/* io.c
 *
 * Copyright (c) 2003-2004 Susan Cotterell.
 * Permission to copy is granted provided that this header remains
 * intact. This software is provided with no warranties.
 *
 * Version : 1.0
 *
 * 8-Bit LCD Interface
 *
 */

/*-------------------------------------------------------------------------*/

#include <pic.h>
#include "io.h"
#include "delay.h"
          
/*-------------------------------------------------------------------------*/

#define DATA_BUS PORTB
#define RS       RA2 
#define E        RA3
#define RS_BIT   2
#define E_BIT    3

/*-------------------------------------------------------------------------*/

unsigned char tempA = 0x00;

/*-------------------------------------------------------------------------*/

void EnableLCD(void) {

    bitclr(tempA, PORTA, RS_BIT); DelayUs(1); //RS = 0
    bitset(tempA, PORTA, E_BIT); DelayUs(1);  //E = 1
    bitclr(tempA, PORTA, E_BIT); DelayUs(1);  //E = 0
}

/*-------------------------------------------------------------------------*/

void EnableLCD2(void) {

    bitset(tempA, PORTA, RS_BIT); DelayUs(1);
    bitset(tempA, PORTA, E_BIT);  DelayUs(1);
    bitclr(tempA, PORTA, E_BIT);  DelayUs(1);

}

/*-------------------------------------------------------------------------*/

void InitIO(void) {

    DATA_BUS=0x38; EnableLCD(); DelayMs(5);
    DATA_BUS=0x38; EnableLCD(); DelayUs(100);
    DATA_BUS=0x38; EnableLCD(); DelayUs(100);
    DATA_BUS=0x38; EnableLCD(); DelayUs(100);

    DATA_BUS=0x01; EnableLCD(); DelayMs(2);
    DATA_BUS=0x0d; EnableLCD(); DelayUs(40);
    DATA_BUS=0x06; EnableLCD(); DelayUs(40);
}

/*-------------------------------------------------------------------------*/

void ClearScreen(void) {

    DATA_BUS=0x01; 
	EnableLCD();               
	DelayMs(2);
}

/*-------------------------------------------------------------------------*/

void GotoXY(unsigned char r, unsigned char c) {

    DATA_BUS=0x02; EnableLCD();               
	DelayMs(2);
    for(r=r*40+c, c=0; c<r; c++) {
        DATA_BUS = 0x14;
	    EnableLCD(); 
		DelayUs(40);
    }
}

/*-------------------------------------------------------------------------*/

void PutChar(char c) {

    DATA_BUS = c; EnableLCD2(); DelayUs(40);
}

/*-------------------------------------------------------------------------*/

void PrintString(const char* s) {

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