘B’); // call a function to write A on LCD

LCD_string();

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 ;

}

 

void LCD_string(void)

{

unsigned char str[] = “Hi This is Biswajit Manna”;

int i;

for(i=0;i<16; i++)

{

LCD_DATA = str;

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

}

if (i==16)

{

 

LCD_cmd(0xC0); // —C go to 2nd line and –0 is for 0th position

_delay_ms(1);

for (i=16;i<sizeof str;i++)

{

LCD_DATA = str;

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;

}

 

 

 

Tell me if there is anything wrong in the program. Some display is coming in the LCD but not in accordance with the string specified in the program. Yours help will be highly appreciated.