void i2c_start();
void init_ports();
void Delay(int);
void initialise_rtc(char hours, char minutes, char seconds);
void i2c_write(char sa, char address, char data);
void i2c_send(char data);
int i2c_acknowledge();
typedef struct portF_bits{
  char SCL:1;
  char SDA:1;
}control;

void setup() {
  int acknowledgement;
  // initialising the ports 
  init_ports();
  // initialise rtc
  //initialise_rtc(0x00,0x00,0x00);
  // i2c_start();
  // i2c_send(0xD0);
  // acknowledgement = i2c_acknowledge();
  // Serial.begin(115200);
  // if(acknowledgement)
  //  Serial.println("get the acknowledgement");
  // else  
  //  Serial.println("not get acknowledgement");  
  i2c_start();
}
// initialising rtc
void initialise_rtc(char hours,char minutes,char seconds){
  char slave_address = 0xD0;
  //writing on seconds register 
  i2c_write(slave_address,0x00, 0x00);
  //writing on minutes register 
  //i2c_write(slave_address,0x01, 0x00);
  //writing on hours register  
  //i2c_write(slave_address,0x02, 0x00);
}
// write on an address using i2c
void i2c_write(char sa, char address, char data){
     int acknowledgement;
     i2c_start();
     i2c_send(sa);
     acknowledgement = i2c_acknowledge();
     Serial.begin(115200);
     if(acknowledgement)
      Serial.println("get acknowledgement");
      
}
// we get the acknowledgement using these function 
int i2c_acknowledge(){
     control *portF = 0x31;
     portF->SCL = 0;
     portF->SDA = 1;
     portF->SCL = 1;
     Delay(10);
     if(portF->SDA == 0)
       return 1;
     else
       return 0;  
}
// used to send 1 byte
void i2c_send(char data){
     control *portF = 0x31;
     char i;
     for(i=7;i>=0;--i){
        portF->SCL = 0; 
        portF->SDA = (data>>i)&1;
       // Delay(1000);
        portF->SCL = 1;
       // Delay(1000);
     }
}
//start i2c 
void i2c_start(){
  control *portF = 0x31;
  portF->SDA = 1;
  //Delay(1000);
  portF->SCL = 1;
  //Delay(1000);
  portF->SDA = 0;
  //Delay(1000);
}
//initialise ports
void init_ports(){
  volatile char *ddrF = 0x30;
  *ddrF|=0xC0;
}
//provides delay in seconds
void Delay(int milli_seconds){
  volatile long int i;
  while(milli_seconds--){
    for(i=0;i<500;++i);
  }
}
void loop() {
  // put your main code here, to run repeatedly:

}