#define F_CPU 8000000
#include <avr/io.h>
#include <stdio.h>
#include <util/delay.h>

#define CNTR 4
#define SPE 6
#define SPIE 7

//PORT B
#define CS 2
#define COPI 3
#define CIPO 4
#define CLK 5

//PORT C
#define buttonOne 1
#define buttonTwo 2
#define buttonThree 3
#define buttonFour 4


//PORT D
#define RESET 0
volatile char operation = 0;


void initSPI(){
	PRR &= ~(1 << PRSPI);

	DDRB |= (1 << CIPO) | (1 << COPI) | (1 << CLK) | (1 << CS);
	PORTB |= (1 << CS);

	SPCR |= (1 << SPE);			//Aktiviert SPI
	SPCR |= (1 << CNTR);		//Aktiviert den 'Controler' Modus
	SPCR |= (1 << SPIE);		//SPI Interrupt Enable
	SPCR |= (1 << CPOL);		//SPI Mode 3
	SPCR |= (1 << CPHA);		//SPI Mode 3
	SPCR |= (1 << DORD);		//MSB First
	SPCR |= (1 << SPR0);		//SCK / 16 = 0.5MHz
}

void SPIsendInit(char datas){
	SPDR = datas;
	while(!(SPSR & (1 << SPIF)));
	_delay_ms(15);
}

void SPIinitDisplay(){
	SPIsendInit(0x3a);
	SPIsendInit(0x09);
	SPIsendInit(0x06);
	SPIsendInit(0x1e);
	SPIsendInit(0x39);
	SPIsendInit(0x1b);
	SPIsendInit(0x6e);
	SPIsendInit(0x57);
	SPIsendInit(0x72);
	SPIsendInit(0x38);
	SPIsendInit(0x0f);
	operation = 1;
}

void SPIsendString(unsigned char characters[]){
	int temp = strlen(characters) - 1;
	for(int s = 0; s <= temp; s++){
		SPIsend(characters[s]);
	}

}

void SPIsend(unsigned char datas){
	// Serial Write Operation

	//	Synchronizing			Lower Data				Upper Data
	//	1 1 1 1 1 R/W RS 0		D0 D1 D2 D3 0 0 0 0 	D4 D5 D6 D7 0 0 0 0

	//Um Commands zu senden muss RS eine 0 sein


	unsigned char upperData = datas;
	char lowerData = datas;
	char command = 0x1f;
	char character = 0x5f;

	upperData &= 0xf0;
	lowerData &= 0x0f;

	upperData |= (upperData >> 4);
	upperData &= (0x0f);


	SPDR = (operation == 0) ? command : character;
	while(!(SPSR & (1 << SPIF)));
	_delay_ms(10);


	SPDR = lowerData;
	while(!(SPSR & (1 << SPIF)));
	_delay_ms(10);


	SPDR = upperData;
	while(!(SPSR & (1 << SPIF)));

}




int main(){

	initSPI();

	MCUCR |= (1 << 4);

	DDRD |= (1 << RESET);
	_delay_ms(10);
	PORTD &= ~(1 << RESET);

	DDRC &= ~(1 << buttonOne) & ~(1 << buttonTwo) & (1 << buttonThree) & (1 << buttonFour);


//Reset Display

	PORTD |= (1 << RESET);
	_delay_ms(60);
	PORTD &= ~(1 << RESET);
	_delay_us(500);
	PORTD |= (1 << RESET);

	SPIinitDisplay();


	SPIsendString("Holerra");


	return 0;
}