query

[ABHINAV KUMAR]

#include<avr/io.h>

#include<util/delay.h>

void cmd(unsigned char y)

     {

        PORTB&=0x0F;

        PORTB|=(y&0XF0);

        PORTB|=0X08;

        _delay_ms(20);

       PORTB&=0XF3;

        _delay_ms(20);

    

       PORTB&=0X0F;

      PORTB|(y<<4)&0XF0);

      PORTB|=0X08;

      _delay_ms(20);

     PORTB&=0XF3;

    _delay_ms(20);

  }

 

void dat(unsigned char y)

{

    PORTB&=0X0F;

    PORTB|=(y&0XF0);

    PORTB|=0X0C;

    _delay_ms(20);

    PORTB&=0XF7;

    _delay_ms(20);

 

   PORTB&=0X0F;

   PORTB|(y<<4)&0XF0);

   PORTB|=0X0C;

   _delay_ms(20);

   PORTB&=0XF7;

   _delay_ms(20);

    }

 

void display(unsigned char z[])

{

char i=0;

while(z!=’’)

{

dat(z);

i++;

}}

void main()

{

DDRB=0XFF;

cmd(0x01);

cmd(0x02);

cmd(0x28);

cmd(0x06);

cmd(0x0c);

cmd(0x80);

display(“india”);

}

  

 

plz explain the above programm. its a 4-bit lcd program.

[Ashutosh Bhatt]

you have to read LCD operation first. read LCD interfacing tutorial. try to understand it. you yourself know what the program is doing 

[Author]

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