lcd.h

LCD program for NXP89Cx61

/***************************************************************
*									LCD Library					 		      *
*					Supported hardware:	2x16 LCD			   	  		*
*					Author				:	Vijay Manohar .D	   		*
*					Date					:	13 July 2007					*
*					File Details		:	LCD API and Other Constants*  
***************************************************************/

#ifndef __LCD_H__
#define __LCD_H__

typedef unsigned char bit_8;

/*************************************
	LCD Port Configuration
**************************************/

sbit LCD_PORT = 	0x90;	//Port of MC to which LCD is Connected
sbit RS 		  = 	0xA0;			
sbit RW 		  = 	0xA1;			
sbit En 		  = 	0xA2;
sbit Flag 	  = 	0x97;	//Busy Flag	

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	LCD Command MACROS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

#define LCD_CLEAR			 	 		0x1
#define RETURN_HOME		 	 		0x2
#define DEC_CURSOR 	    	 			0x4
#define INC_CURSOR		 	 		0x6
#define DISP_OFF_CUR_OFF	 			0x8
#define DISP_OFF_CUR_ON 	 			0xA
#define DISP_ON_CUR_OFF	 	 			0xC
#define DISP_ON_CUR_BLINK 	 			0xE
#define SHIFT_CUR_LEFT 		 			0x10
#define SHIFT_CUR_RIGHT		 			0x14
#define SHIFT_DISP_LEFT		 			0x18
#define SHIFT_DISP_RIGHT	 			0x1C
#define FORCE_CURSOR_BEGIN_I_LINE	0x80
#define FORCE_CURSOR_BEGIN_II_LINE	0xC0
#define DISPLAY_MODE						0x38	//2 Lines and 5X7

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	Function Prototypes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void LCD_Init (void);			// Initialize LCD
void Busy (void);					// To monitor the Busy Bit of LCD
void Wrt_Cmd (bit_8);			// Sending Command
void Wrt_Data (bit_8);			// Sending single character
void Wrt_String (bit_8*);		// Sending String
void Wrt_Value (bit_8);			// Sending 8-bit Decimal value
void GotoXY (bit_8, bit_8);	// Bringing CuRSor to (X,Y) location X -> 1,2 and Y -> 1-16
void Delay ();
#endif