//--------------------------//  
 //   LCD Display Functions  //
//--------------------------//
 
#define clear_lcd         0x01 /* Clear Display                        */
#define return_home       0x02 /* Cursor to Home position              */
#define entry_mode        0x06 /* Normal entry mode                    */
#define entry_mode_shift  0x07 /* - with shift                         */
#define system_set_8_bit  0x38 /* 8 bit data mode 2 line ( 5x7 font )  */
#define system_set_4_bit  0x28 /* 4 bit data mode 2 line ( 5x7 font )  */
#define display_on        0x0c /* Switch ON Display                    */
#define display_off       0x08 /* Cursor plus blink                    */
#define set_dd_line1      0x80 /* Line 1 position 1                    */
#define set_dd_line2      0xC0 /* Line 2 position 1                    */
#define set_dd_ram        0x80 /* Line 1 position 1                    */
#define write_data        0x00 /* With RS = 1                          */
#define cursor_on         0x0E /* Switch Cursor ON                     */
#define cursor_off        0x0C /* Switch Cursor OFF                    */

#define LCD_NONE			0
#define LCD_RS				1
#define LCD_RW				2
#define LCD_E				4

#define LCDControl 	 portb		/* LCD data lines are on port b */
#define LCDData		 porte		/* LCD control lines are on port e */

 
 // Initialise the LCD Display
LCD_Init()
{
    	LCD_SendCTRL(clear_lcd);		
    	LCD_SendCTRL(return_home);		
    	LCD_SendCTRL(entry_mode);		
    	LCD_SendCTRL(cursor_on);		
    	LCD_SendCTRL(system_set_8_bit);	
}


// Send the Databyte to the LCD as a command 
LCD_SendCTRL(int sData)
{
	LCDControl = LCD_NONE;
	LCDData = sData;
	LCDControl = LCD_E;
	delay_ms(1);
	LCDControl =LCD_NONE; 
	delay_ms(1);
}

// Send the Databyte to the LCD as data
LCD_SendData(int sData)
{
	LCDControl = LCD_RS;
	LCDData = sData;
	LCDControl = LCD_E + LCD_RS ;
	delay_ms(1);
	LCDControl = LCD_RS;
	delay_ms(1);
}

// Set LCD to start of specific line
LCD_Line(int sData)
{
	LCD_SendCTRL( 0x80 + ( 0x40 * ( sData - 1 ) ) );
}

// Set LCD to Specific Line and Column
LCD_Pos(int iLine, int iPos)
{							// the LCD lines start at 0x00 for line 1 and 0x40 for line 2
                                    			// Take 1 from iPos and add 0x80 command value to it. (so add 0x7f)
	iPos = iPos + 0x7f;     			// first character position of each line is +0
    iLine--;    					// only add 0x40 if it is line 2
	LCD_SendCTRL( (0x40 * iLine) + iPos);		// The LCD position command is 0x80
}

// Send String to LCD at current Location
void Lprintf(const char *strData )
{
  char i;
  i = 0;
                // Check for end of string
    while( strData[i] != 0)
         {
             LCD_SendData(strData[i++]);// Display on LCD 
         }
}

// The number of digits indicates whether to write   9, 09 or 009 for a value of 9. The maximum digits is 3.
void LCD_PrintBCD(char hex, int digits)
{
	if (digits == 3)
	{ 
		if(hex > 99)
			LCD_SendData(((hex / 100) % 10) + '0');
		else
			LCD_SendData(48);
	}
    if (digits >= 2)
    {
    if(hex > 9)
        LCD_SendData(((hex / 10) % 10) + '0');
    else
		LCD_SendData(48);
    }
    LCD_SendData((hex % 10) + '0');
}   

   
//---- Show time on LCD display. HH:MM 
// currently from iHour and iMin registers
// 
void LCD_Time()
{
		LCD_PrintBCD(iHour,2);
		Lprintf(":");
		LCD_PrintBCD(iMin,2);

}	

//--- Show date on LCD display dd/mm/yy
// currently from iDay, iMon, iYear
//
void LCD_Date()
{
		LCD_PrintBCD(iDay,2);
		Lprintf("/");
		LCD_PrintBCD(iMon,2);
		Lprintf("/");
		LCD_PrintBCD(iYear,2);
}