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/****************************************************************
File name - Zadanie_final.c 
Compiler - WinAVR / AVR GCC
Author - David Lesko
*****************************************************************/

#include<avr/io.h>
#include<util/delay.h>
#include"lcd.h"
#include<avr/interrupt.h>

#define SET_BIT(PORT,BIT) ((PORT)|=(1<<BIT))	// Function for setting specific bit
#define CLR_BIT(PORT,BIT) ((PORT)&=~(1<<BIT))	// Function	for clearing specific bit
#define ENABLE	7								// Enable macro

#define PC_PORT		PORTC	// Port C macro
#define PC_PIN1		0		// Pin C macro
#define PC_PIN2		1

#define bit(m)			((1<<m))	// Bit macro
#define bit_get(p,m)	((p) & bit(m))	// Bit selection macro
#define PIN(x)			(*(&x - 2))	// Pin macro

bool	sw1 = 0;		// Switch variable
bool	sw2 = 0;
int	s=0,secondss=0;

static volatile seconds,minutes;

void readButtons(void);		// Read buttons function
void inkrement(void);		// Incrementation of a second
void sekundy(void);			// Seconds function
void minuty(void);			// Minutes function
void short_beep(void);		// Short beep function
void long_beep(void);		// Long beep function

void short_beep(void)
{
	int	i=0;
	for(i=0;i<=200;i++)		// Short beep frequency generation
	{
		PORTD |= 0x20;
		_delay_us(200);
		PORTD &= 0xDF;
		_delay_us(200); 
	}
	_delay_ms(1000);
}

void long_beep(void)	
{
	int	i=0;
	for(i=0;i<=600;i++)		// Long beep frequency generation
	{
		PORTD |= 0x20;
		_delay_us(200);
		PORTD &= 0xDF;
		_delay_us(200); 
	}
	_delay_ms(1000);
}

ISR(TIMER1_COMPA_vect)
{
	inkrement();			// Interrupt vector is calling increment function
}

void inkrement(void)
{
	if(seconds!=60)
	{
		seconds++;		// If seconds are not 1 minute then incrementation will occur
	}
	else
	{
		minutes++;		// Incrementation of minutes variable
		seconds = 0;	// Reset of seconds variable
	}
	TCNT1=0;		// Reset TIMER1
}

void sekundy(void)
{
	switch(seconds)		// Specific seconds function
		{				// 55 to 58 is short beep, 59 long beep
			case 0:
			lcd_gotoxy(1,14);
			lcd_putstr("  ");
			break;
			case 56:
			short_beep();
			break;
			case 57:
			short_beep();
			break;
			case 58:
			short_beep();
			break;
			case 59:
			short_beep();
			break;
			case 60:
			long_beep();
			break;
		}	
}

void minuty(void)
{
	switch(minutes)		// Displaying minutes to display, up to 19 minutes is defined
		{	
			case 0:
			lcd_gotoxy(1,9);
			lcd_putstr("00");
			break;
			case 1:
			lcd_gotoxy(1,9);
			lcd_putstr("01");
			break;
			case 2:
			lcd_gotoxy(1,9);
			lcd_putstr("02");
			break;
			case 3:
			lcd_gotoxy(1,9);
			lcd_putstr("03");
			break;
			case 4:
			lcd_gotoxy(1,9);
			lcd_putstr("04");
			break;
			case 5:
			lcd_gotoxy(1,9);
			lcd_putstr("05");
			break;
			case 6:
			lcd_gotoxy(1,9);
			lcd_putstr("06");
			break;
			case 7:
			lcd_gotoxy(1,9);
			lcd_putstr("07");
			break;
			case 8:
			lcd_gotoxy(1,9);
			lcd_putstr("08");
			break;
			case 9:
			lcd_gotoxy(1,9);
			lcd_putstr("09");
			break;
			case 10:
			lcd_gotoxy(1,9);
			lcd_putstr("10");
			break;
			case 11:
			lcd_gotoxy(1,9);
			lcd_putstr("11");
			break;
			case 12:
			lcd_gotoxy(1,9);
			lcd_putstr("12");
			break;
			case 13:
			lcd_gotoxy(1,9);
			lcd_putstr("13");
			break;
			case 14:
			lcd_gotoxy(1,9);
			lcd_putstr("14");
			break;
			case 15:
			lcd_gotoxy(1,9);
			lcd_putstr("15");
			break;
			case 16:
			lcd_gotoxy(1,9);
			lcd_putstr("16");
			break;
			case 17:
			lcd_gotoxy(1,9);
			lcd_putstr("17");
			break;
			case 18:
			lcd_gotoxy(1,9);
			lcd_putstr("18");
			break;
			case 19:
			lcd_gotoxy(1,9);
			lcd_putstr("19");
			break;
		}	
}

void readButtons(void)
{
	CLR_BIT(PORTD,ENABLE);	// Clearing definition of PORTD
	DDRC = DDRC & 0xf0;		// Definition of input on PORTC
	PORTC = 0x0f;

	_delay_us(10);

	sw1 = !bit_get(PIN(PC_PORT),PC_PIN1);	// Getting boolean state of button 1
	_delay_ms(10);							// Switch bounce elimination
	
	sw2 = !bit_get(PIN(PC_PORT),PC_PIN2);	// Getting boolean state of button 2
	_delay_ms(10);	

	DDRC = DDRC|0x0f;		// Returning the DDRC to previous state of outputs
}

int	main()
{
	int	tl=0;

	lcd_init();				// Initialisation of display
	LCD_initialise();

	lcd_gotoxy(1,9);		// Sending ready string to display
	lcd_putstr("--");

	DDRD |= (1<<DDD5);		// Initialisation of Buzzer

	TCCR1A = 0;						// Normal Mode Timer1
	TCCR1B = (1<<CS12)|(1<<CS10);	// Prescaler 1024
	TCNT1 = 0;						// Start count from 0
	OCR1A = 15625;					// 1 second

	TIFR1 = (1<<OCF1A);		// Clear Pending Interrupt
	TIMSK1 = 0;				// Disable Compare A Interrupt

	sei();		// Enable global interrupts
	
	while(1) // Loop forever
	{
		lcd_gotoxy(0,0);		// Timer errors in DRAM compensation
	    lcd_putstr(" O");
		readButtons();			// Reading button state

		if(sw1 && tl==0){	// Button Start pressed
			tl=1;			// Double button tick elimination
			TCNT1 = 0;		// Timer count reset
			TIMSK1 = (1<<OCIE1A);	// Enable Compare A Interrupt
		}
		else if(sw2 && tl==1)	// Button Reset pressed
		{
			lcd_gotoxy(1,9);	// Sending ready string to display
			lcd_putstr("--");
			tl=0;			// Double button tick elimination
			TCNT1 = 0;		// Reset Timer
			TIMSK1 = 0;		// Disable Compare A Interrupt
			seconds = 0;	// Reset seconds
			minutes = 0;	// Reset minutes
			sekundy();
		}
		else if(tl==1)		// If Start was pressed
		{
		sekundy();			// Calling seconds function
		minuty();			// Calling minutes function
		}
	}
}