/*******************************************
File: lcd.c
Description:
	Driver for an alphanumeric LCD with parallel interface. Only
	4Bit interface is supported.
 *******************************************/

/*wenn im c file änderungen vorgenommen werden ohne das das h file included wird, dann überprüft der compiler nicht ob die prototypen
vorhanden sind*/

#include "HTLStddef.h"
#include "lcd.h"
#include "lcd_constants.h"

/****************** Declaration of private funktions *******************/
void LcdOut4Bit (unsigned char aByte);
void LcdEnable(void);
TBool LcdCommand(unsigned char);
TBool LcdCheckBusy(void);
TBool LcdReadBusyFlag(void);
TBool LcdReadBusyFlag(void);
unsigned char LcdReadAddress(void);
unsigned char LcdRead4Bit(void);


/****************** Public functions ************************/

void LcdInit(void) {
	LCD_PORT_DATA	&= ~(1 << LCD_DB);
	LCD_DDR_DATA	|= (1 << LCD_DB);

	LCD_PORT_RS		&= ~(1 << LCD_RS);
	LCD_DDR_RS		|= (1 << LCD_RS);

	LCD_PORT_RW		&= ~(1 << LCD_RW);
	LCD_DDR_RW		|= (1 << LCD_RW);

	LCD_PORT_EN		&= ~(1 << LCD_EN);
	LCD_DDR_EN		|= (1 << LCD_EN);

	//zeit zum hochfahren geben
	DelayMs(LCD_BOOTUP_MS);

	// Software reset 3 times
	LcdOut4Bit(LCD_SOFT_RESET);
	DelayMs(LCD_SOFT_RESET_MS1);
	LcdOut4Bit(LCD_SOFT_RESET);
	DelayMs(LCD_SOFT_RESET_MS2);
	LcdOut4Bit(LCD_SOFT_RESET);
	DelayMs(LCD_SOFT_RESET_MS3);

	/* Set to 4 bit mode*/
	LcdOut4Bit(LCD_SET_FUNCTION | LCD_FUNCTION_4BIT);
	DelayMs(LCD_SET_4BITMODE_MS);

	/* Initialize 2 lines, 5x7 matrix */
	LcdCommand(LCD_SET_FUNCTION | LCD_FUNCTION_4BIT | LCD_FUNCTION_2LINE | LCD_FUNCTION_5X7);

	/* Initialize cursor */
	LcdCommand(LCD_SET_DISPLAY | LCD_DISPLAY_ON | LCD_CURSOR_OFF | LCD_BLINKING_OFF);

	LcdClear();
}

void LcdWriteString(char* aString) {
	unsigned int i;
	for(i = 0; aString[i] != 0; i++){
		LcdWriteChar();
	}
}

void LcdWriteChar(char aCharacter) {
	LCD_PORT_RS |= (1 << LCD_RS);
	LCD_PORT_RW &= ~(1 << LCD_RW);

	LcdOut4Bit(aCharacter);
	LcdOut4Bit(aCharacter << 4);
	LcdCheckBusy();
}

void LcdClear() {
	LcdCommand(LCD_CLEAR_DISPLAY);
	DelayMs(LCD_CLEAR_DISPLAY_MS);
}

void LcdSetPosition(unsigned char aRow, unsigned char aColum) {
	int adr;
	switch(aColum){
		case 0:
			adr = LCD_DDADR_LINE1;
			break;

		case 1:
			adr = LCD_DDADR_LINE2;
			break;

		case 2:
			adr = LCD_DDADR_LINE3;
			break;

		case 3:
			adr = LCD_DDADR_LINE4;
			break;

		default:
			return;
	}

	adr += aRow;
	LcdCommand(LCD_SET_DDADR + adr);
}

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