/*
 * code_pcbGEN01.c
 *
 * Created: 15/02/2020 1:08:59 AM
 *  Author: Mahesh Nigam
 */ 

#define F_CPU 12000000UL //Setting F_CPU to the frequency of the microcontroller
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdio.h>
#include <avr/wdt.h>
#include <stdlib.h>
#include <string.h>
#include "drivers/16x2lcd/hd44780.h"

//FUNCTION DECLARATIONS
void button_tone_delay();
unsigned char READ_EEPROM(unsigned int uiAddress);

//dedicated variables
char str[20];

//START-project specific variables
char seven_segment_code[11]={0b11100111,0b00100001,0b11001011,0b01101011,0b00101101,0b01101110,0b11101110,0b00100011,0b11101111,0b01101111,0b00010000};
unsigned int buffer_num=0;
unsigned char digit_num1=0;
unsigned char digit_num2=0;
unsigned char digit_num3=0;
unsigned int life_value=0;
char start_test=0;
#define segment_port PORTD //declare this port as output anywhere
//END-project specific variables

//timer variables
unsigned int s=0;
unsigned int s_last=0;
unsigned int s_last_display=0;
unsigned char s_increment_status=0;
unsigned int ms1=0;
unsigned int common_ms1_timer=0;

char sms_sent=0;

//temp_variable
char temp_str[20]="000";
unsigned char char_temp=0;
unsigned int int_temp=0;

//eeprom address assignment
//#define xxxxxxx 0x4001

//output defines start
#define output_port2 PORTB
#define output_ddr2 DDRB
#define sel_digit1 0
#define sel_digit2 1
#define sel_digit3 2
#define buzzer 3

//output defines start
#define output_port4 PORTD
#define output_ddr4 DDRD

void init_outputs()
{
    output_ddr2 |= ((1<<sel_digit1) | (1<<sel_digit2) | (1<<sel_digit3) | (1<<buzzer));
    output_port2 &= ~((1<<sel_digit1) | (1<<sel_digit2) | (1<<sel_digit3) | (1<<buzzer));    //initial value as '0's
        
    output_ddr4 = 0xff;    //all as output
    output_port4 = 0x0;    //initial value as '0's
}
//output defines end

//START- system time generator
void init_timer0(){                    //initialize timer0
    TIMSK |= (1<<TOIE0);            //ENABLE TIMER0
    TCCR0 = (0x03);                    //PRESCALER=1:64
    TCNT0 = 70;                        // 1ms timer value
    sei();                            // Interrupt Enabled GLOBALLY
}

ISR(TIMER0_OVF_vect) {
    unsigned char sreg = SREG;
    cli();                // Disable Global interrupt
    TCNT0 = 70;         // 1ms timer value
    
    //main system time controlling
    ms1++;
    common_ms1_timer++;
    
    //START-updating seven segment
    if((buffer_num>999) || (buffer_num<0)){buffer_num=0;}
    if(ms1%3==0){
        output_port2 &=~((1<<sel_digit1) | (1<<sel_digit2) | (1<<sel_digit3));
        output_port2 |= ((1<<sel_digit1));
        digit_num1=(buffer_num%100)%10;
        segment_port = ~seven_segment_code[digit_num1];
    }
    
    if(ms1%3==1){
        output_port2 &=~((1<<sel_digit1) | (1<<sel_digit2) | (1<<sel_digit3));
        output_port2 |= ((1<<sel_digit2));
        digit_num2=(buffer_num%100)/10;
        segment_port = ~seven_segment_code[digit_num2];
    }

    if(ms1%3==2){
        output_port2 &=~((1<<sel_digit1) | (1<<sel_digit2) | (1<<sel_digit3));
        output_port2 |= ((1<<sel_digit3));
        digit_num3=(buffer_num/100);
        segment_port = ~seven_segment_code[digit_num3];
    }
    //END-updating seven segment
    
    
    
    if(ms1>1000){ms1=0;
        if(s_increment_status==0){
            s_increment_status=1;
            s++;
            //timeout

        }
    }
    else{s_increment_status=0;}

    SREG = sreg;
}
//END- system time generator

int main(void){
//init_sensor();
init_outputs();
init_timer0();
buffer_num=0;
while(1){

buffer_num++;

_delay_ms(1000);

}
}