//This code is from cs122A Fall 00 except displayMessage message function

#pragma SMALL DB OE

#include <reg51.h>
#include "io.h"
          
sfr DATA_BUS = 0xa0;
sbit RS = 0xb2;
sbit E  = 0xb3;


static void EnableLCD(int t) 
{

    unsigned char i;

    E = 1; for(i=0; i<t; i++) i = i;
    E = 0; for(i=0; i<t; i++) i = i;
}

void InitIO(void) 
{

    RS=0;                                        
    DATA_BUS=0x38; EnableLCD(255);           
    DATA_BUS=0x38; EnableLCD(255);               
    DATA_BUS=0x38; EnableLCD(255);               
    DATA_BUS=0x01; EnableLCD(255);               
    DATA_BUS=0x0d; EnableLCD(255);               
    DATA_BUS=0x06; EnableLCD(255);               
    RS = 1;					 
}


void ClearScreen(void) 
{

    RS=0;                                        
    DATA_BUS=0x01; EnableLCD(255);               
    RS = 1;					 
}


void GotoXY(unsigned char r, unsigned char c) 
{

    RS=0;                                        
    DATA_BUS=0x02; EnableLCD(255);               
    for(r=r*40+c, c=0; c<r; c++)
        DATA_BUS = 0x14, EnableLCD(45);
    RS=1;
}


void PutChar(char c) 
{

    DATA_BUS = c; EnableLCD(45);
}

void PrintString(const char *s) 
{

    while( *s ) 
		DATA_BUS = *(s++), EnableLCD(45);
}


void displayMessage(unsigned char *mydata, unsigned char index)
{
	int i,j;
	ClearScreen();
	//printing first 8 chararcters
	GotoXY(0,0);
	for(i=index; i<8+index; i++)
	{
		if( mydata[i] != '\0' )
		{
			PutChar(mydata[i]);
		}
		else
		{
			break;
		}
	}
	//printing last 8 characters
	GotoXY(1,0);
	for(j=i; j<i+8; j++)
	{
		if( mydata[j] != '\0' )
		{
			PutChar(mydata[j]);
		}
		else 
		{
			break;
		}
	}

}