Timer with Arduino

/*
 * Timer.c
 *
 * Created: 
 * Author : Marcazzan_M
 */ 


#include <avr/io.h>
#include <avr/interrupt.h>
#include "myFunction.h"

//PIN
#define D2 PORTD6		/*Pin of the transistor of tens*/
#define D1 PORTD5		/*Pin of the transistor of tens*/
#define U2 PORTD4		/*Pin of the transistor of tens of seconds*/
#define U1 PORTD3		/*Pin of the transistor of unit of seconds*/

#define BUZZER PORTC0	/*Pin of Buzzer*/

#define DISPLAY_SECONDS
#define DISPLAY_MINUTES

/*VARIABLES*/
uint16_t timer=0;				/*Global Time of the system res:0.01s*/
uint8_t sec=0,m=5;				/*Time in seconds, start point is 5 minutes*/
uint8_t copySec=0,copyM=0;		/*Copy value of sec and m before count*/
uint8_t time_multiplex=0;		/*Timer for multiplexing the display*/
uint8_t dec,uni;				/*Decomposition of the value to visualize*/
uint8_t enableCountdown=0x00;	/*Flag that enable the countdown*/
uint8_t enableBuzzer=0x00;		/*Flag that enable the Buzzer*/
uint8_t timeBuzzer=0x00;		/*Time for the frequency of buzzer*/

uint8_t minuti=5,secondi=0;	/*Time to count*/

uint8_t INT1_served=0x00;		/*Flag if 0x00 INT1 not served, 0xff INT1 served*/
uint8_t timeDelay_INT1=0x00;
uint8_t INT0_served=0x00;
uint8_t timeDelay_INT0=0x00;

void computeVal(uint8_t v);
void displayVal(uint8_t v);

int main(void)
{
	initIO();			/*Init IO ports*/
	Timer0Init_IT();	/*Init Timer*/
	enablePrescaler();	/*Launch the timer*/	
	ExtIntInit();		/*Init the external interrupt*/
	
    while (1) 
    {
    }
	
}

/*Compute tens and units of v*/
void computeVal(uint8_t v){
	/*Compute tens*/
	if(v > MAX_VAL) return;
	/*There are problems of rounding so I use also UN_DEC_1*/
	if(v==69 || v==79 || v==89 || v==99) dec=(v*UN_DEC_1)>>8;
	else dec=(v*UN_DEC)>>8;
	uni=v-(uint8_t)(dec*DEC);
	return;
}

/*Display the number at PORTB and PORTD*/
void displayVal(uint8_t v){
	if(v>0x09 || v<0) return;
	uint8_t tmp=disp[v];
	uint8_t tmp1=tmp & MSB7;
	PORTB=(tmp1>>1);
	tmp1=tmp & BIT0;
	if(tmp1>0)PORTD=PORTD|0b10000000;
	else PORTD=PORTD & 0b01111111;
	return;
}

/*Service for timer0*/
ISR(TIMER0_COMPA_vect)
{
	time_multiplex++;	
	timer++;
	
	//Re Ability of INT1
	if(INT1_served){
		timeDelay_INT1++;
		if(timeDelay_INT1>=150){
			 EIMSK|=(1<<INT1); /*Enable interrupt on INT1*/	
			 INT1_served=0x00;
		}
		
	}
	//#################
	
	//Re Ability of INT0
	if(INT0_served){
		timeDelay_INT0++;
		if(timeDelay_INT0>=150){
			 EIMSK|=(1<<INT0); /*Enable interrupt on INT0*/
			 INT0_served=0x00;
		}
		
	}
	//#################
	
	PORTC = PORTC & 0b11010000;			/*Disable all transistors*/
	
	/*This code make the sound with the buzzer*/
	if(enableBuzzer){
		timeBuzzer++;
		if(timeBuzzer>=50) PORTC=PORTC|0b00010000;
		if(timeBuzzer>=100){
			 PORTC=PORTC&0b11101111;
			 timeBuzzer=0;
		}	
	}
	//############################################
	
	/*Every 1 second*/
	if(timer==200)
	{
		timer=0;
		/*Countdown*/
		if(enableCountdown){
			if(sec>0){
				sec--;
			}
			else{
				if(m>0){
					m--;
					sec=59;
				}
			}
			
			if(sec==0 && m==0) {
				enableCountdown=0x00;							/*Disable the countdown*/
				if(copySec>0||copyM>0) enableBuzzer=0xff;		/*Enable the Buzzer*/
				timeBuzzer=0;
			}
		}
	}
	
	
	computeVal(sec);					/*Compute the 2 number to display*/
	/*Display seconds*/
	if(time_multiplex==1){				/*Display tens of seconds*/
		PORTC = PORTC | 0b00000010;		/*Enable PORTC1*/
		displayVal(dec);				/*Display val*/
	}
		
	if(time_multiplex==2){				/*Display units of seconds*/
		PORTC = PORTC | 0b00000001;		/*Enable PORTC0*/
		displayVal(uni);				/*Display val*/			
	}

	computeVal(m);
	/*Display minuets*/
	if(time_multiplex==3 && (uni>0 || dec>0)){			/*Display units of minutes*/
		PORTC = PORTC | 0b00100100;						/*Enable PORTC2*/
		displayVal(uni);								/*Display val*/
	}

	if(time_multiplex==4){					/*Display tens of minutes*/
		if(dec>0){
			PORTC = PORTC | 0b00001000;		/*Enable PORTC3*/
			displayVal(dec);				/*Display val*/
		}
		time_multiplex=0;
	}

}

/*Handler for the external interrupt on INT0*/
ISR(INT0_vect){
	EIMSK=EIMSK&0xfe;		/*Disable interrupt on INT0*/
	INT0_served=0xff;
	timeDelay_INT0=0;
	
	
	if(enableCountdown==0x00){
		m++;					/*Increases the minutes by one*/
	}
	
	
	
	if(enableBuzzer==0xff){
		m=copyM;				/*The initial value of minutes and seconds*/
		sec=copySec;
	}
	if(enableBuzzer==0x00 && enableCountdown==0xff){
		m=0;					/*Reset the countdown*/
		sec=0;
	}
	
	PORTC=PORTC&0b11101111;		/*Force the buzzer to stop*/
	
	enableCountdown=0x00;		/*pause for the countdown*/
	
	/*Disable the buzzer*/
	enableBuzzer=0x00;
}

/*Handler for the external interrupt on INT1*/
ISR(INT1_vect){
	EIMSK=EIMSK&0xb11111101;	/*Disable interrupt on INT1 in order to eliminate the ringing on the button*/
	INT1_served=0xff;
	timeDelay_INT1=0;
	
	enableCountdown=0xff;		/*Enable the countdown*/
	copyM=m;					/*Make a copy of the initial value*/
	copySec=sec;
	
}