/****************************************************************************
 Title	:   C  file for the LCD functions (lcd.c)
 Author:    Sara Keen 
 Date:	    July/24/2006
 Software:  AVR-GCC 
 Target:    Atmega 128
 Comments:  To be used with the micro-p 4 bit LCD
*****************************************************************************/

//port A is input to LCD
//pin0= no connect
//pin1=RS
//pin2=R/W
//pin3=EN
//pin4=DB4
//pin5=DB5
//pin6=DB6
//pin7=DB7

#include <avr/io.h>
#include "lcd.h"

//LCD Variables
int init[] = {0x38, 0x38, 0x38, 0x28, 0x28, 0x88, 0x08, 0xF8, 0x08, 0x18};
int temp;
int temp2;
int clear[] = {0x08, 0x18};
int temp3;


void small_delay(void)
{
int wait;
for(wait = 0; wait < 5; wait++);
}	
	
void DELAY(void)
{ 
 volatile uint16_t time1;
 for(time1 = 0; time1 < 2000; time1++);
}
	
void lcd_init(void)
// Initializes the LCD
{
	int lcd1;

	for(lcd1 = 0; lcd1 < 10; lcd1++)
	{
	temp = init[lcd1];
	PORTA = temp;
	DELAY();
	temp = temp & 0xF0;
	PORTA = temp;
	DELAY();
	}
}
	
void lcd_clr(void)
// Clears the LCD display
{	
	int clr;

	for(clr = 0; clr < 2; clr++)
	{
	temp3 = clear[clr];
	PORTA = temp3;
	DELAY();
	temp3 = temp3 & 0xF0;
	PORTA = temp3;
	DELAY();
	}
}

int def_putc(char ch)
// Displays a character to the LCD screen
{
	//display one character on screen
	int temp;
	temp = ch & 0xF0;
	temp = temp | 0x0A;
	PORTA = temp;
	DELAY();

	temp = temp & 0xF0;
	temp = temp | 0x02;
	PORTA = temp;

	DELAY();				//send same data with enable high and then low 

	temp = (ch<<4);
	temp = temp & 0xF0;
	temp = temp | 0x0A;
	PORTA = temp;
	DELAY();

	temp = temp & 0xF0;
	temp = temp | 0x02;
	PORTA = temp;
	DELAY();	
	
	return ch;
}