#define ADDR_DS3231   0b1101000
#define CPU_F         12000000 // Clock Speed 
#define SCL_F         100000 // // I2C Speed
#define TEMP_CALL     -200   // 2 ГРАДУСА

unsigned long times_sec,millis_time;
int i,segm,times,hh,mm;
byte a[4],an,sec,min,hour,set;

void setup() {
  TWBR = (((CPU_F)/(SCL_F)-16 )/2) ;
  TWSR = 0;
  DDRB &=~(1 << PB0);DDRD &=~(1<<PD6)|(1<<PD7);
  DDRB |= (1 << PB1);// pin 15 output pwm
  DDRB |= (1 << PB2);// pin 16 output second in-3
  DDRC |= (1 << PC0)|(1 << PC1)|(1 << PC2)|(1 << PC3);// H0-H3 ANOD
  DDRD |= (1 << PD0)|(1 << PD1)|(1 << PD2)|(1 << PD3);// 1 2 4 8 K155ID1
  PORTB |= (1 << PB0);PORTD |= (1 << PD6)|(1 << PD7);
// F=12000000/512/1/1=23437.5 Hz
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1 = 0;
  TCCR1A |= (1<<COM1A1);
  TCCR1B |= (1<<WGM12);
  TCCR1A |= (1<<WGM11);
  TCCR1B |= (1 << CS10); 
  ICR1 = 511; 
  OCR1A = 506; //  Ureg_180V 
// (12000000/((233+1)x256))=200.32051282051 Hz
  OCR2 = 233;
  TCCR2 |= (1 << WGM21); 
  TCCR2 |= (1 << CS22) | (1 << CS21);
  TIMSK |= (1 << OCIE2);
// set time
 //  set_time(21,1,12,26,8,9,0);// год 00-99, ДН 1-7 (1=ВС), месяц 1-12, дата 1-31, час 0-23, минуты 0-59, секунды 0-59  
}


void loop(){
/// read time  
   sec =  (i2c_read_1bit(ADDR_DS3231,0) & 0x0F) + (((i2c_read_1bit(ADDR_DS3231,0) & 0x70) >> 4) * 10);
   min =  (i2c_read_1bit(ADDR_DS3231,1) & 0x0F) + (((i2c_read_1bit(ADDR_DS3231,1) & 0x70) >> 4) * 10);
   hour = ((i2c_read_1bit(ADDR_DS3231,2) & 0x0F) + ((i2c_read_1bit(ADDR_DS3231,2) & 0x70) >> 4) * 10);
   int temper = (i2c_read_1bit(ADDR_DS3231,0x11)*100 + ((i2c_read_1bit(ADDR_DS3231,0x12) & 0b11000000) >> 6)*25)+TEMP_CALL;  

/// set time
  hh=hour;mm=min;
  if(((PINB >> PB0) & 1) == 0){set++;if(set>2){set=0;}_delay_ms(200);}  
   if(set==1&&((PIND >> PD6)&1)==0){hh++;if(hh>23){hh=23;}set_time(21,1,12,26,hh,mm,0);_delay_ms(100);}
   if(set==1&&((PIND >> PD7)&1)==0){hh--;if(hh<0){hh=0;}set_time(21,1,12,26,hh,mm,0);_delay_ms(100);}
   if(set==2&&((PIND >> PD6)&1)==0){mm++;if(mm>59){mm=59;}set_time(21,1,12,26,hh,mm,0);_delay_ms(100);}
   if(set==2&&((PIND >> PD7)&1)==0){mm--;if(mm<0){mm=0;}set_time(21,1,12,26,hh,mm,0);_delay_ms(100);}

/// output sec in-3  
  if(millis_time-times_sec<100){PORTB |= (1 << PB2);}
  if(millis_time-times_sec>=100){PORTB &=~(1 << PB2);}
  if(millis_time-times_sec>200){times_sec=millis_time;}

  times = hour*100+min;
  if(set==0&&((PIND >> PD7)&1)==0){times = temper;PORTB |= (1 << PB2);}
  if(set==0&&((PIND >> PD6)&1)==0){times = temper;PORTB |= (1 << PB2);}

  if(min == 30 && sec < 10 && set == 0){
    switch(sec){
      case 0: times=0;break;
      case 1: times=1111;break;
      case 2: times=2222;break;
      case 3: times=3333;break;
      case 4: times=4444;break;
      case 5: times=5555;break;
      case 6: times=6666;break;
      case 7: times=7777;break;
      case 8: times=8888;break;
      case 9: times=9999;break;
      }
    }
  
  a[0]=times/1000%10;
  a[1]=times/100%10;
  a[2]=times/10%10;
  a[3]=times%10;
  
//_delay_ms(50);
}

void segment(){
  switch(segm){                                                                 
    case 0: PORTD &= ~(1 << PD3);PORTD &=~ (1 << PD2);PORTD &= ~(1 << PD1);PORTD &= ~(1 << PD0);break;     // DEC 0 = 0b0000
    case 1: PORTD &= ~(1 << PD3);PORTD &=~ (1 << PD2);PORTD &= ~(1 << PD1);PORTD |=(1 << PD0); break;    // DEC 1 = 0b0001
    case 2: PORTD &= ~(1 << PD3);PORTD &=~ (1 << PD2);PORTD |= (1 << PD1);PORTD &= ~(1 << PD0);break;    // DEC 2 = 0b0010
    case 3: PORTD &= ~(1 << PD3);PORTD &=~ (1 << PD2);PORTD |= (1 << PD1);PORTD |= (1 << PD0);break;   // DEC 3 = 0b0011
    case 4: PORTD &= ~(1 << PD3);PORTD |= (1 << PD2);PORTD &= ~(1 << PD1);PORTD &= ~(1 << PD0);break;    // DEC 4 = 0b0100
    case 5: PORTD &= ~(1 << PD3);PORTD |= (1 << PD2);PORTD &= ~(1 << PD1);PORTD |= (1 << PD0);break;   // DEC 5 = 0b0101
    case 6: PORTD &= ~(1 << PD3);PORTD |= (1 << PD2);PORTD |= (1 << PD1);PORTD &= ~(1 << PD0);break;   // DEC 6 = 0b0110
    case 7: PORTD &= ~(1 << PD3);PORTD |= (1 << PD2);PORTD |= (1 << PD1);PORTD |= (1 << PD0);break;  // DEC 7 = 0b0111
    case 8: PORTD |= (1 << PD3);PORTD &=~ (1 << PD2);PORTD &= ~(1 << PD1);PORTD &= ~(1 << PD0);break;    // DEC 8 = 0b1000
    case 9: PORTD |= (1 << PD3);PORTD &=~ (1 << PD2);PORTD &= ~(1 << PD1);PORTD |= (1 << PD0);break;   // DEC 9 = 0b1001
  }}

void anod(){
  switch(an){                                                             
    case 0: PORTC |= (1 << PC0);PORTC &= ~(1 << PC1);PORTC &= ~(1 << PC2);PORTC &= ~(1 << PC3);break;    
    case 1: PORTC &= ~(1 << PC0);PORTC |= (1 << PC1);PORTC &= ~(1 << PC2);PORTC &= ~(1 << PC3);break;   
    case 2: PORTC &= ~(1 << PC0);PORTC &= ~(1 << PC1);PORTC |= (1 << PC2);PORTC &= ~(1 << PC3);break;   
    case 3: PORTC &= ~(1 << PC0);PORTC &= ~(1 << PC1);PORTC &= ~(1 << PC2);PORTC |= (1 << PC3);break;   
  }}

void cl(){PORTC &= ~(1 << PC0);PORTC &= ~(1 << PC1);PORTC &= ~(1 << PC2);PORTC &= ~(1 << PC3);}  

ISR(TIMER2_COMP_vect){
  switch(i){
    case 0: segm=a[0]; an=0; cl(); if(set==2){_delay_ms(5);}_delay_ms(1); segment();anod();break;
    case 1: segm=a[1]; an=1; cl(); if(set==2){_delay_ms(5);}_delay_ms(1); segment();anod();break;
    case 2: segm=a[2]; an=2; cl(); if(set==1){_delay_ms(5);}_delay_ms(1); segment();anod();break;
    case 3: segm=a[3]; an=3; cl(); if(set==1){_delay_ms(5);}_delay_ms(1); segment();anod();break;
    }
    i++;if(i>3){i=0;}
    millis_time++;
  }

int i2c_read_i2c_2bit(byte i2c_addr, byte i2c_reg){
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_addr << 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_reg;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
 
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT))); 
   TWDR = (i2c_addr << 1) | 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
 
   TWCR=(1<<TWINT)|(1<<TWEN)|(1<<TWEA); 
  while(~TWCR&(1<<TWINT));
   int i2c_data0 = TWDR; 
 
   TWCR = (1<<TWINT) | (1<<TWEN);
  while(~TWCR&(1<<TWINT));
  int i2c_data1 = TWDR; 
 
   TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); // СТОП
  int i2c_data = (i2c_data0<<8)+i2c_data1;
  return i2c_data;
  }  

int i2c_read_1bit(byte i2c_addr, byte i2c_reg){
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_addr << 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_reg;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
 
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT))); 
   TWDR = (i2c_addr << 1) | 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
 
   TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWEA); 
  while(~TWCR&(1<<TWINT));
    byte i2c_data = TWDR; 
  TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
 
   TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); // СТОП
  return i2c_data;
  }   

 void i2c_write(byte i2c_addr, byte i2c_reg, byte i2c_dat){
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_addr << 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_reg;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_dat;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); // СТОП
  } 

 void i2c_write_1bit(byte i2c_addr, byte i2c_reg){
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_addr << 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_reg;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); // СТОП
  }   

void set_time(byte years, byte days, byte monts, byte datas, byte hours ,byte minute, byte second){
    if(second < 255){i2c_write(ADDR_DS3231,0x00,(second/10<<4)+second%10);}
    if(minute < 255){i2c_write(ADDR_DS3231,0x01,(minute/10<<4)+minute%10);} 
    if(hours < 255){i2c_write(ADDR_DS3231,0x02,(hours/10<<4)+hours%10);}
    if(days < 255){i2c_write(ADDR_DS3231,0x03,days);}
    if(datas < 255){i2c_write(ADDR_DS3231,0x04,(datas/10<<4)+datas%10);}
    if(monts < 255){i2c_write(ADDR_DS3231,0x05,(monts/10<<4)+monts%10);}
    if(years < 255){i2c_write(ADDR_DS3231,0x06,(years/10<<4)+years%10);}
  }      

#define ADDR_DS3231   0b1101000
#define CPU_F         12000000 // Clock Speed 
#define SCL_F         100000 // // I2C Speed


unsigned long times_sec,millis_time;
int i,segm,times,hh,mm;
byte a[4],an,sec,min,hour,set;

void setup() {
  TWBR = (((CPU_F)/(SCL_F)-16 )/2) ;
  TWSR = 0;
  DDRB &=~(1 << PB0);DDRD &=~(1<<PD6)|(1<<PD7);
  DDRB |= (1 << PB1);// pin 15 output pwm
  DDRB |= (1 << PB2);// pin 16 output second in-3
  DDRC |= (1 << PC0)|(1 << PC1)|(1 << PC2)|(1 << PC3);// H0-H3 ANOD
  DDRD |= (1 << PD0)|(1 << PD1)|(1 << PD2)|(1 << PD3);// 1 2 4 8 K155ID1
  PORTB |= (1 << PB0);PORTD |= (1 << PD6)|(1 << PD7);
// F=12000000/512/1/1=23437.5 Hz
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1 = 0;
  TCCR1A |= (1<<COM1A1);
  TCCR1B |= (1<<WGM12);
  TCCR1A |= (1<<WGM11);
  TCCR1B |= (1 << CS10); 
  ICR1 = 511; 
  OCR1A = 505; //  Ureg_180V 
// (12000000/((233+1)x256))=200.32051282051 Hz
  OCR2 = 233;
  TCCR2 |= (1 << WGM21); 
  TCCR2 |= (1 << CS22) | (1 << CS21);
  TIMSK |= (1 << OCIE2);
// set time
 //  set_time(21,1,12,26,8,9,0);// год 00-99, ДН 1-7 (1=ВС), месяц 1-12, дата 1-31, час 0-23, минуты 0-59, секунды 0-59  
}


void loop(){
/// read time  
   sec =  (i2c_read_1bit(ADDR_DS3231,0) & 0x0F) + (((i2c_read_1bit(ADDR_DS3231,0) & 0x70) >> 4) * 10);
   min =  (i2c_read_1bit(ADDR_DS3231,1) & 0x0F) + (((i2c_read_1bit(ADDR_DS3231,1) & 0x70) >> 4) * 10);
   hour = ((i2c_read_1bit(ADDR_DS3231,2) & 0x0F) + ((i2c_read_1bit(ADDR_DS3231,2) & 0x70) >> 4) * 10);
// temper = (i2c_read_1bit(ADDR_DS3231,0x11)*100 + ((i2c_read_1bit(ADDR_DS3231,0x12) & 0b11000000) >> 6)*25) ;  

/// set time
  hh=hour;mm=min;
  if(((PINB >> PB0) & 1) == 0){set++;if(set>2){set=0;}_delay_ms(200);}  
   if(set==1&&((PIND >> PD6)&1)==0){hh++;if(hh>23){hh=23;}set_time(21,1,12,26,hh,mm,0);_delay_ms(100);}
   if(set==1&&((PIND >> PD7)&1)==0){hh--;if(hh<0){hh=0;}set_time(21,1,12,26,hh,mm,0);_delay_ms(100);}
   if(set==2&&((PIND >> PD6)&1)==0){mm++;if(mm>59){mm=59;}set_time(21,1,12,26,hh,mm,0);_delay_ms(100);}
   if(set==2&&((PIND >> PD7)&1)==0){mm--;if(mm<0){mm=0;}set_time(21,1,12,26,hh,mm,0);_delay_ms(100);}

/// output sec in-3  
  if(millis_time-times_sec<100){PORTB |= (1 << PB2);}
  if(millis_time-times_sec>=100){PORTB &=~(1 << PB2);}
  if(millis_time-times_sec>200){times_sec=millis_time;}

  times = hour*100+min;

  if(min == 30 && sec < 10 && set == 0){
    switch(sec){
      case 0: times=0;break;
      case 1: times=1111;break;
      case 2: times=2222;break;
      case 3: times=3333;break;
      case 4: times=4444;break;
      case 5: times=5555;break;
      case 6: times=6666;break;
      case 7: times=7777;break;
      case 8: times=8888;break;
      case 9: times=9999;break;
      }
    }
  
  a[0]=times/1000%10;
  a[1]=times/100%10;
  a[2]=times/10%10;
  a[3]=times%10;
  
//_delay_ms(50);
}

void segment(){
  switch(segm){                                                                 
    case 0: PORTD &= ~(1 << PD3);PORTD &=~ (1 << PD2);PORTD &= ~(1 << PD1);PORTD &= ~(1 << PD0);break;     // DEC 0 = 0b0000
    case 1: PORTD &= ~(1 << PD3);PORTD &=~ (1 << PD2);PORTD &= ~(1 << PD1);PORTD |=(1 << PD0); break;    // DEC 1 = 0b0001
    case 2: PORTD &= ~(1 << PD3);PORTD &=~ (1 << PD2);PORTD |= (1 << PD1);PORTD &= ~(1 << PD0);break;    // DEC 2 = 0b0010
    case 3: PORTD &= ~(1 << PD3);PORTD &=~ (1 << PD2);PORTD |= (1 << PD1);PORTD |= (1 << PD0);break;   // DEC 3 = 0b0011
    case 4: PORTD &= ~(1 << PD3);PORTD |= (1 << PD2);PORTD &= ~(1 << PD1);PORTD &= ~(1 << PD0);break;    // DEC 4 = 0b0100
    case 5: PORTD &= ~(1 << PD3);PORTD |= (1 << PD2);PORTD &= ~(1 << PD1);PORTD |= (1 << PD0);break;   // DEC 5 = 0b0101
    case 6: PORTD &= ~(1 << PD3);PORTD |= (1 << PD2);PORTD |= (1 << PD1);PORTD &= ~(1 << PD0);break;   // DEC 6 = 0b0110
    case 7: PORTD &= ~(1 << PD3);PORTD |= (1 << PD2);PORTD |= (1 << PD1);PORTD |= (1 << PD0);break;  // DEC 7 = 0b0111
    case 8: PORTD |= (1 << PD3);PORTD &=~ (1 << PD2);PORTD &= ~(1 << PD1);PORTD &= ~(1 << PD0);break;    // DEC 8 = 0b1000
    case 9: PORTD |= (1 << PD3);PORTD &=~ (1 << PD2);PORTD &= ~(1 << PD1);PORTD |= (1 << PD0);break;   // DEC 9 = 0b1001
  }}

void anod(){
  switch(an){                                                             
    case 0: PORTC |= (1 << PC0);PORTC &= ~(1 << PC1);PORTC &= ~(1 << PC2);PORTC &= ~(1 << PC3);break;    
    case 1: PORTC &= ~(1 << PC0);PORTC |= (1 << PC1);PORTC &= ~(1 << PC2);PORTC &= ~(1 << PC3);break;   
    case 2: PORTC &= ~(1 << PC0);PORTC &= ~(1 << PC1);PORTC |= (1 << PC2);PORTC &= ~(1 << PC3);break;   
    case 3: PORTC &= ~(1 << PC0);PORTC &= ~(1 << PC1);PORTC &= ~(1 << PC2);PORTC |= (1 << PC3);break;   
  }}

void cl(){PORTC &= ~(1 << PC0);PORTC &= ~(1 << PC1);PORTC &= ~(1 << PC2);PORTC &= ~(1 << PC3);}  

ISR(TIMER2_COMP_vect){
  switch(i){
    case 0: segm=a[0]; an=0; cl(); if(set==2){_delay_ms(5);}_delay_ms(1); segment();anod();break;
    case 1: segm=a[1]; an=1; cl(); if(set==2){_delay_ms(5);}_delay_ms(1); segment();anod();break;
    case 2: segm=a[2]; an=2; cl(); if(set==1){_delay_ms(5);}_delay_ms(1); segment();anod();break;
    case 3: segm=a[3]; an=3; cl(); if(set==1){_delay_ms(5);}_delay_ms(1); segment();anod();break;
    }
    i++;if(i>3){i=0;}
    millis_time++;
  }

int i2c_read_i2c_2bit(byte i2c_addr, byte i2c_reg){
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_addr << 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_reg;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
 
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT))); 
   TWDR = (i2c_addr << 1) | 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
 
   TWCR=(1<<TWINT)|(1<<TWEN)|(1<<TWEA); 
  while(~TWCR&(1<<TWINT));
   int i2c_data0 = TWDR; 
 
   TWCR = (1<<TWINT) | (1<<TWEN);
  while(~TWCR&(1<<TWINT));
  int i2c_data1 = TWDR; 
 
   TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); // СТОП
  int i2c_data = (i2c_data0<<8)+i2c_data1;
  return i2c_data;
  }  

int i2c_read_1bit(byte i2c_addr, byte i2c_reg){
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_addr << 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_reg;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
 
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT))); 
   TWDR = (i2c_addr << 1) | 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
 
   TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWEA); 
  while(~TWCR&(1<<TWINT));
    byte i2c_data = TWDR; 
  TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
 
   TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); // СТОП
  return i2c_data;
  }   

 void i2c_write(byte i2c_addr, byte i2c_reg, byte i2c_dat){
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_addr << 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_reg;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_dat;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); // СТОП
  } 

 void i2c_write_1bit(byte i2c_addr, byte i2c_reg){
   TWCR = (1<<TWINT)|(1<<TWSTA)|(1<<TWEN);  // START
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_addr << 1;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWDR = i2c_reg;
   TWCR = (1<<TWINT) | (1<<TWEN);
  while (!(TWCR & (1<<TWINT)));
   TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO); // СТОП
  }   

void set_time(byte years, byte days, byte monts, byte datas, byte hours ,byte minute, byte second){
    if(second < 255){i2c_write(ADDR_DS3231,0x00,(second/10<<4)+second%10);}
    if(minute < 255){i2c_write(ADDR_DS3231,0x01,(minute/10<<4)+minute%10);} 
    if(hours < 255){i2c_write(ADDR_DS3231,0x02,(hours/10<<4)+hours%10);}
    if(days < 255){i2c_write(ADDR_DS3231,0x03,days);}
    if(datas < 255){i2c_write(ADDR_DS3231,0x04,(datas/10<<4)+datas%10);}
    if(monts < 255){i2c_write(ADDR_DS3231,0x05,(monts/10<<4)+monts%10);}
    if(years < 255){i2c_write(ADDR_DS3231,0x06,(years/10<<4)+years%10);}
  }