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lcd.c
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/*
* lcd.c
*
* Created: 01-09-2018 20:44:12
* Author: soham
*/
#include <avr/io.h>
#include <util/delay.h>
#include "lcd.h"
void lcd_begin(unsigned char c,unsigned char b,unsigned char a) // dimensions ,mode
{
bit=a;
row=b;
col=c;
lcd_cd|=(1<<rs)|(1<<en)|(1<<vcc);
lcd_c|=1<<vcc;
if(bit==8)
{
lcd_dd=0xff;
lcd_ctrl(0x38); //8 bit mode
}
else
{
lcd_dd|=0x0f;
lcd_ctrl(0x33); //
lcd_ctrl(0x32); //
lcd_ctrl(0x28); //
}
lcd_ctrl(0x01); //clear
lcd_ctrl(0x06); //move l to r
lcd_ctrl(0x0C); //no cursor
lcd_ctrl(0x80); //starting address till 8f
}
void lcd_clear(void)
{
lcd_ctrl(0x01);
lcd_ctrl(0x80);
}
void lcd_setcursor(unsigned char a,unsigned char b)
{
//a is col and b is row
if(b==0)
lcd_ctrl((0x80)+a);
if(b==1)
lcd_ctrl((0xc0)+a); //add of row 1 c0 to cf
if(row==4 && col==20)
{
if(b==2)
lcd_ctrl((0x94)+a);
if(b==3)
lcd_ctrl((0xd4)+a);
}
}
void lcd_cursor(void)
{
lcd_ctrl(0x0E); //cursor on
}
void lcd_cursoroff(void)
{
lcd_ctrl(0x0C);
}
void lcd_off(void)
{
lcd_c&=~(1<<2); //vcc off
}
void lcd_on(void)
{
lcd_c|=(1<<2); //vcc on
}
void lcd_ctrl(unsigned char a)
{
lcd_c&=~(1<<rs); //rs 0 for cmd
if(bit==8)
{
lcd_d=a;
lcd_c|=1<<en;
_delay_ms(5);
lcd_c&=~(1<<en); //en 1 to 0
}
else
{
lcd_d=(lcd_d & 0x0f)|(a & 0xf0);
//lcd_d=a;
lcd_c|=1<<en;
_delay_ms(10);
lcd_c&=~(1<<en);
a=a<<4;
lcd_d=(lcd_d & 0x0f)|(a & 0xf0);;
//lcd_d=a;
lcd_c|=1<<en;
_delay_ms(5);
lcd_c&=~(1<<en);
}
}
void lcd_print(unsigned char *b)
{
lcd_c|=1<<rs; //rs 1 for data
if(bit==8)
{
while(*b !='\0')
{
lcd_d=*b;
lcd_c|=1<<en;
_delay_ms(5);
lcd_c&=~(1<<en);
*b++;
}
}
else
{
while(*b !='\0')
{
//lcd_d=*b;
lcd_d=(lcd_d & 0x0f)|(*b & 0xf0);
lcd_c|=1<<en;
_delay_ms(5);
lcd_c&=~(1<<en);
*b=*b<<4;
lcd_d=(lcd_d & 0x0f)|(*b & 0xf0);
lcd_c|=1<<en;
_delay_ms(5);
lcd_c&=~(1<<en);
*b++;
}
}
}
void lcd_printa(unsigned char q) //ascii value directly
{
lcd_c|=1<<rs;
if(bit==8)
{
lcd_d=q;
lcd_c|=1<<en;
_delay_ms(5);
lcd_c&=~(1<<en);
}
else
{
lcd_d=(lcd_d & 0x0f)|(q & 0xf0);
//lcd_d=q;
lcd_c|=1<<en;
_delay_ms(5);
lcd_c&=~(1<<en);
q=q<<4;
lcd_d=(lcd_d & 0x0f)|(q & 0xf0);
//lcd_d=q;
lcd_c|=1<<en;
_delay_ms(5);
lcd_c&=~(1<<en);
}
}