// in de header file staan alle function-prototypes en alle defines

// de andere commando's zorgen ervoor dat dezelfde header-file
// geen 2keer wordt geïnclude in dezelfde compilatie

#ifndef LCD_H_
#define LCD_H_


#include <system.h>

#define		E			portb.5		// enable
#define		RS			portb.4		// registery select

#define		CLR_DISP		0x01	// clear display
#define		DISP_ON			0x0C	// display on
#define		DISP_OFF		0x08	// display off
#define		CUR_HOME        0x02	// cursor naar eerste positie, set DDRAM naar adress 0
#define		CUR_OFF 		0x0C	// cursor uit
#define 	CUR_ON		    0x0E	// cursor aan
#define		CUR_ON_BLINK    0x0F	// cursor blinken
#define 	CUR_LEFT        0x10	// cursor naar links
#define		CUR_RIGHT       0x14	// cursor naar rechts
#define		CUR_UP  		0x80	// set DDRAM adress (lijn 1)
#define		CUR_DOWN		0xC0	// set DDRAM adress 2 (lijn 2)
#define		ENTER           0xC0	// set DDRAM adress 2 (lijn 2)
#define		DD_RAM_ADDR		0x80	// set DDRAM adress (lijn 1)
#define		DD_RAM_ADDR2	0xC0	// set DDRAM adress 2 (lijn 2)
//UITBREIDINGEN
#define		DISP_SHIFT_LEFT	0x18	// display shift links
#define		DISP_SHIFT_RIGHT 0x1C	// display shift rechts
#define		LINE1			0x80	// lijn 1 schrijven
#define		LINE2			0xC0	// lijn 1 schrijven


void E_Pulse(void) {
	E=1;
	delay_us(100);
	E=0;
}

//********************************************************************

// Send char to LCD
void LCDSendChar(unsigned char c) {

	unsigned char data;

	delay_ms(20);

	//get upper nibble
	data = c & 0b11110000;

	//set b3-b0
	data = data >> 4;

	//send data to LCD
	portb = data;

	//set LCD to write
	//RW=0;

	//set LCD to data mode
	RS=1;

	//toggle Enable for LCD
	E_Pulse();

	// get lower nibble
	data = c & 0b00001111;

	//send data to LCD
	portb = data;

	//set LCD to write
	//RW=0;

	//set LCD to data mode
	RS=1;

	//toggle Enable for LCD
	E_Pulse();
}

//********************************************************************

// Send command to LCD
void LCDSendCmd(unsigned char c) {

	unsigned char data;

	delay_ms(20);

	//get upper nibble
	data = c & 0b11110000;

	//set b3-b0
	data = data >> 4;

	//send data to LCD
	portb = data;

	//set LCD to write
	//RW=0;

	//set LCD to data mode
	RS=0;

	//toggle E for LCD
	E_Pulse();

	// get lower nibble
	data = c & 0b00001111;
	portb = data;

	//set LCD to write
	//RW=0;

	//set LCD to data mode
	RS=0;

	//toggle Enable for LCD
	E_Pulse();

}

//********************************************************************

void LCDSendStr(unsigned char* str) {
// string doorsturen: karakter per karakter doorsturen
	unsigned int i=0;
	while(str[i]) {
		LCDSendChar(str[i]);
		i++;
	}
}

//********************************************************************

// Init LCD  after reset
void InitLCD(void) {

	intcon 		= 0x0;			// Disable interupt
	trisb.5 	= 0;			// E pin as output
	trisb		= 0x00;			// b0-b3 as output


	RS=0;				// instructie
	delay_ms(110);		// wacht 110ms

	//onderstaande waarden geinspireerd op ASSEMBLER oefeningen vorig jaar
	LCDSendCmd(0b00100000);	// LCD-init
	delay_ms(20);			// wacht 10ms

	LCDSendCmd(0b00100000);	// LCD-init
	delay_ms(20);			// wacht 10ms

	LCDSendCmd(0b00100000);	// LCD-init
	delay_ms(20);			// wacht 10ms

	LCDSendCmd(0b00101000);	// function set
							// b4=0=dl > 4 bit interface
							// b3=0=N > display 1 line
							// b2=0=F > 5*8dots
	delay_ms(20);			// wacht 10ms

	LCDSendCmd(0b00101000);	// display control
							// b2=1 > display on
							// b1=0 > cursor on
							// b0=0 > cursor doesn't blink
	delay_ms(20);			// wacht 10ms

	LCDSendCmd(0b00000001);	// clear display
	delay_ms(20);			// wacht 10ms
}



#endif