lcd.c

一个很好的程序希望大家会喜欢这个程序@谢谢!一个比较简单的程序

// **************************************************************
// *** 					  LCD Driver V1.0  				  	  ***
// ***          Written By P. Fletcher-Jones 9/5/01           ***
// ***                   Last MOD 9/5/01			  		  ***
// ***    Compiled with ImageCraft C compiler Version 6.21E   ***
// **************************************************************

#include "LCD.h"
#include <iom103.h>
#include <macros.h>

// ***** Define I/O pins ***** //

#define BIT7 0x80
#define BIT6 0x40
#define BIT5 0x20
#define BIT4 0x10
#define BIT3 0x08
#define BIT2 0x04
#define BIT1 0x02
#define BIT0 0x01

#if 0
// *** Set port for LCD Data Bus 8 bit mode *** //
#define LCD_OP_PORT				PORTA
#define LCD_IP_PORT				PINA
#define LCD_DIR_PORT			DDRA

// *** Set LCD Enable Port and Bit values *** //
#define LCD_EN_PORT				PORTC
#define EN_BIT					BIT7

// *** Set LCD Register Select Port and Bit values *** //
#define LCD_RS_PORT				PORTC
#define RS_BIT					BIT6

// *** Set LCD Read/Write Port and Bit values *** //
#define LCD_RW_PORT				PORTC
#define RW_BIT					BIT5
#endif

volatile unsigned char *LCD_EN_PORT = &PORTC;
volatile unsigned char *LCD_DIR_PORT = &DDRA;
volatile unsigned char *LCD_IP_PORT = &PINA;
volatile unsigned char *LCD_OP_PORT = &PORTA;
volatile unsigned char *LCD_RS_PORT = &PORTC;
volatile unsigned char *LCD_RW_PORT = &PORTC;
char LCD_EN_BIT = BIT(7);
char LCD_RS_BIT = BIT(6);
char LCD_RW_BIT = BIT(5);

#define SET_LCD_E      	        *LCD_EN_PORT |= LCD_EN_BIT
#define CLEAR_LCD_E       	    *LCD_EN_PORT &= ~LCD_EN_BIT

#define SET_LCD_DATA      	    *LCD_RS_PORT |= LCD_RS_BIT
#define SET_LCD_CMD       	    *LCD_RS_PORT &= ~LCD_RS_BIT

#define SET_LCD_READ      	    *LCD_RW_PORT |= LCD_RW_BIT
#define SET_LCD_WRITE      	    *LCD_RW_PORT &= ~LCD_RW_BIT


#define LCD_ON				0x0C   
#define LCD_CURS_ON			0x0D
#define LCD_OFF				0x08
#define LCD_HOME			0x02  
#define LCD_CLEAR			0x01
#define LCD_NEW_LINE		0xC0

#define LCD_FUNCTION_SET	0x38
#define LCD_MODE_SET		0x06








 //*****************************************************//
 // This routine will return the busy flag from the LCD //
 //*****************************************************//
 
unsigned char LCD_Busy ( void )
{

unsigned char temp;

CLEAR_LCD_E;	   				 // Disable LCD

*LCD_DIR_PORT = 0x00;			// Make I/O Port input

SET_LCD_READ;					// Set LCD to READ
SET_LCD_CMD;					// Set LCD to command

SET_LCD_E;	   				 //

asm("nop");

temp = *LCD_IP_PORT;				// Load data from port

CLEAR_LCD_E;	   				 // Disable LCD

return temp;					 // return busy flag
}






// ********************************************** //
// *** Write a control instruction to the LCD *** //
// ********************************************** //

void LCD_WriteControl (unsigned char CMD)
{
	while (LCD_Busy()& 0X80);	// Test if LCD busy

	CLEAR_LCD_E;	   			// Disable LCD

	SET_LCD_WRITE ;				// Set LCD to write
	SET_LCD_CMD;				// Set LCD to command

	*LCD_DIR_PORT = 0xFF;		// LCD port output
	
	*LCD_OP_PORT = CMD;			// Load data to port

	SET_LCD_E;	   				// Write data to LCD

	asm("nop");
	
	CLEAR_LCD_E;	   			// Disable LCD
}



// ***************************************** //
// *** Write one byte of data to the LCD *** //
// ***************************************** //

void LCD_WriteData (unsigned char Data)
{

	while (LCD_Busy() & 0X80); 		// Test if LCD Busy

	CLEAR_LCD_E;	   				// Disable LCD

	SET_LCD_WRITE ;					// Set LCD to write
	SET_LCD_DATA;					// Set LCD to data

	*LCD_DIR_PORT = 0xFF;			// LCD port output
	
	*LCD_OP_PORT = Data;				// Load data to port

	SET_LCD_E;	   				 	// Write data to LCD

	asm("nop");

	CLEAR_LCD_E;	   				 // Disable LCD
}




// ********************************* //
// *** Initialize the LCD driver *** //
// ********************************* //
	
void Init_LCD(void)
{
	LCD_WriteControl (LCD_FUNCTION_SET);
	LCD_WriteControl (LCD_OFF);
	LCD_WriteControl (LCD_CLEAR);
	LCD_WriteControl (LCD_MODE_SET);
	LCD_WriteControl (LCD_ON);
	LCD_WriteControl (LCD_HOME);
}



// ************************************************ //
// *** Clear the LCD screen (also homes cursor) *** //
// ************************************************ //
void LCD_Clear(void)
{
	LCD_WriteControl(0x01);
}


// *********************************************** //
// *** Position the LCD cursor at row 1, col 1 *** //
// *********************************************** //

void LCD_Home(void)
{
	LCD_WriteControl(0x02);
}


// ****************************************************************** //
// *** Display a single character, at the current cursor location *** //
// ****************************************************************** //

void LCD_DisplayCharacter (char Char)
{
	LCD_WriteData (Char);
}



// ********************************************************************* //
// *** Display a string at the specified row and column, using FLASH *** //
// ********************************************************************* //

void LCD_DisplayString_F (char row, char column ,const unsigned char *string)
{
	LCD_Cursor (row, column);
	while (*string)
		LCD_DisplayCharacter (*string++);
}




// ******************************************************************* //
// *** Display a string at the specified row and column, using RAM *** //
// ******************************************************************* //

void LCD_DisplayString (char row, char column ,unsigned char *string)
{
	LCD_Cursor (row, column);
	while (*string)
		LCD_DisplayCharacter (*string++);
}



// *************************************************** //
// *** Position the LCD cursor at "row", "column". *** //
// *************************************************** //
void LCD_Cursor (char row, char column)
{
	switch (row) {
		case 1: LCD_WriteControl (0x80 + column - 1); break;
		case 2: LCD_WriteControl (0xc0 + column - 1); break;
		case 3: LCD_WriteControl (0x94 + column - 1); break;
		case 4: LCD_WriteControl (0xd4 + column - 1); break;
		default: break;
	}
}





// ************************** //
// *** Turn the cursor on *** //
// ************************** //
void LCD_Cursor_On (void)
{
	LCD_WriteControl (LCD_CURS_ON);
}


// *************************** //
// *** Turn the cursor off *** //
// *************************** //
void LCD_Cursor_Off (void)
{
	LCD_WriteControl (LCD_ON);
}


// ******************** //
// *** Turn Off LCD *** //
// ******************** //

void LCD_Display_Off (void)
{
	LCD_WriteControl(LCD_OFF);
}


// ******************* //
// *** Turn On LCD *** //
// ******************* //

void LCD_Display_On (void)
{
	LCD_WriteControl(LCD_ON);
}