Svenska ElektronikForumet

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 * File:   LCD_test.c
 * Author: Lars
 
 * LED_RS =RA1
 * LED_EN =RA2
 * LED_RW= Ground
 * 4-bit mode
 * RC0=LED_DB4
 * RC1=LED_DB5
 * RC2=LED_DB6
 * RC3=LED_DB7
 *
 *RC5 = Ground
 *RC6 = Ground
 *RC7 = Ground
 */

#include <htc.h> 
#include <pic16f690.h> 
#include <stdio.h>  
#include <pic.h>  


#define _XTAL_FREQ 4000000

#define	LCD_RS RA1
#define LCD_EN RA2

#define LCD_DATA PORTC

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


__CONFIG(FOSC_INTRCIO & WDTE_OFF & PWRTE_OFF & MCLRE_OFF & CP_OFF & CPD_OFF & BOREN_ON & IESO_ON & FCMEN_ON);

void lcd_init()
{
	char init_value;
     ANSEL=0x00;
    ANSELH=0x00; //disable analoga inportar på RC6,RC7, (RB4,RB5)

	init_value = 0x03;
	TRISAbits.TRISA1=0;     //output mode
    TRISAbits.TRISA2=0;     //output mode
	TRISC=0x00;             //output mode
	LCD_RS = 0;
	LCD_EN = 0;
	//Funktion set
	__delay_ms(45);	
	LCD_DATA= init_value; //PORTC=0x03=0b0000 0011
	LCD_STROBE();
	//Funktion set
	__delay_us(42);
	LCD_DATA = 0x02;
	LCD_STROBE();
	LCD_DATA = 0x08;    //F=0 Character format 5x7 dots, N=1 Display in two lines
	LCD_STROBE();
	//Funktion set
	__delay_us(42);
	LCD_DATA = 0x02;
	LCD_STROBE();
	LCD_DATA = 0x08;    //F=0 Character format XXXX dots, N=1 Display in two lines
	LCD_STROBE();

	//Display ON/OFF control
	__delay_us(42);
	LCD_DATA = 0x00;
	LCD_STROBE();
	LCD_DATA = 0x0F; //D=1 display on, C=1 cusors on, B=1 cursor position on
	LCD_STROBE();
	//Display clear
	__delay_us(42);
	LCD_DATA = 0x00;
	LCD_STROBE();
	LCD_DATA = 0x01;
	LCD_STROBE();
	//Entry mode set
	__delay_ms(2);
	LCD_DATA = 0x00;
	LCD_STROBE();
	LCD_DATA = 0x07; ///S=1 display shift on, I/D=1 increment by 1
	LCD_STROBE();
}

/* write a byte to the LCD in 4 bit mode */
void lcd_write(unsigned char c)
{
	__delay_us(40);
	LCD_DATA = ( ( c >> 4 ) & 0x0F );   // send 4 high bit
    LCD_STROBE();
	LCD_DATA = ( c & 0x0F );            // send 4 low bit
    LCD_STROBE();
}

/*
 * 	Clear and home the LCD
 */
void lcd_clear(void)
{
	LCD_RS = 0;
	lcd_write(0x1);
	__delay_ms(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(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);
}


void main(){
        lcd_init();
        lcd_goto(0x04);	
        lcd_puts("HEJ");


	for(;;);
}

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void main(){
        int v=65;
        char buffer[20];
        itoa(bufferr,v,10);
        lcd_init();
        lcd_goto(0x04);
        lcd_puts("v=" buffer);

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sprintf(buffer, "v= %d", v);
lcd_puts(buffer);

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// Skriver värdet av en byte decimalt med början på position
void LCD_PlaceByte (unsigned char position, unsigned char byte){

	if(byte / 100 != 0){
		LCD_PlaceCharacter(position, 0x30 + byte/100); 	// "0" är ASCII 0x30
		position++;
		byte -= 100 * (byte/100);		// Tar bort *100-delen ur talet
	}

	LCD_PlaceCharacter(position, 0x30 + byte/10);
	LCD_WriteCharacter(0x30 + byte % 10);

}