lcd.h

/*
 *	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):
 *
 *	PORT bits 0-3 are connected to the LCD data bits 4-7 (high nibble)
 *	PORT bit 4 is connected to the LCD RS input (register select)
 *	PORT bit 5 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.
 */

#include  <htc.h>
#ifndef	_XTAL_FREQ   						// 4Mhz
#define _XTAL_FREQ 4000000
#endif

//#define	LCD_RS RB4
#define	LCD_RS RA4

//#define LCD_EN RB5
#define LCD_EN RA7

#define LCD_DATA	PORTA  						//Define a porta de dados a ser usada, bits 0,1,2,3

#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,unsigned char d)	//alterei para + uma variavel no write
{
	__delay_us(40);
	LCD_DATA = ( ( c >> 4 ) & 0x0F | d  );  	//Alterei incluindo o "or d" para ligar o bit RA6 RS
	LCD_STROBE();
	LCD_DATA = ( c & 0x0F | d );				//Alterei incluindo o "or d" para ligar o bit RA6 RS
	LCD_STROBE();
}

 /* 	Clear and home the LCD */
void lcd_clear(void)
{
	LCD_RS = 0;									//
	lcd_write(0x1,0x00);  						// Alterei para + uma variavel no write
	__delay_ms(2);
}

/* write a string of chars to the LCD */
void lcd_puts(const char * s)   // * é um sinalisador de pointer  *s s pointer
{
	LCD_RS = 1;				// write characters
	while(*s)
	lcd_write(*s++,0x10);  	//alterei para + uma variavel no write/ bit RB6 nescesario para escrita
}

/* write one character to the LCD */
void lcd_putch(char c)
{
	LCD_RS = 1;	// write characters
	lcd_write( c,0x10 );  	//alterei para + uma variavel no write
}

/* Go to the specified position */
void lcd_goto(unsigned char pos)
{
	LCD_RS = 0;
	lcd_write(0x80+pos,0x00);  //alterei para + uma variavel no write
}

/* initialise the LCD - put into 4 bit mode */
void lcd_init()
{
	char init_value;
//	CMCON = 0x07;			// Disable analog pins on PORTA 16F628A
//	TRISB = 0b01000000;

	init_value = 0x3;
	LCD_RS = 0;
	LCD_EN = 0;

	__delay_ms(15);			// wait 15mSec after power applied,
	LCD_DATA	 = init_value;
	LCD_STROBE();
	__delay_ms(5);
	LCD_STROBE();
	__delay_us(200);
	LCD_STROBE();
	__delay_us(200);
	LCD_DATA = 2;			// Four bit mode
	LCD_STROBE();

	lcd_write(0x28,0x00); 	// Set interface length  //alterei para + uma variavel no write
	lcd_write(0xC,0x00); 	// Display On, CURSOR OFF, Cursor Blink  //alterei para + uma variavel no write
	lcd_clear();			// Clear screen
	lcd_write(0x6,0x00); 	// Set entry Mode  //alterei para + uma variavel no write
}