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/*
 *	LCD interface example
 *	Uses routines from delay.c
 *	This code will interface to a standard LCD controller
 *	like the Hitachi HD44780. It uses it in 4 bit mode, with
 *	the hardware connected as follows (the standard 14 pin 
 *	LCD connector is used):
 *	
 *	PORTB bits 0-3 are connected to the LCD data bits 4-7 (high nibble)
 *	PORTA bit 2 is connected to the LCD RS input (register select)
 *	PORTA bit 3 is connected to the LCD EN bit (enable)
 *	
 *	To use these routines, set up the port I/O (TRISA, TRISB) then
 *	call lcd_init(), then other routines as required.
 *
 * Copywrite Craig Lee 1998
 *	
 */

#include	<pic.h>
#include	"lcd.h"
#include	"delay.h"

#define LCD_RS	RA5	// Register select
#define LCD_EN	RB4	// Enable
#define LCD_D4 RB5	// Data bits
#define LCD_D5 RC5	// Data bits
#define LCD_D6 RC4	// Data bits
#define LCD_D7 RC3	// Data bits

#define	LCD_STROBE	((LCD_EN = 1),(LCD_EN=0))


/* write a byte to the LCD in 4 bit mode */

void
lcd_write(unsigned char c)
{
	if(c & 0x80) LCD_D7=1; else LCD_D7=0;
	if(c & 0x40) LCD_D6=1; else LCD_D6=0;
	if(c & 0x20) LCD_D5=1; else LCD_D5=0;
	if(c & 0x10) LCD_D4=1; else LCD_D4=0;
	LCD_STROBE;
	if(c & 0x08) LCD_D7=1; else LCD_D7=0;
	if(c & 0x04) LCD_D6=1; else LCD_D6=0;
	if(c & 0x02) LCD_D5=1; else LCD_D5=0;
	if(c & 0x01) LCD_D4=1; else LCD_D4=0;
	LCD_STROBE;	
	DelayUs(40);
}

/*
 * 	Clear and home the LCD
 */

void
lcd_clear(void)
{
	LCD_RS = 0;

	lcd_write(0x1);
	DelayMs(2);
}

/* write a string of chars to the LCD */

void
lcd_puts(const char * s)
{
	LCD_RS = 1;	// write characters

	while(*s) lcd_write(*s++);
}

/* write one character to the LCD */

void
lcd_putch(unsigned char c)
{
	LCD_RS = 1;	// write characters

	lcd_write(c);
}


/*
 * Go to the specified position
 */

void
lcd_goto(unsigned char pos)
{
	LCD_RS = 0;

	lcd_write(0x80 + pos);
}
	
/* initialise the LCD - put into 4 bit mode */

void
lcd_init(void)
{
	LCD_RS = 0;	// write control bytes

	DelayMs(15);// power on delay

	LCD_D4 = 1;	// init!	
	LCD_D5 = 1; //
	LCD_STROBE;	
	DelayMs(5);

	LCD_STROBE;	// init!	
	DelayUs(100);

	LCD_STROBE;	// init!	
	DelayMs(5);

	LCD_D4 = 0;	// set 4 bit mode
	LCD_STROBE;	
	DelayUs(40);
	
	lcd_write(0x28);// 4 bit mode, 1/16 duty, 5x8 font, 2lines
	lcd_write(0x0C);// display on
	lcd_write(0x06);// entry mode advance cursor
	lcd_write(0x01);// clear display and reset cursor
}


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file: /Techref/microchip/language/c/io/lcd/hitachilcd-cl/lcd_c.htm, 23KB, , updated: 2009/11/13 14:19, local time: 2017/10/23 04:59,
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