/*
 * Stektermometer.c
 *
 * Created: 2015-04-01 12:27:28
 *  Author: digpi16
 */ 


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



int currentTemp;
int goalTemp;


	void initDisplay() {
		PORTA = 0x40; //default E högt
		PORTD = 0x3C; //Function set
		PORTA = 0x00; //Ner med E
		PORTA = 0x40; //E högt
		
		_delay_ms('50');
		
		PORTD = 0x0E; //Display on/off
		PORTA = 0x00; //Ner med E
		PORTA = 0x40; //E högt
		
		_delay_ms('50');
		
		PORTD = 0x1C; //Cursor/display shift
		PORTA = 0x00; //Ner med E
		PORTA = 0x40; //E högt
	
		_delay_ms('50');
		
		clearDisplay();
	}
	
	void clearDisplay(){
		PORTA = 0x40; //default E högt
		PORTD = 0x01; //Clear display
		PORTA = 0x00; //Ner med E
		PORTA = 0x40; //E högt
		_delay_ms('150');
	}
	
	//position hex enl datablad
	void writeChar(char output, char position){ 
			PORTA = 0x40;
			PORTD = position;
			
			PORTA = 0x10;
			PORTA = 0x50;
			
			displayReady();
			PORTD = output;
			PORTA = 0x10;
			PORTA = 0x50;

	}
	
	void displayReady() {
		DDRD = 0x00;
		while(PIND==0x80) {
		}
		DDRD=0xFF;
	}
	
	void setTemp(int temp) {
		goalTemp = temp;
	}
	
	void printInitText(){
		writeChar('C', 0x80);
		writeChar('u', 0x81);
		writeChar('r', 0x82);
		writeChar('r', 0x83);
		writeChar('e', 0x84);
		writeChar('n', 0x85);
		writeChar('t', 0x86);
		writeChar(':', 0x87);
		
		writeChar(0xDF, 0x8B);
		writeChar('C', 0x8C);
		
 		writeChar('G', 0xC0);
		writeChar('o', 0xC1);
		writeChar('a', 0xC2);
		writeChar('l', 0xC3);
 		writeChar(':', 0xC4);
		
		writeChar(0xDF, 0xC8);
		writeChar('C', 0xC9);
	}
	
	void testTemp(){
		int newTemp = voltToCelc();
		if(newTemp != currentTemp) {
			currentTemp = newTemp;
			printCurrentTemp();
		}
		if((goalTemp == currentTemp) || (goalTemp < currentTemp)){
			PORTC = 0x80;
		} 
	}
	
	void printCurrentTemp(){
		char ut [2];
		sprintf(ut,"%d",currentTemp);
		writeChar(ut[0], 0x89);
		writeChar(ut[1], 0x8A);
		
	}
	
	int voltToCelc() {
		ADCSRA = 0xC0;
		while(ADCSRA==0xC0) {
			//ADCSRA blir 0x90
		}
		int rawvoltage = ADC;
		int millivolts = rawvoltage*5; //5160/1024
		int celsius= (millivolts)/10;
		return celsius;
	}
	
	int main(void)
	{
		DDRA = 0x70;
		DDRB = 0x00;
		DDRC = 0xC0;
		DDRD = 0xFF;
		ADCSRA = 0x80;
		ADMUX = 0x47;
		 
		
		initDisplay();
		printInitText();
		printCurrentTemp();

		while (1) {
			if(PINB & (1<<PB3)) { //Knapp längst upp höger (Fågel = 72)
				setTemp(72);
				writeChar('7', 0xC6);
				writeChar('2', 0xC7);
				PORTC = 0x40;	
				_delay_ms('50');	
			} else if(PINB & (1<<PB4)) { //Knapp längst ner höger (Well done = 70)
				setTemp(70);
				writeChar('7', 0xC6);
				writeChar('0', 0xC7);
				PORTC = 0x40;
				_delay_ms('50');
 			} else if(PINB & (1<<PB5)) { //Knapp vänster uppe (Fläsk = 70)
 				setTemp(70);
 				writeChar('7', 0xC6);
 				writeChar('0', 0xC7);
 				PORTC = 0x40;
				 _delay_ms('50');
 			} else if(PINB & (1<<PB6)) { // Knapp nere mitt (Medium = 60)
				setTemp(60);
				writeChar('6', 0xC6);
				writeChar('0', 0xC7);
				PORTC = 0x40;
				_delay_ms('50');
			} else if(PINB & (1<<PB7)) { // Knapp vänster nere (Rare = 55)
				setTemp(55);
				writeChar('5', 0xC6);
				writeChar('5', 0xC7);
				PORTC = 0x40;
				_delay_ms('50');
			}
			testTemp();
		}
		return 0;
	}