#include<reg51.h>
#include "delay.h"
#include "lcd.h"
 
#define databus	P2   //	LCD databus connected to PORT2
 
sbit rs= P0^0;		 // Register select pin connected to P0.0
sbit rw= P0^1;		 // Read Write pin connected to P0.1
sbit en= P0^2;		 // Enable pin connected to P0.2
 
 
/* 16x2 LCD Specification */
#define LCDMaxLines 2
#define LCDMaxChars 16
#define LineOne 0x80
#define LineTwo 0xc0
 
#define BlankSpace ' '
 
 
/*---------------------------------------------------------------------------------
                         void LCD_Init()
 ----------------------------------------------------------------------------------
 * Function name:  LCD_Init()
 * I/P Arguments: none.
 * Return value	: none
 
 * description  :This function is used to initialize the lcd in 8-bit mode
 
-----------------------------------------------------------------------------------*/
void LCD_Init()
{
    delay_us(5000);
   LCD_CmdWrite(0x38);   // LCD 2lines, 5*7 matrix
   LCD_CmdWrite(0x0E);	// Display ON cursor ON  Blinking off
   LCD_CmdWrite(0x01);	// Clear the LCD
   LCD_CmdWrite(0x80);	// Move the Cursor to First line First Position
 
}
 
 
 
 
/*---------------------------------------------------------------------------------
                         void LCD_Clear()
 ----------------------------------------------------------------------------------
 * I/P Arguments: none.
 * Return value	: none
 
 * description  :This function clears the LCD and moves the cursor to first Position
 
-----------------------------------------------------------------------------------*/
void LCD_Clear()
{
   LCD_CmdWrite(0x01);	// Clear the LCD and go to First line First Position
   LCD_CmdWrite(LineOne);
}
 
 
 
 
 
/*---------------------------------------------------------------------------------
                         void LCD_GoToLineOne()
 ----------------------------------------------------------------------------------
 * I/P Arguments: none.
 * Return value	: none
 
 * description  :This function moves the Cursor to First line First Position
 
-----------------------------------------------------------------------------------*/
void LCD_GoToLineOne()
{
   LCD_CmdWrite(LineOne);	// Move the Cursor to First line First Position
}
 
 
 
 
/*---------------------------------------------------------------------------------
                         void LCD_GoToLineTwo()
 ----------------------------------------------------------------------------------
 * I/P Arguments: none.
 * Return value	: none
 
 * description  :This function moves the Cursor to Second line First Position
 
-----------------------------------------------------------------------------------*/
void LCD_GoToLineTwo()
{
   LCD_CmdWrite(LineTwo);	// Move the Cursor to Second line First Position
}
 
 
 
 
/*---------------------------------------------------------------------------------
                         void LCD_GoToXY(char row,char col)
 ----------------------------------------------------------------------------------
 * I/P Arguments: char row,char col
                 row -> line number(line1=0, line2=1),
                        For 2line LCD the I/P argument should be either 0 or 1.
                 col -> char number.
                        For 16-char LCD the I/P argument should be betwen 0-15.
 * Return value	: none
 
 * description  :This function moves the Cursor to specified position
 
-----------------------------------------------------------------------------------*/
void LCD_GoToXY(char row, char col)
{
   char pos;
 
    if(row<LCDMaxLines)
      {
		 pos= LineOne | (row << 6); // take the line number
		                            //row0->pos=0x80  row1->pos=0xc0
 
	    if(col<LCDMaxChars)
		   pos= pos+col;            //take the char number
		                            //now pos points to the given XY pos
 
		 LCD_CmdWrite(pos);	       // Move the Cursor to specified Position
       }
}
 
 
 
 
 
 
 
/*---------------------------------------------------------------------------------
                       void LCD_CmdWrite( char cmd)
* ---------------------------------------------------------------------------------
 * I/P Arguments: 8-bit command supported by LCD.
 * Return value	: none
 
 * description :This function sends a command to LCD in the following steps.
     step1: Send the I/P command to LCD.
     step2: Select the Control Register by making RS low.
     step3: Select Write operation making RW low.
	 step4: Send a High-to-Low pulse on Enable PIN with some delay_us.
----------------------------------------------------------------------------------*/
void LCD_CmdWrite( char cmd)
{
 
   databus=cmd;        // Send the command to LCD
     rs=0;             // Select the Command Register by pulling RS LOW
     rw=0;             // Select the Write Operation  by pulling RW LOW
     en=1;             // Send a High-to-Low Pusle at Enable Pin
	delay_us(10);
     en=0;
 
   delay_ms(1);
}
 
 
 
 
 
/*---------------------------------------------------------------------------------
                       void LCD_DataWrite( char dat)
 ----------------------------------------------------------------------------------
 * I/P Arguments: ASCII value of the char to be displayed.
 * Return value	: none
 
 * description  :
    This function sends a character to be displayed on LCD in the following steps.
      step1: Send the character to LCD.
      step2: Select the Data Register by making RS high.
      step3: Select Write operation making RW low.
	  step4: Send a High-to-Low pulse on Enable PIN with some delay_us.
 
-----------------------------------------------------------------------------------*/
void LCD_DataWrite( char dat)
{
 
 
   databus=dat;	    // Send the data to LCD
     rs=1;			// Select the Data Register by pulling RS HIGH
     rw=0;			// Select the Write Operation  by pulling RW LOW
     en=1;			// Send a High-to-Low Pusle at Enable Pin
	delay_us(10);
     en=0;
 
   delay_ms(1);
 
}
 
 
 
 
 
 
/*---------------------------------------------------------------------------------
                       void LCD_DisplayString(char *string_ptr)
 ----------------------------------------------------------------------------------
 * I/P Arguments: String(Address of the string) to be displayed.
 * Return value	: none
 
 * description  :
               This function is used to display the ASCII string on the lcd.
                 1.The string_ptr points to the first char of the string
                    and traverses till the end(NULL CHAR).
                 2.Each time a char is sent to LCD_DataWrite funtion to display.
-----------------------------------------------------------------------------------*/
void LCD_DisplayString(char *string_ptr)
{
   while(*string_ptr)
    LCD_DataWrite(*string_ptr++);
	}
 
 
 
 
 
/*---------------------------------------------------------------------------------
                      void  LCD_DisplayNumber(unsigned int num)
 ----------------------------------------------------------------------------------
 * Function name:  LCD_DisplayNumber()
 * I/P Arguments: unsigned int.
 * Return value	: none
 
 * description  :This function is used to display a 5-digit integer(0-65535).
                 ex: if the number is 12345 then 12345 is displayed.
                     if the number is 123 then 00123 is displayed.
 
 
 __________Take 1 by dividing by 10000 and add 0X30 to obtain the ASCII value,
|           then take the 4-digit remainder(2345).
|
| _________Take 2 by dividing by 1000  and add 0X30 to obtain the ASCII value,
||           then take the 3-digit remainder(345)
||
|| ________Take 3 by dividing by 100   and add 0X30 to obtain the ASCII value,
|||           then take the 2-digit remainder(45).
|||
||| _______Take 4 by dividing by 10    and add 0X30 to obtain the ASCII value,
|||| ______Take 5 the remainder of 45  and add 0X30 to obtain the ASCII value,.
|||||
12345
-----------------------------------------------------------------------------------*/
void LCD_DisplayNumber(unsigned int num)
{
   LCD_DataWrite((num/10000)+0x30);
   num=num%10000;
 
   LCD_DataWrite((num/1000)+0x30);
   num=num%1000;
 
   LCD_DataWrite((num/100)+0x30);
   num=num%100;
 
   LCD_DataWrite((num/10)+0x30);
 
   LCD_DataWrite((num%10)+0x30);
 
 }
 
 
 
 
 
/*---------------------------------------------------------------------------------
                  void LCD_ScrollMessage(char *msg_ptr)
 ----------------------------------------------------------------------------------
 * I/P Arguments: char *msg_ptr
                 msg_ptr -> pointer to the string to be scrolled
 
 * Return value	: none
 
 * description  :This function scrolls the given message on the first line.
        1.16 chars are displayed at atime.
        2.Pointer is incremented to skip a char each time to give the illusion of
           moving chars
        3.If the chars are less than 16, then the BlankSpaces are displayed.
 
-----------------------------------------------------------------------------------*/
 
void LCD_ScrollMessage(char *msg_ptr)
{
  unsigned char i,j;
  LCD_CmdWrite(0x0c);			 //Disable the Cursor
  for(i=0;msg_ptr[i];i++)        //Loop to display the complete string
    {                            //each time 16 chars are displayed and
                                 //pointer is incremented to point to next char
 
      LCD_GoToLineOne();                   //Move the Cursor to first line
 
      for(j=0;j<LCDMaxChars && msg_ptr[i+j];j++) //loop to Display first 16 Chars
	    LCD_DataWrite(msg_ptr[i+j]);                 //or till Null char
 
	  for(j=j; j<LCDMaxChars; j++)               //If the chars are below 16
        LCD_DataWrite(BlankSpace);              //then display blank spaces
 
       delay_ms(125);
    }
   LCD_CmdWrite(0x0E);			  //Enable the Cursor
}
 
 
 
 
 
/*---------------------------------------------------------------------------------
                  void LCD_DisplayRtcTime(char hour,char min,char sec)
 ----------------------------------------------------------------------------------
 * I/P Arguments: char hour,char min,char sec
             hour,min,sec should be packed BCD format, as read from DS1307
 
 * Return value	: none
 
 * description  :This function display hour,min,sec read from DS1307.
 
   ___________ Display the higher nibble of hour after adding 0x30(ASCII conversion)
  |            Display the lower nibble of hour after adding 0x30(ASCII conversion)
  |
  |	  ________ Display the higher nibble of min after adding 0x30(ASCII conversion)
  |	 |     	   Display the lower nibble of min after adding 0x30(ASCII conversion)
  |	 |
  |	 |	 _____ Display the higher nibble of sec after adding 0x30(ASCII conversion)
  |	 |	|      Display the lower nibble of sec after adding 0x30(ASCII conversion)
  |	 |	|
  10;10;40
 
-----------------------------------------------------------------------------------*/
void LCD_DisplayRtcTime(char hour,char min,char sec)
{
    LCD_DataWrite(((hour>>4) & 0x0f) + 0x30);
    LCD_DataWrite((hour & 0x0f) + 0x30);
    LCD_DataWrite(':');
 
    LCD_DataWrite(((min>>4) & 0x0f) + 0x30);
	LCD_DataWrite((min & 0x0f) + 0x30);
    LCD_DataWrite(':');
 
    LCD_DataWrite(((sec>>4) & 0x0f) + 0x30);
	LCD_DataWrite((sec & 0x0f) + 0x30);
 
 }
 
 
 
 
 
 
/*---------------------------------------------------------------------------------
                  LCD_DisplayRtcDate(char day,char month,char year)
 ----------------------------------------------------------------------------------
 * I/P Arguments: char day,char month,char year
             day,month,year should be packed BCD format, as read from DS1307
 
 * Return value	: none
 
 * description  :This function display day,month,year read from DS1307.
 
   ___________ Display the higher nibble of day after adding 0x30(ASCII conversion)
  |            Display the lower nibble of day after adding 0x30(ASCII conversion)
  |
  |   ________ Display the higher nibble of month after adding 0x30(ASCII conversion)
  |  |         Display the lower nibble of month after adding 0x30(ASCII conversion)
  |  |
  |  |	 _____ Display the higher nibble of year after adding 0x30(ASCII conversion)
  |  |	|      Display the lower nibble of year after adding 0x30(ASCII conversion)
  |  |	|
  01/01/12 (1st-Jan 2012)
 
-----------------------------------------------------------------------------------*/
void LCD_DisplayRtcDate(char day,char month,char year)
 {
     LCD_DataWrite(((day>>4) & 0x0f) + 0x30);
     LCD_DataWrite((day & 0x0f) + 0x30);
     LCD_DataWrite('/');
 
     LCD_DataWrite(((month>>4) & 0x0f) + 0x30);
 	 LCD_DataWrite((month & 0x0f) + 0x30);
     LCD_DataWrite('/');
 
     LCD_DataWrite(((year>>4) & 0x0f) + 0x30);
 	LCD_DataWrite((year & 0x0f) + 0x30);
 
 }